PRODUCT DATA
Bulletin K70-KHR-PDS-11
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TYPICAL REFRIGERANT HEAT RECLAIM SYSTEMS
Heat Reclaim Coils
for Refrigeration
Systems
FIG.1 SERIES CONDENSER
General;There are basically two types of heat reclaim
coils used for refrigeration jobs:- 1. The heat reclaim coil
in series with an outside condenser. 2. The heat reclaim
coil in parallel with the outside condenser .
Systern 1 Usually this type of coil is designed to recover
a maximum of 50% of the total heat of rejection, the
balance then being handled by the outside condenser.
Because the heat reclaim coil is in series with the
outside condenser , the refrigerant pressure drop through
the coil must be kept to a minimum. It is desirable to
feed as many face tubes on the coil as possible to
obtain this low pressure drop. Self-draining circuiting is
also desirable when using this arrangement. When used
in a series condensing system this type of heat reclaim
coil is referred to by KeepRite Refrigeration as a
“Desuperheater type coil”, although some condensing
may also take place. A typical series system is shown
in Fig 1.
FIG. 2 PARALLEL CONDENSERS
System 2 This type of system will require the heat reclaim
coil to handle 100% of the total heat of rejection. Coil will
perform as the main condenser when heat is required.
When there is no heat demand the total heat of rejection
will be directed to the outside unit. This application of heat
reclaim is known as a “Condenser type” and will be circuited
in the same manner as any condenser. A typical parallel
system is shown in Fig. 2. A parallel system may also
utilize less than 100% of Total Heat of Rejection, by
installing a by pass line to the main condenser .
GENERAL INFORMATION
Tables 1 and 2 may be used to select the coil sizes
compatible with specific KeepRite air handling units.
T able 1 indicates the sizes and face areas of T ype HR
insert type coils as used in KLS and KHD units. Table 2
indicates the coil sizes and face areas of type KC coils
bolted to the KHF fan head.
GENERAL INFORMATION (cont’d.)
It must be remembered that in models KLS 237 thru 164 air
handlers, two cooling coils are used. It is therefore possible
condensing system. T otal heat of rejection is 800,000
BTU/hr., 400,000 BTU/hr will be used for heat reclaim.
Condensing temperature is 1 10 °F , entering air is 65°F.
that the centre two tubes of a single H.R. heat reclaim coil
mounted against the two cooling coils may not receive the
full air flow. (See Bulletin AC4.7-SB1-2 Central Station Air
STEP 1. Coil size is 36" x 84-1/2" and air quantity
circulated is 10,600 C.F .M. (See Table 1).
Handlers).
Table 3 indicates the standard type of KC coil that may be
used for mounting in ductwork.
STEP 2. Determine the required coii performance in
BTU/hr. /C.F.M. from Total Load BTU/hr .
C.F.M.
HEAT RECLAIM SELECTION FORM
T o assist in the selection of heat reclaim coils, the KeepRite
Condenser Heat Reclaim Coil Selection Sheet may be used.
400,000
=
10,600
= 37.73 BTU/hr/C.F.M.
(See back cover.) For multiple compressor applications, the
BTU/Hour capacity for each unit may be tabulated.
Correction factors for T otal Heat of Rejection should be
applied from Chart 6. Actual tubes required to handle the
heat of rejection of each compressor may also be
calculated and listed. It should be noted when using 3 or 4
Row coils as Desuperheater type coils on a series system
that there will be one less tube in the face due to the free
drainage circuiting. A typical calculation is shown on
Page 7.
STEP 3. Temperature difference is 45°F. (Cond. Temp.
minus ent. air temp.). Refer to Chart 2. Using a 6 Row Coil,
10 F.P.l. at 500 F.P.M. note that the available capacity is
38.3 BTU/hr./C.F.M. This is close to the required capacity
and will be satisfactory .
STEP 4. Final T.D. will be as follows:
Performance Required (Step 2)
Performance Obtained (Step 3)
X 45°F .
