Keeprite KDX, KDX104 User Manual
PRODUCT DATA &
SPECIFICATIONS
Bulletin K70-KDX-PDS-11
1064639
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Type KDX
Direct Expansion
Coils
For Cooling & Dehumidifying
Refrigerants R22, R404A & R134a
KeepRite
Coil T ype (Direct Expansion)
Fin Series (70, 80, 100 or 120)
NOMENCLATURE
K DX 10 4 - 30 X 72 R-22
Refrigerant Type
(R-22 or R404A)
Nominal Tube Length
“W” Dimension
Rows Deep
DIRECT EXPANSION COILS
TYPE KDX
SIZES AND MODELS FOR EVERY APPLICATION
Direct Expansion Type KDX Coils are engineered and
designed to deliver the maximum possible heat transfer
efficiency under all operating conditions. KeepRite coils
are manufactured using only the highest quality materials
and with the most modern manufacturing facilities
available. Each KeepRite Coil is inspected and tested
under rigid quality control standards to offer you the finest
quality Coil designed for long life and top performance.
A variety of fin selections make it possible to meet the
sensible and total requirements more accurately and
economically.
Select standard KeepRite Direct Expansion Coils
from any combination of the following:
1. Series70, 80, 100 and 12O Fin spacings.
2. From 2 through 10 rows deep
3. From 6" through 36" high face (3" increments).
4. From 6" through 120" nominal tube length.
5. Coils for R-22 and R-404A.
RIPPLE FIN CONSTRUCTION
All KeepRite Coils feature the Ripple Fin Coil
Construction to provide a more efficient transfer surface
of superior strength and durability. Rippled Aluminum
fins produce a rippled air flow pattern throughout the coil
creating the maximum air turbulence necessary for
efficient heat transfer. Copper tubing is mechanically
expanded into the Rippled Aluminum fins, making
positive, permanent metal to metal contact for durability
STAGGERED TUBE DESIGN
and peak efficiency. Wide, full fin collars drawn in the fin
stock not only provide accurate control of the fin spacing,
but also completely cover the tube for the greatest heat
transfer efficiency and coil protection.
Another important feature of KeepRite Coils is the
Staggered Tube design which offers an intimate and
prolonged contact of the air and cooling surface.
- 2 -
TABLE OF CONTENTS
SIZES AND MODELS............................................................2
Coil nomenclature .............................................................. 2
FEATURES ...........................................................................3
COOL SPECIFICATIONS .....................................................4
GENERAL FORMULAS.........................................................4
COIL SELECTION
Wet bulb depression factor ............................................... 5
General considerations ..................................................... 5
Coil sizes, Table 1 ............................................................. 6
DEHUMIDIFYING COIL SELECTION
Example problem No. 1 ..................................................... 7
Example problem No. 2 ..................................................... 8
Example problem No. 3 ..................................................... 9
TOTAL HEAT, Table 2.........................................................10
CONVERSION FACTORS - AIR VOLUME
Temperature, Figure 1....................................................11
Altitude, Figure 2.............................................................11
DIRECT EXPANSION COIL RATINGS
For R-12, Table 3...................................................12 to 20
For R-22, Table 4...................................................21 to 29
DEHUMIDIFYING COIL
Basic rating curves for R-12, Figure 3............................30
Velocity and row correction factors for R-12, Figure 4...30
Fin series total capacity correction factors, Table 5.......30
Basic rating curves for R-22, Figure 5............................31
Velocity and row correction factors for R-22, Figure 6...31
Fin series total capacity correction factors, Table 6.......31
Wet bulb depression factors, Figure 7...........................32
SENSIBLE COOLING COIL SELECTION
Example problem No. 4...................................................33
SENSIBLE COOLING COIL
Basic rating curves for R-12, Figure 8............................34
Velocity and row correction factors for R-12, Figure 9...34
Fin series sensible total capacity correction factors,
Table 7..........................................................................34
Basic rating curves for R-22, Figure 10..........................35
Velocity and row correction factors for R-22, Figure 11..35
Fin series sensible capacity correction factors, Table 8.35
COIL AIR FRICTION
Dry coils, Figure 12.........................................................36
Air friction factor..............................................................36
Air friction. correction factors, Table 9.............................36
CAPACITY REDUCTION APPLICATIONS ........................36
COIL DIMENSIONS..............................................................37
TYPICAL SPECIFICATION..................................................38
“TYPE KDX COIL” OFFERS THESE
FEATURES
STAGGERED TUBES
Experience and KeepRite tests prove conclusively that
staggered tubes produce at least 5% higher capacity than
parallel tubes.
RIPPLED FINS
Experience and KeepRite tests prove conclusively that
KeepRite fins which ripple through fin depth produce a
minimum of 5% higher performance than flat plate fins.
HIGHER HEAT TRANSFER RATE
New KeepRite combination of staggered tubes and modified
rippled fins, produces the necessary turbulence to interrupt the
insulating boundary layer film, while retaining the intimate and
prolonged contact between air and the heat exchanger surface.
NON FERROUS HEADERS
Heavy wall seamless copper headers and copper tubes
eliminate leaks which could occur from unequal expansion rates
of dissimilar materials as well as from the possibility of galvanic
corrosion. Natural resistance of copper to corrosion means longer
coil life.
FLOW CIRCUITING
All coils are counterflow circuited and equipped with pressure
type distributors to insure equal distribution of refrigerant to each
circuit. Sufficient circuits are provided to insure equal,
distribution of refrigerant to each circuit. Circuiting for facecontrol and row-control is also available.
FULL FIN COLLARS
Wide, smooth die-formed fin collars provide accurate fin spacing
and completely cover the coil tube for maximum contact area
and highest heat transfer.
FULL FACE HEIGHT-Without Air By-Pass
POSITIVE PERMANENT TUBE FIN BOND
Mechanical pressure expansion of the tube into the fin provides
a positive and permanent metal to metal contact for durability
and peak performance.
UNMATCHED VARIETY OF STANDARD COILS
Provides practically unlimited flexibility in selection of coils to
more accurately meet load requirements.
- 3 -
COIL SPECIFICATIONS
PRIMARY SURFACE
5/8" round seamless copper tubes are mechanically
expanded, offering positive, permanent, metal to metal
contact for efficient heat transfer.
SECONDARY SURFACE
Rippled, plate type aluminum fins create the maximum air
turbulence necessary to obtain efficient transfer of heat.
