McQuay DC-U Installation Manual

MGQumi”

Absorption Chiller/Heater

Operation and

Maintenance Data

Bulletin No. OM 114

March, 1993

Form No. 573442Y

DC-U Model

I

/

NOTESTO USERS

1 . Before operating this chiller/heater, You should first thoroughly

read this manual.
You may not
you firstly read this booklet, however, please strictly follow the
directions as drown hereinafter.

3. Be sure not to leak the airinto the chiller/heater atany
(Take care when You handle the manual purge valves and service

valves. )

4 . Perform sufficiet ventilation in the machine room.

Required fresh airratefor combustion;

Approximately 1.2 m3/h (43 ft3/h) per fuel

1,000 kcal/h (4,000 But/h) .

5 . If You smell gas in the machine room, stop the chiller/heater

immediately and close the main gas cock, then advise thesituation

toour agency assoon aspossible.

When you could find out theleak point you maytemporarily rectify
it.

understand all of the explanations foroperations when

consumption of

I

cases.

7 . Keep the operation of chilled water pump(s) and air handling unit(s)

even when chiller/heater runs into dilution cycle operation, to
avoid damage of the chiller/heater caused by over cooling or any
other unusual situation.

(Diluted cycle operation)
normal operation or at emergency,
working until the density of the absorbent comes to a specified
value. )

8 . Before operating the chiller/hinter on the beginning of cooling OF

heating season, it shall be assured that the Cooling/heating change
over procedure inaccordance

9 . Specifications and equipment may be changed as required by the

manufacture without any notice and obligation tothe users.

: When the chiller/heater is stopped under

the chiller/heater continues its

with Section 3.3 has been made.

814-6-0502-449-01

(HMTKYIMWUtK

CONTENTS

Page No.

SEmON 1

;:;

1.3

1.4

SUXON 3

3.1

3.2

3.3

3.4

3.5

3.6

NYIES ‘R) m--------------------------------------------------------------

GmwRALDE92UPTION------------------------------------------------------1

m FRIWPLE OF MHIRI1-roN -----------------------------------------2
(XIOHNG/HE4TIlKCYUE DIHRIFI’ION ------------------------------20
U-IIIllR/HE41TR IIJMJRATKM.I-----------------------------------------25

SAFEIYDEvm --------------------------------------------------------------37

WERATION ----------------------------------------------------------------------39

OPIRATIONDIRD -----------------------------------------------------------40
lRdFfRAluRE SEXTING“----”-------”--”------------------------------------ 43
fEJ?-DIAGNOH’ICSRINCMRJ -------------------------------------------51
FIWARATIONFOR HART UP-----------------------------------------------54
OPJMTION ---------------------------------------------------------------------58

MmnmANm
DAILYh9AMlmIMXz '---"---"----------------------------"---------"----"----73

SASCNALMAINIHWMX-----------------------------------------------------75
UXHJNG/HEATING(l-l/ME OVIR -----------------------------------------80
WATFR‘IREAM ------------------------------------------------------------82
M41NllMME m
PARTSlNSfK1’ION------------------------------------------------------------89

~`"-------------" -"-"--"-""----------------------86

72

i

ii

mm 4 ‘IROuBU9-IOOTING------------------------------------------------------------91

4.1 ALARMINDICATIONIMP ---------------------------------------------------92

4.2 K3WlR FAILURE---------------------------------------------------------------94

4.3 ALARMIN ‘II-WCOOLINGOFIRAT~ -------------------------------------95

4.4 ALARMIN ‘IHE HEATINGOPERATION-------------------------------------98

4.5 ALARMTIME ~------------------------------------------------------------lOl

SECTION1 GENERAI-DESCRIPTION

CONTENTS

Page No.

SECTION1

1.1

1.2 (lXILIIW/HEATINGCYCLEDEWWTION

1.3 CWJJIR/HEAIERIiLUSIRATION

GENERALDE!XRIPTION

THEPRINCIPLEOF AES3RPTION

(1) ~ ~A

(2) ~pRI~I~ @ ~r~ ....................................... q

(3) SINGLEEmmT TYPE (BASICCYUE)

(~] m m ~ .................................................... ;

(~) ~~~ ~A~ .............................................................. 9

(~) “Am .....................................................................lo

(7) LIIHUMBROMIDE(LiBr

(8) ~~~ ~~ ............................................................l6

(9) HEATINGCYCLE--------------------------------------------------------------19

( 1) mIM mm -------------------------------------------------------------2O
(2) WTIM am -------------------------------------------------------------24

~TI~ ~1~ ? . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . ~

............................................

