scholarly journals Heat pump working fluid selection—economic and thermodynamic comparison of criteria and boundary conditions

2019 ◽  
Vol 98 ◽  
pp. 500-513 ◽  
Author(s):  
Benjamin Zühlsdorf ◽  
Jonas Kjær Jensen ◽  
Brian Elmegaard
Keyword(s):  
Boundary Conditions ◽  
Heat Pump ◽  
Working Fluid ◽  
Working Fluid Selection

Automotive waste heat recovery: Working fluid selection and related boundary conditions

2015 ◽  
Vol 16 (3) ◽  
pp. 399-409 ◽  
Author(s):  
S. Glover ◽  
R. Douglas ◽  
L. Glover ◽  
G. McCullough ◽  
S. McKenna
Keyword(s):  
Boundary Conditions ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Working Fluid ◽  
Working Fluid Selection

An experimental evaluation of R11 as a heat pump working fluid in comparison with some other working fluids

1983 ◽  
Vol 7 (2) ◽  
pp. 129-135
Author(s):  
S. E. Ogbeide ◽  
S. A. K. El-Meniawy ◽  
S. Devotta ◽  
F. A. Watson ◽  
F. A. Holland
Keyword(s):  
Heat Pump ◽  
Experimental Evaluation ◽  
Working Fluid ◽  
Working Fluids

scholarly journals Performance Research on Heat Pump Using Blends of R744 with Eco-friendly Working Fluid

2017 ◽  
Vol 205 ◽  
pp. 2297-2302 ◽  
Author(s):  
Xianping Zhang ◽  
Fang Wang ◽  
Zhiming Liu ◽  
Junjie Gu ◽  
Feiyu Zhu ◽  
...  
Keyword(s):  
Heat Pump ◽  
Working Fluid ◽  
Performance Research

Performance Evaluation of a Vertical U-Tube Ground Heat Exchanger Using a Numerical Simulation Approach

2013 ◽  
Vol 724-725 ◽  
pp. 909-915
Author(s):  
Ping Fang Hu ◽  
Zhong Yi Yu ◽  
Fei Lei ◽  
Na Zhu ◽  
Qi Ming Sun ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Performance Evaluation ◽  
Heat Exchanger ◽  
Heat Pump ◽  
Heat Transfer Process ◽  
Working Fluid ◽  
Outlet Temperature ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Ground Source

A vertical U-tube ground heat exchanger can be utilized to exchange heat with the soil in ground source heat pump systems. The outlet temperature of the working fluid through the U-tube not only accounts for heat transfer capacity of a ground heat exchanger, but also greatly affects the operational efficiency of heat pump units, which is an important characteristic parameter of heat transfer process. It is quantified by defining a thermal effectiveness coefficient. The performance evaluation is performed with a three dimensional numerical model using a finite volume technique. A dynamic simulation was conducted to analyze the thermal effectiveness as a function of soil thermal properties, backfill material properties, separation distance between the two tube legs, borehole depth and flow velocity of the working fluid. The influence of important characteristic parameters on the heat transfer performance of vertical U-tube ground heat exchangers is investigated, which may provide the references for the design of ground source heat pump systems in practice.

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