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Experimental study on a monovalent inverter-driven water-to-water heat pump with a desuperheater for low energy houses

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Title: Experimental study on a monovalent inverter-driven water-to-water heat pump with a desuperheater for low energy houses
Authors: Blanco, David L. Browse this author
Nagano, Katsunori Browse this author →KAKEN DB
Morimoto, Masahiro Browse this author
Keywords: Ground source heat pump
Hot water
Coefficient of performance
Issue Date: 10-Jan-2013
Publisher: Elsevier
Journal Title: Applied Thermal Engineering
Volume: 50
Issue: 1
Start Page: 826
End Page: 836
Publisher DOI: 10.1016/j.applthermaleng.2012.07.008
Abstract: In this study, a novel monovalent inverter-driven water-to-water heat pump with a desuperheater was developed. In this unique system, domestic hot water is produced at a constant temperature controlled by a variable flow rate and stored in a tank. The heat demand is constantly matched by the system through the use of an inverter-driven compressor, which eliminates the need for a buffer tank. Three heating configurations of the system were examined with respect to variable climate conditions and two space heating target temperatures: space heating (mode 1), domestic hot water production (mode 2) and a combination of both (mode 3). Mappings of the performance variables per frequency were constructed for mode 3. For the other modes, the highest COP was identified for each examined climate condition. The difference between modes 1 and 3 was less than 5% for every variable. The space heating target temperature had a strong influence on both modes, showing an average difference of 29% in the COP between 35℃ and 45℃. Mode 2 exhibited a considerably reduced COP compared to the other modes, as well as the lowest refrigerant mass flow rate and highest compression ratio among the three modes. From the previous results and the examination of the compressor, the compression ratio presents itself as a key parameter that can help to increase the COP if maintained at low values. The results of this research could be applied to the design of a control methodology for monovalent heat pumps.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: David Leonardo Blanco

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