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Refrigerants selection for a direct expansion solar assisted heat pump for domestic hot water
Federal University of Minas Gerais (UFMG).
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
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2019 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 184, no May, p. 527-538Article in journal (Refereed) Published
Abstract [en]

An important step during a project of a heat pump system is choosing a more suitable refrigerant. This paper presents a comparative study among refrigerants for a small direct expansion solar assisted heat pump (DX-SAHP). The mathematical model used in this study is presented in detail and validated from an experimental setup. The R134a is the reference and the refrigerants with low GWP are R290, R600a, R744 and R1234yf. The results show that R290 has better COP than others refrigerants for solar radiation between 300 W/m2 and 700 W/m2, as well as for environment temperature between 10 C and 35 C. On the other hand, for solar radiation less than 50 W/m2, the R134a has better COP than R290. TEWI (Total Equivalent Warming Impact) analysis indicates that the indirect emission is the most important effect, and then, the TEWI results almost followed the COP outcome. A parametric analysis was conducted to evaluate the influence of the CO2 emission factor for producing electricity. In countries with higher emission factor, the refrigerant with the best COP has the best TEWI. The influence of wind speed and ambient temperature in COP of a DX-SAHP using R290 were more relevant in low solar radiation

Place, publisher, year, edition, pages
2019. Vol. 184, no May, p. 527-538
Keywords [en]
Alternative refrigerants, R1234yf, R290, R600a, R744, DX-SAHP
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-249947DOI: 10.1016/j.solener.2019.04.027ISI: 000466823400047Scopus ID: 2-s2.0-85064212207OAI: oai:DiVA.org:kth-249947DiVA, id: diva2:1306387
Note

QC 20190430

Available from: 2019-04-23 Created: 2019-04-23 Last updated: 2019-06-11Bibliographically approved

Open Access in DiVA

The full text will be freely available from 2021-04-01 15:14
Available from 2021-04-01 15:14

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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