User:Vikram Kaadam: Difference between revisions
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1. Flat plate collector model [https://github.com/rrh/ascend_renewable_energy/blob/master/flat_plate_collector.a4l | '''1. Flat plate collector model''' [https://github.com/rrh/ascend_renewable_energy/blob/master/flat_plate_collector.a4l Link to code] | ||
Here, I am trying to model commonly used 'fin and tube' type of absorber,a flat plate collector, for liquid heating. I have considered 1 glass cover. Model aims at calculating overall heat loss coefficient (Ul) and useful energy gain (Qu). | Here, I am trying to model commonly used 'fin and tube' type of absorber,a flat plate collector, for liquid heating. I have considered 1 glass cover. Model aims at calculating overall heat loss coefficient (Ul) and useful energy gain (Qu). | ||
Mean plate temperature and ambient temperature are given. | Mean plate temperature and ambient temperature are given. | ||
Revision as of 02:48, 8 April 2011
1. Flat plate collector model Link to code
Here, I am trying to model commonly used 'fin and tube' type of absorber,a flat plate collector, for liquid heating. I have considered 1 glass cover. Model aims at calculating overall heat loss coefficient (Ul) and useful energy gain (Qu). Mean plate temperature and ambient temperature are given.
Thus model is valid for the range of 'effective transmittance-absorptance product' which satisfy below mentioned assumptions. Also model does not calculate the solar gain S {= (effective transmittance-absorptance product) * ( solar radiation falling on tilted collector surface)} but take it as direct entry.
Assumptions: 1. Performance is steady state. 2. Construction is of parallel sheet and tube type. 3. The headers cover small area and can be neglected. 4. There is no absorption of solar energy by covers insofar as it affects losses. 5. The headers provide uniform flow to the collector tubes. 6. There is one dimensional heat flow from the covers. 7. There is one dimensional heat flow from the black insulation. 8. The covers are opaque to infrared radiation. 9. There is negligible temperature drop through covers 10. The sky can be considered a black body for long wavelength radiation at equivalent sky temperature.