Question

Question From Solar Technologies....

#1)  From system engineering standpoint, describe ways as to how the hot air from a solar collector can be used in buildings.

#2) Use the data provided in example 3.15 (pp. 118-119) to compute the available power, outlet temperature, and thermal efficiency at vwind = 2 m/s (all other boundary conditions are the same as condition No. 4). Compare the results from this new condition with that from condition No. 4. Note: Please describe the procedure and equations used for the calculations, and show you work (or attach your spreadsheet).

____(giwevn question)Example 3.15 Calculation of the available power, the outlet temperatures and the thermal efficiency for a facadeintegrated air collector at 800 W/m² irradiance and an ambient temperature of 10°C. The ambient temperature equals the inlet temperature Tf,in in the collector. The air duct geometry corresponds to the examples already calculated with a collector length of 2.5 m, and the heat transfer coefficient of the rear Ub is a constant 0.65 W/m²K (side losses ignored).

Answer 1

Ans.1

We can use the hot air from the solar collector in place of Heat Pump or Room Heater, at the cold places, where heat is required within the building. This can be a good economical step, as the running cost of the equipment is very low.

As the density of the hot air will be lower, so we have to use fan or blower to transfer the air to the building from the solar collector. To control the flow of the air, the control system should be there. Also to regulate the temperature of the air flow, the mixing of hot air with the normal air should be done, so such configuration is needed.

This hot air can also be used in chilled places, to remove the fog or ice from the building windows.

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