Investigation of the effect of using various HFC refrigerants in geothermal heat pump with residential heating applications

Deymi–Dashtebayaz, Mahdi; Maddah, Saeed; Goodarzi, Marjan; Maddah, Omid

doi:10.1007/s10973-020-09539-5

Cited by 40 publications

(10 citation statements)

References 48 publications

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“…The experimental prototype consisted of a refrigerant loop, an antifreeze loop, a data acquisition unit and a control unit. As seen Figure 9b, in the prototype, R134a flowing in the refrigerant loop is pumped into the water-cooled plate fin condenser (2) from the tested ARHEx (7). The subcooled refrigerant becomes the two-phase fluid after flowing through the dryer (1) and enters the EEV (3).…”

Section: Evaporator Validationmentioning

confidence: 99%

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Control Strategy for Helicopter Thermal Management System Based on Liquid Cooling and Vapor Compression Refrigeration

Zhao

Pang

et al. 2020

Energies

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With the continuous application of high-power electronic equipment in aircraft, highly efficient heat transfer technology has been emphasized for airborne applications. In this paper, a thermal management system based on an antifreeze liquid cooling loop and a vapor compression refrigeration loop is presented for high-power airborne equipment in a helicopter. The simulation models of the thermal management system are built in order to study its control strategy for the changing flight conditions. The antifreeze-refrigerant evaporator and air-refrigerant condenser are specially validated with the experimental data. A dual feedforward proportion integration differentiation and expert control algorithm are adopted in the inlet temperature of the cold plate and sub-cooling control of the refrigerant by regulating the compressor speed and the fan speed, respectively. A preheating strategy for antifreeze is set up to decrease its flow resistance in cold day conditions. The control strategy for the thermal management system is finally built based on the above control methods. In this paper, two extreme conditions are discussed, including cold and hot days. Both the simulation results show that the superheated, sub-cooling and antifreeze inlet temperature of the cold plate can be controlled at 3 to8 °C, −10 to −3 °C and 18 to22 °C, respectively. Under the same changing flight envelope, the coefficient of performance of the vapor compression refrigeration loop is relatively stable on the cold day, which is about 6, while it has a range of 2.58–4.9 on the hot day.

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Section: Evaporator Validationmentioning

confidence: 99%

“…Deymi-Dashtebayaz et al [7] investigated the impact of various refrigerants on the efficiency of the geothermal heat pump operation. The critical parameters such as coefficient of performance (COP), exergy efficiency and exergy destruction for various components were calculated and investigated.…”

Section: Introductionmentioning

confidence: 99%

Control Strategy for Helicopter Thermal Management System Based on Liquid Cooling and Vapor Compression Refrigeration

Zhao

Pang

et al. 2020

Energies

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“…The study reported that using an economizer has a more significant impact on the GSHP cycle. The research in [4] investigated the impact of various refrigerants on the efficiency of the geothermal heat pump operation and concludes that R134A and R125 refrigerants have the highest and lowest COP and exergy efficiency, respectively. The authors in [5] investigated the two-phase flow boiling heat transfer characteristics of a refrigerant.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Power Quality Problems in Large-Scale Application of Air-Source Heat Pump

Zheng¹,

Che²,

Bi³

et al. 2022

Energy Engineering

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With the implementation of electric energy alternatives, the large-scale application of electric energy substitution represented by air-source heat pumps has replaced traditional coal-fired heating, which is beneficial for the environment and alleviates air pollution. However, the large-scale application of airsource heat pumps has brought power quality problems such as voltage sags, harmonic pollution, and three-phase imbalance to the distribution network. This paper studies the fixed-frequency and variablefrequency air-source heat pump, introduces its working principle, analyzes the mechanism of its power quality problem. Moreover, the paper establishes a simulation model for the fixed-frequency heat pump and variable-frequency heat pump to connect to the distribution network. This research mainly studies the impact of large-scale fixed-frequency heat pumps on the depth of voltage sags in the distribution network and the impact of large-scale variable-frequency heat pumps on the harmonic content of the distribution network under different penetration rates and uses measured data to verify the reliability of the simulation results. This paper uses experimental data for the first time to verify the real power quality problems of large-scale heat pumps, which can provide a reference for determining the power quality standards for heat pumps connected to the power grid. At the same time, it can also provide a reference for the power quality management of the distribution network that is actually connected to electric heating.

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“…In addition, the energetic and exergy performance of a new configuration of liquid chemical looping gasification (LCLG) [8] and syngas production with supercritical biomass gasification [9] and investigations of toluene methylation to para-xylene [10]. There has been a significant shift in harnessing the heat and fluids conversion for various HVAC applications [11][12][13][14][15]. Last few years have been a significant shift in the maintenance of thermal comfort and adequate ventilation in buildings [12,13,16], a period during which certain economic energy-cost issues and public awareness to the extension of comfort are being emphasized, allowing it to become a real challenge, both economically and socially.…”

Section: Introductionmentioning

confidence: 99%

“…There has been a significant shift in harnessing the heat and fluids conversion for various HVAC applications [11][12][13][14][15]. Last few years have been a significant shift in the maintenance of thermal comfort and adequate ventilation in buildings [12,13,16], a period during which certain economic energy-cost issues and public awareness to the extension of comfort are being emphasized, allowing it to become a real challenge, both economically and socially. The development of thermal comfort techniques has played a paramount role to enlighten comfort parameters with various renewable energy technologies [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Thermophysics Analysis of Office Buildings with a Temperature–Humidity Coupling Strategy Under Hot-Arid Climatic Conditions

Bensafi

Ameur²,

Kaid

et al. 2021

Int J Thermophys

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This study investigates the determining parameters of thermal comfort of office in an arid hot-arid environment of Bechar, located in the northwestern region of Algeria, in which the vertical walls of the room and the roof are subjected to solar irradiations and the floor is considered to be adiabatic. The solar flux is calculated by the ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) method. The predicted results are validated against the experimental results of the meteorological station of the ENERGARID research laboratory at the University of Bechar (Algeria). The characteristics of the ambient air flow are performed by using the computational fluid dynamics (CFD) software (Fluent). The flow fields, thermal fields, and humidity are investigated. An elaborated computer program (with Delphi language) is utilized to evaluate the temperature–humidity coupling as the most essential factors of the thermal comfort. A significant impact of dynamic temperatures and humidity on thermal comfort has been observed, especially in this hot-arid environment. Besides, a considerable effect of the flow velocity has been remarked. From the obtained results and to provide the best thermal comfort in such arid regions, the range of air velocity inside the building is recommended to be between 0.2 m·s−1 and 0.3 m·s−1.

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Investigation of the effect of using various HFC refrigerants in geothermal heat pump with residential heating applications

Cited by 40 publications

References 48 publications

Control Strategy for Helicopter Thermal Management System Based on Liquid Cooling and Vapor Compression Refrigeration

Control Strategy for Helicopter Thermal Management System Based on Liquid Cooling and Vapor Compression Refrigeration

Analysis of Power Quality Problems in Large-Scale Application of Air-Source Heat Pump

Thermophysics Analysis of Office Buildings with a Temperature–Humidity Coupling Strategy Under Hot-Arid Climatic Conditions

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