= 37.73 X 45°F = 44.3°F, T.D.
38.3
SELECTING A TYPICAL HR HEA T RECLAIM COIL
Given: An insert type heat reclaim coil is to be used in a
KeepRite KLS222 air handler. Coil will be operating with an
air face velocity of 500 F .P.M., and is used on a series type
INFORMA TION SHOWN BELOW IS FOR GENERAL ARRANGEMENT AND DIMENSIONAL PURPOSES ONL Y
STEP 5. Coil selection is 1 - H R heat reclaim coil
10 F .P.I., 6 rows - 36" X 84 12” for use in a KeepRite
KLS 222 Air handling unit. Unit air volume 10,600 C.F.M.
Coil to be desuperheater type with 24 tubes fed.
Multiple Circuit Connection Sizes* and header Dimensions
TAEHLATOTTAEHLATOT
TAEHLATOTTAEHLATOT
TAEHLATOT
SNOT
SAGTOHSAGTOH
SAGTOHSAGTOH
SAGTOH
.S.D.O,TELNI.S.D.O,TELNI
.S.D.O,TELNI.S.D.O,TELNI
.S.D.O,TELNI
DIUQILDIUQIL
DIUQILDIUQIL
DIUQIL
.S.D.O,TELTUO.S.D.O,TELTUO
.S.D.O,TELTUO.S.D.O,TELTUO
.S.D.O,TELTUO
REDAEHREDAEH
REDAEHREDAEH
REDAEH
"A".MID"A".MID
"A".MID"A".MID
"A".MID
REDAEHREDAEH
REDAEHREDAEH
REDAEH
"B".MID"B".MID
"B".MID"B".MID
"B".MID
9-39-3
9-39-321-2/1921-2/19
9-3
mm75.8229.4329.4372.1479.3579.3576.6676.6673.97
sni8/118/318/318/518/128/128/528/528/13
mm22.2222.2275.8275.8229.4372.1472.1479.3579.35
sni8/78/78/118/118/318/518/518/128/12
mm26.7426.7426.7426.7426.7426.7426.7483.2583.25
sni8/718/718/718/718/718/718/7161/1261/12
mm26.7426.7426.7426.7483.2583.2537.8537.8580.56
sni8/718/718/718/7161/1261/1261/5261/5261/92
21-2/1921-2/1961-3161-31
21-2/19
61-3161-3122-7122-71
61-31
22-7122-7143-3243-32
22-71
43-3243-3224-5324-53
43-32
24-5324-5325-3425-34
24-53
25-3425-3486-3586-35
25-34
- 2 -
86-3586-3577-9677-96
86-35
NOTE:
1. Coil shown is for
Duct Application.
For insert in, or
bolting to a KeepRite
AH Unit, unit size
must be specified.
2. Header location
subject to verification
for specific orders.
Dimension data
WORWOR
WORWOR22222333334444466666
WOR
77-9677-96
77-96
.MID.MID
.MID.MID
.MID
mm0.7214.2515.0917.662
DDDDD
sni56 2/172/101
.MID.MID
.MID.MID
.MID
mm26.7472.1413.348.05
PPPPP
sni8/718/514/312
NOTE: HEADERS MAY.EXTEND BEYOND DIMENSION “D”
* When used as Desuperheter, inlet and outlet connections will
be the same size and based on Hot Gas sizing. Every face
tube is fed on Desuperheater applications.
* For circuit loading less than 3 tons on R502 and R22, and less
than 1.7 tons on R12, no headers will be supplied. Hot gas inlet
and outlet will be 1/2” (13 mm) O.D.
