97/03239 Optimal coefficient of performance and heating load relationship of a three-heat-reservoir endoreversible heat pump

1997 ◽  
Vol 38 (4) ◽  
pp. 263
Keyword(s):  
Heat Pump ◽  
Coefficient Of Performance ◽  
Heat Reservoir ◽  
Heating Load ◽  
Optimal Coefficient ◽  
Relationship Of

The Optimal Performance of a Carnot Heat Pump under the Condition of Mixed Heat Resistance

2002 ◽  
Vol 09 (03) ◽  
pp. 251-256 ◽  
Author(s):  
Xiaoqin Zhu ◽  
Lingen Chen ◽  
Fengrui Sun ◽  
Chih Wu
Keyword(s):  
Heat Resistance ◽  
Heat Pump ◽  
Optimal Performance ◽  
Coefficient Of Performance ◽  
Heating Load ◽  
Optimal Coefficient ◽  
The Relationship

The optimal performance of an endoreversible Carnot heat pump under the condition of mixed heat resistance is investigated. The relationship between the optimal coefficient of performance (COP) and the heating load is derived.

Optimal Performance of an Endoreversible Four-Heat-Reservoir Absorption Heat-Transformer

2004 ◽  
Vol 11 (02) ◽  
pp. 147-159 ◽  
Author(s):  
Xiaoyong Qin ◽  
Lingen Chen ◽  
Fengrui Sun ◽  
Chih Wu
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Heat Transfer Surface ◽  
Coefficient Of Performance ◽  
Heat Reservoir ◽  
Cycle Model ◽  
Surface Areas ◽  
Heating Load ◽  
Temperature Levels ◽  
Heat Transformer

Based on an endoreversible absorption heat-transformer cycle model operating between four temperature levels with linear (Newtonian) heat transfer law, the fundamental optimal relation between the specific heating load and the coefficient of performance, the optimal temperatures of the working substance, and the optimal heat transfer surface areas of the four heat exchangers are derived by using finite-time thermodynamics. Moreover, the effects of the cycle parameters on the cycle characteristic are studied by numerical examples. The results obtained herein can provide some guidance for the optimal design of absorption heat-transformers.

Heat transfer effect on optimal performance of two-stage thermoelectric heat pumps

2007 ◽  
Vol 221 (12) ◽  
pp. 1635-1641 ◽  
Author(s):  
L Chen ◽  
J Li ◽  
F Sun
Keyword(s):  
Heat Transfer ◽  
Heat Pump ◽  
Analytical Formula ◽  
Electrical Current ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Two Stage ◽  
Thermo Electric ◽  
Heating Load ◽  
Thermoelectric Heat

A model of two-stage semiconductor thermoelectric heat pumps with external heat transfer and internal irreversibility is built. Performance of the heat pump with Newton's heat transfer law is analysed and optimized using the combination of finite-time thermodynamics and non-equilibrium thermodynamics. The analytical formula about heating load versus working electrical current, and the coefficient of performance (COP) versus working electrical current are derived. For the fixed total number of thermoelectric elements, the ratio of number of thermo-electric elements of top stage to the total number of thermoelectric elements is also optimized for maximizing the heating load and the COP of the thermoelectric heat pump. The effects of design factors on the performance are analysed.

Performance Optimization of a Combined Heat Pump Cycle

2003 ◽  
Vol 10 (04) ◽  
pp. 377-389 ◽  
Author(s):  
Lingen Chen ◽  
Yuehong Bi ◽  
Fengrui Sun ◽  
Chih Wu
Keyword(s):  
Heat Resistance ◽  
Steady Flow ◽  
Heat Pump ◽  
Performance Optimization ◽  
Coefficient Of Performance ◽  
Cycle Model ◽  
Heat Leakage ◽  
Heating Load ◽  
Internal Irreversibility ◽  
Optimal Heating

A steady flow combined heat pump cycle model with heat resistance, heat leakage and internal irreversibility is built in this paper. The optimal performance of the model is studied. The relation between optimal heating load and coefficient of performance (COP), as well as the maximum COP and the corresponding heating load are derived.

scholarly journals Development and Validation of Air-to-Water Heat Pump Model for Greenhouse Heating

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4714
Author(s):  
Adnan Rasheed ◽  
Wook Ho Na ◽  
Jong Won Lee ◽  
Hyeon Tae Kim ◽  
Hyun Woo Lee
Keyword(s):  
Heat Pump ◽  
Storage Tank ◽  
Energy Requirement ◽  
Water Storage ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Water Storage Tank ◽  
National University ◽  
Heating Load ◽  
Development And Validation

This study proposes a building energy simulation (BES) model of an air-to-water heat pump (AWHP) system integrated with a multi-span greenhouse using the TRNSYS-18 program. The proposed BES model was validated using an experimental AWHP and a multi-span greenhouse installed in Kyungpook National University, Daegu, South Korea (latitude 35.53° N, longitude 128.36° E, elevation 48 m). Three AWHPs and a water storage tank were used to fulfill the heat energy requirement of the three-span greenhouse with 391.6 m2 of floor area. The model was validated by comparing the following experimental and simulated results, namely, the internal greenhouse temperature, the heating load of the greenhouse, heat supply from the water storage tank to the greenhouse, heat pumps’ output water temperature, power used by the heat pumps, coefficient of performance (COP) of the heat pump, and water storage tank temperature. The BES model’s performance was evaluated by calculating the root mean square error (RMSE) and the Nash–Sutcliffe efficiency (NSE) coefficient of validation results. The overall results correlated well with the experimental and simulated results and encouraged adopting the BES model. The average calculated COP of the AWHP was 2.2 when the outside temperature was as low as −13 °C. The proposed model was designed simply, and detailed information of each step is provided to make it easy to use for engineers, researchers, and consultants.

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