NUMERICAL MODEL AND EXPERIMENTAL STUDY OF A LOW COST HEAT PUMP FOR RESIDENTIAL WATER HEATING
The main objective of this work is to study the dynamic behavior of a vapor compression heat pump for residential water heating. The designed, modeled and built heat pump is constituted basically by a small alternative compressor, a capillary tube, an air evaporator, and a condenser immersed in a 200 liter reservoir of water. Mathematical models for the evaporator and the condenser were developed from mass, momentum, and energy conservation laws, while the mathematical model for the capillary tube was based mainly on momentum conservation. These models use the relationships from bibliography to estimate the coefficients of heat transfer, pressure drop, and void fraction. The compressor model was developed based on experimental data from manufacturer and also from the energy conservation law. The coupling among the four component models allowed the determination of the spatial and temporal profiles of temperatures, pressures and mass flows, as well as the refrigerant distribution in the heat exchangers during the water heating process. The model of the system will be validated with the experimental results from a heat pump test bench operating with R134a. Measurements of temperatures, pressures, mass flows, electric current and voltage allowed the temporal evaluation of the temperatures and heat pump performance during the water heating process. Additional simulations were accomplished in order to analyze the system operation under various operating conditions.
Heat Pump Numerical Model Dynamic Operation
R.KOURY G.MAIA L.CASTRO L.MACHADO
Federal University of Minas Gerais, DEMEC – Campus UFMG, Av. Ant?nio Carlos, 6627 Pampulha, Belo Horizonte, MG, 31270-910, Brazil
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）