Heat pump assisted distillation. III: Experimental studies using an external heat pump

1986 ◽  
Vol 10 (3) ◽  
pp. 255-276 ◽  
Author(s):  
S. Supranto ◽  
Ishwar Chandra ◽  
M. B. Unde ◽  
P. J. Diggory ◽  
F. A. Holland
Keyword(s):  
Heat Pump ◽  
Experimental Studies ◽  
External Heat

Stirling Heat Pump External Heat Systems: An Appliance Perspective

1992 ◽  
Author(s):  
Andrew D. Vasilakis ◽  
John F. Thomas
Keyword(s):  
Heat Pump ◽  
External Heat

scholarly journals Experimental studies of energy efficiency of heat pump equipment for hot water supply and air conditioning systems in apartment buildings

2021 ◽  
Vol 937 (4) ◽  
pp. 042037
Author(s):  
Gregory Vasilyev ◽  
Victor Gornov ◽  
Marina Kolesova ◽  
Vitaliy Leskov ◽  
Victoria Silaeva ◽  
...  
Keyword(s):  
Water Supply ◽  
Heat Pump ◽  
Air Conditioning ◽  
Energy Savings ◽  
Experimental Studies ◽  
Hot Water ◽  
Apartment Buildings ◽  
Pump Equipment ◽  
Hot Water Supply ◽  
Air Conditioning Systems

Abstract Experimental studies of this article are aimed at solving the problem of reforming the housing and communal services of Russia through rational integration of non-traditional energy sources and secondary energy resources into the energy balance of buildings and structures. An important component of the work was the creation and development of industrial production of reliable competitive heat pump systems of a new generation, cogenerating heat energy and cold in an autonomous mode and providing energy savings of at least 50% due to the combined use of low-potential thermal energy of the soil, the atmospheric air and the exhaust air of ventilation systems for hot water supply and air conditioning systems of apartment buildings.

scholarly journals Air Heat Pump in Wind Power

2020 ◽  
Vol 63 (3) ◽  
pp. 264-284
Author(s):  
L. I. Gretchikhin ◽  
A. I. Hutkouski
Keyword(s):  
Heat Pump ◽  
High Speed ◽  
Conversion Coefficient ◽  
Air Flow ◽  
Experimental Studies ◽  
Energy System ◽  
Flow Speed ◽  
Back Side ◽  
Electric Generator ◽  
Propeller Blades

An experimental facility has been developed and manufactured to study the disruptive flow in an air heat pump. The propeller of the heat pump does not produce pulling or pushing forces. The external air flow is created by a high speed propeller perpendicular to the plane of rotation of the heat pump propeller and acts as a ventilator. Herewith, a disruptive flow in the back side of the heat pump propeller is being created and conditions for converting the thermal component of the ventilator air flow into electrical energy by an electric power generator are realized. An aerodynamic model of the flow around the propeller blades of the heat pump in mutually perpendicular airflow has been developed. Experimental studies of the operating propeller as a heat pump, taking into account the friction during rotation of the rotor in the stator of the electric generator, were carried out. In order for the air heat pump to perceive the impacting air flow from the ventilator, it must rotate with minimal power. As a result, for two standard twin-bladed propellers mounted on a 100 W engine under the wind generated by the ventilator which speed is 2.17 m/s the conversion factor was 5.04. As the speed of air flow from the ventilator increased, the  conversion  coefficient  decreased  sharply.  When  placing  the  two  specified  propellers  on a 300 W motor, the minimum pre-rotation power was 5.7 W. In this case, when an air flow speed is of 1.08 m/s, the conversion coefficient reached only 2.93 and also fell sharply with the increase in the air flow speed. When a three-blade propeller with blades was used on a 300 W motor, then situation has changed dramatically. When the motor with a special propeller with a power of 12.1 W was spun and the air flow was formed at a speed of 3.2 m/s, the conversion coefficient was 12.4. With the reduction in the power of the spinup down to 5.9 W and in the speed of the air flow created by the ventilator to 1.7 m/s, the conversion coefficient increased to 14.9. The theoretical calculation of heat pump conversion coefficient is confirmed by experimental data. The conditions under which this coefficient reaches its maximum value are set. Computer modeling of different designs of heat pump propeller blades was performed. It is demonstrated that an air heat pump is a complex open energy system.

scholarly journals Modeling of the heat transfer process in an air heat pump fanless evaporator

2018 ◽  
Vol 240 ◽  
pp. 05012
Author(s):  
Piotr Kopeć ◽  
Beata Niezgoda-Żelasko
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Mixed Convection ◽  
Heat Pump ◽  
Transfer Process ◽  
Experimental Studies ◽  
Heat Transfer Process ◽  
Cfd Modeling ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

This paper analyses the mixed convection process in a fanless evaporator of an air heat pump. The text of the paper shows the authors’ experimental studies results of the temperature distribution and the local values of heat transfer coefficients on the outer surface of vertical tubes with longitudinal fins for the case of mixed convection and fins of a specific shape of their cross-section (prismatic, wavy fins). The experimental studies include the air velocities wa=2,3 m/s and the temperature differences between air and the refrigerant inside the heat exchanger tubes which is ΔT=24-40K. The results obtained were used for verification of CFD modeling of the heat transfer process for the discussed case of heat transfer and the geometry of the finned surface. The numerical analysis was performed for: the temperature distribution along the fin height, the tube perimeter and height, the distribution of local heat transfer coefficients on the finned tube perimeter and along its height. The simulated calculations were used to verify the method of determination of fin efficiency.

scholarly journals Model Verification and Justification Study of Spirally Corrugated Pipes in a Ground-Air Heat Exchanger Application

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4047 ◽  
Author(s):  
Kwang-Seob Lee ◽  
Eun-Chul Kang ◽  
Yu-Jin Kim ◽  
Euy-Joon Lee
Keyword(s):  
Heat Pump ◽  
High Performance ◽  
Selection Process ◽  
Thermal Power ◽  
Experimental Studies ◽  
Model Verification ◽  
Design Guideline ◽  
Market Growth ◽  
Ground Source ◽  
Parametric Studies

Ground-air heat exchangers have become an important topic in recent years due to their contributions to the market growth of the ground source heat pump industry. This paper provides a comprehensive study and recommends suggestions on the selection process of a suitable pipe for an air-to-water heat pump (AWHP). Parametric studies including material, turbulent plate quantity, and pipe type were performed to identify an optimal pipe design for high-performance AWHP. Both numerical and experimental studies were carried out to validate current pipe models. Overall, there was good agreement between the numerical model and experimental results. It was determined that a spirally corrugated pipe exhibited excellent thermal power generation with little compromising pressure drop. Finally, a pipe selection example was demonstrated as a design guideline to size an optimal pipe for AWHP application.

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