Wide, full, fin collars, smoothly drawn completely cover the
tubes increasing the contact area.
OPERATING CONDITIONS
Complete core rated at 200 psig working pressure.
CIRCUITING
Each Direct Expansion Coil is circuited for low pressure
drop with sufficient vapor velocity to insure maximum heat
transfer. All circuits are of equal length and all carry equal
loads.
CASING
Die formed heavy gauge casings are formed from
Continuous Galvanized Steel. Three eighths inch bolt
holes on 3” centers are provided in mounting frames.
TESTS
Complete Coil assembly is tested at 315 psig air under
warm water. Dehydrated by heating and circulating hot
dry air (-40°F, dew-point) throughout the coil and then
sealed.
SPECIAL REFRIGERANTS
For use with special refrigerants consult the factory.
SPECIAL PURPOSE COILS
Protective coatings, special materials, and fin spacings
to meet your individual needs are available for industrial
and process applications
BRAZING
All Core joints are made with copper brazing alloys.
RETURN BENDS
5/8” O.D. round seamless copper tubing.
HEADER END CAPS
Heavy gauge copper.
LIQUID DISTRIBUTORS
Pressure type brass distributors with accurately spaced
drilled outlets are furnished and mounted on each coil to
insure equal distribution of refrigerant to all circuits.
Expansion valve may be field installed and coil can be
mounted in any position.
CONNECTIONS
Male Sweat type. Liquid connections are brass and
suction connections are copper.
CERTIFIED DRAWINGS WILL BE FURNISHED ON REQUEST
GENERAL FORMULAS
1. TOTAL BTUH
Total Btuh = 4.5 X (total heat ent air total heat lvg air)
Where: 4.5 = (density std air) X (min
.075 = density std air in lbs/cu ft
60 = min/ hr
2. SENSIBLE BTUH
Sensible Btuh = 1.09 X cfm X (ent air dry bulb - lvg air
dry bulb)
Where: 1.09 = (sp ht air at 70 F) X (min/hr) X
(density std air)
.24 = sp ht air at 70 F
60 = min/hr
.075 = density std air in lbs/cu ft
3. LEAVIND AIR DRY BULB TEMPERATURE
a. Lvg air dry bulb = ent air dry bulb -
1.09 X cfm
b. Lvg air dry bulb = lvg air wet bulb + (wet bulb depression
factor) X (initial wet bulb depression)
sensible Btuh
4. FACE AREA SQ. FT.
5. FACE VELOCITY F.P.M.
6 . SENSIBLE TOTAL RATIO
7. TONS PER SQUARE FOOT OF FACE AREA
8. INITIAL WET BULB DEPRESSION
Initial wet bulb depression = (ent air dry bulb) (ent air wet bulb)
cfm
FA =
face velocity (fpm)
cfm
FV =
face area (sq ft)
S/T ratio =
total Btuh
Tons/sq ft =
sensible Btuh
total Btuh
face area (sq ft) X 12,000
- 4 -
COIL SELECTION
WET BULB DEPRESSION FACTOR
Since both sensible and latent heat transfer, are
occurring simultaneously between the surface of a
dehumidifying coil and the air passing over it, some coil
performance factor which establishes the relationship
between these two modes of heat transfer is required.
For this purpose KeepRite employs the wet bulb
depression factor which has the general acceptance of
the finned tube coil industry.
The wet bulb depression factor is the ratio of the
leaving air to entering air wet bulb depressions and is
expressed as follows:
Wet Bulb Depression
Factor (WBDF) =
Entering Wet Bulb Depression
= Lvg. Air D.B. - Lvg. Air W.B. Temp.
Lvg. Air D.B. - Ent. Air W.B. Temp.
For the example illustrated below, the Wet Bulb
Depression Factor is:
WBDF =
61°F - 58°F 3
80°F - 67°F = 13
Leaving Wet - Bulb Depression
= .231
laboratory tests of each particular coil surface design. The
wet bulb depression factor does not apply to dry surface
cooling coils and is recommended for application only where
the sensible to total heat ratio is 0.9 or less. When the
sensible to total ratio is greater than 0.9, the fin surface is
essentially dry and the coil selection can be based on dry
surface to handle the total load.
Curves giving the wet bulb depression factor for
KeepRite Type KDX Coils are shown on page 33.
SATURATION CURVE
ENTERING
67°F WET BULB
TEMP.
LEAVING
58°F WET BULB
TEMP.
LEAVING
DEPRESSION
W.B.
AIR CONDITION
LEAVING COIL
AIR CONDITION
ENTERING COIL
ENTERING W.B.
DEPRESSION
Since the wet bulb depression factor describes a heat
transfer relationship on the fin side of a coil only, it varies
with the air side heat transfer performance, the amount
of heat transfer surface and with the air velocity.
The WB depression factor is determined by
GENERAL CONSIDERATIONS IN COIL SELECTION
The cooling process should always be plotted on a
psychrometric chart to be sure that the desired
psychrometric changes are feasible.
When selecting a coil it should be remembered that if the
required leaving wet bulb temperature is met, the total
load is satisfied and vice versa. Also, that when the,
required leaving Dry Bulb temperature is met, the
sensible load requirement is satisfied.
A coil must meet both the total load and the sensible
load requirement in order to achieve the conditions
desired in the space to be cooled. Normally the total
load capacity is checked first, however, the leaving dry
bulb should always be checked. When the sensible/
total ratio is low, the coil selection is normally controlled
by the total load even though the sensible cooling may
exceed the requirement. In some cases if the leaving
dry bulb temperature is too low, reheat may be required.
58 61 67 80
When the S/T ratio is high the coil selection is normally
controlled by the sensible cooling even though the total
load may exceed that required by an appreciable amount.
If the total capacity far exceeds the requirement, a recheck
on the refrigeration system balance should be made to be
sure sufficient system capacity is available.
MATCHING SENSIBLE-LATENT REQUIREMENTS - In
order to more accurately meet the sensible loads and the
total loads. The 70 and 80 fin series coils are
recommended for the lower S/T ratios, and the 100 and
120 fin series for the higher S/T ratios. For normal S/T
ratios fin series 80 and 100 are recommended.
When the refrigerant temperature is low and possible
frosting on the coil, surfaces may occur, fin series 70 is
recommended.
For selecting coils for sensible cooling only (dry coil) see
page 33.
- 5 -
COIL SELECTION
COIL SIZES
TABLE 1 - COIL SIZES - NOMINAL FACE AREA IN SQ. FT.