FULL-FACE AREA HEAT RECLAIM COILS INSERTED IN KEEPRITE REFRIGERATION
CENTRAL STATION KLS & KHD AIR HANDLERS
Table 1 SIZE AND FACE AREA TYPE HR
SEBUTECAFSEBUTECAF
6&26&2
6&26&2
6&2
WOR
010101010199999
21212121211111111111
41414141413131313131
02020202029191919191
42424242423232323232
23232323231313131313
63636363635353535353
44444444443434343434
65656565655555555555
SEBUTECAFSEBUTECAF EZISRELDNAHRIAEZISRELDNAHRIA
SEBUTECAF
4*&34*&3
4*&34*&3
4*&3
301301
301301401401
WOR
TA.M.F.CTA.M.F.C
TA.M.F.CTA.M.F.C
TA.M.F.C
.M.P.F005
TA.M.F.CTA.M.F.C
TA.M.F.CTA.M.F.C
TA.M.F.C
.M.P.F006
301
0511057105720073003505860048006,01054,31059,71002,02056,42004,13
083100120033044406360228080,01027,21041,61045,12042,42085,92086,73
401401601601
401
2/112x51
.tf.qs3.2
601601801801
601
2/172x81
.tf.qs5.3
801801111111
801
2/173x12
.tf.qs5.5
111111412412
111
2/153x03
.tf.qs4.7
2/105x03
.tf.qs6.01
412412712712
412
2/156x33
.tf.qs7.31
712712222222
712
2/108x03
EZISRELDNAHRIAEZISRELDNAHRIA
EZISRELDNAHRIA
222222822822
222
.tf.qs8.61
822822732732
822
2/148x63
tf.qs2.12
732732141141
732
2/1701x63
.tf.qs9.62
141141051051
141
2/1701x84
.tf.qs9.53
051051461461
051
2/1701x45
.tf.qs4.04
461461
461
2/1701x66
.tf.qs3.94
HEAT RECLAIM COILS BOLTED DIRECTLY TO KHF FAN HEADS
Table 2 SIZE AND FACE AREA TYPE KC
SEBUTECAFSEBUTECAF
SEBUTECAFSEBUTECAF EZISRELDNAHRIAEZISRELDNAHRIA
6&26&2
6&26&2
6&2
WOR
21212121211111111111
41414141413131313131
61616161615151515151
22222222221212121212
62626262625252525252
43434343433333333333
04040404049393939393
64646464645454545454
85858585857575757575
SEBUTECAF
4*&34*&3
4*&34*&3
4*&3
WOR
005@.M.F.C005@.M.F.C
005@.M.F.C005@.M.F.C
005@.M.F.C
.M.P.F
006@.M.F.C006@.M.F.C
006@.M.F.C006@.M.F.C
006@.M.F.C
.M.P.F
007@.M.F.C007@.M.F.C
007@.M.F.C007@.M.F.C
007@.M.F.C
.M.P.F
301301
301301401401
301
578152620573000505660548000,01054,21007,51005,02051,42008,72000,53
401401601601
401
03x81
.tf.qs57.3
0513005400060897041,01000,21049,41048,81006,42089,82063,33000,24
601601801801
601
63x12
.tf.qs52.5
801801111111
801
54x42
.tf.qs5.7
44x33
00070139038,11000,41034,71089,12007,82018,33029,83000,94
111111412412
111
.tf.qs0.01
85x33
412412712712
412
.tf.qs3.31
712712222222
712
47x33
88x33
.tf.qs9.61
* Use the Face Tubes shown for “Desuperheater Type” coils only.
For “Condenser Type” coils, 3 & 4 Row Face tubes will be the same as 2 & 6 Row Coils.
