Experimental analysis of the influence of the expansion valve opening on the performance of the small size CO2 solar assisted heat pump

Rabelo, Sabrina Nogueira; Paulino, Tiago F.; Duarte, Willian Moreira; Maia, Antônio Augusto Torres; Machado, Luiz

doi:10.1016/j.solener.2019.08.013

Cited by 31 publications

(6 citation statements)

References 34 publications

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“…Finally, a quasidynamic model of the DX-SAHP water heater was performed and showed that, through proper control of the speed of the compressor, it is possible to improve energy efficiency and stability of the DX-SAHP systems. On the contrary, for a smallsize CO 2 DX-SAHP, the results presented in the study by Rabelo et al, [38] which are also compared to previous literature works, show that, for this specific refrigerant, the effect of the opening of the expansion device on electricity consumption of the compressor (and therefore COP of the HP) is negligible. Accordingly, the authors suggest using a static expansion device as a capillary tube, thus reducing the costs of this equipment.…”

Section: Solar Source-space Heating/cooling Distribution Sink and Dir...supporting

confidence: 63%

Analysis of the Potential of Solar‐Assisted Heat Pumps: Technical, Market, and Social Acceptance Aspects

2022

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Solar‐assisted heat pumps have the potential to increase the share of renewables in the energy systems for several cases, or to increase the flexibility of smart grids and integrated thermal‐electric grids. The development of such systems requires a comprehensive approach in which technical, market, and social acceptance are all tackled at the same time. Such a holistic approach is the main objective of the present review article. To do so, an investigation is performed by categorizing the integration approaches reported in the literature, exploiting the solar source either as a low‐temperature evaporator source or as supporting the condenser during heating operation. Furthermore, hybrid integration schematics and dual‐source approaches are discussed. Market and social aspects complete the analysis, with the aim of finally identifying the current status; the main drivers and challenges are also addressed. The reported results confirm that the exploitation of solar thermal energy can increase the achievable performance of heat pumps in a broad range of climates. A favorable regulatory/financial framework and informative campaigns for businesspersons and the wide public have been identified as the main solutions to maximize the deployment of the technology in the coming years.

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Section: Solar Source-space Heating/cooling Distribution Sink and Dir...supporting

confidence: 63%

Analysis of the Potential of Solar‐Assisted Heat Pumps: Technical, Market, and Social Acceptance Aspects

2022

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“…Chopra et al, 2021 [52] discovered that coated glass wrapper, taking help of crystalline insulation in the middle of collector and wrapper may be used to reduce the heat loss. Rabela et al, 2019 [53] studied about the influence of wind speed in the best size of solar collector, If wind speed changes from 0 to 9m/s it shows the variation by 0.8% and it was also seen that compressor which shows the excessive COP has the shortest supplant. Vengadesan and Senthil, 2022 [54] studied about the Flat Plate Solar Collector(FPSC) and concluded that the performance depend on the solar energy absorbed by the collector.…”

Section: Flat Plate Collectormentioning

confidence: 99%

Review on Solar Assisted Heat Pump Water Heating System

Pant¹,

Meena²,

Choudhary³

2022

IJERA

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As with increasing demand of energy it is very necessary to switch into alternate resources of energy as consumption of fossil fuels is resulting in emissions of greenhouse gases which is very harmful for the environment and the energy resources also increasing the prices as the demands are increasing. Almost 30%-40% electricity was consumed in heating the water for domestic purposes hence it is very important and necessary to search for some alternate source for heating the water apart from burning the fossil fuel no other option then solar is best for heating the water. This paper discussed each component of Solar Assisted Heat Pump Water Heating System. In this article flat plate collector, glazing, tube arrangement, compressor with variable speed, condenser coil arrangement, types of refrigerant and a deep about heat pump and direct expansion solar assisted heat pump system is reviewed.

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“…The results showed that after a variation in the solar radiation, the expansion device needs to act almost immediately to maintain the superheat in the correct value range. In addition, Rabelo et al [23,24] presented two experimental studies with a CO 2 DX-SAHP. In the first one, the authors discussed the influence of water mass flow rate on the performance of the equipment.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Model of a Transcritical CO2 Heat Pump for Residential Water Heating

et al. 2021

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This paper presents a distributed mathematical model for a carbon dioxide direct expansion solar-assisted heat pump used to heat bath water. The main components are a gas cooler, a needle valve, an evaporator/collector, and a compressor. To develop the heat exchange models, mass, energy, and momentum balances were used. The model was validated for transient as well as steady state conditions using experimental data. A reasonably good agreement was observed between the predicted temperatures and experimental data. The simulations showed that the time step required to demonstrate the behavior of the heat pump in the transient regime is greater than the time step required for the steady state. The results obtained with the mathematical model revealed that a reduction in the water mass flow rate results in an increase in the water outlet temperature. In addition, when the carbon dioxide mass flow rate is reduced, the compressor inlet and outlet temperatures increase as well as the water outlet temperature.

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Experimental analysis of the influence of the expansion valve opening on the performance of the small size CO2 solar assisted heat pump

Cited by 31 publications

References 34 publications

Analysis of the Potential of Solar‐Assisted Heat Pumps: Technical, Market, and Social Acceptance Aspects

Analysis of the Potential of Solar‐Assisted Heat Pumps: Technical, Market, and Social Acceptance Aspects

Review on Solar Assisted Heat Pump Water Heating System

Dynamic Model of a Transcritical CO2 Heat Pump for Residential Water Heating

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