"W" NOMINAL TUBE LENGTH - NTL - (INCHES)
INCHES 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78
6 .50 .62 .75 .87 1.00 1.13 1.25 1.38 1.50 1.63 1.75 1.88 2.0 2.1 2.2 2.4 2.5 2.6 2.7 2.9 3.0
9 .75 .94 1.12 1.31 1.50 1.69 1.87 2.06 2.25 2.44 2.62 2.81 3.0 3.2 3.4 3.6 3.7 3.9 4.1 4.3 4.5
12 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.0 4.3 4.5 4.8 5.0 5.3 5.5 5.8 6.0 6.3 6.5
15 1.56 1.87 2.19 2.50 2.81 3.12 3.44 3.75 4.06 4.37 4.68 5.0 5.3 5.6 5.9 6.2 6.6 6.9 7.2 7.5 7.8 8.1
18 2.25 2.62 3.00 3.37 3.75 4.12 4.50 4.87 5.25 5.62 6.0 6.4 6.7 7.1 7.5 7.9 8.2 8.6 9.0 9.4 9.7
21 3.06 3.50 3.94 4.37 4.82 5.25 5.69 6.12 6.56 7.0 7.4 7.9 8.3 8.7 9.2 9.6 10.1 10.5 10.9 11.4
24 4.00 4.50 5.00 5.50 6.00 6.50 7.00 7.50 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0
27 5.06 5.62 6.19 6.75 7.32 7.87 8.44 9.0 9.6 10.1 10.7 11.2 11.8 12.4 12.9 13.5 14.1 14.6
30 6.25 6.88 7.50 8.12 8.75 9.37 10.0 10.6 11.2 11.9 12.5 13.1 13.7 14.4 15.0 15.6 16.2
33 7.56 8.25 8.94 9.62 10.30 11.0 11.7 12.4 13.1 13.7 14.4 15.1 15.8 16.5 17.2 17.9
36 9.00 9.75 10.50 11.20 12.0 12.7 13.5 14.2 15.0 15.7 16.5 17.2 18.0 18.7 19.5
"W"
INCHES
Type KDX coils over 120” N.T.L. are considered special.
Consult Local KeepRite Refrigeration Sales Office for coils other than sizes shown above
81 84 87 90 93 96 99 102 105 108 111 114 117 120 123 126 129 132 135 138 141 144
12 6.8 7.0 7.3 7.5 7.8 8.0 8.3 8.5 8.8 9.0 9.3 9.5 9.8 10.0
15 8.4 8.7 9.1 9.4 9.7 10.0 10.3 10.6 10.9 11.2 11.6 11.9 12.2 12.5
18 10.1 10.5 10.9 11.2 11.6 12.0 12.4 12.7 13.1 13.5 13.9 14.2 14.6 15.0 15.4 15.8
21 11.8 12.2 12.7 13.1 13.6 14.0 14.4 14.9 15.3 15.7 16.2 16.6 17.1 17.5 17.9 18.4 18.8 19.3
24 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 18.5 19.0 19.5 20.0 20.5 21.0 21.5 22.0 22.5 23.0 23.5 24.0
27 15.2 15.7 16.3 16.9 17.4 18.0 18.6 19.1 19.7 20.2 20.8 21.4 21.9 22.5 23.1 23.6 24.2 24.8 25.3 25.9 26.4 27.0
30 16.9 17.5 18.1 18.7 19.3 20.0 20.6 21.2 21.9 22.5 23.1 23.7 24.4 25.0 25.6 26.2 26.9 27.5 28.1 28.8 29.4 30.0
33 18.6 19.2 19.7 20.6 21.3 22.0 22.7 23.4 24.0 24.7 25.4 26.1 26.8 27.5 28.2 28.9 29.6 30.2 30.9 31.6 32.3 33.0
36 20.2 21.0 21.8 22.5 23.2 24.0 24.7 25.5 26.2 27.0 27.7 28.5 29.2 30.0 30.7 31.5 32.2 33.0 33.7 34.5 35.2 36.0
- 6 -
DEHUMIDIFYING COIL SELECTION
EXAMPLE PROBLEM NO. 1
(Showing Use of R-12 Direct Selection Table No. 3)
GIVEN:
Entering Air Dry Bulb.......................................................................................................94°F
Entering Air Wet Bulb.......................................................................................................74°F
CFM (Std Air)...............................................................................................................13,600
Total BTUH Required................................................................................................691,000
Sensible BTUH Required..........................................................................................454,000
Refrigerant Temperature.................................................................................................40°F
Refrigerant......................................................................................................................R-12
Maximum Face Velocity..........................................................................................510 FPM
Maximum Height of Coil-Over Casing....................................................................37 Inches
SOLUTION
1. SENSIBLE TOTAL RATIO
S/T ratio =
total Btuh 691,000
As the S/T ratio is below .90 the direct selection tables can be
used.
sensible Btuh 454,000
= .657 (Formula 6)
6. REQUIRED LEAVING DRY BULB TEMPERATURE
Req’d lvg dry bulb = ent dry bulb -
1.09 X cfrn
109 X 13,600
= 94 - 30.6 = 63.4 F (Formula 3a)
= 94 -
454,000
sensible Btuh
2. MINIMUM FACE AREA REQUIRED
cfm
FA =
face velocity 510
=
13,600
= 26.7 sq. ft. (Formula 4)
3. PHYSICAL SIZE
From Table 1, Page 6 select a coil that has a face area equal
to, or greater than 26.7 sq ft and not exceeding the 37”
overall height specified. (See Page 37 for casing
dimensions.)
For the example problem we have assumed that the correct
selection is a 33 X 117 coil with 26.8 sq ft of face area.
4. ACTUAL FACE VELOCITY
FV (actual) =
face area 26.8
In using the direct selection tables a face velocity of 500 fpm
can be used with negligible error. In critical cases
interpolation may be necessary.
cfm 13,600
= 508 fpm (Formula 5)
5. TONS PER SQUARE FOOT OF FACE AREA
REQUIRED
Tons/sq ft =
face area X 12,000 26.8 X 12,000
total Btuh
691,000
=
(Formula 7)
= 2.15
7. COIL SELECTION
Refer to the 40°F refrigerant temperature, 74°F entering air wet
bulb section of the R-12 direct selection table (Table 3, Page 17).
Enter this section at 500 fpm and proceed down to 2.17 tons/sq
ft. This meets the 2.15 tons/sq ft requirements. Reading to the
left, this is a model 104 coil. The leaving air wet bulb, immediately
to the right of the 2.17 tons/sq ft, is 59.6 F.
