Distributed mathematical model and experimental validation for a CO2 heat pump assisted by solar energy
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Universidade Federal de Minas Gerais
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A use of CO2 operating in a transcritical cycle has been proven for heat pumps is a demonstrably viable
and considerably interesting option due to the environmental advantages of CO2 over other refrigerant gases. In order
to improve the energy performance of systems that use heat pumps, integrating a type of energy such as renewable
geothermal, solar, wind and bio-fuels must be available. In this scenario, a mathematical model with experimental
validation of the components that allows the modeling of the heat pump system to vary the input parameters and determine
the outlet water temperature and the coefficient of performance (COP) of the heat pump. This article approaches the
modeling of the DX-SAHP, in order to obtain the profile of temperature and pressure distribution along the gas cooler,
and the values of heat exchange and pressure in collector solar/evaporator. The model was validated with experimental
data from 88 tests performed under different operating conditions, even the DX-SAHP in question. In the experimental
the radiation incidence range in the study environment was from 0 to 845 W/m² and at an ambient temperature of 21°C to
33°C. The maximum difference between the theoretical results and experimental results was 9.5%.
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DX-SAHP, Mathematical mode, Evaporator
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