Novel compound waste heat-solar driven ejector-compression heat pump for simultaneous cooling and heating using environmentally friendly refrigerants

Al-Sayyab, Ali Khalid Shaker; Mota-Babiloni, Adrián; Navarro-Esbrí, Joaquin

doi:10.1016/j.enconman.2020.113703

Cited by 27 publications

(3 citation statements)

References 48 publications

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“…For different applications, Gatarìc and Lorbek [10] tested R450A in household heat pump tumble dryers and Molinaroli et al [11] in a water-to-water heat pump, with similar outcomes related to the energy consumption and efficiency (not much different from R134a) and heating capacity (slightly reduced because of the lower condensation pressure with respect to R134a). Several numerical approaches including Artificial Intelligence have also been followed to investigate the possible use of R450A in refrigeration systems (Belman-Flores et al, 2017 and Zendehboudi et al, 2019) [12] [13] and in waste heat-solar driven ejector heat pumps for simultaneous heating and cooling (Al-Sayyab et al, 2021) [14], all with encouraging and positive outcomes.…”

Section: Introductionmentioning

confidence: 99%

Experimental data for flow boiling of R450A in a horizontal tube

Mastrullo,

Mauro,

Passarelli

et al. 2024

J. Phys.: Conf. Ser.

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According to the new European policies aimed at the replacement of highly-pollutant greenhouse gases refrigerants, the scientific community has focused on new synthetic environmentally friendly substances to be employed in vapor compression cycles for the refrigeration and the air conditioning fields. On this regard, R450A is a new blend made up of R134a (42%) and R1234ze (58%), having a GWP equal to 604, and therefore represents an attractive solution as pure R134a substitute. In this paper, new flow boiling heat transfer and pressure drop data of R450A collected at the refrigeration lab of Federico II University of Naples are presented. The data refer to a horizontal stainless-steel tube having an internal diameter of 6.0 mm. The effects of mass flux (from 150 to 400 kg m−2s−1), heat flux (from 10 to 20 kW m−2) and saturation temperature (from 30 to 50 °C) are presented and discussed, together with the assessment of the most quoted two-phase heat transfer and pressure drop prediction methods.

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Section: Introductionmentioning

confidence: 99%

Experimental data for flow boiling of R450A in a horizontal tube

Mastrullo,

Mauro,

Passarelli

et al. 2024

J. Phys.: Conf. Ser.

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“…The proposed system has a 24% higher COP than a conventional system. Al-Sayyab et al (Khalid Shaker Al-Sayyab et al 2021) compared a compound ejector-heat pump system with an R134a conventional heat pump for simultaneous heating and cooling. The study concluded that R450A increases COP by 7% and 75% in cooling in heating modes.…”

Section: Introductionmentioning

confidence: 99%

Techno-economic analysis of a PV/T waste heat–driven compound ejector-heat pump for simultaneous data centre cooling and district heating using low global warming potential refrigerants

Al-Sayyab

Navarro-Esbrí

Barragán-Cervera

et al. 2022

Mitig Adapt Strateg Glob Change

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A comprehensive techno-economic evaluation is evaluated based on an innovative compound ejector-heat pump system with PV/T (photovoltaic thermal) waste heat-driven. The aim of the system is simultaneous data centre cooling and waste heat recovery for district heating to reduce residential greenhouse gas emissions. The new system avoids the ejector pump by combining PV/T waste heat with an evaporative-condenser as an ejector driving force, considering several low global warming potential alternatives to R134a. The simulation indicates that the proposed system presents a remarkable difference in all investigated refrigerants’ overall system coefficient of performance (COP). Particularly, R515B presents the highest increase in COP, 54% and 49% in cooling and heating modes, respectively. It also provides the highest electricity consumption reduction, 84.1 MWh yearly. Moreover, the system improves the data centre power usage effectiveness (PUE) index from 10 to 19%. In financial terms, the shortest payback period (6.3 years) is obtained with R515B, followed by R515A and R1234ze(E).

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“…Meanwhile, the generated electric power is used to operate the heat pump compressor [8]. Recently, heat pumps have been combined to waste heat-driven ejectors, presenting a system performance enhancement [9].…”

Section: Introductionmentioning

confidence: 99%

Conventional and Advanced Exergoeconomic Analysis of a Compound Ejector-Heat Pump for Simultaneous Cooling and Heating

et al. 2021

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This work focused on a compound PV/T waste heat driven ejector-heat pump system for simultaneous data centre cooling and waste heat recovery for district heating. The system uses PV/T waste heat as the generator’s heat source, acting with the vapour generated in an evaporative condenser as the ejector drive force. Conventional and advanced exergy and advanced exergoeconomic analyses are used to determine the cause and avoidable degree of the components’ exergy destruction rate and cost rates. Regarding the conventional exergy analysis for the whole system, the compressor represents the largest exergy destruction source of 26%. On the other hand, the generator shows the lowest sources (2%). The advanced exergy analysis indicates that 59.4% of the whole system thermodynamical inefficiencies can be avoided by further design optimisation. The compressor has the highest contribution to the destruction in the avoidable exergy destruction rate (21%), followed by the ejector (18%) and condenser (8%). Moreover, the advanced exergoeconomic results prove that 51% of the system costs are unavoidable. In system components cost comparison, the highest cost comes from the condenser, 30%. In the same context, the ejector has the lowest exergoeconomic factor, and it should be getting more attention to reduce the irreversibility by design improving. On the contrary, the evaporator has the highest exergoeconomic factor (94%).

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Novel compound waste heat-solar driven ejector-compression heat pump for simultaneous cooling and heating using environmentally friendly refrigerants

Cited by 27 publications

References 48 publications

Experimental data for flow boiling of R450A in a horizontal tube

Experimental data for flow boiling of R450A in a horizontal tube

Techno-economic analysis of a PV/T waste heat–driven compound ejector-heat pump for simultaneous data centre cooling and district heating using low global warming potential refrigerants

Conventional and Advanced Exergoeconomic Analysis of a Compound Ejector-Heat Pump for Simultaneous Cooling and Heating

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