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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
MATHEMATICAL MODELING OF CAPILLARY TUBES OF A DIRECT- EXPANSION HEAT PUMP CHARGED WITH PROPANE
Submission Author:
Hélio Augusto Goulart Diniz , MG , Brazil
Co-Authors:
Hélio Augusto Goulart Diniz, THIAGO TORRES MARTINS ROCHA, Sara Isabel de Melo Resende, Luiz Machado, Raphael Nunes Nunes de Oliveira
Presenter: Hélio Augusto Goulart Diniz
doi://10.26678/ABCM.ENCIT2020.CIT20-0285
Abstract
The application of heat pumps for water heating has been a fertile field for research and development for several decades. In recent years, the Direct-Expansion Solar Assisted Heat Pump (DX-SAHP) has been extensively explored through mathematical models and experimental tests. A low-cost DX-SAHP for residential water heating was developed to operate with propane refrigerant (R290). The equipment operates in three enviromental situations and a different capillary tube is required for each one. The objective of the present work is to present the mathematical modeling of the capillary tubes and to verify if the mass of refrigerant present in these devices is significant when compared with the mass of the heat exchangers of the system. The capillaries designed have an internal diameter of 0.042 inch and lengths of 2.45, 1.68 and 1.22 m, suitable for operating in low, medium and high thermal input conditions, respectively.
Keywords
mathematical modeling, DX-SAHP, capillary tube, propane (R290)
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