8. LEAVING AIR DRY BULB FOR 4 ROW 100 FIN
SERIES COIL
Lvg air dry bulb = Lvg air wet bulb + (wet bulb depression
factor) X (initial wet bulb depression)
(Formula 3b)
= 59.6 + (.09 X 20) = 59.6 +1.8° = 61.4° D.B.
Where: .09 = wet bulb depression factor for 100 fin series,
500 fpm and 4 rows deep (Fig. 7C Page 32)
20 = 94-74 = initial wet bulb depression (Formula 8)
The leaving air dry bulb is 61.4°F which meets 63.4°F calculated
in Step 6 and will satisfy the sensible cooling requirements.
The final selection is a “KDX104- 33 X 117” R-12 DX Coil.
9. ACTUAL CAPACITY OF COIL SELECTED
Total Btuh = (tons/sq ft) X (face area) X 12,000 (Formula 7)
= 2.17 X 26.8 X 12,000 = 697,000
Sensible Btuh = 1.09 X cfm X (ent air dry bulb lvg air dry bulb) (Formula 2)
= 1.09 X 13,600 X (94 - 61.4)
= 484,000
- 7 -
DEHUMIDIFYING COIL SELECTION
EXAMPLE PROBLEM NO. 2
(Showing Use of R-22 Direct Selection Table No. 4)
GIVEN:
Entering Air Dry Bulb.......................................................................................................84 F
Entering Air Wet Bulb......................................................................................................68 F
CFM (Std Air).................................................................................................................3090
Leaving Air Dry Bulb.....................................................................................................54.0 F
Leaving Air Wet Bulb....................................................................................................53.7 F
Refrigerant Temperature.................................................................................................45 F
Refrigerant......................................................................................................................R-22
Maximum Face Velocity...........................................................................................550 FPM
1. TOTAL BTUH REQUIRED
Total Btuh = 4.5 X cfm X (total heat difference) (Formula 1)
Total heat ent air @ 68.0°F wet bulb = 32.42 Btu/lb
Total heat lvg air @ 53.7°F wet bulb = 22.44
Total heat difference = 9.98 Btu/lb
(Table 2, Page 10)
Total Btuh = 4.5 X 3090 X 9.98 = 138,800
2. SENSIBLE BTUH REQUIRED
Sensible Btuh = 1.09 X cfm X (ent air dry bulb - lvg air
dry bulb) (Formula 2)
= 1.09 X 3090 X (84 - 54)
= 1.09 X 3090 X 30 = 101,040
3. SENSIBLE TOTAL RATIO
S/T ratio =
total Btuh 138,800
As the S/T ratio is below .90 the direct selection tables can
be used
4. MINIMUM FACE AREA REQUIRED
FA =
face Velocity 500
5. PHYSICAL DIMENSION OF COIL FACE
From Table 1, Page 6 select a coil that has a face area
equal to, or greater than 5.62 sq ft.
For this example assume that the correct selection is an
18 X 45 coil with 5.62 sq ft of face area.
6. TONS PER SQUARE FOOT OF FACE AREA REQUIRED
Tons/sq ft =
face area X 12,000 5.62 X 12,000
sensible Btuh = 101,040
cfm = 3090
total Btuh = 138,800
= 2.06 (Formula 7)
= .728 (Formula 6)
= 5.62 sq ft (Formula 4)
- 8 -
7. PRELIMINARY COIL SELECTION
Refer to the 45°F refrigerant temperature, 68°F entering
air wet bulb section of the R-22 direct selection table
(Table 4. Page 28). Enter this section at 550 fpm and
proceed down to 2.06 tons/sq ft. This exactly meets the
load requirements. Reading to the left, this is a model 106
coil.
The leaving air wet bulb, immediately to the right of the
2.06 tons,/sq ft, is 53.7 F.
8. LEAVING AIR DRY BULB
Lvg air dry bulb = (Ivg air wet bulb) + (wet bulb
depression factor) X (initial wet bulb
depression)
= 53.7 + (.031 X 16) = 53.7 + 0.5
= 54.2 F (Formula 3b)
Where: .031 = wet bulb depression factor for 100 fin
series, 550 fpm and 6 rows deep
(Figure 7c, Page 32)
16 = 84 - 68 = initial wet bulb depression
(Formula 8)
Since the lvg air dry bulb is above the 54.0°F required, a
model 126 coil should be selected.
9. RESELECTION - DETERMINE CAPACITY OF A MODEL
126 COIL
Return to Table 4, Page 28. The tons/ /sq ft for a model
126 coil is 2.16 and the leaving air wet bulb is 52.9°F.
Both exceed the requirements.
Determine the leaving air dry bulb as follows:
Lvg air dry bulb = 52.9 + (0.25 X 16) = 52.9 + .4 = 53.3°F
Where: .025 = wet bulb depression factor for 120 fin
series, 550 fpm and 6 rows deep
(Figure 7d, Page 32)
This is below the required 54.0°F.
Therefore, the final selection is a KDX 126 - 18"X 45"
R-22 DX Coil.
DEHUMIDIFYING COIL SELECTION
EXAMPLE PROBLEM NO. 3
(Showing Use of the Basic Rating Curves-Pages 24 and 25)
GIVEN:
Entering Air Dry Bulb.......................................................................................................60°F
Entering Air Wet Bulb......................................................................................................58°F
CFM (Std Air)..................................................................................................................2000
Total BTUH Required..................................................................................................64,250
Sensible BTUH Required............................................................................................31,000
Refrigerant Temperature.................................................................................................36°F
Refrigerant......................................................................................................................R-22
Maximum Face Velocity...........................................................................................450 FPM
1 . SENSIBLE TOTAL RATIO
S/T ratio =
total Btuh 64,250
As S/T ratio is below .90 the basic rating curves on page
31 can be used.
2. MINIMUM FACE AREA REQUIRED
FA =
face velocity 450
3. PHYSICAL SIZE
From Table 1, Page 6 select a coil that has a face area
equal to, or greater than 4.45 sq ft.
For this example assume that the correct selection is an
18 X 36 coil with 4.5 sq ft of face area. This is close
enough to 4.45 sq ft to use 450 fpm.
4. TONS PER SQUARE FOOT REQUIRED
Tons/sq ft =
face area X 12,000 4.5 X 12,000
(Formula 7)
5. BASE RATING
Turn to the R-22 Base Rating Curves (Figure 5, Page 25).