EZISRELDNAHRIAEZISRELDNAHRIA
EZISRELDNAHRIA
222222822822
222
.tf.qs02
29x93
822822732732
822
.tf.qs9.42
611x93
732732141141
732
.tf.qs4.13
611x15
141141051051
141
.tf.qs0.14
611x06
051051461461
051
.tf.qs3.84
461461
461
611x96
.tf.qs6.55
2/1701x48
.tf.qs8.26
611x78
.tf.qs0.07
Table 3 DUCT HEAT RECLAIM COILS SIZE AND FACE AREA TYPE KC
"W""W"
"W""W" )SEHCNI(-LTN-HTGNELEBUTLANIMON)SEHCNI(-LTN-HTGNELEBUTLANIMON
"W"
SEHCNISEHCNI
SEHCNISEHCNI21212121215151515151818181818112121212124242424242030303030363636363632424242424848484848445454545450606060606666666666627272727278787878787484848484809090909096969696969201201
SEHCNI
66666
99999
2121212121
5151515151
8181818181
1212121212
4242424242
7272727272
0303030303
3333333333
6363636363
9393939393
2424242424
Face Tubes in Condenser Type Duct Coils = (
05.26.57.78.00.152.105.157.10.22.25.27.20.3
57.49.21.113.105.178.152.226.20.34.37.31.45.4
00.152.105.157.100.205.200.305.30.45.40.55.50.65.60.75.70.85.80.95.90.01
65.178.191.205.221.357.373.40.56.52.69.65.71.87.84.90.016.012.119.115.21
52.226.200.357.305.452.50.67.65.72.80.97.95.012.110.217.215.312.410.51
60.305.373.452.521.60.79.77.86.95.014.112.211.310.419.417.516.615.71
00.400.500.600.70.80.90.010.110.210.310.410.510.610.710.810.910.02
3
26.557.678.70.91.012.114.215.316.417.519.610.811.912.024.125.22
52.605.757.80.012.115.217.310.512.615.717.810.022.125.227.320.52
52.826.90.114.217.311.515.619.712.916.020.224.327.421.625.72
00.905.010.215.310.515.610.815.910.125.220.425.520.725.820.03
73.110.316.412.619.715.911.027.224.420.626.722.929.035.23
52.210.417.515.712.910.127.225.422.620.827.925.132.330.53
‘w’
x 2) 3 & 4 Row Desuperheater Type Coils have one Face Tube less than Condenser Coils.
- 3 -
)SEHCNI(-LTN-HTGNELEBUTLANIMON)SEHCNI(-LTN-HTGNELEBUTLANIMON
)SEHCNI(-LTN-HTGNELEBUTLANIMON
201201801801
201
801801411411
801
411411021021
411
021021
021
HEAT RECLAIM COIL PERFORMANCE 1/2” O.D. TUBE
CHART 1
HEAT RECLAIM COIL PERFORMANCE 1/2” O.D. TUBE
CHART 2
- 4 -
40
30
20
BTU/H - C.F.M.
40
30
BTU/H - C.F.M.
20
10
300 400 500 600 700 800
FACE VELOCITY, F .P.M. FACE VELOCITY, F .P.M.
10
300 400 500 600 700 800
HEAT RECLAIM COIL PERFORMANCE 1/2” O.D. TUBE
CHART 3
50
HEAT RECLAIM COIL PERFORMANCE 1/2” O.D. TUBE
CHART 4
60
- 5 -
40
30
20
BTU/H - C.F.M.
50
BTU/H - C.F.M.
40
30
10
300 400 500 600 700 800
FACE VELOCITY, F .P.M. FACE VELOCITY, F .P.M.
20
300 400 500 600 700 800
HEAT RECLAIM COIL PERFORMANCE 1/2” O.D. TUBE
CHART 5
60
50
BTU/H - C.F.M.
HEAT REJECTION FACTORS SUCTION COOLED
SEMI-HERMATIC COMPRESSORS
CHART 6
- 6 -
40
30
20
300 400 500 600 700
FACE VELOCITY, F .P.M.
CONDENSING TEMPERATURE °F.
CHART 7
h/UTB.rh/UTB
h/UTB
h/UTB.rh/UTB
INCHES OF WATER
FACE VELOCITY F.P.M.
