scholarly journals Efficient storage and recovery of waste heat by phase change material embedded within additively manufactured grid heat exchangers

2021 ◽  
Vol 181 ◽  
pp. 121846
Author(s):  
Maryam Roza Yazdani ◽  
Alpo Laitinen ◽  
Valtteri Helaakoski ◽  
Lorant Katona Farnas ◽  
Kirsi Kukko ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Exchangers ◽  
Waste Heat ◽  
Efficient Storage ◽  
Change Material

Phase Change Material as Pump in an Organic Rankine Cycle

2014 ◽  
Vol 575 ◽  
pp. 662-667
Author(s):  
Barghav Subramony Hariharan ◽  
Kaushik Suresh
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Electrical Energy ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Change Material

Organic Rankine Cycles (ORC) is predominantly used in waste heat recovery applications because of their low temperature working range. The main efficiency enhancement operation in an Organic Rankine Cycle is reducing the pump work .The pump converts electrical energy to flow energy. This input reduced and output maintained at the same level gives us a more efficient waste heat recovery system. The pump work can also be achieved by using a material that has the ability to expand on heating and revert back to its original state on cooling. The expansion property of the material is used to compress and drive the operating fluid through the cycle. Material that was observed to possess such properties was Phase Change Material. Conventionally PCM were used as thermal storage to preheat the working fluid in an ORC but a novel idea is to make the PCM utilize the heat rejected from the condenser and do the pump work. This paper discusses the various desirable properties of PCM to perform pump work efficiently and also the general layout and working of ORC system using PCM. The working fluid selected is toluene

Heat Energy Storage Characteristics of a New Type of PCM Heat Exchange Tube

2012 ◽  
Vol 550-553 ◽  
pp. 3131-3134
Author(s):  
Xiao Qin Zhu ◽  
Zhao Sheng Cao ◽  
Zi Yue Zhu ◽  
Jing Hua Chang ◽  
Hai Ming Gu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Heat Exchange ◽  
Phase Change ◽  
Phase Change Material ◽  
Waste Heat ◽  
Heat Energy ◽  
Heat Exchange Tube ◽  
New Type ◽  
Change Material ◽  
Storage Characteristics

Heat energy storage characteristics of a new type of PCM heat exchange tube was researched, in which it took the traditional double-tube exchanger as the total construction foundation and phase change material(CaCl2•6H2O) was filled in the annular area between the inner tube and the outer tube. As air with different temperatures flowed through the PCM heat exchange tube, temperature measurements were carried out at the inlet and the outlet by the experimental system. The experimental results showed that, a new type of PCM heat exchange tube could store heat energy from the hot air by the phase change material in the annular area, and discharge the stored heat energy into the required fluid if necessary. Thus it has two functions of heat exchange and heat energy storage, and is mainly suitable for recovery and utilizations of heat energy in greenhouses, buildings, air conditioning and manifold industrial afterheat or waste heat.

scholarly journals Passive generation from a novel thermoelectric energy harvesting system model integrated with phase change material

2019 ◽  
Vol 111 ◽  
pp. 03060
Author(s):  
Yoo-Suk Byon ◽  
Hansol Lim ◽  
Yong-Kwon Kang ◽  
Soo-Yeol Yoon ◽  
Jae-Weon Jeong
Keyword(s):  
Phase Change ◽  
Temperature Profile ◽  
Phase Change Material ◽  
Temperature Difference ◽  
Wall Temperature ◽  
Waste Heat ◽  
Thermoelectric Energy ◽  
Temperature Method ◽  
Thermoelectric Energy Harvesting ◽  
Change Material

The purpose of this research is to evaluate the performance of a novel model that incorporates a thermoelectric generator (TEG) and phase change material (PCM). The proposed model passively generates electricity using waste heat that accumulates at exterior wall surfaces. The main generator is a TEG. To maintain the temperature difference between the two sides of the TEG, PCM is located at its cold side—thus converging the heat transferred into latent heat. The proposed passive generation system is formed into a TEG-PCM block. The block can be stacked to form a wall or inserted into any part of a building that faces the sun. The experiment setup is based on a constant temperature method. The wall temperature profile is set according to solar radiation, convection, and radiative heat transfer. To replicate daily wall temperatures during the experiment, a heat plate is used to match a wall temperature profile. Step control was used for the heating plate. The resulting data shows the average temperature difference between the hot and cold sides of the TEG to be 10-20°C. The peak generated electricity was 0.08 W for a single module.

Phase-Change Material to Thermally Regulate Photovoltaic Panels to Improve Solar to Electric Efficiency

2015 ◽  
Author(s):  
Andrew H. Rosenthal ◽  
Bruna P. Gonçalves ◽  
J. A. Beckwith ◽  
Rohit Gulati ◽  
Marc D. Compere ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Temperature Regulation ◽  
Heat Dissipation ◽  
Waste Heat ◽  
Electrical Power ◽  
Solar Irradiation ◽  
Thermal Systems ◽  
Pv Panel ◽  
Change Material

This paper investigates the use of phase-change material (PCM) for temperature regulation of a rack-mounted photovoltaic (PV) solar panel. PV panels exhibit a significant decrease in electrical efficiency as temperature trends higher. Current PV panels are approximately 10–16% efficient at harnessing incident solar irradiation into effective electrical power. The remaining solar irradiation that is not converted to electricity will heat the PV panel and decrease efficiency. Using PCM for temperature regulation and temporary heat storage in photovoltaic/thermal systems (PVT) is an emerging technology that has attracted attention recently. The PCM absorbs heat and regulates peak temperature, which allows the PV panel to operate at lower temperatures during peak solar conditions. Further, the waste heat stored in the PCM can be used for other applications. The main focus of this paper is to experimentally evaluate the heat dissipation of four different PCM containment configurations from a simulated PV panel.

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