scholarly journals Technical requirements analysis of integrated paralleled-loop exhaust air heat pump system applied to ultra-low energy building in different climatic regions of China

2021 ◽  
pp. 353-353
Author(s):  
Xiaoya Ji ◽  
Guoyuan Ma ◽  
Feng Zhou ◽  
Lei Wang ◽  
Guoqiang Wu ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Heat Pump ◽  
Cooling Capacity ◽  
Low Energy ◽  
Heating Season ◽  
Pump System ◽  
Heat Pump System ◽  
Technical Parameters ◽  
Climatic Regions ◽  
Technical Requirements

Based on the simulation results of the typical rural ultra-low energy building (ULEB) in 5 different climatic regions of China, three indicative technical parameters for paralleled-loop exhaust air heat pump (PEAHP) R&D- which are nominal heating/cooling capacity, maximum required fresh air to return air ratio (MFRR) and system energy efficiency grades- were calculated and summarized according to the demand of indoor thermal comforts by using statistic method. The nominal heating/cooling capacities were determined according to the peak loads, which are 6.84/2.01kW, 5/2.96 kW, 3.9/4.6 kW, 3.08/5.02 kW and 3.4/0.46 kW in the ULEB of Harbin, Beijing, Shanghai, Guangzhou and Kunming respectively. To ensure both thermal comforts and energy conservation, during the heating season, full fresh air supply is suggested in Beijing and the 1:0.5 MFRR is suggested in Harbin, Shanghai, Guangzhou and Kunming. During the cooling season, the 1:5 MFRR is suggested in Shanghai and Guangzhou, the 1:3, 1:1.5 and 1:0.5 MFRR are suggested in Harbin, Beijing and Kunming respectively. The PEAHP energy efficiency grades 1~5 are 7.92~11.7, 7.58~11.5, 7.5~11.35, 6.12~9.27 and 4.64~7.03 during the heating season of Harbin, Beijing, Shanghai, Guangzhou and Kunming respectively, and are 2.33~3.54, 3.93~5.96, 4.61~6.98, 4.62~6.99 and 2.04~3.1 for the cooling season respectively.

Performance analysis of photovoltaic-thermal road assisted ground source heat pump system during non-heating season

Solar Energy ◽  
2021 ◽  
Vol 221 ◽  
pp. 10-29
Author(s):  
Bo Xiang ◽  
Yasheng Ji ◽  
Yanping Yuan ◽  
Chao Zeng ◽  
Xiaoling Cao ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Heat Pump ◽  
Ground Source Heat Pump ◽  
Heating Season ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source

scholarly journals Field Test on Performance of an Air Source Heat Pump System Using Novel Gravity-Driven Radiators as Indoor Heating Terminal

2021 ◽  
Vol 9 ◽  
Author(s):  
Jie Jia ◽  
Xuan Zhou ◽  
Wei Feng ◽  
Yuanda Cheng ◽  
Qi Tian ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Heat Pump ◽  
Field Test ◽  
Thermal Response ◽  
Heat Output ◽  
Pump System ◽  
Heat Pump System ◽  
Air Source Heat Pump ◽  
Gravity Driven ◽  
Indoor Comfort

The simultaneous need for energy efficiency and indoor comfort may not be met by existing air source heat pump (ASHP) technology. The novelty of this study lies in the use of a new gravity-driven radiator as the indoor heating terminal of ASHPs, aiming to provide an acceptable indoor comfort with improved energy efficiency. To confirm and quantify the performance improvement due to the proposed system retrofit, a field test was conducted to examine the system performance under real conditions. In the tests, measurements were made on the refrigerant- and air-side of the system to characterize its operational characteristics. Results showed that the proposed radiator has a rapid thermal response, which ensures a fast heat output from the system. The proposed system can create a stable and uniform indoor environment with a measured air diffusion performance index of 80%. The energy efficiency of the proposed system was also assessed based on the test data. It was found that the system’s first law efficiency is 42.5% higher than the hydraulic-based ASHP system. In terms of the second law efficiency, the compressor contributes the most to the overall system exergy loss. The exergy efficiency of the proposed system increases with the outdoor temperature and varies between 35.02 and 38.93% in the test period. The research results and the analysis methodology reported in this study will be useful for promoting the technology in search of energy efficiency improvement in residential and commercial buildings.

