Space Conditioning Performance Analysis and Simulation Study

摘要

Simulation models were developed and used for the analysis of the space conditioning systems discussed. The authors expanded the engine-driven heat pump model developed previously to incorporate a new approach for evaluating the influence of cycling and infiltration on the latent load and latent cooling effectiveness. Analysis of these systems included the sensitivity of performance to electric consumption, compressor speed, sizing and climate. A modular program for evaluating the steady state performance of absorption heat pumps was developed. Initial simulations indicated performance trends as a function of outdoor temperature and the refrigerant-absorber charge. The combustion heating system model, HFLAME, was used to simulate the benefits of fan/pump overrun and the dependence of corresponding setpoints on off-period losses and electric costs. Benefits of fuel, fuel/air modulation as compared to cyclic performance were also analyzed, incorporating recent experimental data and previously derived dependence of the temperature rise on excess air and fuel input. HFLAME was also used to analyze the seasonal efficiency of different direct venting methods, which were found to range from 61% (conventional) to 75% (balanced flue with inversion).