scholarly journals Optimised Liquid Flooded Gas Cycle for Heat Pump and External Heat Engine Applications

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Chris Benson
Keyword(s):  
Heat Pump ◽  
Heat Engine ◽  
External Heat

scholarly journals Chart for Thermoelectric Systems Operation Based on a Ternary Diagram for Bithermal Systems

Entropy ◽  
2018 ◽  
Vol 20 (9) ◽  
pp. 666
Author(s):  
Julien Ramousse ◽  
Christophe Goupil
Keyword(s):  
Heat Pump ◽  
Heat Engine ◽  
Ternary Diagram ◽  
Operating Conditions ◽  
Thermal Dissipation ◽  
Maximum Efficiency ◽  
Joule Effect ◽  
Parametric Curve ◽  
Thermoelectric Systems ◽  
The Impact

Thermoelectric system’s operation needs careful attention to ensure optimal power conversion depending on the application aims. As a ternary diagram of bithermal systems allows a synthetic graphical analysis of the performance attainable by any work-heat conversion system, thermoelectric systems operation is plotted as a parametric curve function of the operating conditions (electric current and reservoirs’ temperature), based on the standard model of Ioffe. The threshold of each operating mode (heat engine, heat pump, thermal dissipation, and forced thermal transfer), along with the optimal efficiencies and powers of the heat pump and heat engine modes, are characterized graphically and analytically as a function of the material properties and the operating conditions. The sensibility of the performance aims (maximum efficiency vs. maximum power) with the operating conditions is, thus, highlighted. In addition, the specific contributions of each phenomenon involved in the semiconductor (reversible Seebeck effect, irreversible heat leakage by conduction and irreversible thermal dissipation by Joule effect) are discussed in terms of entropy generation. Finally, the impact of the exo-irreversibilities on the performance is analyzed by taking the external thermal resistances into account.

Stirling Heat Pump External Heat Systems: An Appliance Perspective

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

The Norwich Heat Pump

1948 ◽  
Vol 158 (1) ◽  
pp. 22-29 ◽  
Author(s):  
J. A. Sumner
Keyword(s):  
Great Britain ◽  
Heat Pump ◽  
Heat Engine ◽  
Electric Energy ◽  
Large Block ◽  
Coefficient Of Performance ◽  
Heating Season ◽  
Final Temperature ◽  
Financial Saving ◽  
Large Heat

The paper provides the history and constructional details and working results of what is believed to be the first large heat pump used for building heating in Great Britain. This machine was constructed and installed as an experimental machine for heating a large block of municipal buildings in Norwich. A brief explanation indicating the principle upon which the heat pump works is given. Reference is also made to the differences between the reversed heat engine when working as a refrigerator and when working as a heat pump. In the latter case there is a deliberate increase in the final temperature T1, from approximately 85 deg. F. to temperatures which may be of the order of 150–200 deg. F. The unsuitability of the term “coefficient of performance”—normally used as a criterion of refrigerator performance—when used as a coefficient relating to the heat pump is pointed out; and the use of a new, alternative term is suggested. The results are shown of operating the Norwich Heat Pump for two winter heating seasons. When using an unsuitable compressor the heat delivered to the building was found to be 3·45 times greater than the equivalent heat (electric) energy required to operate the machine, averaged over the 1945–6 winter heating season. With a more efficient compressor, installed later in 1946, a still better performance is anticipated. The actual costs of heating the building, with coal-fired boilers and a heat pump respectively, are shown in the form of a table. Conclusions indicated are that the heat pump can show a financial saving, as compared with the use of coal-fired boilers, and that it is practicable to use the heat pump in Great Britain for building heating throughout normal English winters.

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

scholarly journals STOCHASTIC ENERGETICS OF A BROWNIAN MOTOR AND REFRIGERATOR DRIVEN BY NONUNIFORM TEMPERATURE

2014 ◽  
Vol 28 (08) ◽  
pp. 1450055 ◽  
Author(s):  
RONALD BENJAMIN
Keyword(s):  
Heat Pump ◽  
Linear Response ◽  
Heat Engine ◽  
Temperature Profiles ◽  
Nonuniform Temperature ◽  
Brownian Motor ◽  
Linear Response Regime ◽  
Stochastic Energetics ◽  
Parameter Values

The energetics of a Brownian heat engine and heat pump driven by position dependent temperature, known as the Büttiker–Landauer heat engine and heat pump, is investigated by numerical simulations of the inertial Langevin equation. We identify parameter values for optimal performance of the heat engine and heat pump. Our results qualitatively differ from approaches based on the overdamped model. The behavior of the heat engine and heat pump, in the linear response regime is examined under finite time conditions and we find that the efficiency is lower than that of an endoreversible engine working under the same condition. Finally, we investigate the role of different potential and temperature profiles to enhance the efficiency of the system. Our simulations show that optimizing the potential and temperature profile leads only to a marginal enhancement of the system performance due to the large entropy production via the Brownian particle's kinetic energy.

scholarly journals Electricity Generation Using a Hybridized Zeolite Adsorption Heat Pump and Heat Engine

2020 ◽  
Vol 12 (4) ◽  
pp. 75
Author(s):  
Linus Kweku Labik ◽  
Bright Kwakye-Awuah ◽  
Baah Sefa-Ntiri ◽  
Eric Kwabena Kyeh Abavare ◽  
Isaac Nkrumah ◽  
...  
Keyword(s):  
Energy Storage ◽  
Heat Pump ◽  
Electricity Generation ◽  
Storage System ◽  
Heat Engine ◽  
Adsorbed Water ◽  
Energy Storage System ◽  
Adsorption Heat ◽  
Average Temperature ◽  
Adsorption Heat Pump

The use of adsorption in Thermal Energy Storage has gained considerable research interest of late. Some applications have focused on the use of TES for transformation of low temperature heat in applications such as cooling and heating. Zeolite and water have been studied as suitable materials. Their characteristics as environmentally friendly materials and high affinity makes them conspicuous. The unique properties of zeolites to hold adsorbed water/heat with very minimal loss is also significant. With the aid of a dynamo, a Stirling engine as heat engine and the adsorption energy storage system serving as heat pump was used to generate electricity. The relationship between electricity generation and temperature was investigated. The obtained average temperature and pressure of the zeolite - water adsorption heat pump was also compared with the basic adsorption cycle.

Sign in / Sign up

Export Citation Format

Share Document