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The main objective of this work is to study the dynamic behaviour of a vapour compression heat pump for residential water heating. The designed, modelled 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 R-134a. 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.
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Pages: ICR07-E2-1437
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Details
- Original title: Numerical model and experimental study of a low-cost heat pump for residential water heating.
- Record ID : 2008-0900
- Languages: English
- Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
- Publication date: 2007/08/21
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Indexing
- Themes: Residential heat-pumps
- Keywords: Household application; Transient state; Air-water; Simulation; Heat pump; Performance; Domestic water
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Determination of a domestic hot water annual pe...
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Influence of the compressor design on the perfo...
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- Date : 2007/08/21
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- Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
- Formats : PDF
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