Numerical simulation on solar collector and cascade heat pump combi water heating systems in Kazakhstan climates

Yerdesh, Yelnar; Abdulina, Z.; Aliuly, Abdurashid; Belyayev, Ye.; Mohanraj, M.; Kаltayev, А.

doi:10.1016/j.renene.2019.06.102

Cited by 45 publications

(16 citation statements)

References 31 publications

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“…Yerdesh et al. 27 reported that R744 and R290 combination (R744 in the low-temperature circuit and R290 in the high-temperature circuit) is a good environmentally friendly option for a two-stage cascade heat pump owing to its negligible GWP.…”

Section: Introductionmentioning

confidence: 99%

“…Paulino et al 26 reported that using an electronic expansion valve has improved the performance of a DXSTHPS by varying the refrigerant mass flow rate through the flat plate collectorevaporator according to the sunshine availability. Yerdesh et al 27 reported that R744 and R290 combination (R744 in the low-temperature circuit and R290 in the high-temperature circuit) is a good environmentally friendly option for a two-stage cascade heat pump owing to its negligible GWP.…”

Section: Introductionmentioning

confidence: 99%

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Experimental studies on direct expansion solar thermal heat pump systems using R430A as a substitute to R134a

Mohanraj

Kartheheyan

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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The use of halogen-based refrigerants in heat pump applications is restricted because of their high global warming potential (GWP). Therefore, it is necessary to identify a low GWP substitute for heat pump applications. This article presents the energy performance of a direct expansion solar thermal heat pump system (DXSTHPS) using R430A as an environmentally friendly substitute to phase out R134a. The effects of ambient parameters on compressor discharge temperature, compressor energy consumption, condenser heating capacity and coefficient of performance (COP) of a DXSTHPS using R134a and R430A are estimated and compared. Moreover, the total equivalent global warming impacts (TEGWI) of a DXSTHPS using R134a and R430A are evaluated. The results showed that the R430A has 0.7–1.9% lower compressor energy consumption than R134a. The condenser heating capacity and COP of a DXSTHPS using R430A are higher than R134a by 4.6–8.7% and 5.1–10.2%, respectively. The compressor discharge temperature observed in a DXSTHPS using R430A is 5.8 °C higher than R134a. The lubricant physical properties are retained at higher compressor operating temperatures, ensuring compressor reliability. The DXSTHPS using R430A has 4.2–12.9% lower TEGWI due to its lower GWP with lower compressor energy consumption than R134a.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental studies on direct expansion solar thermal heat pump systems using R430A as a substitute to R134a

Mohanraj

Kartheheyan

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…Kong et al [6] experimentally tested a direct expansion SAHP unit during autumn and winter period and reported COP was higher than 4 in autumn and higher than 2.5 in winter. Recently, Yardesh et al [7] presented that two stage cascade SAHP unit can provide sufficient heating even for very cold climate regions. A SAHP unit is adapted for the proposed DHW system in this paper.…”

Section: Introductionmentioning

confidence: 99%

A simulation study on performance improvement of solar assisted heat pump hot water system by novel controllable crystallization of supercooled PCMs

et al. 2020

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Domestic hot water (DHW) has a significant share in building's energy consumption. In order to reduce this consumption, various solutions have been proposed such as controlling the system in an efficient way, using renewable sources and using phase change materials (PCM) in the system to increase heat capacity. However, this study is not only offering heat capacity improvement of the DHW storage unit but also proposing that energy efficiency can be improved by controlling the heat releasing time of the PCM. In this study, supercooled PCM tubes are placed in a water tank and charged with a solar assisted heat pump unit, these supercooled PCM tubes can then be discharged anytime when the hot water is required. In this paper, a transient thermodynamic model is built for the whole system including solar collector, heat pump, water tank with PCM and DHW demand profile. System components are modelled and a 24 hours of demand profile is used in simulation for a UK home for summer and spring weather conditions. The results show that the PCM tubes effectively compensate the morning peak hot water demand and reduce daily energy consumption around 12.1% and 13.5% by shifting heating provision from immersion heater to solar heat pump.

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“…Currently, buildings take up for about 35% of all energy consumed in China. This proportion increases year by year with the development of society [1][2][3][4]. Around 75% of building energy consumption are utilized for winter heating and summer cooling.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Features and Design of Solar-Air Source Composite Heating System

Ni¹

2020

IJHT

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Facing the huge energy consumption of buildings, it is highly practical to study every aspect of energy-saving technologies for heating and cooling devices. Solar thermal technology and air/water source heat pump are two popular energy-saving technologies, which could be combined into a composite heating system with good energy-saving effect and efficiency. This paper constructs a solar-air source composite heating system, analyzes its thermodynamic features, and builds up the corresponding thermodynamic model. In addition, the authors modeled the daytime and nighttime heat balances, as well as the monthly cumulative heat supply for the constructed system. Finally, a dual-tank composite heating system was designed with independent heat supply/storage. The proposed models and system were proved valid and scientific through experiments.

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Numerical simulation on solar collector and cascade heat pump combi water heating systems in Kazakhstan climates

Cited by 45 publications

References 31 publications

Experimental studies on direct expansion solar thermal heat pump systems using R430A as a substitute to R134a

Experimental studies on direct expansion solar thermal heat pump systems using R430A as a substitute to R134a

A simulation study on performance improvement of solar assisted heat pump hot water system by novel controllable crystallization of supercooled PCMs

Thermodynamic Features and Design of Solar-Air Source Composite Heating System

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