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Monday, December 24, 2018

Solar Refrigeration using the Peltier Effect (Free PDF)

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In order to design a coolerbox, utilising Thermo-electric technology as a heat pump, it was necessary to determine if this type of technology would be suitable for a coolerbox heat pump application. A detailed TEC (Thermo Electric Cooler) sizing estimation was done, using formulas supplied by the manufacturer, and using thermo-electric themy formulas to calculate the absolute theoretical performance parameters for a suitable TEe The correct heat pumping capability is important is possible to obtain TEes with different input currents, voltages and heat pumping capabilities.

Using the TEC as a heat pump, it was decided to use water cooling due to the extremely high cost of a suitable air cooled heatsink. It should be noted that to cool the hot side of theTEe a vel}' efficient heat exchanger should be used.

A simulator was constructed to simulate, under variable operating temperatures and input powers, the cooling capacity of the TEC heat exchanger. The cooling characteristics were then used to determine if the theol}' and manufacturers claims correspond with the cooling characteristics of the coolerbox. It might be possible that the performance of the TEC would be drastically influenced, since installation con~itions may not be ideal when installed; and, that the manufacturers performance claims are done when the TEC is operated under ideal conditions. This would ensure optimum results because, should an under sized TEC be used, the result would be poor cooling characteristics; or, if the TEC is over sized, the coolerbox would consume too much power, resulting in an inefficient system.

Table of Contents
1. Thesis Contents and Structure
1.1 Introduction
1:2 Fonnulating the Problem
1.3 Placing the Problem in Context
1.4 Aims and Objectives
1.5 Preliminary Investigation
1.6 Research Method
1,7 History ofThenno Electric Cooling
2 Theoretical Background and Design Parameters
21 Introduction
22 Materials used in a TEC
23 Types of HeatConduction
24 Thermo-electric Cooler Heat Exchanger Installation Design
25 Theoretical Analysis
26 TEC Performance Handicap
27 Newtons Cooling Law
28 Total Heat Pumping Demand
29 Theoretical Elinlination ofTEC Size
210 Conclusion
3. Construction ofTest Apparatus and Tests
3.1 Introduction
3.2 Method of Testing
3.3 Measured Results
3.4 Performance Results
3.5 Discussion of Results
3.6 Conclusion
4. Coolerbox Design and Testing
4.1 Introduction
4.2 Design Parameters
4.3 Basic Construction
4.4 Heat Pumping Requirement and Sizing of the Heat Exchanger
4.5 Coldsink Design
4.6 Hot Side Heat Exchanger
4.7 Performance Test of Prototype Coolerbox
.4.8 Cost Analysis
4.9 Conclusion
5. Final Conclusion and Future Research
5.1 Introduction
5.2 Summary of Conclusions
5.3 Future Research
List of References
Bibliography A :
Annexure A
Annexure B
Annexure C
Annexure D
Annexure E
Annexure F

Author Details
"I.C. Swart"

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