COIL AIR SIDE PRESSURE LOSS
.90
.80
.70
.60
.50
.40
NOTE: For Multi Circuit Applications Enter
Columns (1) through (6). Then enter total under (7) and
follow items (8) through (17).
Customer
Coil Air Handler Size Coil
Type: H.R. Insert and Type
K.C. Bolt-On Condenser
K.C. Duct Coil size
Total C.F.M.
(1) (2) (3) (4) (5) (6) (15) (16) (17)
.pmoC.pmoC
.pmoC.pmoC
.pmoC
.oN
1111102+02+
2222201+01+
3333353+53+
4444402-02-
5555502-02-
6666602-02-
† For desuperheater type coil BTU/hr, for
Heat Reclaim will be a percentage of
compressor heat.
(8) Coil Face Velocity =
(9) Coil Performance req’d. =
C.F.M.
John Doe
21,540
Ent. Air temp.
.tcuS.tcuS
.tcuS.tcuS
.tcuS
.F.pmeT
02+02+2121212121000,06000,06
02+
01+01+2121212121005,73005,73
01+
53+53+2121212121000,55000,55
53+
02-02-205205
02-
02-02-205205
02-
02-02-205205
02-
.30
CONDENSER HEAT RECLAIM COIL SELECTION
Project
.feR.feR
.feR.feR
.feR
epyT
205205000,03000,03
205
205205005,73005,73
205
205205000,53000,53
205
Total Heat reclaim (7)
.25
.20
48
.rh/UTB.rh/UTB
.rh/UTB.rh/UTB
.rh/UTB
yticapaC
000,06000,0633.133.1
000,06
005,73005,7343.143.1
005,73
000,55000,5562.162.1
000,55
000,03000,0395.195.1
000,03
005,73005,7395.195.1
005,73
000,53000,5395.195.1
000,53
600
F.P.M.
.15
LS 237
107 1/2
x
65
°F Design T.D.
=
.10
.09
.08
.07
.06
.05
.04
For single circuit applications enter total load under (7) and
then follow items (8) through (13).
Food Store
rotcaFrotcaF
rotcaFrotcaF
rotcaF
33.133.1008,97008,97
33.1
43.143.1521,25521,25
43.1
62.162.1003,96003,96
62.1
95.195.1007,74007,74
95.1
95.195.1526,95526,95
95.1
95.195.1056,55056,55
95.1
=mialceR)7(taeHlatoT=mialceR)7(taeHlatoT
=mialceR)7(taeHlatoT=mialceR)7(taeHlatoT
=mialceR)7(taeHlatoT
Date
Application: Desuperheater
)6trahC(
.r
.r
.r
taeH
mialceR
008,97008,97217,11217,11
008,97
521,25521,25217,11217,11
521,25
003,96003,96217,11217,11
003,96
007,74007,74217,11217,11
007,74
526,95526,95217,11217,11
526,95
056,55056,55217,11217,11
056,55
002,463002,463
002,463002,463
002,463
364,200
21,540
Face Area
.rh/UTB.rh/UTB
.rh/UTB.rh/UTB
.rh/UTB
217,11217,1118.618.6
217,11
217,11217,1154.454.4
217,11
217,11217,1129.529.5
217,11
217,11217,1170.470.4
217,11
217,11217,1190.590.5
217,11
217,11217,1157.457.4
217,11
16.9
=
BTUhr/C.F.M.
45
ebuTecaFreP
.035
.03
35.9
sq. ft.
°F.
sebuTecaFsebuTecaF
sebuTecaFsebuTecaF
sebuTecaF
.d’qeR
18.618.677777
18.6
54.454.455555
54.4
29.529.566666
29.5
70.470.444444
70.4
90.590.555555
90.5
57.457.455555
57.4
=)81(ecafnisebuTlatoT=)81(ecafnisebuTlatoT
=)81(ecafnisebuTlatoT=)81(ecafnisebuTlatoT
=)81(ecafnisebuTlatoT
.025
desU
2323232323
200 250 300 400 500 600 700 800 1000
.02
sebuTecaFsebuTecaF
sebuTecaFsebuTecaF
sebuTecaF
TYPICAL REFRIGERATION HEAT RECLAIM CALCULATION
(10) Select from performance Charts at
design T.D. coil nearest to (9) above = Rows:
(11) Max. capacity of Coil = BTUhr/C.F.M. (10) X C.F.M.