The base rating for 58 F entering air wet bulb and 36°F
refrigerant temperature is 1.19 tons/sq ft.
6. VELOCITY AND ROW CORRECTION FACTOR
REQUIRED
In view of the low S/T ratio a series 70 coil will be
checked.
VR correction factor =
= 1.19
1.19 X .93
Where: .93 = fin correction factor for 70 fin series (Table 6,
sensible Btuh
cfm
=
total Btuh
Page 31)
31,000
=
2000
= 4.45 sq ft (Formula 4)
tons/sq ft
(base rating) X (fin correction factor)
= .482 (Formula 6)
64,250
=
= 1.075
= 1.19
8. ACTUAL TOTAL BTUH OF 5 ROW 70 FIN SERIES COIL
Total Btuh = 12,000 X (base rating) X (face area) X (VR
corr fact.) X (fin series corr fact.)
= 12,000 X 1.19 X 4.5 X 1.088 X .93 = 65,020
This meets the total load requirements.
9. LEAVING AIR WET BULB FOR 5 ROW 70 FIN SERIE COIL
Total Btuh = 4.5 X cfm X (total heat difference) (Formula 1)
Total heat difference =
Total heat ent air @ 58°F wet bulb = 25.12 Btu/lb
Total heat difference = 7.22
Total heat lvg air = 17.90 Btu/lb
Lvg air wet bulb = 45.5°F
10. LEAVING AIR DRY BULB FOR 5 ROW 70 FIN SERIES
COIL
Lvg air dry bulb = (Lvg air wet bulb) + (wet bulb depression
factor) X (initial wet bulb depression)
(Formula 3b)
= 45.5 + (.079 X 2) = 45.5 + .2 = 45.7
Where: .079 = wet bulb depression factor for 70 fin series,
450 fpm and 5 rows deep (Fig. 7a, Page 32)
2 = 60-58 = initial wet bulb depression (Formula 8)
11. SENSIBLE BTUH OF 5 ROW 70 FIN SERIES COIL
Sensible Bruh = 1.09 X cfm X (ent air dry bulb-lvg air dry
bulb) (Formula 2)
= 1.09 X 2000 X (60-45.7)
= 1.09 X 2000 X 14.3 = 31,174
total Btuh = 65,020
4.5 X cfm 4.5 X 2000
(Table 2, Page 10)
= 7.22 Btu/lb
7. ROWS DEEP REQUIRED
Turn to the R-22 Velocity and Row Correction Factor
Curves (Figure 6, Page 31). At the required 1.075 velocity
and row correction factor and 450 fpm, a 5 row 70 fin series
coil will be required. This coil has an actual velocity and
row correction factor of 1.088.
12. FINAL COIL SELECTION
The final coil selected is a KDX75-18"X36" R-22 DX Coil
A KDX124-18"X36" Coil would also meet requirements;
however, it exceeds the total load and the sensible load by
a wide margin.
- 9 -
TOTAL HEAT
TABLE 2 - BTU CONTENT OF 1 LB. OF DRY AIR WITH WATER VAPOR REQUIRED
FOR COMPLETE SATURATION†
(Standard Atmospheric Pressure 29.921” HG.)
WET
BULB
°F. *
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
.0 .1 .2 .3 .4 .5 .6 .7 .8 .9
13.01
13.44
13.87
14.32
14.77
15.23
15.70
16.17
16.66
17.15
17.65
18.16
18.68
19.21
19.75
20.30
20.86
21.44
22.02
22.61
23.22
23.84
24.48
25.12
25.78
26.46
27.15
27.85
28.57
29.31
30.06
30.83
31.62
32.42
33.25
34.09
34.95
35.83
36.74
37.66
38.61
39.57
40.57
41.58
42.62
43.69
44.78
45.90
47.04
48.22
49.43
13.05
13.48
13.92
14.36
14.82
15.28
15.74
16.22
16.71
17.20
17.70
18.21
18.73
19.26
19.81
20.36
20.92
21.49
22.08
22.68
23.28
23.90
24.54
25.19
25.85
26.53
27.22
27.92
28.64
29.38
30.14
30.91
31.70
32.50
33.33
34.18
35.04
35.92
36.83
37.75
38.71
39.67
40.67
41.68
42.73
43.80
44.89
46.01
47.16
48.34
49.55
13.09
13.52
13.96
14.41
14.86
15.32
15.79
16.27
16.75
17.25
17.75
18.26
18.79
19.32
19.86
20.41
20.98
21.55
22.14
22.74
23.34
23.97
24.61
25.25
25.92
26.60
27.29
27.99
28.72
29.46
30.21
30.99
31.78
32.59
33.42
34.26
35.13
36.01
36.92
37.85
38.80
39.77
40.77
41.79
42.83
43.91
45.00
46.13
47.28
48.46
49.68
13.14
13.57
14.01
14.45
14.91
15.37
15.84
16.32
16.80
17.30
17.80
18.32
18.84
19.37
19.92
20.47
21.03
21.61
22.20
22.80
23.41
24.03
24.67
25.32
25.98
26.67
27.36
28.07
28.79
29.53
30.29
31.07
31.86
32.67
33.50
34.35
35.21
36.10
37.02
37.94
38.90
39.87
40.87
41.89
42.94
44.02
45.12
46.24
47.39
48.58
49.80
TENTHS OF DEGREES
13.18
13.61
14.05
14.50
14.95
15.42
15.89
16.37
16.85
17.35
17.85
18.37
18.89
19.43
19.97
20.52
21.09
21.67
22.26
22.86
23.47
24.10
24.74
25.38
26.05
26.74
27.43
28.14
28.87
29.61
30.37
31.15
31.94
32.75
33.59
34.43
35.30
36.19
37.11
38.04
39.00
39.98
40.97
42.00
43.05
44.13
45.23
46.36
47.51
48.70
49.92
13.22
13.66
14.10
14.54
15.00
15.46
15.93
16.41
16.90
17.40
17.91
18.42
18.95
19.48
20.03
20.58
21.15
21.73
22.32
