Thermodynamics Performance Study on Water Source Heat Pump in Variant Operating Condition

2009 ◽  
Vol 20 (4) ◽  
pp. 517-532 ◽  
Author(s):  
Guozhong Zheng ◽  
Youyin Jing
Keyword(s):  
Heat Pump ◽  
Cooling Water ◽  
Water Source ◽  
Heat Pumps ◽  
Exergy Efficiency ◽  
Coefficient Of Performance ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Performance Study ◽  
Operating Condition

Water source heat pumps have outstanding advantages: significant energy conservation, working stability and notable pollution reduction. In this paper, the benefits and features of the water source heat pump are described. Then the methodology for studying the thermodynamics performance in variant conditions is described and the thermodynamics analysis of a specific water source heat pump is presented based on the first law of thermodynamics and exergy analysis theory to study the thermodynamics performance in variant condition. Coefficient of Performance (COP) and exergy efficiency in variant operating condition are calculated. The relation of COP and exergy efficiency with the outlet temperature of the chilled water and the inlet temperature of the cooling water are respectively studied. The operating strategies of both summer and winter condition are then concluded. Finally, the thermodynamics performance of the water source heat pump is compared with the other common refrigerating and heating equipments. It is concluded that the water source heat pump has great advantage over others in terms of energy saving. It is expected that the study would be beneficial to the researchers and engineers.

Annual pattern of the coefficient of performance considering several heat pump types and its environmental consequences

2014 ◽  
Vol 5 (2) ◽  
pp. 173-179
Author(s):  
T. Buday ◽  
Gy. Szabó ◽  
I. Fazekas ◽  
M. Paládi ◽  
Sz. Szabó ◽  
...  
Keyword(s):  
Heat Pump ◽  
Water Source ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Conventional Heating ◽  
Temperature Pattern ◽  
Ground Source Heat Pump ◽  
Environmental Consequences ◽  
Ground Source ◽  
Heating Mode

Heating with the use of ambient energy by heat pumps is a very effective way to reduce CO2 emission. However, efficiency, economic and environmental advantages depend on the type of the heat pump and the temperature of the source, the latter usually changes during the heating season. The aim of the paper is to give the annual pattern of the COP and emission as a function of the typical source temperature pattern, moreover yearly summarized energetic and emission values are also added in the case of air source, water source and ground source heat pump systems, compared to some conventional heating mode.

Performance Study of Activated Carbon – Hydrofluoro Olefin Based Adsorption Cooling System

2013 ◽  
Vol 465-466 ◽  
pp. 206-210
Author(s):  
Khairul Habib
Keyword(s):  
Activated Carbon ◽  
Waste Heat ◽  
Cooling System ◽  
Combustion Engine ◽  
Cooling Water ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Inlet Temperature ◽  
Performance Study ◽  
Adsorption Chiller

In this study, a dynamic behavior of a two bed adsorption chiller has been analyzed using highly porous activated carbon of type Maxsorb III as adsorbent and hydrofluoro olefin [R1234ze (E)] as refrigerant. R1234ze (E) has a low global warming potential (GWP) and zero ozone depletion potential (ODP). A parametric study has been presented where the effects of adsorption/desorption cycle time, cooling water inlet temperature and regeneration temperature on the performance are reported in terms of cooling capacity and coefficient of performance (COP). This chiller can be driven by the waste heat of internal combustion engine and hence it is applicable in automobile air conditioning.

Performance and Exergy Analysis of Open Absorption Heat Pump

2014 ◽  
Vol 953-954 ◽  
pp. 667-672
Author(s):  
Fan Wei ◽  
Shi Jie Zhang ◽  
Yun Han Xiao
Keyword(s):  
Heat Pump ◽  
Flue Gas ◽  
Heat Recovery ◽  
Exergy Analysis ◽  
Cooling Water ◽  
Exergy Efficiency ◽  
Exergy Loss ◽  
Coefficient Of Performance ◽  
Absorption Heat Pump ◽  
Simulation Results

An open absorption heat pump(OAHP) in second type was built in this paper in order to recycle the heat and water from the flue gas. the coefficient of performance(COP) and the exergy efficiency were analyzed with the method of process simulation. Results showed the COP is 0.64, and latent heat recovery ratio is 19.6%. The temperature and humidity of flue gas, the temperature and flowrate of cooling water would influence on the COP. The increase of these parameters would lead to COP increase. The exergy efficiency of the system was 19.2%. The absorber, the generator and the condenser produce most exergy loss. The exergy efficiency of condensation was 0, which was using to recovery condensation water. The exergy efficiency would be strengthen by reducing the exergy loss of absorber and generator.

