The experimental investigation on a novel transcritical CO2 heat pump combined system for space heating

Cao, Feng; Cui, Ce; Wei, Xiangyu; Yin, Xiang; Li, Mingjia; Wang, Xiaolin

doi:10.1016/j.ijrefrig.2019.05.004

Cited by 25 publications

(6 citation statements)

References 22 publications

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“…To validate the mathematical model and coupling model presented above, a prototype of the dual transcritical CO 2 system with a dedicated transcritical CO 2 subcooler is carefully built, and plentiful measurements are carried out in the enthalpy difference laboratory. The detailed parameters of the prototype can be found in our previous publication [33], and the intermediate temperature can be achieved by regulating the auxiliary compressor speed. After comparing the simulation results with our previous tests, the veracity of the simulation models can be verified, which gives us the convenience to carry on the discussion that is shown below based only on the simulation results.…”

Section: The Verification Of the Simulation Modelmentioning

confidence: 99%

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Investigation of the Impact Factors on the Optimal Intermediate Temperature in a Dual Transcritical CO2 System with a Dedicated Transcritical CO2 Subcooler

2020

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As a natural fluid with superior environment advantages, CO2 is used to constitute a dual transcritical system to reduce performance deterioration under high gas-cooler outlet temperature. Aiming at the system configuration, improvement potential, and optimization, the proposed system is deeply analyzed, and corresponding coupling models are presented in detail. First, the veracity of simulation models is completely verified by comparing with previous measurements. Then, the existence of the optimal intermediate temperature is validated, while the optimal values are found to increase with the augmentation in ambient and water-feed temperatures. Moreover, the negative effects of the pinch point on the heat transfer inside the gas cooler could be greatly reduced by using the dual gas cooler. Finally, a predictive correlation for optimal intermediate temperature determination with ambient and water-feed temperature as independent variables is proposed, which provides a theoretical basis for the proposed system to realize efficient control in the industrialization process.

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Section: The Verification Of the Simulation Modelmentioning

confidence: 99%

“…In terms of adjustment methods of the intermediate temperature, the compressor speed ratio is manually adjusted to obtain a changeable compressor displacement ratio then changeable subcooling capacity in our previous works [33], by which the stepless regulation of the intermediate temperature can be achieved.…”

Section: Regulation Of the Intermediate Temperaturementioning

confidence: 99%

Investigation of the Impact Factors on the Optimal Intermediate Temperature in a Dual Transcritical CO2 System with a Dedicated Transcritical CO2 Subcooler

2020

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“…Yang et al [8] found that the COP of the new system is 22% higher than the conventional CO2 system. Cao et al [9] proposed a new ASHP prototype, and an experimental research was conducted. This study discusses the COP of the ASHP system, the impact of primary energy consumption and the annual carbon emissions.…”

Section: Introductionmentioning

confidence: 99%

Energy Conservation and Carbon Reduction of Air Source Heat Pump for District Heating

Zhao

Gao²,

Zhu³

et al. 2023

J. Phys.: Conf. Ser.

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Using ASHP for space heating is an environmental solution. Based on the concept of Lorenz cycle, an ASHP is proposed. Taking a residential community as an example, this study proposes a thermodynamic model. Then, the energy consumption and carbon emission performance of the heating system are discussed. The results indicate that the primary energy consumption of ASHP is 13.45% less than the coal-fired boiler and the carbon emission reduces by 1203.6 tCO2. This study is meaningful for the development of air source CO2 heat pump for space heating integrated with DMS.

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“…CO2 heat pumps have been studied extensively [4][5][6][7][8][9][10][11][12][13]. Carbon dioxide is a substance that is part of the natural biosphere and an environmentally friendly, safe, and economical refrigerant that can be used for cooling and heating systems.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of the Coupling of Two Co2 Heat Pump Cycles

Dima

Dobrovicescu

Ioniţă

et al. 2023

RRST-EE

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The study is looking for the optimal configuration of an air-to-water heat pump capable of heating water in a flow-return system. Carbon dioxide is used as a working agent. In the optimization strategy, exergy analysis is considered. Using exergy analysis, the magnitude and the location of any functional or constructive malfunction can be revealed. First, a standard one-stage heat pump system is considered. Due to the high exergy destruction in the throttling valve, the efficiency of the standard system is improved by coupling it with an auxiliary one. The coupling process is undertaken in an internal subcooler-evaporator-heat exchanger. By subcooling the CO2 before entering the throttling valve of the standard cycle, the exergy destruction associated with this process diminishes. To increase the efficiency of the globally coupled system, the heat transferred outside in the gas cooler of the auxiliary heat pump is used in the water heating process. The energetic and exergetic efficiencies of the coupled system increased by 19 % and 18.3 %, respectively, compared to the standard heat pump cycle.

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The experimental investigation on a novel transcritical CO2 heat pump combined system for space heating

Cited by 25 publications

References 22 publications

Investigation of the Impact Factors on the Optimal Intermediate Temperature in a Dual Transcritical CO2 System with a Dedicated Transcritical CO2 Subcooler

Investigation of the Impact Factors on the Optimal Intermediate Temperature in a Dual Transcritical CO2 System with a Dedicated Transcritical CO2 Subcooler

Energy Conservation and Carbon Reduction of Air Source Heat Pump for District Heating

Exergy Analysis of the Coupling of Two Co2 Heat Pump Cycles

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