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| Absorption chiller |
Capacity of absorption chillers needs to be adjusted with respect to load on HVAC water chillers.Capacity control of HVAC chillers is very logical and required to save the input energy at low or part-load on chillers.
Chillers
providing absorption cooling use different types of input energy.Absorption chillers
are generally controlled from input energy being provided to generator(single effect absorption chillers) or high pressure generator (double effect absorption chillers).
How capacity of absorption Chillers is controlled ?
Capacity of absorption chillers is controlled by varying the
input thermal energy to generator.While input thermal energy to absorption
chillers is regulated with reference to load on chillers .Suppose load on
absorption chillers changes then the outlet temperature of chilled water will also be changed little and this is generally sensed by chiller instrumentation.Chiller
controller now regulates the valve of thermal energy with respect to the change
in thermal load.
Capacity Modulation of Absorption Chiller as load decreases
As load decreases chilled
water temperature decreases .When chilled water temperature decreases below predetermined
set point,gas valve (in case of direct fired chillers) will start closing accordingly
. As burner fire rate or steam flow rate is modulated chilled water temperature
will be changed accordingly.This decrease in load would cause closing of steam
inlet valve in case of steam operated absorption chiller (indirect fired
chillers).
This closing of valve will reduce the heat input to generator of
absorption chillers and temperature in generator will be reduced. By this
technique of capacity modulation,heat input to chiller is lowered in generator so accordingly less vapors of
refrigerant (water in lithium bromide chillers) will be produced .These vapor
get condensed in condenser of chiller and finally reach the evaporator of
chiller at lower pressure.Now because less vapors reach evaporator so less heat
will be extracted from chilled water and refrigeration effect will be reduced
and chilled water temperature will increase accordingly.
Mass flow rate of refrigerant is directly proportional to
load and refrigeration effect.
Generally between 30 and 100 percent of the hvac system design refrigeration load, the burner fired rate is modulated. Below 30 percent of design hvac load, the burner is cycled on and off, and all refrigerant and solution pumps remain.
On the other hand ,concentration of solution reaching the
absorber from generator will drop accordingly.In other words as less thermal
energy is supplied to generator of chillers, solution reaching the absorber
will be less strong as it would still contain some refrigerant. This little less strong solution
will have less capacity to absorb refrigerant vapors as compared to strong
solution.So accordingly more vapors will remain in evaporator and would
increase the evaporating temperature and pressure in evaporator of absorption chiller. Finally a new balance will be established between gas inlet valve and
load to achieve the preset temperature at outlet of evaporator.
Capacity Modulation of Absorption Chiller as load Increases
Similarly if load on hvac absorption chiller increases then chilled water temperature will also be increased accordingly.Chiller need to be adjusted in accordance with this new load value.Gas valve or steam inlet valve will be opened more to adjust the refrigeration effect and load on chiller.Rest of effect will be inverse of load decrease.