22.92
23.53
24.16
24.80
25.45
26.12
26.80
27.50
28.21
28.94
29.68
30.44
31.22
32.02
32.83
33.67
34.52
35.39
36.28
37.20
38.13
39.09
40.07
41.07
42.10
43.15
44.23
45.34
46.47
47.63
48.82
50.04
13.27
13.70
14.14
14.59
15.05
15.51
15.98
16.46
16.95
17.45
17.96
18.47
19.00
19.53
20.08
20.64
21.21
21.79
22.38
22.98
23.59
24.22
24.86
25.52
26.19
26.87
27.57
28.28
29.01
29.76
30.52
31.30
32.10
32.92
33.75
34.61
35.48
36.38
37.29
38.23
39.19
40.17
41.18
42.20
43.26
44.34
45.45
46.58
47.75
48.95
50.17
13.31
13.74
14.19
14.63
15.09
15.56
16.03
16.51
17.00
17.50
18.01
18.52
19.05
19.59
20.14
20.69
21.26
21.84
22.44
23.04
23.65
24.29
24.93
25.58
26.26
26.94
27.64
28.35
29.09
29.83
30.60
31.38
32.18
33.00
33.84
34.69
35.57
36.47
37.38
38.32
39.28
40.27
41.28
42.31
43.37
44.45
45.56
46.70
47.87
49.07
50.29
13.35
13.79
14.23
14.68
15.14
15.60
16.08
16.56
17.05
17.55
18.06
18.58
19.10
19.64
20.19
20.75
21.32
21.90
22.50
23.10
23.72
24.35
24.99
25.65
26.32
27.01
27.71
28.43
29.16
29.91
30.68
31.46
32.26
33.08
33.92
34.79
35.65
36.56
37.48
38.42
39.38
40.37
41.38
42.41
43.48
44.56
45.68
46.81
47.98
49.19
50.41
13.39
13.83
14.27
14.73
15.18
15.65
16.12
16.61
17.10
17.60
18.11
18.63
19.16
19.70
20.25
20.81
21.38
21.96
22.56
23.16
23.78
24.42
25.06
25.71
26.39
27.08
27.78
28.50
29.24
29.98
30.75
31.54
32.34
33.17
34.00
34.86
35.74
36.65
37.57
38.51
39.47
40.47
41.48
42.52
43.58
44.67
45.79
46.93
48.10
49.31
50.54
* Use wet bulb temperature only in determining total heat † Compiled from data in ASHRAE Guide.
- 10 -
CONVERSION OF AIR VOLUME TO STANDARD AIR
FIGURE 1 - TEMPERATURE CONVERSION FACTOR
1.30
1.25
)
1
TEMPERATURE CONVERSION FACTOR (F
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
-50 -25 0 25 50 75 100 125 150 175 200 225 250 275 300 325
350
TEMPERATURE °F
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
When the specified air volume (CFM) is given at any temperature other than 70 °F or at any altitude other than sea level, these charts should be
used for correction before using the following capacity and friction tables (which are based on CFM @ standard air conditions).
FIGURE 2 - ALTITUDE CONVERSION FACTOR
1.025
1.000
0.975
)
2
0.950
0.925
0.900
0.875
0.850
0.825
0.800
0.775
TEMPERATURE CONVERSION FACTOR (F
0.750
0.725
0.700
-500 0 500 1500 2500 3500 4500 5500 6500 7500 8500
ALTITUDE (FEET ABOVE SEA LEVEL)
1.025
1.000
0.975
0.950
0.925
0.900
0.875
0.850
0.825
0.800
0.775
0.750
0.725
0.700
Example: To convert 15,900 CFM of air at 94 °F and at 3,000
ft. altitude to standard conditions:
CFM of Std. Air
= CFM of specified Air x F1 x F
2
= 15,900 X 955 X .896 = 13,600
Where: F1 = Temperature conversion factor from Fig. 1.
F2 = Altitude conversion factor from Fig. 2.
- 11 -
DIRECT EXPANSION COIL RATINGS
FOR REFRIGERANT R-12 - 35°35°
TABLE 3 8°F SUPER HEAT
ENT.
WET
BULB
°F
65
66
67
68
COIL
MODEL
73
83
103
123
74
84
104
124
75
85
105
125
76
86
106
126
78
88
108
128
73
83
103
123
74
84
104
124
75
85
105
125
76
86
106
126
78
88
108
128
73
83
103
123
74
84
104
124
75
85
105
125
76
86
106
126
78
88
108
128
73
83
103
123
74
84
104
124
75
85
105
125
76
86
106
126
78
88
108
128
400 425 450 475 500 525 550 575 600
TONS
LVG.
TONS
LVG.
TONS
PER
SQ. FT.
1.08
1.16
1.24
1.29
1.33
1.43
1.52
1.59
1.53
1.64
1.75
1.82
1.68
1.81
1.93
2.01
1.93
2.08
2.22
2.31
1.13
1.22
1.30
1.35
1.39
1.49
1.59
1.65
1.59
1.71
1.82
1.90
1.76
1.89
2.01
2.10
2.02
2.17
2.31
2.41
1.18
1.27
1.35
1.41
1.45
1.56
1.66
1.73
1.66
1.79
1.91
1.99
1.83
1.97
2.10
2.19
2.11
2.27
2.42
2.52
1.24
1.33
1.42
1.48
1.51
1.62
1.73
1.80
1.73
1.86
1.98
2.06
1.92
2.06
2.19
2.29
2.19
2.36
2.51
2.62
WET
BULB
54.4
53.5
52.6
52.0
51.6
50.4
49.3
48.5
49.2
47.8
46.4
45.5
47.3
45.7
44.1
43.0
44.1
42.0
40.1
38.8
55.1
54.1
53.2
52.7
52.2
51.1
49.8
49.1
49.9
48.4
47.0
46.0
47.8
46.1
44.6
43.4
44.4
42.4
40.4
39.0
55.9
54.9
54.0
53.3
52.9
51.6
50.5
49.6
50.5
48.9
47.4
46.4
48.4
46.6
44.9
43.7
44.8
42.7
40.6
39.1
56.5
55.5
54.6
53.9
53.6
52.3
51.0
50.2
51.0
49.5
48.0
47.0
48.8
47.0
45.3
44.0
45.3
43.1
41.0
39.4
PER
SQ. FT.
