Sustainable Building Operation Using Simulation - Low Energy Cooling for Sustainable Buildings - page 204

Figure 6.2 Power and thermal COP of a 15 kWcooling machine as a function of generator temperature
of different absorption chillers, it is therefore essential to compare the same three
temperature levels of evaporator, absorber/condenser and generator.
To model the DACM an expanded characteristic equation is set up for the NH 3 /H 2 O
working pair. Additional components such as the dephlegmator, the gas heat exchanger
(GHX) and the bubble pump with the variable mass flow rates, are included in the
model. Equations for ammonia/helium are used to calculate the enthalpies in the
auxiliary gas circuit.
Figure 6.3 Simulated cooling power as a function of cooling water temperature for a market-available
15 kW absorption chiller