............

: ABWWENT)--”---”------”--------””-----11

................................

------------------------------------------25

...........

... ..........

.............

1

2

20

(1) ILLUSTRATION
(2) DETAIT@ TYPICAL~IWWm(mm VIEW) ------- 26

(3) DETAITOF TYPICAL(llIUJZR/HEAllR(REARVIEW)---------- 27
(4) ~AIT w ~Im ~Iw~~(RI~ Vim) ------- 28
(5) ~AIT OF TYPICALGIILJ.JWHE4TER(IJFTVIEW)-----------29
(6) TYPICAL~= pm -----------------------:----------------------30
(7) TYPICALBURNER,GAS‘IRAINANDB. CONTPANEL-----------32

(8) m .......................................................................34

1.4 S4FETYDEVICES---------------------------------------------------------------37

(XII.UD/HOTWATERANo~1~ WA~ ..........................37

(1)

~~~ ~~ -TfJR ......................................37

(2)

BURNER---------------------------------------------------------------------38

(3)

MOTUR--------------------------------------------------------------------------38

(4)

U1’HRS ------------------------------------------------------------------------38

(5)

--------------------------------------------------------------25

—l–

1.1 THEPRINCIPLEOFABSORPTION

(1) WHY DOES A HEATINGCHILL ?

I

The cooling means keeping the room temperature lower than outside temperature. AS
shown Fig.1-1, operate to carry the heat from the room with a lower temperature (28”C,
82”F) to the open air with a higher temperature is required.
heat cannot move from alowtemperature side toahigh temperature side. So, to
transmit the heat as oppposed to this law (principle), some way (apparatus) is

necessary.

That is, a heat pump (chiller) is used topump out thehear from low

temperature one asifawater pump isused todraw upthewater from adeep well.

But, in the nature, the

IU l~C AI I-IUGU-I-U

COOLING LOAD

(82 “F) (90 ‘F)

AIR CONDITIONER

FIG . 1-1 HEAT FLOW

+

HEAT FLOW

–2–

The typical c+iller using an electric as a operation
curry the heat in Fig.1-2 is an electric turbo chiller
heat energy is an absorption chiller.

power source as a conveyer to

and the typical chiller using a

Chilled water is made by using the latent hear released byaliquid asitevaporates.
We can find this principle through our experience in a daily life.
having an injection, after applying as alcohol for disinfection on the arm, we feel

thepartofarm cool..

heat from thearmwhen itevaporates.
we sweat in a hot day or bytaking exercise.
automatically controlled by the evaporation of sweat which takes theheat fromthe

body.
necessary to return to liquid for using vaporized liquid.

compressor is used in anelectric turbo chiller and anabsorbent isusedin an
absorption

The

absorbing the vaporized solution. To recover
concentrating Process of the absorbentis required.
natural gas, steam or hot water.

A chiller also uses an latent heat of evaporation

chiller.

absorbent decrease

Because. the alcohol is heated by body's temperature. took the

And another sample is that we feel cool when

Because, the body temperature

But in a chiller, it is

the absorption power when it becomes diluted solution by

the absorption power, the heating and

Asheat source itis used by

For example, when

For this purpose, the

n

:&KOWEIJ:PERATIRE SIDE

I

A GRAIN OF HEAT

FIG .1-2 HEAT FLOW AT CJ30UNG

iv

HIGHER TEt4PERATuRE

ENERGY

SIDE

–3–

(2) TI-E PRlNCIPLE OF ABSORPTION

Install heat transfer tubes in a closed vessel and put a dry silicagel (Silicagel is
high quality absorbent material) in it as shown Fig.l -3.
vessel tomake avacuum

with the pressure

of approx. 6.5mmHg (1/4 inchHg). Drops of

water are allowed to fall on the heat transfer tubes (Evaporator).
vacuum vessel evaporates at5-C (41 ‘F) .

The water takes an evaporation heat from the

water intheheat transfer tubes, when it become vapor.

Take out an air in the

The water in the

(Such liquid is called a

refrigerant and shown as a refrigerant liquid or a refrigerant vapor for the
following. )

silicagel, a vacuum

As this evaporated refrigerant vapor is absorbed immediately by a

is kept inside the vessel.

