Experimental study on performance of double-mode refrigeration system. (April 2021)
- Record Type:
- Journal Article
- Title:
- Experimental study on performance of double-mode refrigeration system. (April 2021)
- Main Title:
- Experimental study on performance of double-mode refrigeration system
- Authors:
- Yang, Yongan
Zhu, Yiqun
Zhang, Zhe
Li, Ruishen
Sun, Zhili
Huang, Chengjun - Abstract:
- Highlights: A novel double-mode refrigeration system with a single refrigerant is proposed. Variable-frequency characteristics of system are investigated experimentally. Intersection points of two modes under different working conditions are obtained. Control strategy of two modes are obtained. Abstract: To ensure energy-saving and environment-friendly operation of multifunctional cold storage refrigeration systems, an experimental platform for a double-mode refrigeration system (DMRS) has been built, which can realize both a single-compression refrigeration cycle (SRC) and a cascade refrigeration cycle with a single refrigerant (CRC). The variable-frequency characteristics and control strategy of two modes were experimentally studied. The results show that with an increase in the low-temperature stage compressor frequency, there exist an optimal COP and optimal compressor frequency, the optimum frequency increases with a decrease in evaporation temperature and condensation temperature. When the condensation temperatures are 45, 40, and 35 °C, the evaporation temperature switching values of the refrigeration capacity are 2.5, −1.2, and −4.1 °C, respectively, and the evaporation temperature switching values of the COP are −10.6, −15.0, and −19.1 °C, respectively; and a control strategy of mode switching and compressor frequency adjustment is summed. When the system is running between two modes, the compression ratio is below 6, the discharge temperature is below 100 °C, andHighlights: A novel double-mode refrigeration system with a single refrigerant is proposed. Variable-frequency characteristics of system are investigated experimentally. Intersection points of two modes under different working conditions are obtained. Control strategy of two modes are obtained. Abstract: To ensure energy-saving and environment-friendly operation of multifunctional cold storage refrigeration systems, an experimental platform for a double-mode refrigeration system (DMRS) has been built, which can realize both a single-compression refrigeration cycle (SRC) and a cascade refrigeration cycle with a single refrigerant (CRC). The variable-frequency characteristics and control strategy of two modes were experimentally studied. The results show that with an increase in the low-temperature stage compressor frequency, there exist an optimal COP and optimal compressor frequency, the optimum frequency increases with a decrease in evaporation temperature and condensation temperature. When the condensation temperatures are 45, 40, and 35 °C, the evaporation temperature switching values of the refrigeration capacity are 2.5, −1.2, and −4.1 °C, respectively, and the evaporation temperature switching values of the COP are −10.6, −15.0, and −19.1 °C, respectively; and a control strategy of mode switching and compressor frequency adjustment is summed. When the system is running between two modes, the compression ratio is below 6, the discharge temperature is below 100 °C, and as the evaporation temperature increases from −35 °C to 10 °C, the COP of the system at 45 °C, 40 °C and 35 °C varies from 0.98 to 3.54, 1.20 to 4.27 and 1.42 to 5.20 respectively. … (more)
- Is Part Of:
- Applied thermal engineering. Volume 188(2021)
- Journal:
- Applied thermal engineering
- Issue:
- Volume 188(2021)
- Issue Display:
- Volume 188, Issue 2021 (2021)
- Year:
- 2021
- Volume:
- 188
- Issue:
- 2021
- Issue Sort Value:
- 2021-0188-2021-0000
- Page Start:
- Page End:
- Publication Date:
- 2021-04
- Subjects:
- Single-stage compression refrigeration -- Cascade refrigeration -- Mode switch -- Compressor frequency -- COP -- Refrigeration capacity
Heat engineering -- Periodicals
Heating -- Equipment and supplies -- Periodicals
Periodicals
621.40205 - Journal URLs:
- http://www.sciencedirect.com/science/journal/13594311 ↗
http://www.elsevier.com/homepage/elecserv.htt ↗
http://www.elsevier.com/journals ↗ - DOI:
- 10.1016/j.applthermaleng.2021.116670 ↗
- Languages:
- English
- ISSNs:
- 1359-4311
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 1580.101000
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