Considerations, design calculations, construction, test and evaluation of a cavity walled solar oven Part 2: Evaluation of insulation materials
This report is Part 2 of- (and an addendum to-) the Part 1 of: “Considerations, design calculations, construction, test and evaluation of a cavity walled solar oven”. Both Part 1 and Part 2 of the report are based on a cavity walled solar oven consisting of two boxes – one within the other – with a double paned lit.
Series: Practical Answers
Published: 2025
Pages: 42
eBook: 9781835768907
| 1. Abstract. | |||
|---|---|---|---|
| 2. Retrieval of the test results found for plain air in Part 1 of the report. | |||
| 2.1 Errata. | |||
| 3. How to find the equation for an entire exponential graph based on just three points / measurements. | |||
| 4. Estimating the ratio between radiation, convection and conduction, using the heating graph. | |||
| 5. How to time the measurements to extract three (or more) tests from each heating graph. | |||
| 6. The test setup. | |||
| 7. Measuring the thermal resistance of the insulation materials. | |||
| 7.0 Plain air. | |||
| 7.1 Thick fabrics in form of two towels. | |||
| 7.2. Cardboard 2.5 mm. | |||
| 7.3. Paper balls. | |||
| 7.4. Hey. | |||
| 7.5. Wool – untreated - straight from sheep. | |||
| 7.6. Thin fabrics - in form of a shirt and a skirt – suspended on cardboard. | |||
| 7.7. Polystyrene. | |||
| 7.8. Popcorn. | |||
| 7.9. Measurement with the oven wrapped in fibre duvet – with no solid insulation filling. | |||
| 7.10. Measuring the heat leakage through the pane. | |||
| 8. Comparing the tested insulation materials to plain air. | |||
| 9. Analysing of the measurements. | |||
| 10. Second thoughts concerning the construction of the solar oven. | |||
| 10.1. A calculated example of the impact of a lower thermal capacitance on the cooking time. | |||
| 10.2. A calculated example of the impact of polystyrene on the cooking time. | |||
| 10.3. Pivoting the oven when aligning it to the sun. | |||
| 11. The conclusions. |
Steen Carlsen
Steen Carlsen is an electronics engineer, and founder of Carlsen Power Electronics.
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