Dynamic model and experimental validation for a gas cooler of a CO 2 heat pump for heating residential water.

Autor:	de Oliveira, Raphael Nunes, Faria, Ralney Nogueira, Antonanzas-Torres, Fernando, Machado, Luiz, Koury, Ricardo Nicolau Nassar
Předmět:	PERFORMANCE of heat pumps HEAT pump efficiency GAS air conditioning ENERGY conservation MATHEMATICAL models HEAT exchangers THERMAL properties of water
Zdroj:	Science & Technology for the Built Environment; Jan-Sep2016, Vol. 22 Issue 1, p30-40, 11p, 5 Diagrams, 2 Charts, 7 Graphs
Abstrakt:	This work presents a dynamic model for a CO2heat pump gas cooler. The gas cooler model is based on the conservation equations of energy, mass, and momentum. Due to the importance of an expansion device and a compressor for heat exchanger modeling, detailed mathematical treatment is also given to those devices. The spatial variations of temperature, pressure, specific volume, and mass flow rate are predicted at each time step. The model is validated by comparing simulation results and experimental data for transient and steady conditions. It observes a reasonably good agreement between these results, with a maximum deviation of 2°C (3.6°F) between the mathematical model and experimental data, with the test data exhibiting a fairly similar trend. The developed model is therefore presented as a useful tool for analyzing the dynamic behavior for the gas cooler of a heat pump operating with CO2. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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