INVESTIGATION OF LOAD VARIATIONS WITH SEASONAL CONDITIONS AFFECTED TO COEFFICIENT OF PERFORMANCE OF AIR TO WATER HEAT PUMP

Journal article

Authors/Editors

Strategic Research Themes

No matching items found.

Publication Details

Author list: Kaewpradap, A.;Ohnjaikla, N.;Sanitjai, S.

Publication year: 2016

Journal: Journal of Research and Applications in Mechanical Engineering (2229-2152)

Volume number: 4

Issue number: 2

Start page: 175

End page: 182

ISSN: 2229-2152

URL: http://www.jrame.com/Home/index.php/en/table-of-contents/volume-4-issue-2-2016.html

Abstract

Following EN255-3 standard, coefficient of performance for tapping process (COPt) was defined. As the variation of temperature among different seasons, the load variations as outlet hot water temperature (Two) and the variation of temperature as ambient temperature (Ta) and air humidity from air to water heat pump (11 kW) were studied to obtain COPt . The results showed increase of ambient temperature enhanced COPt because lower electrical energy input (Wet) was induced by higher ambient temperature. Moreover, higher COPt was affected by higher air humidity. The results were shown that decrease of outlet water temperature affected to higher electrical energy input and enhanced higher COPt . This study could be concluded that ambient temperature was higher with lower outlet water temperature affected to lower electrical energy input for tapping process due to lower load of compressor. The overshot electrical energy input for tapping process was observed at specified ambient temperature for each outlet water temperature and it was resulted to diminish COPt significantly.

Keywords

Air to water heat pump, European standard EN255-3, Coefficient of Performance, Load variations, Seasonal conditions.