Absorption Chiller Energy calculations Based on The Master Thesis of Ammar Mohammad Khalil Bahman Symbols used: Q Heat transfer [kW] h Enthalpy [kJ/kg] m Mass flow rate [kg/s] FR Collector heat removal factor shx-c Cold side of heat exchanger shx-h Hot side of heat exchanger evap Evaporator abs Absorber con Condenser COP Coefficient of performance
Calculations The rate of heat addition in the generator and the energy input of the cycle: Q(gen) = h2m2+h3m3−h1m1 ……………………………………………(1) The rate of heat rejection out of the condenser is given by the following equation: Q(con) = m2(h2−h4)……………………………………………………………(2)
The rate of heat absorption of the evaporator is given by the following equation: Q(evap) = m2(h5−h9)…………………………………………………….(3) The rate of heat rejection of the absorber is given by the following equation: Q(abs) = h5m2+h6m3−h7m1………………………………………….(4) An energy balance on the hot side of the heat exchanger is given by the following equation: Qshx−h= m3(h3−h10) …………………………………………………… (5) Similarly an energy balance on the cold side of the heat exchanger is given by the following equation: Qshx−c= m1(h1−h8)………………………………………………………...(6) The overall energy balance on the heat exchanger is satisfied If Qshx−h=Qshx−c which is valid in this case. Coefficient of performance (COP) according to Figure 2.1 is defined as follows: COP =
