Performance Characteristics of a Mobile Heat Pump System at Low Ambient Temperature

2018 ◽  
Author(s):  
Lili Feng ◽  
Predrag Hrnjak
Keyword(s):  
Ambient Temperature ◽  
Heat Pump ◽  
Performance Characteristics ◽  
Pump System ◽  
Heat Pump System ◽  
Low Ambient Temperature

scholarly journals Experimental study on R1234yf heat pump at low ambient temperature and comparison with other refrigerants

2019 ◽  
Vol 23 (6 Part B) ◽  
pp. 3877-3886
Author(s):  
Shuxue Xu ◽  
Jianhui Niu ◽  
Guoyuan Ma
Keyword(s):  
Ambient Temperature ◽  
Heat Pump ◽  
Power Input ◽  
Coefficient Of Performance ◽  
Injection System ◽  
Pump System ◽  
Heat Pump System ◽  
Performance Improvements ◽  
Vapor Injection ◽  
Low Ambient Temperature

In this paper, an integrated vapor injection compression heat pump system using R1234yf, R32, R410A, R22, and R134a as working fluids was developed, and their heating performances under low ambient temperature were quantitatively evaluated. An experimental bench was built to test the system?s working performance. The condensing temperature, evaporating temperature, power input, and other variables were analyzed to evaluate the system?s heating capability and energy efficiency. Test results showed that the R1234yf system can run at the evaporating temperature of ?20 ?C, but its heating coefficient of performance was 5% lower than R134a. The R1234yf vapor injection system provided very significant performance improvements for heating performance compared with no vapor injection: the heating capacity and heating coefficient of performance can be improved by 14.3% and 11.7%, respectively.

Performance characteristics of an ammonia-water absorption heat pump system

2013 ◽  
Vol 37 (14) ◽  
pp. 1917-1927 ◽  
Author(s):  
Mohamed A. Gadalla ◽  
Talaat A. Ibrahim ◽  
Mohamed A. M. Hassan
Keyword(s):  
Water Absorption ◽  
Heat Pump ◽  
Performance Characteristics ◽  
Pump System ◽  
Ammonia Water ◽  
Absorption Heat Pump ◽  
Heat Pump System

scholarly journals Hybrid Solar Geothermal Heat Pump System Model Demonstration Study

2022 ◽  
Vol 9 ◽  
Author(s):  
Yu-Jin Kim ◽  
Libing Yang ◽  
Evgueniy Entchev ◽  
Soolyeon Cho ◽  
Eun-Chul Kang ◽  
...  
Keyword(s):  
Power Consumption ◽  
Ambient Temperature ◽  
Heat Pump ◽  
Geothermal Heat ◽  
Pump System ◽  
Heat Pump System ◽  
Source Temperature ◽  
Heating And Cooling ◽  
Geothermal Heat Pump ◽  
Polygeneration System

In this paper, the development and demonstration of a hybrid solar geothermal heat pump polygeneration system is presented. The poly-generation system has been designed, modeled, and simulated in TRNSYS software environment. Its performance was assessed followed by installation and demonstration at a demo site in Cheongju, Korea. The space heating and cooling load of the building is 13.8 kW in heating mode at an ambient temperature of −10.3°C and 10.6 kW in cooling mode at an ambient temperature of 32.3°C. The simulation data were compared with the field demo data using ISO 13256. The results showed that the model data compare well with the demo data both in heating and cooling modes of operation. At a source temperature of 16.7°C, the heat pump lab performance data-based COPc shows 9.9, while demonstration COPc shows 10.3, thus, representing 4.3% relative error. The heat pump source temperature decreased by 4.0°C from 20.9°C to 16.9°C due to ground heat exchanger coupling and resulted in a COPc increase by 13.3% from 8.5 to 9.8. When compared at the design conditions (outside temperature of 32.3°C), the TRSNYS model overestimated the demonstration site data by 12%, 9.3 vs. 8.1 kW with power consumption of 3.1 vs. 2.2 kW. The hybrid polygeneration system power consumption decreased by 1.2 kW when ambient temperature decreased from 35°C to 25°C.

scholarly journals Experimental Study on the Cycle Performance Characteristics of the CO2 Heat Pump System under the Cooling Condition

2017 ◽  
Author(s):  
Hee Jeong Kang ◽  
Zhen Huan Wang ◽  
Jun Son ◽  
Sun-Joon Byun ◽  
Young-Chul Kwon
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Internal Heat ◽  
Optimal Operation ◽  
Performance Characteristics ◽  
Cycle Performance ◽  
Pump System ◽  
Heat Pump System ◽  
Operation Conditions ◽  
Internal Heat Exchanger

Developing high performance HVAC system using natural refrigerants including carbon dioxide (CO2) has been important in respect of environmental preservation and associated technologies. Thus studies to optimize the HVAC (heating ventilation air conditioner) system using natural refrigerants through clarifying the cycle performance characteristics are necessary. The CO2 heat pump system using air and water sources was consisted to examine its performance characteristics, and by varying conditions of several factors that affect or characterize the system performance like the amount of refrigerant charge, EEV (electronic expansion valve) opening, and internal heat exchanger under cooling mode. The performance characteristics of CO2 heat pump system were tested by using an air enthalpy calorimeter. In the case of the CO2 heat pump system without internal heat exchanger, the opening of #3 EEV and #4 EEV was 60% and refrigerant charge amount was 5,600g. However, in the case of that with internal heat exchanger, the best performance was obtained when the opening of #2 EEV is 20%. From the present studies, it was observed that the performance variation and operational characteristics of the CO2 heat pump system were affected by design factors like refrigerant charge amount, EEV opening, and internal heat exchanger and thereby, the configuration on an optimal operation conditions of the system was enabled.

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