A window-mounted air conditioner supplies 19 m3/min of air at 22℃, 1 bar to a room. Air returns from the room to the evaporator of the unit at 29℃. The air conditioner operates at steady state on a vapor-compression refrigeration cycle with R134a entering the compressor at 7 bar, 28℃. Saturated liquid refrigerant at 12 bar leaves the condenser. The compressor has an isentropic efficiency of 75%, and refrigerant exits the compressor at 12 bar. Determine the compressor power, in kW, the refrigeration capacity, in tons, and the coefficient of performance.

If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.

What precautions should you take to prevent injuries when dealing with heavy loads?

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?