02-09-2017, 11:45 AM
The waste heat is recovered using an exhaust gas heat exchanger and is supplied by desorbing by a heat transfer fluid loop. The absorber and condenser are hydraulically coupled to an ambient heat exchanger for heat rejection. The evaporator provides cooled water for space conditioning. A thermodynamic model for a baseline cooling capacity of 2 kW is developed and a detailed parametric study of the optimized system is performed for both the cooling mode and the heating mode in a number of operating conditions. These parametric investigations show that degradation of system performance may be limited, and yield coefficients are improved by adjusting the temperature of the coupling fluid as the ambient temperature varies. With variable return temperature, the system is able to provide design cooling capacity of 2 kW for the entire range of ambient temperature investigated using heat that would normally be wasted by direct rejection to the environment.