Onthe other hand. the water in the

heat transfer tubes becomes chilled because the heat equivalent to the exaporation
heat is taken.

impossible to keep a vacuum

But, when the silicagel reaches the limit of absorptiono it

in the vessel and chilled water can not be obtained.

WATER

(REFRIGERANT)

is

CHILLED
WATER

WATER

tiEAT

I k P’=

~lcAGEL

TRANSFER
TUBE

FIG. 1-3

–4–

lherefore, replacing a silicagel as absorbent

lithiu

times permits to get chilled water continuously.
solid absorbent such asasilicagel,
bromide (LiBr) solution, etc. is used.

a liquid absorbent such as easy-to-handle

(Such liquid is called an absorbent.) This

case is shown Fig.l -4.

REFR~GERANT VAPOR

CHILLED
WATER

in the vessel with new one at all

For this purpose, instead ofthe

DRIVING
HEAT
SOUCE

WATER

‘+31LUTED

SOLUTION

FIG. 1-4

–5–

Drops ofLiBr solution are allowed
solution absorbs refrigerant vapor.

refrigerant vapor, it is diluted and decreases
chilled water can not be obtained.

in continuously.

At this stage, the diluted solution isheated bydriving heat

to fall (Absorber) inside the vessel. The LiBr

But, when the absorbent once absorbs the

ability to absorb. Resulting in the

This means that concentrated solution must be fed

source (natural gas, steam orhot water:Generator). The heat causes thesolution to
release the absorbed refrigerant and also

reconcentrates the solution.

The refrigerant vapor which is relased from the solution when heated is cooled in a

seperate vessel (Condenser) tobecome

liquid refrigemnt.

Drops of this water are

again introduced into the vacuum vessel and recyled. This is shown Fig.l -5.

COOLIN
WATER

e ~R;ING

FIG. 1-5

Put@

C=

SOUCE

(3] SINGLE EFFECT TYPE (BASIC CYCLE)

AS * Fig.l -6.
absorption chiller.

shows an evaporator

Cooling water flows
condenser—cools the
cooling water in the absorber absorbs the heat when the refrigerant vapor is absorbed
by the absorbent.

The generator 0 heats the diluted solution by driving heat source.
solution releases the refrigerant vapor and becomes the concentrated solution.

Atthe condenser (2),the refrierant vapor which came from thegenerator condensed by
cooling water.

The condensed refrigerant drops onthe heat transfer tubes ofevaporator(3).Drops
of the refrigerant evaporate on the tubes.
of evaporator is cooled by the latent heat of vaporized refrigerant.

f--=--n

,— . .

The water Through the heat transfer tubes

The diluted

/?h@

COWING 1-, -

c=-&-=s /.” ”-w

WATE

~.\

I*-=

d

‘----’’--”=44 ~

CHILLED
WATER

WATER

(“~>” ‘ “ ‘WATER

COOLING

FIG. 1-6

—7–

(4) DOU8LE EFFECT TYPE

In case of the single effect type absorption chiller mentioned above

heat when the refrigerant vapor coming from generator is cooled and

all condensation

condensed at the

condenser, is released in the cooling water.

The double effect type absorption chiller is used
The generator section is divided into a high

temperature generator.

The refrigerant vapor

generator is used to heat the LiBr solution in the

temperature generator and a low

produced by the high temperature

low temperature generator in which

heat effectively.

the pressure (hence the boiling point) is lower.

As mentioned in the single effect type, the refrigerant vapor produced by the low
temperature generator issent tothe condenser

to become liquid refrigerant. On the

other hand, the refrigerant vapor produced by the high temperature generator turns to
water as it released heat to the intermediate LiBr solutitn.
heat transfer tubes in the low temperature generator.

The refrigerant vapor produced

This occurs inside the

by both low and high temperature generators turns to liquid refrigerant and mixes in
the condenser before returning to the evaporator.

In this step, the diluted solution is heated by driving heat source by the latent
heat in the refrigerant vapor which otherwise would be released into the cooling
water.

This combinatiom means a lower energy consumption of driving heat source.
Moreover, less heat being discarded into the ceding water translates into a small
cooling tower. As shown Fig.1-7.

