Which of the following is usually not used as the heat exchange fluid in a flat-plate solar collector?
A.Air
B.Fuel oil
C.Water
D.Ethylene glycol and water
A.Air
B.Fuel oil
C.Water
D.Ethylene glycol and water
A.freezing point
B.pour point
C.boiling point
D.none of the above
A.60 to 80 rpm
B.100 to 120 rpm
C.180 to 200 rpm
D.300 to 400 rpm
A.All longitudes and latitudes are great circles
B.All longitudes and equator are great circle
C.All longitudes and Greenwich meridian area great circle
D.None of these
A.pressure
B.temperature
C.volume
D.entropy
A.solar noon
B.sunset
C.sun rise
D.none of the above
A.convection
B.radiation
C.conduction
D.convection and radiation
A.21-Nov
B.21-Jan
C.22-Dec
D.31-Dec
A.Ibn sin ?
B.Ibn cos ?
C.Ibn sec ?
D.Ibn