Informatics Publishing Limited

Abhishek Khanchi ¹, Mani Kanwar Singh ¹, Satbir S. Sehgal ¹, Harkirat Sandhu ²

Affiliations
1 Department of Mechanical Engineering, Chandigarh University, Gharuan, Mohali – 140413, Punjab, IN
2 Department of Chemical Engineering, Chandigarh University, Gharuan, Mohali – 140413, Punjab, IN

Abstract

Low-grade waste heat recovery has emerged as a need for both efficient and sustainable approach. Till now conventional systems have failed to provide any assistance in harnessing and efficient conversion of low-grade to medium grade heat because of their huge sizes, high investment in land and equipment, complexity in design and scarcity in their availability. Researchers are now trying to solve these problems with the use of thermoelectric generators. These solid-state semiconductor devices can convert heat fluxes into DC output by maintaining a certain temperature gradient across its surfaces. Depending on the device and its rating power output increases with the rise in temp gradient. Objective: To identify errors with TEG module and if possible to perform investigation on it. Method/Statistical Analysis: In this method, two different positions were used. Firstly, one heat input surface was upside (hot side up) and second with heat input from below (Hot side down). This change in position will affect the convective motion of trapped air molecules and effect (if any) could be noticed. Findings: For hot side down position, there was an increment of 0.22% voltage output, 0.44% more power output and 0.521% increment in See beck coefficient observed in comparison with hot side up position.

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Gagan Sharma ¹, Mani Kanwar Singh ¹, Satbir S. Sehgal ¹, Harkirat Sandhu ¹

Affiliations
1 Mechanical Engineering, Chandigarh University, Mohali, Sahibzada Ajit Singh Nagar −140413, Punjab, IN

Abstract

Objective: We need to find method to improve PCM of thermal or physical properties by using nano particles as heat transfer rate enhancers. Methods/Statistical Analysis: In this study, we tested the thermal properties like, thermal conductivity, Density, Latent heat, Temperatures of paraffin composites. For this experimentation such as DSC, SEM and KD2 PRO were used. Nano particles used are Al₂O₃ and Cu O at different volume concentrations 0.1, 0.3 and 0.5 wt% to produce modified paraffin wax. Findings: Depends on our results, it may be fulfilled that the equipped PCMs can be regarded of use heat storage materials for some purpose in energy storage system. It can be resulted that by adding nano particles to improve melting points, pour points etc are improved in comparison with pure PCM. Heat capacity of nano composite is decreases with increase in nano particle concentration. Improvement/Applications: The nano particles can be used to get better physical properties of the nano composites and it’s applicable in construction materials, warm water, House heating, Catering, Temperature Peak Stabilization and Green House.

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