Study on a Newly Absorption Heat Pump District Heating System

2009 ◽  
Author(s):  
Peng Hu ◽  
Lin Fu ◽  
Shigang Zhang ◽  
Yong Luo ◽  
Changlei Xiao
Keyword(s):  
Heat Pump ◽  
Cooling Water ◽  
District Heating ◽  
Demonstration Project ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Pipe Network ◽  
Heating Season ◽  
District Heating System ◽  
Absorption Heat Pump

Combined heat and power (CHP) has higher efficiency than other heating supply methods. However, the total heating supply capacity from CHP plants will soon be lower than the total heating demand in Beijing by 2010. Investigation showed that 10% to 20% of total energy consumption was rejected to the surroundings through cooling water in CHP plants. The cooling water temperature leaving the condenser is normally in the range of 20–35°C during the heating season. This temperature is too low to be used for heating purpose. The total quantity of rejected heat is roughly equivalent to the energy to condition (heating) 25 million m2 building areas. Although circulating water in power plants has many advantages compared with other HP heat sources commonly used, it’s nearly impossible to operate a pipe network with such a small ΔT (10∼15°C) economically. A newly solution based on absorption heat pump (HP) was investigated and a smallscale demonstration project was built in Chifeng, a city of Inner Mongolia in North China. In such a newly district heating (DH) System, the primary pipe network will operate in ΔT of ≈100°C without any change in both outlet temperature of CHP sources and operating temperature of secondary pipe network. Inlet temperature of primary pipe network decreased to 20∼25°C, which makes possibility for waste heat recovery of circulating cooling water in most CHP plants. Comprehensive efficiency in CHP plants will improve 10% ∼ 20% theoretically. Operation effect during whole heating season of the demonstration project was also introduced.

Analysis of Screw Chiller's Refrigeration Performance under Large Temperature Difference Cooling-Water

2014 ◽  
Vol 501-504 ◽  
pp. 2319-2322
Author(s):  
Gang Chen ◽  
Xin Cheng
Keyword(s):  
Theoretical Calculation ◽  
Water Flow ◽  
Cooling Water ◽  
Coefficient Of Performance ◽  
Large Temperature ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Cooling Water Temperature ◽  
State Of Affairs ◽  
Unit Performance

This paper using river water as cooling-water to theoretical calculation the refrigerating unit performance of screw chiller. To calculate the change of cooling water flow affected the coefficient of performance under a certain inlet temperature, and compare with other state of affairs. Through the analysis, it could found out that when the cooling-water temperature range between 24~28°C while the outlet temperature is 37°C, it can enhance the refrigerating unit coefficient of performance by reduce the cooling-water flow within limits.

Experimental investigation on water quality standard of Yangtze River water source heat pump

2012 ◽  
Vol 66 (5) ◽  
pp. 1103-1109 ◽  
Author(s):  
Zenghu Qin ◽  
Mingwei Tong ◽  
Lin Kun
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
River Water ◽  
Heat Pump ◽  
Yangtze River ◽  
Water Source ◽  
Quality Standard ◽  
Heat Pumps ◽  
The Yangtze River ◽  
Water Conditions

Due to the surface water in the upper reaches of Yangtze River in China containing large amounts of silt and algae, high content of microorganisms and suspended solids, the water in Yangtze River cannot be used for cooling a heat pump directly. In this paper, the possibility of using Yangtze River, which goes through Chongqing, a city in southwest China, as a heat source–sink was investigated. Water temperature and quality of the Yangtze River in the Chongqing area were analyzed and the performance of water source heat pump units in different sediment concentrations, turbidity and algae material conditions were tested experimentally, and the water quality standards, in particular surface water conditions, in the Yangtze River region that adapt to energy-efficient heat pumps were also proposed. The experimental results show that the coefficient of performance heat pump falls by 3.73% to the greatest extent, and the fouling resistance of cooling water in the heat exchanger increases up to 25.6% in different water conditions. When the sediment concentration and the turbidity in the river water are no more than 100 g/m3 and 50 NTU respectively, the performance of the heat pump is better, which can be used as a suitable river water quality standard for river water source heat pumps.

scholarly journals Heat Pump Bridge Analysis Using the Modified Energy Transfer Diagram

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 137
Author(s):  
Florian Schlosser ◽  
Heinrich Wiebe ◽  
Timothy G. Walmsley ◽  
Martin J. Atkins ◽  
Michael R. W. Walmsley ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Heat Pump ◽  
Heat Recovery ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Combined Application ◽  
Recovery Potential ◽  
Composite Curve ◽  
And Performance ◽  
The Individual