1.12
1.20
1.28
1.33
1.37
1.47
1.57
1.63
1.57
1.69
1.80
1.88
1.75
1.88
2.00
2.09
2.02
2.17
2.31
2.41
1.16
1.25
1.33
1.39
1.43
1.54
1.64
1.71
1.65
1.77
1.89
1.96
1.82
1.96
2.09
2.18
2.10
2.20
2.41
2.51
1.22
1.31
1.40
1.45
1.49
1.60
1.70
1.78
1.72
1.85
1.97
2.05
1.91
2.05
2.18
2.28
2.19
2.36
2.51
2.62
1.26
1.36
1.45
1.51
1.55
1.67
1.78
1.85
1.79
1.93
2.06
2.14
1.99
2.14
2.28
2.38
2.30
2.47
2.63
2.74
WET
BULB
54.7
53.8
53.0
52.5
52.0
51.0
49.8
49.1
49.8
48.5
47.2
46.2
47.7
46.2
44.7
43.6
44.5
42.6
40.7
39.4
55.5
54.6
53.8
53.1
52.7
51.5
49.5
48.6
50.3
48.9
47.5
46.7
48.4
46.7
45.1
44.0
45.0
43.0
41.0
39.7
56.2
55.3
54.4
53.8
53.4
52.2
51.2
50.3
50.9
49.5
48.1
47.1
48.8
47.1
45.6
44.3
45.4
43.3
41.4
39.9
57.1
56.1
55.2
54.5
54.1
52.9
51.7
50.9
51.6
50.0
48.5
47.6
49.3
47.6
45.6
44.7
45.6
43.5
41.5
40.0
PER
SQ. FT.
1.14
1.23
1.31
1.37
1.41
1.52
1.62
1.69
1.63
1.75
1.86
1.94
1.81
1.95
2.08
2.16
2.09
2.25
2.40
2.50
1.19
1.28
1.36
1.42
1.48
1.59
1.69
1.76
1.70
1.83
1.95
2.03
1.89
2.03
2.16
2.25
2.19
2.36
2.51
2.62
1.25
1.34
1.43
1.49
1.54
1.66
1.77
1.84
1.78
1.91
2.03
2.12
1.97
2.12
2.26
2.35
2.29
2.46
2.62
2.73
1.30
1.40
1.49
1.55
1.61
1.73
1.84
1.92
1.86
2.00
2.13
2.22
2.06
2.21
2.35
2.45
2.39
2.57
2.74
2.85
LVG.
WET
BULB
55.1
54.2
53.5
52.9
52.5
51.3
50.3
49.3
50.2
48.9
47.7
46.8
48.2
46.7
45.2
44.2
45.0
43.1
41.3
40.0
55.9
55.0
54.3
53.7
53.1
51.9
50.9
50.2
50.8
49.4
48.1
47.2
48.8
47.2
45.7
44.7
45.4
43.5
41.6
40.2
56.6
55.7
54.9
54.3
53.8
52.6
51.5
50.7
51.4
50.0
48.7
47.7
49.4
47.7
46.1
45.1
45.8
43.8
41.8
40.5
57.4
56.4
55.6
55.0
54.4
53.3
52.1
51.3
51.9
50.5
49.1
48.1
49.8
48.2
46.6
45.5
46.2
44.1
42.0
40.6
COIL FACE VELOCITY - FPM
TONS
LVG.
WET
BULB
55.4
54.6
53.9
53.3
52.8
51.8
50.8
50.1
50.6
49.3
48.0
47.2
48.7
47.2
45.8
44.9
45.3
43.5
41.8
40.5
56.1
55.3
54.5
53.9
53.5
52.4
51.4
50.7
51.1
49.8
48.6
47.7
49.2
47.7
46.2
45.2
45.7
43.9
42.0
40.7
57.0
56.1
55.3
54.8
54.2
53.1
52.0
51.3
51.8
50.5
49.1
48.2
49.8
48.2
46.7
45.6
46.2
44.2
42.2
41.0
57.7
56.9
56.1
55.4
54.9
53.8
52.6
52.0
52.4
51.0
49.7
48.6
50.3
48.6
47.1
46.0
46.8
44.7
42.7
41.3
TONS
PER
SQ. FT.
1.20
1.29
1.37
1.43
1.49
1.60
1.70
1.78
1.73
1.86
1.98
2.06
1.93
2.08
2.22
2.31
2.26
2.43
2.59
2.70
1.26
1.35
1.44
1.50
1.55
1.67
1.78
1.85
1.80
1.94
2.07
2.15
2.02
2.17
2.31
2.41
2.36
2.54
2.71
2.82
1.31
1.41
1.50
1.57
1.62
1.74
1.85
1.93
1.89
2.03
2.16
2.25
2.11
2.27
2.42
2.52
2.46
2.65
2.82
2.94
1.37
1.47
1.57
1.63
1.69
1.82
1.94
2.02
1.97
2.12
2.26
2.35
2.19
2.36
2.51
2.62
2.57
2.76
2.94
3.06
PER
SQ. FT.
1.17
1.26
1.34
1.40
1.45
1.56
1.66
1.73
1.68
1.81
1.93
2.01
1.87
2.01
2.14
2.23
2.18
2.34
2.49
2.60
1.23
1.32
1.41
1.47
1.52
1.63
1.74
1.81
1.76
1.89
2.01
2.10
1.95
2.10
2.24
2.33
2.28
2.45
2.61
2.72
1.27
1.37
1.46
1.52
1.58
1.70
1.81
1.89
1.83
1.97
2.10
2.19
2.04
2.19
2.33
2.43
2.38
2.56
2.73
2.84
1.33
1.43
1.52
1.59
1.65
1.77
1.89
1.96
1.92
2.06
2.19
2.29
2.13
2.29
2.44
2.54
2.47
2.66
2.83
2.95
LVG.
WET
BULB
55.7
54.9
54.2
53.7
53.2
52.2
51.2
50.5
50.9
49.7
48.5
47.7
49.0
47.5
46.1
45.2
45.7
43.9
42.2
40.9
56.4
55.8
54.9
54.4
53.9
52.8
51.8
51.2
51.6
50.3
49.1
48.3
49.6
48.1
46.7
45.6
46.2
44.3
42.4
41.2
57.2
56.4
55.7
55.0
54.6
53.5
52.5
51.8
52.2
50.9
49.6
48.8
50.1
48.6
47.1
46.0
46.7
44.7
42.8
41.5
58.0
57.2
56.3
55.8
55.3
54.1
53.1
52.4
52.8
51.4
50.1
49.2
50.8
49.1
47.7
46.6
47.1
45.1
43.2
41.8
TONS
PER
SQ. FT.
