Date of Award
Mechanical, Automotive, and Materials Engineering
McDonald, T. W.,
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In order to investigate the use of air-to-water vapour compression reversed heat engines for heating domestic hot water supplies, a user friendly computer program was developed to simulate such systems operating under steady state conditions. An experimental study was also carried out so that simulation results could be compared to actual data. The comparison revealed that the program accurately predicts trends in system performance. The program simulates systems that consist of a compact heat exchanger evaporator, a reciprocating compressor, a throttle valve, and a condenser that may be either a coil immersed in a water tank or a concentric tube heat exchanger. The user may optionally specify a regenerator and must specify either R-12 or R-22 as the refrigerant. The user must also specify (1) the inlet air temperature, relative humidity and face velocity and the water temperature (and mass flow rate for concentric tube heat exchangers), (2) the compressor outlet to inlet pressure ratio, (3) performance data for the compressor, (4) physical dimensions and thermal conductance of the evaporator, (5) physical dimensions of the condenser, (6) whether the system has a receiver at the condenser outlet or an accumulator at the evaporator outlet, (7) whether or not to consider frictional pressure drop and secondary heat transfer in the interconnecting piping (in order to speed up simulation during preliminary studies). The program determined the condenser capacity, evaporator capacity, power input to the compressor, and coefficient of performance all within 10 percent of experimental data. The predictions of the compressor inlet and outlet pressures differed by less than 5 percent from the experimental data (usually less than 2 percent). The program successfully predicted system performance trends when the compressor crank shaft speed, throttle valve setting, condenser cooling water temperature, and cooling water mass flow rate were independently varied. (Abstract shortened by UMI.)Dept. of Mechanical, Automotive, and Materials Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1993 .E547. Source: Masters Abstracts International, Volume: 32-02, page: 0695. Adviser: T. W. McDonald. Thesis (M.A.Sc.)--University of Windsor (Canada), 1993.
Emersberger, Joseph R., "Computer simulation of air to water reversed heat engines." (1993). Electronic Theses and Dissertations. 1520.