Steady state vapor compression refrigeration cycle simulation for a monovalent inverter-driven water-to-water heat pump with a desuperheater for low energy houses

摘要

A steady-state simulation is presented for a monovalent inverter-driven water-to-water heat pump with a desuperheater. For design-oriented simulations, superheating or sub-cooling degrees are used as input. However, the proposed simulation only uses the system's refrigerant charge, environmental, and control parameters, which make it particularly useful for off-design evaluations, including the annual performance factor calculation. Block models were used for the compressor and electronic expansion valve, while novel adaptive zone models were used for the heat exchangers. A multivariable error minimization algorithm was used over a sequential component scheme to provide global convergence. The numerical calculations were compared with 118 experimental results. The resulting COP agrees within 10% for 95.77% of the data. The mapping results reveal a maximum COP deviation of 8.78%. Computational results for the studied system reveal that a constant degree of superheating might not always maximize the COP.