=
(12) Actual operating T.D.
(13) Determine No. of Face Tubes in coil (Tables 1 or 2) =
(14) Determine Capacity per face tube =
Now complete columns 16 & 17
Final coil selection Rows 2 F.P.I. 10 48 Ins. X 107 1/2 Ins.
Air side Pressure drop = .15 Inches of Water (Chart 7)
= Performance req’d. (9)
=
17.4 X 21,540 = 374,796 BTU/hr
Performance from (10)
16.9
17.4
Max. Capacity BTU hr. (11)
=
374,796
No. of face tubes (13)
2
X 45 °F = 43.7 T.D.
=
32
F.P.I.
X Design T.D.
10
11,712 BTU/hr
(Enter Under 15)
=
17.4
BTUhr/C.F.M.
32
Tubes (Enter in 18 above)
- 7 -
CONDENSER HEA T RECLAIM COIL SELECTION
US
C
03/17/07
NOTE: For Multi Circuit Applications Enter
Columns (1) through (6). Then enter total under (7) and
follow items (8) through (17).
Suct.
Project
Ent. Air temp. °F Design T.D.
Ref.
Type
BTU/hr.
Capacity
Customer
Coil Air Handler Size Coil
Type: H.R. Insert and Type
K.C. Bolt-On Condenser
K.C. Duct Coil size
Total C.F.M.
(1) (2) (3) (4) (5) (6) (15) (16) (17)
Comp.
No.
Tem p . °F.
x
Factor
(Ch art 6 )
For single circuit applications enter total load under (7) and
then follow items (8) through (13).
Date
Application: Desuperheater
Face Area
BTU/hr.
Heat
Reclaim
BTU/hr.
Per Face
Tube
sq. ft.
°F.
Face Tubes
Req'd.
Face Tubes
Used
† For desuperheater type coil BTU/hr, for
Heat Reclaim will be a percentage of
compressor heat.
(8) Coil Face Velocity =
(9) Coil Performance req’d. =
(10) Select from performance Charts at
design T.D. coil nearest to (9) above = Rows:
(11) Max. capacity of Coil = BTUhr/C.F.M. (10) X C.F.M.
= X = BTU/hr
(12) Actual operating T.D.
Performance from (10)
(13) Determine No. of Face Tubes in coil (Tables 1 or 2) =
(14) Determine Capacity per face tube =
C.F.M.
Now complete columns 16 & 17
Final coil selection Rows F.P.I. Ins. X Ins.
Air side Pressure drop = Inches of Water (Chart 7)
Total Heat (7) Reclaim = Total Tubes in face (18) =
= Performance req’d. (9)
=
F.P.M.
Total Heat reclaim (7)
X
=
F.P.I.
X Design T.D.
= BTUhr/C.F.M.
= BTUhr/C.F.M.
°F = T.D.
Tubes (Enter in 18 above)
Max. Capacity BTU hr. (11)
No. of face tubes (13)
= =
BTU/hr
(Enter Under 15)
NA TIONAL REFRIGERA TION &
AIR CONDITIONING CANADA CORP.
CANADA
159 ROY BL VD., BRANTFORD, ONT ARIO, CANADA N3R 7K1
PHONE: 1-800-463-9517 (519)751-0444 FAX (519)753-1140
Due to National Refrigeration’s policy of continuous product improvement, we reserve the right to make changes without notice.
USA
985 WHEELER WA Y, LANGHORNE, PA. 19047 USA
PHONE:1-888-KEEPUS1 OR 1-888-533-7871
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