Review of vapour compression heat pumps for high temperature heating using natural working fluids

Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael

doi:10.1016/j.ijrefrig.2017.04.021

Cited by 140 publications

(53 citation statements)

References 93 publications

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“…The experimental studies of this type of heat pumps for the production of process heat are limited. Although there are numerous experimental test-rigs for hot water heating mostly for buildings [84][85][86], its industrial application has not been examined so extensively [87]. This has mostly to do with the heat recovery process, requiring lower temperatures as the ones available in most waste heat recovery applications, as previously explained.…”

Section: Transcritical Co 2 Heat Pump Cyclesmentioning

confidence: 99%

Review of Experimental Research on Supercritical and Transcritical Thermodynamic Cycles Designed for Heat Recovery Application

et al. 2019

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Supercritical operation is considered a main technique to achieve higher cycle efficiency in various thermodynamic systems. The present paper is a review of experimental investigations on supercritical operation considering both heat-to-upgraded heat and heat-to-power systems. Experimental works are reported and subsequently analyzed. Main findings can be summarized as: steam Rankine cycles does not show much studies in the literature, transcritical organic Rankine cycles are intensely investigated and few plants are already online, carbon dioxide is considered as a promising fluid for closed Brayton and Rankine cycles but its unique properties call for a new thinking in designing cycle components. Transcritical heat pumps are extensively used in domestic and industrial applications, but supercritical heat pumps with a working fluid other than CO2 are scarce. To increase the adoption rate of supercritical thermodynamic systems further research is needed on the heat transfer behavior and the optimal design of compressors and expanders with special attention to the mechanical integrity.

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Section: Transcritical Co 2 Heat Pump Cyclesmentioning

confidence: 99%

Review of Experimental Research on Supercritical and Transcritical Thermodynamic Cycles Designed for Heat Recovery Application

et al. 2019

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“…In this study, the overall exergy destruction for the vapour compression system is obtained as the accumulation of the exergy destruction in each cycle component, as in Eq. (10).…”

Section: Exergy Analysismentioning

confidence: 99%

“…The working fluid selected for heat pumps determines the maximum performance obtained at certain heat sink temperatures. While at lower temperatures, traditional refrigerants such as HFC-134a, HFC-32, and HC-290 can be used in the industry [9], for high-temperature applications other fluids must be considered [10]. Moreover, for higher heat sink temperatures and temperature lifts, the COP can be improved using advanced configurations, different from the basic cycle [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental exergy and energy analysis of a novel high-temperature heat pump with scroll compressor for waste heat recovery

et al. 2019

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The industrial sector demands novel sustainable energy systems to advance in its decarbonisation and meet the targets of the Paris Agreement for the climate change mitigation. High-Temperature Heat Pumps (HTHPs) are being investigated as a feasible energy conversion technology alternative to traditional fossil fuel boilers. This paper presents the first experimental results of an HTHP prototype equipped with a modified scroll compressor and internal heat exchanger (IHX). The elements of the main and secondary circuits are presented, as well as the test methodology and heat balances are exposed. The tests have been performed using HFC-245fa at heat source temperatures between 60 and 80 °C, and heat sink temperatures between 90 and 140 °C. The heating capacity and coefficient of performance (COP) varied between 10.9 and 17.5 kW and between 2.23 and 3.41, respectively. An exergetic analysis indicated that the expansion valve was the component with the worst second law efficiency and the compressor presented the highest potential improvement over the other cycle components. A computational analysis of low global warming potential (GWP) refrigerant alternatives was carried out, which confirmed the benefits of using an internal heat exchanger (IHX) and the good performances of the low-GWP refrigerants: HCFO-1224yd(Z), HCFO-1233zd(E), and HFO-1336mzz(Z). Finally, we proved that the proposed system can save up to 57% of the equivalent CO2 emissions of a natural gas boiler. This paper provides a reference for the high-temperature heat pump recovery of the lowgrade waste heat from industrial energy processes.

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“…The International Energy Agency (IEA) [5] produced a report on industrial heat pumps, indicating the markets, level of technological maturity, applications and barriers of heat pumps. The report highlights that the theoretical potential for application of industrial heat pumps increases significantly for heat sink temperatures up to and higher than 100 • C. Nellisen and Wolf [6] investigated the heat demand across different industries in the European market and indicated that about 626 PJ (174 TWh) of heat is reachable by industrial heat pumps, of which about 113 PJ (19 %) is in the temperature range 100 • C to 150 • C. Recently, Arpagaus et al [3] presented a comprehensive review on high-temperature heat pump (HTHP) systems, concluding that industrial HTHPs can potentially supply the industrial European demand of 113 PJ.However, the literature highlights that the development of mass-produced units is hindered by many factors, such as low awareness of the heat consumption in companies and the possible technical solutions [3,5]; lack of knowledge of comprehensive heat pump integration methods [3,5,7]; lack of available refrigerants with low global warming potential in the high-temperature range [3,8]; lack of cost-efficient solutions and long payback periods [5,8,9]; and the technical challenges related to the compressor operation at high temperatures [10].…”

Section: Introductionmentioning

confidence: 99%

Design of centrifugal compressors for heat pump systems

2018

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Review of vapour compression heat pumps for high temperature heating using natural working fluids

Cited by 140 publications

References 93 publications

Review of Experimental Research on Supercritical and Transcritical Thermodynamic Cycles Designed for Heat Recovery Application

Review of Experimental Research on Supercritical and Transcritical Thermodynamic Cycles Designed for Heat Recovery Application

Experimental exergy and energy analysis of a novel high-temperature heat pump with scroll compressor for waste heat recovery

Design of centrifugal compressors for heat pump systems

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