Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 66, Issue -, Pages 133-144Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2015.07.004
Keywords
Air-source heat pump; Defrosting control; TEPS; Field test
Categories
Funding
- National Natural Science Foundation of China [51178015]
- National Twelfth Five-Year Science & Technology Support Plan [2011BAJ03B10]
- Training Plan of Top-notch Talent Youth [Q0004020201501]
- New-Star of Science and Technology - Beijing City [Z111106054511029]
- science and technology plan project of Beijing Municipal Education Commission [KM 201410005022]
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To improve the defrosting accuracy of air source heat pumps (ASHPs), this paper proposes a novel defrosting control method by applying tube encircled photoelectric sensors (TEPSs). A field test was conducted for two heating seasons in Beijing, China, to verify the feasibility and practicality of the novel TEPS method. The test results revealed that irrespective of the environmental conditions, the TEPS method can initiate defrosting in similar situations: most of the heat exchanger surface had been covered by frost; the compressor suction temperature decreased by similar to 9 degrees C; the compressor discharge temperature increased by similar to 16 degrees C; and the heating capacity decreased by similar to 30%. Furthermore, the TEPS method was verified to make more accurate and more reasonable defrosting decisions than the traditional T-T method under both frosting and non-frosting conditions. The results indicate that the TEPS method is a competitive defrosting control method that can be used for ASHPs. (C) 2015 Elsevier Ltd and IIR. All rights reserved.
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