1.23
1.32
1.41
1.47
1.53
1.64
1.75
1.82
1.78
1.91
2.03
2.12
1.99
2.14
2.28
2.38
2.33
2.50
2.66
2.78
1.28
1.38
1.47
1.53
1.59
1.71
1.82
1.90
1.86
2.00
2.13
2.22
2.04
2.24
2.39
2.49
2.44
2.62
2.79
2.91
1.34
1.44
1.53
1.60
1.66
1.78
1.90
1.98
1.94
2.09
2.23
2.32
2.18
2.34
2.49
2.60
2.54
2.73
2.91
3.03
1.40
1.50
1.60
1.67
1.73
1.86
1.98
2.06
2.03
2.18
2.32
2.42
2.27
2.44
2.60
2.71
2.65
2.85
3.02
3.15
LVG.
WET
BULB
56.0
55.2
54.5
54.0
53.4
52.5
51.5
50.9
51.3
50.1
49.0
48.2
49.4
48.0
46.6
45.6
46.1
44.4
42.8
41.5
56.8
56.0
55.2
54.7
54.2
53.2
52.3
51.5
51.9
50.7
49.5
48.6
49.9
48.4
47.0
46.0
46.5
44.7
43.0
41.7
57.5
56.7
56.0
55.4
54.9
53.9
52.9
52.2
52.6
51.2
50.0
49.2
50.4
49.0
47.5
46.5
47.1
45.2
43.4
42.1
58.3
57.5
56.7
56.2
55.7
54.6
53.6
52.9
53.1
51.8
50.6
49.7
51.1
49.5
47.9
47.0
47.5
45.6
43.9
42.5
TONS
PER
SQ. FT.
1.25
1.34
1.43
1.49
1.55
1.67
1.78
1.85
1.82
1.96
2.09
2.18
2.05
2.20
2.34
2.44
2.40
2.58
2.75
2.86
1.30
1.40
1.49
1.55
1.63
1.75
1.86
1.94
1.91
2.05
2.18
2.28
2.14
2.30
2.45
2.55
2.51
2.70
2.88
3.00
1.37
1.47
1.57
1.63
1.70
1.83
1.95
2.03
1.99
2.14
2.28
2.38
2.23
2.40
2.56
2.66
2.62
2.82
3.00
3.13
1.42
1.53
1.63
1.70
1.78
1.91
2.03
2.12
2.07
2.23
2.37
2.48
2.33
2.50
2.66
2.78
2.73
2.94
3.13
3.26
LVG.
WET
BULB
56.3
55.5
54.8
54.4
53.9
52.9
52.0
51.4
51.7
50.5
49.3
48.5
49.7
48.3
47.1
46.1
46.5
44.8
43.1
42.0
57.1
56.3
55.6
55.2
54.5
53.4
52.6
52.0
52.2
51.0
49.9
49.0
50.3
48.9
47.5
46.6
47.0
45.2
43.4
42.2
57.8
57.0
56.3
55.8
55.3
54.2
53.2
52.6
52.9
51.7
50.5
49.6
50.9
49.4
48.0
47.1
47.4
45.6
43.9
42.6
58.6
57.8
57.1
56.5
55.9
54.9
53.9
53.2
53.6
52.3
51.1
50.2
51.5
50.0
48.6
47.5
47.9
46.0
44.2
42.9
TONS
PER
SQ. FT.
1.27
1.37
1.46
1.52
1.59
1.71
1.82
1.90
1.86
2.00
2.14
2.23
2.09
2.25
2.40
2.50
2.46
2.65
2.82
2.94
1.33
1.43
1.52
1.59
1.66
1.79
1.91
1.99
1.94
2.09
2.23
2.32
2.19
2.35
2.50
2.61
2.58
2.77
2.95
3.07
1.40
1.50
1.60
1.67
1.73
1.86
1.98
2.06
2.03
2.18
2.32
2.42
2.29
2.46
2.62
2.73
2.70
2.90
3.09
3.22
1.45
1.56
1.66
1.73
1.80
1.94
2.07
2.15
2.12
2.28
2.43
2.53
2.38
2.56
2.73
2.84
2.81
3.02
3.22
3.35
LVG.
WET
BULB
56.5
55.8
55.1
54.7
54.1
53.2
52.3
51.7
52.0
50.8
49.7
48.9
50.1
48.8
47.5
46.6
46.9
45.2
43.7
42.5
57.3
56.6
55.9
55.4
54.9
53.8
52.9
52.3
52.7
51.5
50.3
49.6
50.7
49.3
48.1
47.1
47.3
45.6
44.0
42.9
58.0
57.3
56.6
56.1
55.6
54.6
53.7
53.1
53.3
52.1
51.0
50.2
51.2
49.8
48.5
47.5
47.9
46.0
44.3
43.1
58.9
58.1
57.4
56.9
56.4
55.3
54.3
53.7
54.0
52.7
51.5
50.7
51.9
50.4
49.0
48.1
48.3
46.5
44.7
43.5
SQ. FT.
TONS
PER
1.30
1.40
1.49
1.55
1.62
1.74
1.85
1.93
1.90
2.04
2.17
2.26
2.14
2.30
2.45
2.55
2.53
2.72
2.90
3.02
1.36
1.46
1.55
1.62
1.69
1.82
1.94
2.02
1.99
2.14
2.28
2.38
2.23
2.40
2.56
2.66
2.64
2.84
3.02
3.15
1.41
1.52
1.62
1.69
1.77
1.90
2.02
2.11
2.06
2.22
2.36
2.46
2.33
2.51
2.67
2.79
2.76
2.97
3.16
3.30
1.48
1.59
1.69
1.76
1.84
1.98
2.11
2.20
2.17
2.33
2.48
2.59
2.44
2.62
2.79
2.91
2.88
3.10
3.30
3.44
LVG.
WET
BULB
56.7
56.0
55.3
54.9
54.4
53.5
52.7
52.1
52.3
51.3
50.2
49.5
50.4
49.2
47.9
47.1
47.3
45.6
44.0
43.0
57.5
56.8
56.2
55.7
55.2
54.2
53.3
52.7
53.0
51.8
50.7
49.9
51.1
49.7
48.4
47.6
47.8
46.1
44.5
43.4
58.4
57.6
56.9
56.6
55.9
54.9
54.0
53.4
53.7
52.5
51.5
50.7
51.7
50.3
49.0
48.0
48.3
46.5
44.9
43.6
59.1
58.3
57.7
57.2
56.6
55.6
54.7
54.0
54.3
53.1
51.9
51.1
52.2
50.8
49.5
48.5
48.8
46.9
45.2
44.0
- 12 -
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