‘~ ‘-\ a GENERATCR

LDW TEMPERATL8?E

@ -x~ ‘-

DRIVING
HEAT

–8–

(5) COOLIK WATER

Cooling water flows through an absorber and a condenser.
The cooling water takes the heat which the LiBr solution absobs the refrigerant vapor
at absorber.

This means the aborbent is cooled by cooling water.

The refrigerant vapor from the generator is cooled by cooling water.

The lower temperate of cooling water

a)

The absorption power of LiBr solution is strong at the lower temperature
cooling water.
condensed temperature of refrigerant downs.

low.

AS the boiling temperature (generator temperature) of the LiBr solution downs

when the condensed

decrease.

It is not acceptable

b)

This means save energy.

As shown Fig.1-8, a
LiBr solution of
temperature. For

When the temperature ofcooling water inthe condenser

Therefore condensed pressure

pressure is low, calolific value of driving heat source can

that the temperature of cooling water is too low.

few LiBr dissolves with water at low temperature.
high concentration becomes crystallization under the lower

example, it is crystallized with concentration” of 65% at the

temperature lower then 42C (108F) with concentration of 60%

lower than 17C (63°F).

Chiller has some problems when cooling water temperature becomes too high

c)

When the temperature of the cooling water becomes high, the absorption power of the
LiBr solution decreases.

temperature and wastes much fuel.

The chiller can not get the normal chilled water

Therefore. to prevent this, the maintenance for

cooling water system (equipment and control) and water treatment are required.

of the

is low.

becomes

lhat is, the

at the temperature

d)

Water treatment of

cooling water

The water treatment of the cooling water is an important factor for the chiller. If
the water quality is no good, scale adheres to the inside of the heat transfer tubes,
resulting in the decreases transfer heat effect and waste fuel.

Asthe heat transfer

tubes may become corroded, itisrequired to fully take care of the water treatment.

–9–

(6) VACUUM

Onthe earth, wearepressed by the air.
pressure (1 kg/cm2, 14.2psi). The pressure

the vacuum.

know the relation between the pressure

lt is experienced in a daiily life that the water is boiled (evaporated) at 100C

(212”F) in theatmospheric pressure.
pressure
between the pressure

Ihe
Therefore, the inside the chiller should be always kept in high vacuum.
refrigerant is evaporated at 5C (41 oF) to get the chilled water of 7C (45F) by an

absorption chiller,

6.54mmHg(1/4 inchHg) in the evaporator.

(

water is evaporated at lower temperature, when the pressure

When explaining the vacuum

vacuum), the water boiled below 100C (210”F). Table 1-1 shows the relation

and the evaporation temperature.

it is required to keep a high-vacuum condition with

Table 1-1

Gauge
pressure pressure
kgh’e

(psig)

Absolute

mldk

(inchM)

for the absorption chiller. it is required to

and the

When the pressure

This pressure

less than atmospheric pressure

evaporation t.emperature o the water.

is lower than the atmospheric

is called atmospheric

is called

is lower and lower.

Sines the

Pressure

of

10 (142)

8 (114)
Atmospheric
pressure 1 (14.2)

u

1 ata.

n

Yacmm

5 ( 71)

0.5 ( 7.2)

o (o) 760(29. 9)

Driving pressure for double effect type

Driving pressure for single effect type

Atwpheri c pressure

525.9 (2&3/4)

61.0 ( 2-3/8) Pressure in the condenser

9.2 ( 3/8)

6.54( 1/4) Pressure in the waporator

I

I

–lo–

(7) LITYIUM BROMIDE (LiBr : ABSORBENT)

Lithium bromide (LiBr) is a medicine made from lithium obtained from lithium ore and
bromide obtained from the sea water.
with sodium chloride (NaCl) .

Because lithium (Li) and sodium (Na) are alkali while

brumide (Br) and chlorine (Cl) are halcgen.

The lithium bromide has the same characteristic

the sodium chloride (Ml) is salt. It

is well known that when salt is left in a high-humidity atmosphere. it becomes sticky.

This means it absorbs moisture in the atmosphere.

The lithium bromide has the same

characteristics and its absorption power is Stronger than that of salt.

