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Thermodynamic assessment of high temperature heat pumps for heat recovery.

Number: pap. 2233

Author(s) : KONDOU C., KOYAMA S.

Summary

Reducing energy consumption by utilizing heat recovery systems has become increasingly important in industry. For this problem, heat pumps are one solution to recover waste heat. This paper presents an exploratory assessment of heat pump-type heat recovery systems using environmentally friendly refrigerants. The coefficient of performance (COP) of four different cycle configurations used to raise the temperature of heat media up to 160°C with a waste heat of 80°C are calculated and compared for the refrigerants R717, R365mfc, R1234ze(E), and R1234ze(Z). A multiple-stage “extraction” cycle drastically reduces the throttling loss in the expansion valve and the exergy loss in the condensers and consequently achieves the highest COP among the calculated cases with R1234ze(Z). A cascade cycle using R1234ze(Z) and R365mfc has a relatively high COP and also provides many practical benefits. Even with 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 thermodynamic assessment demonstrated that the use of high-temperature heat pumps to recover waste heat is promising to reduce primary energy consumption for industrial applications.

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Pages: 10 p.

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Details

  • Original title: Thermodynamic assessment of high temperature heat pumps for heat recovery.
  • Record ID : 30013200
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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