5- An air conditioned room has a Sensible Heat gain of 3.4 KW. The room state is 24 °C, 50 % relative humidity. The heat gain from lighting is 15 Watts /m². The area of the room is 60 m². Calculate A) the supply air quantity in cubic meters per second if the supply air temperature is 15 °C. B) What must the supply air quantity be increased to if the lighting load is increased to 30 Watts /m² ? C) Draw the Room Ratio Line (or room process line) line on the psychometric chart assuming that the Room Latent Heat Gain is 0.23 KW. D) What is the enthalpy of the room air and its moisture content? E) What is the first air changes per hour rate if the height of the room is 3.2 m ?

The relative humidity is what? A) The amount of water vapor in the air divided by the maximum amount of water vapor the air can hold. B) The mass of water vapor in the air divided by the mass of air. C) The mass of water vapor in the air inside divided by the mass of water vapor in the air outside. D) The amount of water vapor in the air divided by the amount of pollution in the air. O A O C D

This device is responsible for passing outside air over the water to remove the heat from the system. a) capacitor b) evaporator c) cooling tower In this type of reciprocating compressors, the compressor shaft and the electric motor shaft are the same part. b) open c) semi-hermetic a) hermetic

In a gasoline engine the piston compresses the air-fuel mixture starting at a pressure of p1 = 1 bar and an ambient temperature of 27°C. The compression ratio is 9 and the combustion process is replaced by a heat treatment process of 1500 kJ/kg. calculate a) net work, b) thermal efficiency of the engine c) average effective pressure d) maximum attainable temperature. (standard air assumption)