Distributed mathematical model and experimental validation for a CO2 heat pump assisted by solar energy

• Autor(a) principal: Humberto de Oliveira Reis
• Data de Publicação: 2022
• Outros Autores: Tiago de Freitas Paulino, Luiz Machado, Willian Moreira Duarte
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UFMG
• Texto Completo: http://hdl.handle.net/1843/58542
• topic: DX-SAHP; Mathematical mode; Evaporator; Evaporadores

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%.