Partial load performance test of residential heat pump system with low-GWP refrigerants

In, Sungjin; Cho, Keumnam; Lim, Byunghan; Lee, Changseon

doi:10.1016/j.applthermaleng.2015.04.013

Cited by 39 publications

(11 citation statements)

References 12 publications

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“…mono-compressor, multi-compressor, inverter-driven), with respect to traditional heating and cooling systems, is still incomplete. Some authors focused their research on the optimization of mono-compressor [8][9]13] or inverter-driven [7,10,12] heat pumps, but a complete comparison between the seasonal performance obtainable by adopting these heat pumps as a function of the design thermal loads of the building is still missing. In this paper, the estimation of the seasonal performance, both in heating and cooling mode, of different models of electric-driven air-to-water heat pumps, located in different European climates, is shown.…”

Section: Introductionmentioning

confidence: 99%

“…It has been demonstrated that air-source heat pumps can contribute to reduce the primary energy consumption of a building with respect to traditional systems [5]; however, the potential energy saving linked to the use of air-source heat pumps depends on the correct selection of the heat pump size, on the basis of the building seasonal energy needs and on outdoor conditions [6]. In the last years, many researchers have investigated which parameters mainly influence the seasonal energy performance of air-source heat pumps [7][8][9][10] and specific numerical models have been proposed in order to estimate the Seasonal Energy Efficiency Ratio (SEER) and the Seasonal Coefficient Of Performance (SCOP) of these devices coupled to a building. As an example, Kinab et al [11] presented a numerical model of a modulating reversible air-source heat pump, by means of which the optimal design of the system can be obtained.…”

Section: Introductionmentioning

confidence: 99%

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Sizing effects on the energy performance of reversible air-source heat pumps for office buildings

Dongellini

Naldi

Morini

2017

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sizing effects on the energy performance of reversible air-source heat pumps for office buildings

Dongellini

Naldi

Morini

2017

Applied Thermal Engineering

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“…In et al [67] compared R32, R446A, and R410A in a residential HP, as shown in Figure 8. The test conditions for the heating and cooling modes were selected according to the EN14825 standard, matching the system capacity.…”

Section: R32 Pure and Mixtures As Alternatives To R410amentioning

confidence: 99%

“…Figure 8. Experimental results in a residential HP [67]: capacity, COPc, mass flux, and discharge temperature for R410A, R32, and R446A under the standard a) heating mode and b) cooling mode.…”

Section: R32 Pure and Mixtures As Alternatives To R410amentioning

confidence: 99%

Refrigerant R32 as lower GWP working fluid in residential air conditioning systems in Europe and the USA

Mota-Babiloni

Navarro-Esbrí

Makhnatch

et al. 2017

Renewable and Sustainable Energy Reviews

100

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Because air conditioning and heat pump systems contribute greatly to greenhouse gas emissions, equipment with both lower global warming potential (GWP) working fluids and a higher level of performance should be used. R32 (difluoromethane) has been proposed to substitute R410A, particularly in residential air conditioning (RAC) systems. This study collected the most relevant and recent researches into R32 as a refrigerant so as to assess its viability in RAC systems in both Europe and the USA, as compared to R410A and other lower GWP RAC alternatives.The R32 value of GWP is 677, which is below the F-gas regulation limit in RAC equipment (750). According to ASHRAE standard 34, R32 is less flammable than hydrocarbons, and the amount of charge permitted for R32 is above the necessary level in RAC equipment. It can be concluded that R32 has significantly good heat transfer characteristics and a level of performance that make it acceptable at low condensing temperatures, thereby avoiding overly high compressor discharge temperatures. Its performance is very similar to that of R410A across the entire operating range, and it is therefore believed that R32 will be utilized in RAC systems in the remaining countries that prioritize lower GWP fluids but are less strict in their security regulations.To replace R410A under extreme conditions, some system modifications can be conducted, or R32 mixtures with hydrofluoroolefins (HFOs) can be used. Such mixtures achieve a lower performance than R32, but are acceptable replacements when considering their lower GWP compared to that of R32, and similar level of flammability. Finally, other (R32-based) alternative mixtures have also been developed and their behaviours studied under a wide range of operating conditions.

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“…Han et al [26] showed that a new ternary non-azeotropic mixture of HFC-161/125/143a's thermodynamic properties are similar to those of R404A, but its global warming potential (GWP) is much lower than those of R507A and R404A. Ln et al [27] found that the SEER and SCOP of R32 and mixing refrigerant R446A were higher than R410A by 8% and 1% in a residential heat pump system. A comparison of R404A with six low-GWP mixing refrigerants including mid-term alternatives R407A and R407F and long-term alternatives L40, DR-7, N40 and DR-33 was conducted by Mota-Babiloni et al [28] in terms of cooling capacity, volumetric flow rate and COP, and conclusions were given that the most efficient alternatives were the low-flammable refrigerants L40 and DR-7 considering two-stage and diverse operating conditions.…”

Section: Introductionmentioning

confidence: 99%

A New Mixture Refrigerant for Space Heating Air Source Heat Pump: Theoretical Modelling and Performance Analysis

2018

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Featured Application: This paper proposed a new mixture refrigerant named RHR-1with high energy efficiency, no ODP (ozone depletion potential) and low GWP (global warming potential), which suitable for ASHP (air source heat pump) heating in residential buildings of rural areas in North China.Abstract: Air source heat pump (ASHP) is becoming a substitute for small coal boilers in rural residential buildings of North China. However, the application of ASHP faces challenges of heating capacity, energy efficiency, ozone depletion potential (ODP) and global warming potential (GWP). Proper refrigerant is a key factor influences the performance of ASHP. In this paper, a new mixture refrigerant named RHR-1 is proposed, which aimed to improve energy efficiency, eliminate ODP and reduce GWP of ASHP refrigerant. The performance of RHR-1 was analyzed and compared with commonly used refrigerants including R134a, R410A, R407C and R22 in terms of heating coefficient of performance (COP h ), compression ratio (CR) and discharging temperature (DT). The results show that, under the design cases, where supply water temperatures vary from 35 • C to 50 • C and outdoor air temperatures vary from −15 • C to 15 • C, the COP h of RHR-1 are in the range of 2.43-4.93. The COP h of RHR-1 is higher than other candidates when the supply water temperature is above 40 • C. The CR and DT of RHR-1 are in medium levels of the compared samples. A logarithmic regression equation was deduced to get the relationship of COP h with temperature difference between supply water and outdoor air which suggested the temperature difference should be controlled within 47.5 • C to get reasonable COP h . In addition, RHR-1 has no ODP, and its GWP is 279, which is much lower than other candidates. RHR-1 could be a reasonable refrigerant used in ASHP for space heating in North China.

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Partial load performance test of residential heat pump system with low-GWP refrigerants

Cited by 39 publications

References 12 publications

Sizing effects on the energy performance of reversible air-source heat pumps for office buildings

Sizing effects on the energy performance of reversible air-source heat pumps for office buildings

Refrigerant R32 as lower GWP working fluid in residential air conditioning systems in Europe and the USA

A New Mixture Refrigerant for Space Heating Air Source Heat Pump: Theoretical Modelling and Performance Analysis

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