its concentration and the lower itstemperature of liquid. thestronger the absorption

power.

Fig.1-8 shows the lithium bromide equilibrium diagram.
Fig.1-9 shows the lithium bromide concentration diagram.
Fig.1-l0 shows the lithium bromide DUhring diagram.

This chart is convenient to show

thecondition of the cooling cycle of lithium bromide solution.

Fig.1-l1 shows the lithium bromide enthalpy diagram.

Ihe higher

Lithium bromide has corrosive action to a metal under existing oxygen.
absorption chiller is a vacuum vessel, almost no oxygen is in a vessel.

But, as the

However, to
make more complete, corrosion inhibitor is added in the absorbent and further
alkalinity is adjusted.

So, attention should be taken to handle the absorbent and it

isnecessary to keep the amount of inhibitor by performing the chemical analysis for

the absorbent.

Chemical formula : Li13r
Molecular weight : 86.856

Component

: Li= 7.99%

Br=92.01%

Specific gravity : 3.464 at25C (77”F)

Melting

Boiling point : 1,265C

point :

549C ( 1,020.2”F)

(2,309Φ)

–11–

(“F)

2!2
200

(“c)

I 00

17!5

150

125

10C

5(

x

80

60

40 ‘

20

0

-20

-lo

-2!

-4(

-5’

-7

-40

-60

-80
10

20

CONCENTRATION (X)

FIG.1-8 LIBR

30

EOILIBRI~ DIAGRAM

40

50

60

–12–

TEMPERATURE

1.90°

1.85

1.80

1.75

1.70

32 50

10

-

75

I

I

100

I

125

I

150

I

20 30 40 50 60 70 80 90

I I

175

I

1

200 212(”FI

I

1OO(”C)

I

67

66

65

64

63

62

61

60

I

1.65

1.60

1.55

1.50

1.45

1.401

59

58

m

57

56

l=+

1

I

55
54
53
52

-1

51
50
49
48
47

46
45

0

10 20 30 40 50 60 70 80 90

100[”CI

32 50 75

FIG.

100 125 150

TEt@ERATURE

1-9 CDNCENTRATICN DIAGRAM

–13–

175

200 212(”F)

;::

500

400

300

200

160

!cm

f30

50
40

30

‘z

J21

20

10

8

5

0

32 40

10 20 30 40 50 60 70 80 90

60

80

100

120 140 160

TEMPERATURE

FIG.1-10

180 200

DUHRINGDIAGRAM

100 110 120

220

240

260

130

280

140

150

160

300 320

170(”C)

338(°F)

150

140

130

120

110

— 160

100

90

k -.

80

70

60

170

50

40

40

45 50

FIG.1-11 ENTHALPY DIAGRAM

55

CONCENTRATION (%)

–15–

60

65

70

r

(8) COOLING CYCLE

An example for the actual driving cycle of double effect type is explained using the
Duhring diagram.

A Bshows the absorption process in theabsorber.

a)

The absorbent with concen-

tration of 63.6% at point A absorbs the refrigerant vapor from the evaporator as it is
cooled until 36.3-C (97.3”F) by cooling water, then becomes diluted solution with
concentration of 58.1% at point B.

The pressure of this point is 6.31mmHg(torr) which is equal to the saturation vapor
pressure of water at 4.3C (39.7°F) (cross point on
the chilled water at 7C (44.6°F) can be produced in

Therefore, the higher the temperature of the cooling

internal pressure (equal to the evaporator internal

evaporation temperature of refrigerant becomes high

the saturation liquid line) , so,

the evaporator.

water, the higher the absorber

pressure) .

As a result, the

and chilled water can not be

obtained.

B+ C+ D”shows the temperature rise

b)

process under the fixed concentration when

the diluted solution pass through the low

D’+D+E shows the heating and concentrating process inthe high temperature

c)

generator..

The diluted solution at point D’ is heated until point D.

the refrigerant vapor and

is concentrated. Then it becomes the intermediate

It releases

solution of 61.1% at point E and finishes the first stage of concentrating.

The pressure at point E becomes approx. 707.lmmHg(torr).
the pressure of 55.7mmHg(torr) in the condenser
temperature of cooling water.

That is, the pressure inside the low temperature

determining it according to the

(This pressure

depends on

generator has to be performed at the temperature higher than 91.1C(196”F) of the

concentrated solution obtained from the cross point with the concentrated solution
of 63.6%. Whensetting to 97.9C (208.2 “F) by making this as AT 6.8C (12.2”F) , the
pressure of the high temperature generator becomes 707.lmmHg(torr).

d)

--16–

e

