14
2.3 - Chiller flowchart and component function
description
evaporator
The refrigerant is dispersed on the heat transfer tubes of the
evaporator. Chilled water running through the heat transfer
tubes of evaporator is cooled by the latent heat of vaporized
refrigerant.
absorber
The concentrated solution is dispersed on the heat transfer
tubes of absorber. The refrigerant vapour from the evaporator is
absorbed on the heat transfer tubes of the absorber by the
concentrated solution. Cooling water running through the heat
transfer tubes of the absorber is heated by the absorption heat.
solution heat exchangers
In order to increase the efficiency of the chiller, two solution
heat exchangers are provided. One is a low-temperature heat
exchanger and the other is a high-temperature heat exchanger.
In the low-temperature heat exchanger, heat exchange takes
place between the concentrated solution and the diluted solution.
In the high-temperature heat exchanger, heat exchange takes
place between the intermediate solution and the diluted solution.
High-temperature generator
The diluted solution from the high-temperature heat exchanger
is heated and releases refrigerant vapour. It then changes to the
intermediate solution.
low-temperature generator
The refrigerant vapour from the high-temperature generator
passes through the heat transfer tubes of the low-temperature
generator. The intermediate solution in the low-temperature
generator is heated by the refrigerant vapour. It releases refrigerant
vapour and is concentrated. It changes to the concentrated
solution. The condensed refrigerant in the heat transfer tubes of
the low-temperature generator flows to the condenser.
condenser
The refrigerant vapour from the generator is condensed on the
heat transfer tubes of the condenser. Cooling water from the
absorber is heated by condensation heat.
Purge unit
The purge unit collects the non-condensable gas in the chiller
and stores it in the purge tank.
refrigerant drain heat reclaimer
This heat exchanger is provided in order to increase the
efficiency of the chiller. In this heat reclaimer heat exchange
takes place between the diluted solution and the condensed
refrigerant from the low-temperature generator.
High and low-temperature heat reclaimers
These heat reclaimers are provided in order to recover heat
from the steam drain, In these heat reclaimers heat exchange
takes place between the diluted solution and the steam drain.
sensors
symbol
Name
DT1
Chilled-water leaving temperature
DT3
High-temperature generator temperature
DT4
Low-temperature generator temperature
DT5
Condenser temperature
DT6
Chilled-water entering temperature
DT7
Cooling water entering temperature
DT8
Cooling water intermediate temperature
DT9
Cooling water leaving temperature
DT11
Evaporator refrigerant temperature
DT12
Diluted solution temperature sensor at absorber outlet
DT13
Steam drain temperature
E1-3
High-temperature generator solution level electrode
63CH
High-temperature generator pressure switch
69CH
Chilled water flow switch
69PR
Purge tank pressure switch