A TRNSYS/GROCS Simulation of the TECH House I Ground-Coupled Series Solar-Assisted Heat Pump System

1983 ◽  
Vol 105 (4) ◽  
pp. 446-453 ◽  
Author(s):  
D. J. Roeder ◽  
R. L. Reid
Keyword(s):  
Heat Pump ◽  
Storage Tank ◽  
Heating System ◽  
Electric Resistance ◽  
Heating Season ◽  
Pump System ◽  
Heat Pump System ◽  
Seasonal Performance ◽  
The University ◽  
Better Than

The series solar-assisted heat pump heating system with ground-coupled storage in The University of Tennessee’s TECH House I in Knoxville, Tennessee, has been modeled using TRNSYS/GROCS and was compared to the experimental performance for the 1980–81 heating season. The simulation results were within 8 percent of the experimental measurements. Both simulation and experimental results showed that ground coupling of thermal storage led to the elimination of electric resistance backup heat and a large reduction in the peak heating demand of the house. Results of a parametric study showed that, in general, a ground-coupled storage tank performs better than a storage tank placed outdoors in the Knoxville area. Application of a next generation heat pump resulted in the most significant impact on the seasonal performance factor. As expected, higher performance collectors and larger collector areas led to higher system seasonal performance. An economic analysis showed that the series solar heat pump system cannot economically compete with the stand-alone heat pump system in the Knoxville area.

scholarly journals THE HEAT PUMP SYSTEM FOR VENTILATION AND AIR CONDITIONING INSIDE THE PRODUCTION AREA WITH AN EXCESSIVE INTERNAL MOISTURE GENERATION

2020 ◽  
Vol 17 (2) ◽  
pp. 78-86
Author(s):  
M.K. Bezrodny ◽  
Keyword(s):  
Energy Efficiency ◽  
Relative Humidity ◽  
Heat Pump ◽  
Air Conditioning ◽  
Warm Season ◽  
Pump System ◽  
Heat Pump System ◽  
Environment Temperature ◽  
Production Area ◽  
Continental Climate

The paper studies application feasibility and energy efficiency of the ventilation and air conditioning heat pump system for maintaining comfort conditions inside the production area with an excessive internal moisture generation during the warm season. In this regard, a thermodynamic analysis of a heat pump system with a partial exhaust air recirculation and a variable ratio of fresh outside air was carried out. Numerical analysis was then done to estimate the influence of changes in the environment temperature and relative humidity and the characteristics of the ventilation and air conditioning object on the system parameters. This allowed to determine potential capabilities of this system to maintain comfortable conditions in the production area. It was also shown that the required additional cooling of the supply air at the entrance to the premise for air conditioning demands can be determined by a simple coefficient and its calculation method is provided in the article. The heat pump system of temperature and humidity maintenance has the highest energy efficiency in the zone of relatively low environment temperatures and largely depends on the relative humidity of the outside air. This suggests that the studied system is suitable for application in countries with temperate continental climate.

scholarly journals Experimental Study on Automatic Switching of Solar Coupled Groundwater Source Heat Pump System

2021 ◽  
Vol 2095 (1) ◽  
pp. 012077
Author(s):  
Xiaoming Zhang ◽  
Qiang Wang ◽  
Qiujin Sun ◽  
Mingyu Shao
Keyword(s):  
Energy Efficiency ◽  
Heat Pump ◽  
Average Energy ◽  
Energy System ◽  
Hot Water ◽  
Efficiency Ratio ◽  
Pump System ◽  
Heat Pump System ◽  
Domestic Hot Water ◽  
Groundwater Source

Abstract There have been few practical applications of solar coupled groundwater source heat pump (GWHP) systems in large public buildings, and data on this technology are scarce. A solar coupled GWHP system was investigated in this study. The system uses an underground water source heat pump system for heating in winter, cooling in summer, and providing part of the domestic hot water, and it also uses a solar energy system to prepare domestic hot water. These two types of energy are complementary. The system was tested throughout the cooling season. This experiment ran from May 10, 2021, to September 10, 2021. The results show that the system can guarantee the indoor design temperature and the supply of domestic hot water. The solar water heating system operated for 1233 min in the summer; hot water (2334 m3) was prepared. During the summer, the average energy efficiency ratio of the GWHP unit was approximately 4.88. The energy efficiency ratio of the entire system was approximately 3.34. Such projects can play a key role in demonstrating this type of system.

A review of heat pump implementation specifics in residential sector energy efficiency

2020 ◽  
Vol 5 ◽  
pp. 24-27
Author(s):  
Anna Isanova ◽  
Galina Martynenko ◽  
Vladimir Lukyanenko ◽  
Elvira Semenova
Keyword(s):  
Energy Efficiency ◽  
Environmental Protection ◽  
Heat Pump ◽  
Review Paper ◽  
Broad Distribution ◽  
Pump System ◽  
Heat Pump System ◽  
Residential Sector ◽  
Evaporation Temperature ◽  
Computational Part

Heat pump systems become very promising equipment saving energy and improving overall energy efficiency and environmental protection in the residential sector. This review paper provides an update on current specifics of heat pump implementation in Russian residential sector. The paper also reviews major technical and supporting measures promoting broad distribution of the heat pump technology. In a computational part of this paper, heat pump refrigerant evaporation temperature and its influence on fuel consumption were analyzed for a heat pump system arrangement option with parallel evaporators.

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