Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 53, Issue -, Pages 126-141Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2014.09.018
Keywords
Low-GWP; R1234ze(E); R1234ze(Z); High-temperature heat pump; Heat recovery
Categories
Funding
- project on the Development of High Efficiency and Non-Freon Air Conditioning Systems of the New Energy and Industrial Technology Development Organization (NEDO) in Japan
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Reducing energy consumption by utilizing heat recovery systems has become increasingly important in industry. This paper presents an exploratory assessment of heat pump type heat recovery systems using environmentally friendly refrigerants. The coefficient of performance (COP) of 4 cycle configurations used to raise the temperature of heat media to 160 degrees C with a waste heat at 80 degrees C is calculated and compared for refrigerants R717, R365mfc, R1234ze(E), and R1234ze(Z). A multiple-stage extraction cycle drastically reduces the throttling loss and exergy loss in the condensers, resulting in the highest COP for R1234ze(Z). A cascade cycle using R1234ze(Z) and R365mfc has a relatively high COP and provides practical benefits. Even under adverse conditions, the primary energy efficiency is greater than 1.3 when the transmission end efficiency of the electric power generation is 0.37. The assessment demonstrated that high-temperature heat pumps are a promising approach for reducing primary energy consumption for industrial applications. (C) 2014 Elsevier Ltd and IIR. All rights reserved.
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