absorbent with 61.1% at point F’ is heated by the refrigerant vapor from the
temperature generator.

concentration rises, and it becomes the concentrated solution of 63.6%. thus
second stage of the concentration is finished.

As a result.

the refrigerant vapor is generated.

F+F+Gshows the

The

high

the
the

conce

The pressure at point G is determined by the temperature of the cooling water.
the condensation temperature of 40.2C (104.4”F). the

pressure of this temperature. 55.7mmHg(torr).

f)

A’+Ashows that the concentrated solution enters the absorber and iscooled bythe

g)

decrease ofpressure and

vapor from point A; this cycle is repeated again.

Asdescribed above, itcanbeunderstood that the cycle of the absorption cooling
system depends onthe temperature condition (partially dertermination element from the

taking out temperature of the chilled water).

With

pressureis thesaturated vapor

thecooling water, then starts toabsorb the refrigerant

–17–

w

-1

cl

z

-1

t-

ti

-. —

v,

m“

.,

CfJ

u

e

C6
u

—18—

.-,

m

It+

HEATING CYCLE

(9)

The diluted solution is heated in the high temperature generator.

The refrigerant
vapor is released from absorbent.
The refrigerant vapor flows to absorber through the change over valve.
refrigerant vapor

condenses on the heat transfer tubes of evaporator. The condensed

The

refrigerant is mixed with the concentrated solution from the generator, and the

absorbent becomes diluted solution.

The absorbent flows back to the high temperature

generator, and it repeats the role.

ER

LtM W.
~TU?

m

HOT

w

t

FIG. f-13

–19–

I

N

7’

6

G

I

CHILLED

INLET

PURGE I
UNIT

I

I

t

COOLING WATER I )
OUIL T—

t

II
Ii n JJ15Ld

—

I

I

I
I
I

I

I
I

I

I

L!Kx__d3cH

mcoNcENTRATEO SOLUTION

=INTERMEo IATE SOLUTION

~~OILUTEO SOLUTION

REFRIGERANT PUMP

012

n I

Cotjofi

. . . . . .

L

/wl

/

/

B VALVE

1

[-J REFRIGERANT

[-] REFRIGERANT VAPOR

I I

——

——_

“T

LOW TEMP. GENERATOR

I

.< ‘ “

w

DT 7

‘P

_+

——

——

—

——— __

—

— — _ _ _ _—_—_—_

t

COOLING WATER’

LuL___

L 81 ABSORBENT PUMP

~OPEN

MCLOSE

..

1-

63GH ~

(II

km

I
I
I

I
I

I

I

I

I
I
I

REa_Ns

—

—

—

—

—

——

—_ ___ ___ _

—-l

—

— —

I

I
I
I
I
I

-H ‘

G ‘xcHANG”-

(THIS PUMP IS PRC)VIOEO ON

MOOEL OC-23 TO OC-83 ONLY)

LOW TEMP.

HEAT EXCHANGER

FIG. 1-14 COOLING FLOW CHART

Evapaator

a)

The refrigerant isdispersed on the heat transfer
through the heat transfer tubes ofevaporator
vaporized

Absorber

b)

refrigerant.

tubes of evaporator.

Chilled water

is cooled by the latent beat of

FIG. I-15

–21–

low temperature

the

diluted solution

The

high temperature

the

diluted solution

The

heat

after

heat

after

leaving the high temperature heat exchanger flows to the high temperature generator.

FIG. I-16

The diluted slution from the heat exchangers

is heated in the high temperature

generator. It releases therefrigerantvapor and is concentrated.

intermediate

solution.

It becomes

EiG.l -17

–22–

The refrigerant vapor from the high temperature passes through the heat
transfer

temperature generator is

tubes of low temperature generator.

heated by the refrigerant vapor.

refrigerant vapor and is concentrated.

The intermediate solution in the low

It releases the

lt becomes concentrated solution. The

condensed refrigerant in the heat transfer tube of low temperature generator flows to

the condenser.

f)Condenser

The refrigerant vapor from the low temperature
transfer tubes ofcondenser.

Cooling water

condensation heat.

generator is condensed

from the absorber isheated by

onthe heat

FIG.1-18

–23–

( 2) HEATING CYCLE

The vaporized refrigemnt at the high temperature generator flows to absorber through
the A valve (cool/heat change over valve).

—.-

transfer tubes of evaporator.

heat

Hot water through the heat

The refrigerant condenseson the

transfer tubes of

evaporator is heated by sensible heat of condensed refrigerant.

Svfl

‘HX3

m

:

k——————— —

‘? ?

———————

.

v>y\\.,..\\\\\\.>\\\.\

il

\

.
.
B

0

——T

I

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