Simulation of melting of ice in a porous media under multiple constant temperature heat sources using a combined transfinite interpolation and PDE methods

2006 ◽  
Vol 61 (14) ◽  
pp. 4571-4581 ◽  
Author(s):  
P. Rattanadecho
Keyword(s):  
Porous Media ◽  
Constant Temperature ◽  
Heat Sources ◽  
Transfinite Interpolation ◽  
Temperature Heat ◽  
Pde Methods

MODELING OF AN ORGANIC RANKINE CYCLE FOR LOW TEMPERATURE HEAT SOURCES

2018 ◽  
Author(s):  
Arthur Batista Martins Lott ◽  
Arthur Pacheco Luz ◽  
João Arthur Daconti Silva ◽  
Cristiana Maia ◽  
Sergio Hanriot
Keyword(s):  
Low Temperature ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Heat Sources ◽  
Temperature Heat

scholarly journals Analysis and Comparison of Some Low-Temperature Heat Sources for Heat Pumps

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1853 ◽  
Author(s):  
Pavel Neuberger ◽  
Radomír Adamovský
Keyword(s):  
Heat Transfer ◽  
Low Temperature ◽  
Heat Source ◽  
Heat Pump ◽  
Heat Exchangers ◽  
Ambient Air ◽  
Heat Transfer Fluid ◽  
Heat Sources ◽  
Ground Heat Exchangers ◽  
Temperature Heat

The efficiency of a heat pump energy system is significantly influenced by its low-temperature heat source. This paper presents the results of operational monitoring, analysis and comparison of heat transfer fluid temperatures, outputs and extracted energies at the most widely used low temperature heat sources within 218 days of a heating period. The monitoring involved horizontal ground heat exchangers (HGHEs) of linear and Slinky type, vertical ground heat exchangers (VGHEs) with single and double U-tube exchanger as well as the ambient air. The results of the verification indicated that it was not possible to specify clearly the most advantageous low-temperature heat source that meets the requirements of the efficiency of the heat pump operation. The highest average heat transfer fluid temperatures were achieved at linear HGHE (8.13 ± 4.50 °C) and double U-tube VGHE (8.13 ± 3.12 °C). The highest average specific heat output 59.97 ± 41.80 W/m2 and specific energy extracted from the ground mass 2723.40 ± 1785.58 kJ/m2·day were recorded at single U-tube VGHE. The lowest thermal resistance value of 0.07 K·m2/W, specifying the efficiency of the heat transfer process between the ground mass and the heat transfer fluid, was monitored at linear HGHE. The use of ambient air as a low-temperature heat pump source was considered to be the least advantageous in terms of its temperature parameters.

scholarly journals R1234yf and R1234ze as alternatives to R134a in Organic Rankine Cycles for low temperature heat sources

2017 ◽  
Vol 142 ◽  
pp. 1192-1198 ◽  
Author(s):  
Francisco Molés ◽  
Joaquín Navarro-Esbrí ◽  
Bernardo Peris ◽  
Adrián Mota-Babiloni ◽  
Carlos Mateu-Royo
Keyword(s):  
Low Temperature ◽  
Heat Sources ◽  
Temperature Heat ◽  
Organic Rankine Cycles

Combined Cycle for Power Generation and Refrigeration Using Low Temperature Heat Sources

2014 ◽  
Vol 3 (3) ◽  
pp. 34-56 ◽  
Author(s):  
Vijay Chauhan ◽  
P. Anil Kishan ◽  
Sateesh Gedupudi
Keyword(s):  
Power Generation ◽  
Low Temperature ◽  
Combined Cycle ◽  
Working Fluid ◽  
Heat Sources ◽  
Ambient Temperatures ◽  
Temperature Heat ◽  
Good Potential ◽  
Output Ratio ◽  
Operation Results

A combined refrigeration and power cycle, which uses ammonia-water as the working fluid, is proposed by combining Rankine and vapour absorption cycles with an advantage of varying refrigeration capacity to power output ratio. The study investigates the usage of low temperature heat sources for the cycle operation. Results of parametric analysis are presented, which show the scope for optimization. Results of thermodynamic optimization of the cycle for second law efficiency performed using genetic algorithm for different ambient temperatures are also presented. The cycle shows good potential for obtaining refrigeration and power generation.

scholarly journals Thermally Regenerable Redox Flow Battery for Exploiting Low-Temperature Heat Sources

2020 ◽  
Vol 1 (5) ◽  
pp. 100056 ◽  
Author(s):  
Irene Facchinetti ◽  
Riccardo Ruffo ◽  
Fabio La Mantia ◽  
Doriano Brogioli
Keyword(s):  
Low Temperature ◽  
Heat Sources ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Temperature Heat

scholarly journals Progress in design of adsorption refrigeration systems. Evaporators

2019 ◽  
Vol 213 ◽  
pp. 02035
Author(s):  
Wojciech Kalawa ◽  
Karolina Grabowska ◽  
Karol Sztekler ◽  
Jarosław Krzywański ◽  
Marcin Sosnowski ◽  
...  
Keyword(s):  
Heat Pumps ◽  
Adsorption Heat ◽  
Heat Sources ◽  
Adsorption Refrigeration ◽  
Correct Operation ◽  
Design Elements ◽  
Advantages And Disadvantages ◽  
Current State ◽  
Temperature Heat ◽  
Low Pressures

Adsorption heat pumps are becoming increasingly popular. Due to their design, they enable application of low-temperature heat sources. Evaporators for adsorption chillers make one of the basic design elements determining the correct operation of these devices. The specificity of operation in low pressures and temperatures is the reason why their design significantly differs from that of conventional evaporators. The pluralities of existing solutions as well as the lack of a systematic review of them cause difficulties in correct evaluation and choice of design. The paper presents the current state of art as well as a review of the existing solutions of evaporators used in adsorption heat pumps. The purpose of the review research is to present various solutions of evaporators as well as indicating their advantages and disadvantages in order facilitate the choice of the optimal design.

Innovative technologies for energy production from low temperature heat sources: critical literature review and thermodynamic analysis.

2021 ◽  
Author(s):  
Doriano Brogioli ◽  
Fabio LaMantia
Keyword(s):  
Low Temperature ◽  
Literature Review ◽  
Thermodynamic Analysis ◽  
Carbon Footprint ◽  
Energy Production ◽  
Scientific Community ◽  
Heat Sources ◽  
Innovative Methods ◽  
Temperature Heat ◽  
Critical Literature

The scientific community has taken on the challenge to develop innovative methods to exploit low-temperature (<100°C) heat sources, having a large potential to decrease the carbon footprint. In this review,...

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