Question

The power consumption of Vapour Compression Refrigeration System (VCRS) with air cooled condenser compared to VCRS with water cooled system will be higher due to
1. High discharge temperature
2. High condensing temperature
3. Low suction temperature
4. High refrigeration load

Answer 1

Correct Answer - Option 1 : High discharge temperature

Explanation:

Type of condenser:

There are three types of condenser

Air-cooled:

• Air-cooled condensers use air as the cooling medium.

Water-cooled:

• Water-cooled condenser uses water as the medium.

Evaporative condenser:

• It is a combination of both i.e. use both air and water.

Condensing Temperature:

This is the temperature at which the refrigerant gas turns into its liquid state in the condenser. The air-cooled condenser is cooled by the ambient air. The ambient air temperature will be higher than the temperature of the water. The temperature of natural water is dependent on the ambient wet-bulb temperature which always is lower than the ambient dry bulb temperature. Hence the condensing temperature will be higher in air-cooled condenser than in a water-cooled condenser.

Discharge Temperature:

The discharge of the compressor is the hottest part of the system. Higher the discharge temperature higher the work input required, the discharge temperature in the air-cooled system is higher as compared to the water-cooled system, therefore, power input to the VCRS is more in the air-cooled system as compared to water-cooled system.