12) The heat transfer by conduction through a thick sphere is same as through a thick cylinder.

13) In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively

14) As relative humidity decreases, the dew point temperature will be __________ wet bulb temperature.

15) The process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium, is called radiation.

16) The optimum effective temperature for human comfort is