Heat pumps are the key technology to decarbonise thermal processes by upgrading industrial surplus heat using renewable electricity. Existing insight-based integration methods refer to the idealised Grand Composite Curve requiring the full exploitation of heat recovery potential but leave the question of how to deal with technical or economic limitations unanswered. In this work, a novel Heat Pump Bridge Analysis (HPBA) is introduced for practically targeting technical and economic heat pump potential by applying Coefficient of Performance curves into the Modified Energy Transfer Diagram (METD). Removing cross-Pinch violations and operating heat exchangers at minimum approach temperatures by combined application of Bridge Analysis increases the heat recovery rate and reduce the temperature lift to be pumped at the same time. The insight-based METD allows the individual matching of heat surpluses and deficits of individual streams with the capabilities and performance of different market-available heat pump concepts. For an illustrative example, the presented modifications based on HPBA increase the economically viable share of the technical heat pump potential from 61% to 79%.

scholarly journals Factors Shaping A/W Heat Pumps CO₂ Emissions—Evidence from Poland

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1576
Author(s):  
Piotr Jadwiszczak ◽  
Jakub Jurasz ◽  
Bartosz Kaźmierczak ◽  
Elżbieta Niemierka ◽  
Wandong Zheng
Keyword(s):  
Air Quality ◽  
Power System ◽  
Heat Pump ◽  
Heat Pumps ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Conventional Heating ◽  
Additional Stress ◽  
The European Union ◽  
Energy Mix

Heating and cooling sectors contribute to approximately 50% of energy consumption in the European Union. Considering the fact that heating is mostly based on fossil fuels, it is then evident that its decarbonization is one of the crucial tasks for achieving climate change prevention goals. At the same time, electricity sectors across the globe are undergoing a rapid transformation in order to accommodate the growing capacities of non-dispatchable solar and wind generators. One of the proposed solutions to achieve heating sector decarbonization and non-dispatchable generators power system integration is sector coupling, where heat pumps are perceived as a perfect fit. Air source heat pumps enable a rapid improvement in local air quality by replacing conventional heating sources, but at the same time, they put additional stress on the power system. The emissions associated with heat pump operation are a combination of power system energy mix, weather conditions and heat pump technology. Taking the above into consideration, this paper presents an approach to estimate which of the mentioned factors has the highest impact on heat pump emissions. Due to low air quality during the heating season, undergoing a power system transformation (with a relatively low share of renewables) in a case study located in Poland is considered. The results of the conducted analysis revealed that for a scenario where an air-to-water (A/W) heat pump is supposed to cover space and domestic hot water load, its CO2 emissions are shaped by country-specific energy mix (55.2%), heat pump technology (coefficient of performance) (33.9%) and, to a lesser extent, by changing climate (10.9%). The outcome of this paper can be used by policy makers in designing decarbonization strategies and funding distribution.

scholarly journals Experiment Study on Performance of Air Source Heat Pump

2013 ◽  
Vol 805-806 ◽  
pp. 645-648
Author(s):  
Wei Xiu Shi ◽  
Li Sheng Pan
Keyword(s):  
Heat Pump ◽  
Temperature Difference ◽  
Heat Pumps ◽  
Outlet Temperature ◽  
Exhaust Temperature ◽  
Air Source Heat Pump ◽  
And Performance ◽  
Save Energy ◽  
C 30 ◽  
Set Up

Under the situation of energy crisis, air source heat pumps are paid more attention recently. In order to save energy, the feasibility and performance of air source heat pump are studied by experiment, and variation laws of exhaust temperature, evaporator outlet temperature and outlet presser of compressor were analyzed in this paper. Air source heat pump apparatus were set up and the experiment was during 10°C, 20°C, 30°C and 40°C. The results were as follows: exhaust temperature of compressor increases gradually with the increase of tank temperature, but the temperature difference between exhaust temperature of compressor and tank temperature becomes little; temperature difference in evaporator decreases; Compressor outlet pressure increases obviously.

Performance Research of Air-Cooled Heat Pump for Small Residential

2012 ◽  
Vol 516-517 ◽  
pp. 1180-1183
Author(s):  
Hui Fan Zheng ◽  
Chun Li Yang ◽  
Yan Hua Li ◽  
Yao Hua Liang
Keyword(s):  
Experimental Data ◽  
Heat Pump ◽  
Cooling Water ◽  
Cooling Capacity ◽  
Least Square ◽  
Outdoor Environment ◽  
Experimental Setup ◽  
Outlet Temperature ◽  
Pump System ◽  
Environment Temperature

An experimental setup is designed and built to study the operation characteristics of the air-cooled heat pump system for small residential in this paper. Based on the experimental setup, the characteristics of the energy efficiency ratio(EER) and cooling capacity have been researched when the outlet temperature of cooling water and outdoor environment temperature change. The experimental data demonstrate that the cooling capacity and EER of the system increases with increasing outlet cooling water temperatures and decreases with increasing outdoor environment temperatures. In addition, the correlation of the system EER is calculated by using the least square method based on the experimental data.

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