Performance evaluation of a direct expansion solar-assisted heat pump by numerical simulation of the throttling process in the expansion device

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Isaac Simbaña
https://orcid.org/0000-0002-3324-3071
William Quitiaquez
https://orcid.org/0000-0001-9430-2082
José Estupiñán
https://orcid.org/0000-0003-2286-5737
Fernando Toapanta-Ramos
Leonidas Ramírez
https://orcid.org/0000-0003-2569-2974

Abstract

The performance evaluation of a direct expansion solar-assisted heat pump (DX-SAHP) was analyzed using numerical simulation about the throttling process in the expansion device. The experimental system operation parameters were validated by normality test with 95 % confidence. An E2V09SSF expansion valve was modeled for numerical analysis in the ANSYS software Fluent module. The best meshing of the valve generated 263524 elements and 50449 nodes with an excellent skewness metric of 0.2334. Refrigerant temperature and pressure were defined as boundary conditions at valve inlet, besides its velocity. Continuity, momentum and energy equations were used, considering a k-epsilon RNG model. The pressure values of the refrigerant at the expansion device outlet, obtained by simulation, were compared to experimental values that were determined in the DX-SAHP prototype system. The refrigerant pressure, obtained by simulation for a heating time of 0 to 40 minutes, was 161.61, 186.50 and 238.33 kPa. The absolute error between the experimental and simulated pressure was 4.07 kPa, while the relative error was less than 2 %.

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How to Cite
Simbaña, I., Quitiaquez, W., Estupiñán, J., Toapanta-Ramos, F., & Ramírez, L. (2022). Performance evaluation of a direct expansion solar-assisted heat pump by numerical simulation of the throttling process in the expansion device . Revista Técnica "energía", 19(1), PP. 110–119. https://doi.org/10.37116/revistaenergia.v19.n1.2022.524
Section
EFICIENCIA ENERGÉTICA

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