Question

Renewable Energy question: (PLEASE provide me with TYPED solution)
********* PLEASE TYPE YOUR SOLUTION ************ I lost one question because I could not read the hand writing of the solution that somone provided, so please type yours. Thank you.

#. Solar heat harvesting makes use of what three modes of heat distribution? How does each work?

Answer 1

a standard solar air space and domestic water system,has three modes of operation

1)the first mode occurs when solar energy is available for collection and the space heating load is nonzero.

• During this mode,the fluid is circulated between the collectors and the load,while the storage unit is isolated.

2) the second mode occurs when solar energy is available for collection and the there space heating load is zero.

• During this mode, air is circulated between the collectors and the storage unit.

3) the third mode takes place when no solar energy is available for collection and there is a space heating load.

• During this mode, air is circulated between the storage unit and load .

The system operation is controlled by a series of thermostats,fans,and flow diverters.Airflow to the space heating load and auxiliary heat is governed by two stages thermostat which minitors room temperature.

• It commands the first stage (solar source)heating when the room temperature drops below a certain value.
• while the second stage (auxiliary source)heating is triggered when the room temperature futher drops below an even lower level.