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Experimental and theoretical analysis of single-phase convective heat transfer in channel with resistive heater and thermoelectric modules for hydronic cooling and heating device

by Gupta, Abhishek

Abstract (Summary)
Experiments were performed on a heat exchanger equipped with multiple thermoelectric (TE) modules. The primary objective was to design a simple, but effective, modular Peltier heat pump system component to provide chilled or hot water for domestic use. Moreover, the modular design of this system component is such that the total system capacity is scalable such that it can potentially be used for hydronic building climate control of small solar residences, where the TE devices could be directly energized using solar powered PV panels, and coupled with the building inlet water supply heat sink and grey water heat recovery, providing a renewable, pollution free and cost-effective solutions to the home energy problem.   First, the work focuses on the design and testing of a thermoelectric heat exchanger component that consists of two water channels machined from two aluminum plates with an array of three or five thermoelectric modules placed in between to cool and/or heat the water. Then the present work focuses on the detailed convection analysis of the system. For calculating the local heat transfer coefficient at different points along the channel, the tests were carried, first, with a continuous heater and then with discrete TE modules in steady state mode. Due to lack of much data in transition regime, the experimental heat transfer coefficient values obtained by heater testing are mainly compared with the theoretical predictions based on already established analogies for forced convection turbulent flow inside the channel like Colburn, Gnielinski and Churchill. The experimental results with TE units were presented [Kazmierczak et. al. 2008]. The heat transfer coefficient for experimental results with TEs are calculated and compared with that obtained by earlier performed convection analysis of the system based on Churchill's transition correlation and the discrete heat source correlations for turbulent flow. Due to transition nature of the flow, the presented experimental data agrees with the available literature within certain limits.
Bibliographical Information:

Advisor:

School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:peltier cooling developing turbulent flow internal forced convection discrete heat flux

ISBN:

Date of Publication:01/01/2008

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