1) The performance of a system under operating conditions has been studied by varying the generator and condenser temperatures. The results of generator and condenser temperature variation on COP of the system are presented in form of several graphs as shown.
2) The results indicate that the COP of single effect ammonia/water system varies from 0.3528 to 0.3113, under different operating conditions being simulated. However this variation is marginal.
3) It may be noted that the COP decreases with the increase in generator temperature for given condenser temperature for the system. The COP of the system is very sensitive to change in condenser temperature and decreases rapidly with increase in condenser temperature. The COP of the system decreases with increase in generator temperature because evaporator load is constant (i.e. 3.5 kW as required for the cabin cooling of truck) and as the generator temperature increases, it increases the heat load of generator. The net effect is seen as decrease in value of COP.
4) From the graph plotted between COP & heat load on generator for ammonia/water system, it can be seen that, under the various operating conditions being simulated, the maximum input to the generator as required in case of ammonia/water system is 11.24 kW. From calculations it is known that the available energy rejected by cooling system of truck engine is 34 kW. Thus the heat load on generator can be met very easily by using the engine exhaust for both the systems and is more than sufficient.
From above, it can be concluded that, for providing cabin cooling for truck using engine exhaust, vapour absorption systems can be used i.e. ammonia/water vapour absorption cycle.