Explanation: Condenser is used to convert vapor refrigerant discharging from the compressor into liquid refrigerant by rejecting heat. So, it is used on the high-pressure side to do the conversion. At discharge pressure after compression, condensation is carried out.

Explanation: Heat transfer of condenser depends upon the temperature difference between the condensing medium and vapor refrigerant and affects the heat transfer rate. So, air-cooled condensers are designed for the temperatures difference of 14⁰C for the optimum heat transfer rate and smooth and hassle-free operation.

Explanation: Natural convection phenomenon is used to carry out the operation. Large surface area is required for the proper heat transfer between the mediums. Due to the slow process and able to handle low capacity used just in small-capacity applications like domestic refrigerators.

Explanation: Shell and coil condensers consists of one or more water coils enclosed in the welded steel shell through which refrigerant flows. So, the refrigerant flows in the shell, and water in the coil is the perfect construction of this type of condenser.

Explanation: As ammonia is toxic and has the ability to rust the material which comes in the contact. So, in the ammonia refrigeration system, steel tubes are used for shell and tube condensers to avoid the corrosion.

Explanation: Evaporative condenser uses air and water as a condensing medium. This type of condenser does the combined work of water-cooled condenser and cooling water, and hot vapor is condensed into a liquid refrigerant.

HRF = 1 + 1 / 4.28 = 1.233.

HRF = 1 + (10 / 40) = 1 + 0.25 = 1.25.

Explanation: The main advantage of air-cooled condensers is that they operate at higher condensing temperatures than water-cooled condensers. Due to this high temperature, the compressor has to do more work and might affect C.O.P. in some conditions.

Explanation: HRF depends on C.O.P. as HRF = QC / RE = RE + W / RE = 1 + W / RE = 1 + 1 / C.O.P. and as C.O.P. is affected by condenser and evaporator temperature. So, for the given conditions, the value of the Heat Rejection Factor for R – 12 at condensing temperature and evaporator temperature as 40°C and 5°C respectively is 1.25.