Experimental study of a new multifunctional water source heat pump system

Liu, Xiong; Hui, Fangfang; Guo, Qi Chao; Zhang, Yongbo; Sun, Tingting

doi:10.1016/j.enbuild.2015.11.069

Cited by 14 publications

(6 citation statements)

References 19 publications

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“…Liu et al [21] proposed a heat pump system that effectively recovers waste heat from wastewater for residential building heating and cooling. Compared to their previous prototype unit [22], the space cooling capacity is increased 20.7% in the space cooling operational mode, and the space cooling capacity can be increased 21.51% in the hot water operational mode. In addition to attaining a high thermal efficiency, heat pump systems also exhibit an excellent energy saving performance.…”

Section: Introductionmentioning

confidence: 82%

Water Heating and Operational Mode Switching Effects on the Performance of a Multifunctional Heat Pump

Luo

Huang

et al. 2020

Energies

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In this study, a multifunctional air and water source heat pump system was developed with a parallel refrigerant piping arrangement, which possessed six operational functions: space cooling (SC), space heating (SH), water heating (WH), water cooling (WC) and two composite operational modes. The two composite operational modes were the SC/WH mode and the SH/WH mode. The performance of the multifuctional heat pump system under different ambient conditions was investigated based on the testing standards of CNS 14464 and CNS 15466. In this study, the effect of the direct water heating (DWH) and circulating water heating (CWH) methods on the performance was investigated. It was found that the water heating performance of the system by the DWH method is better than that of the system by the CWH method. The water heating capacity and COPw,h of the DWH method can be improvement by 2.6% to 22.1% and 2.9% to 50.8%, respectively. Moreover, this study developed a refrigerant pressure balance method to achieve an effective steady state of the refrigerant pressure after operational mode switching. By the refrigerant pressure balance method, the required time to attain the steady state could be greatly reduced—by 50%. However, the deviation of the refrigerant mass flow rate between the refrigerant pressure balance method and the refrigerant pump down method after operational mode switching ranged from 0.15% to 7.6%.

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Section: Introductionmentioning

confidence: 82%

Water Heating and Operational Mode Switching Effects on the Performance of a Multifunctional Heat Pump

Luo

Huang

et al. 2020

Energies

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“…During the peak load time, low-temperature water will be used to decrease the room temperature by sending that water to the evaporator. (12)(13)(14)(15) By heat recovery with a heat pump, heating water and cooling water can be produced and stored simultaneously. The system has two sets of wall-mounted evaporators.…”

Section: Experimental Rig and Control And Monitoring Systemmentioning

confidence: 99%

Heat Recovery System for Reducing Smart Building Carbon Footprint

Chiu¹,

Chiu²,

Yean-Der³

2020

Sensors and Materials

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Taiwan is located in the subtropical zone where the summers are hot and humid. The demand for comfort and quality of life in this zone is increasing. Air conditioning equipment in Taiwan has transformed from a luxury item into a basic necessity, resulting in a growing demand for small, consumer air conditioning units. Attractive, low-noise, small, and split-type air conditioning systems have become popular in the residential air conditioning equipment market. In this study, we used a heat recovery system to recover heat from air to increase the system hot and cold side efficiency and reduce the carbon footprint of smart buildings. The improved wall mounted evaporator combined with a central monitoring system is different from the typical AC unit evaporator that makes the system much more efficient.

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“…A ground water‐source heat pump system with air pre‐conditioning (GWHP‐FAP) was proposed from the perspective of cascade utilization of low‐level energy stored in the groundwater . A new multifunctional water source heat pump system was also presented . Pirjo Majuri studied ground source heat pumps and environmental policies .…”

Section: Introductionmentioning

confidence: 99%

“…7 A new multifunctional water source heat pump system was also presented. 8 Pirjo Majuri studied ground source heat pumps and environmental policies. 9 A lot of researches have been carried out on air source heat pumps.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of defrosting and heating performance of a solar‐assisted heat pump integrated phase change energy storage

Chen

Zhang

et al. 2019

Int J Energy Res

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Summary This thesis investigates a novel solar‐assisted heat pump integrated phase change energy storage system. The defrosting performance of this system was studied experimentally and the results were compared with two traditionally used methods: reverse cycle defrosting (RCD) method and hot gas bypass defrosting (HGBD) method. The results show that the phase change energy storage system has superior performance compared with traditional defrosting methods. The indoor temperature drop recorded was relatively small and the defrosting time was 75% of the RCD system and 53% of HGBD system. The phase change energy storage system increased the condensation temperature which consequently increased the temperature difference of heat transfer resulting in higher conductivity in the defrosting progress. Compared with the method of RCD and the method of HGBD, the recovery time of the system was shortened by 90 and 160 seconds, respectively. The system works with low‐temperature heat source and circulating water, which considerably reduces energy consumption, thereby improving the performance of the defrosting system. A further experimental study was also conducted on the heating performance and the results also indicated that the value of COP can reach up to 3.6 in daytime, and the indoor temperature can be stably maintained above 18°C throughout the day. Novelty Statement A new defrosting method for energy storage defrosting is proposed, and the defrosting performance is compared with two common defrosting methods. In addition, the performances of the heating system over the day were experimentally investigated. The experimental results show the system meets the heating needs of the building. Finally, the influence of the outdoor temperature on the exergy efficiency of the system was discussed. It shows that this system can improve the operational stability, the system economy and energy saving.

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Experimental study of a new multifunctional water source heat pump system

Cited by 14 publications

References 19 publications

Water Heating and Operational Mode Switching Effects on the Performance of a Multifunctional Heat Pump

Water Heating and Operational Mode Switching Effects on the Performance of a Multifunctional Heat Pump

Heat Recovery System for Reducing Smart Building Carbon Footprint

Experimental analysis of defrosting and heating performance of a solar‐assisted heat pump integrated phase change energy storage

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