Development of distributed multiple‐source and multiple‐use heat pump system using renewable energy: Outline of test building and experimental evaluation of cooling and heating performance

We herein report the development of a distributed heat pump system that can utilize a variety of renewable energy sources to meet different building heating and cooling demands (i.e., a multiple source and multiple use heat pump system, MMHP). In this system, a water circulating loop is used to connect ground heat exchangers, a unique sky-source heat pump, and various heat pumps for heating and cooling purposes to form a thermal network within a building. This distribution increases the flexibility of the system and allows an improved matching of supply and demand. To evaluate the system performance, an experimental house was constructed, and a winter field experiment was conducted. We found that the reported heat pump for floor heating achieved a stable operation with a high coefficient of performance of ~11.5, while the heat collecting operation performance of the sky-source heat pump varied significantly depending on the amount of solar radiation and the outside air temperature. Finally, since the sky-source heat pump contributes to an improvement in the whole system performance, it appears that there is still room for improved regarding the whole system performance by adjusting the operating and control strategy.

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Effects of intermediate pressure on the heating performance of a heat pump system using R410A vapor-injection technique

International Journal of Refrigeration ◽

10.1016/j.ijrefrig.2011.07.011 ◽

2011 ◽

Vol 34 (8) ◽

pp. 1911-1921 ◽

Cited By ~ 24

Author(s):

Chul Woo Roh ◽

Min Soo Kim

Keyword(s):

Heat Pump ◽

Injection Technique ◽

Pump System ◽

Heat Pump System ◽

Intermediate Pressure ◽

Heating Performance ◽

Vapor Injection

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Experimental Investigation on Heating Performance of Newly Designed Air Source Heat Pump System for Electric Vehicles

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4047821 ◽

2020 ◽

Vol 13 (2) ◽

Author(s):

Kang Li ◽

Jun Yu ◽

Rong Yu ◽

Lin Su ◽

Yidong Fang ◽

...

Keyword(s):

Heat Pump ◽

Electric Vehicles ◽

Flow Characteristics ◽

Cold Climate ◽

Positive Temperature ◽

Pump System ◽

Cooling Performance ◽

Heat Pump System ◽

Heating Performance ◽

Driving Range

Abstract Utilizing the heat from air source with heat pump system in electric vehicles shows a significant advantage from thermoelectric heat source for heat supply in cold climate. It could improve the driving range of electric vehicles considerably in winter and replace the positive temperature coefficient (PTC) heater with an acceptable cost and reliability. In this work, a newly designed heat pump system was first introduced with less components and cost. Second, experiments were conducted to investigate its cooling performance, and subsequent heating performance from −10 to 10 °C. The typical heat transfer and flow characteristics of refrigerant were recorded, and the behavior of each component including compressor, evaporator, condenser, and outside heat exchanger were analyzed and interpreted. The results showed that the heating and cooling performance of the new heat pump system could almost remain the same with traditional air-conditioning system in automobile and surely satisfy with the heat requirement of electric vehicles. In the heating mode, the maximum heating capacity increases by 13% at 400 m3/h air volume from 300 m3/h at the ambient temperature −10 °C, while the outlet air temperature decreases by 4–6%. In addition, using a heat pump system showed an increase in the driving range of electric vehicles by 25–31% as compared to PTC heaters.

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Development of Optimal Design Method for Ground-Source Heat-Pump System Using Particle Swarm Optimization

Energies ◽

10.3390/en13184850 ◽

2020 ◽

Vol 13 (18) ◽

pp. 4850

Author(s):

Hyeongjin Moon ◽

Jae-Young Jeon ◽

Yujin Nam

Keyword(s):

Renewable Energy ◽

Heat Pump ◽

Optimization Design ◽

Renewable Energy Sources ◽

Energy System ◽

Geothermal Heat ◽

Pump System ◽

Heat Pump System ◽

Geothermal Heat Pump ◽

Building Load

The building sector is an energy-consuming sector, and the development of zero-energy buildings (ZEBs) is necessary to address this. A ZEB’s active components include a system that utilizes renewable energy. There is a heat-pump system using geothermal energy. The system is available regardless of weather conditions and time, and it has attracted attention as a high-performance energy system due to its stability and efficiency. However, initial investment costs are higher than other renewable energy sources. To solve this problem, design optimization for the capacity of geothermal heat-pump systems should be performed. In this study, a capacity optimization design of a geothermal heat-pump system was carried out according to building load pattern, and emphasis was placed on cost aspects. Building load patterns were modeled into hospitals, schools, and apartments, and, as a result of optimization, the total cost over 20 years in all building load patterns was reduced.

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