Voltas Senior Engineer Interview Questions and Answers

A refrigerator removes heat from its interior to keep food and beverages cold, using a refrigeration cycle.

• Uses a refrigeration cycle involving evaporation and condensation.

• Heat is absorbed from the interior and expelled outside.

• Commonly used to preserve food, medicines, and other perishable items.

• Example: A refrigerator maintains a temperature of 35-38°F to keep milk fresh.

A chiller is a device that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle.

• Chillers are commonly used in HVAC systems to cool buildings.

• They can be found in industrial applications, such as cooling machinery.

• Chillers help maintain optimal temperatures in data centers to protect equipment.

• In food processing, chillers are used to keep products at safe temperatures.

The refrigeration cycle is a thermodynamic process that removes heat from a designated area to lower its temperature.

• 1. Evaporation: Refrigerant absorbs heat from the environment, turning from liquid to gas.

• 2. Compression: The gas is compressed, increasing its pressure and temperature.

• 3. Condensation: The hot gas releases heat to the surroundings, condensing back into a liquid.

• 4. Expansion: The liquid refrigerant expan...read more

Chillers and VRF systems differ in design, application, and efficiency, with various compressor types influencing performance.

• Chillers are centralized cooling systems, while VRF systems are decentralized and allow for individual zone control.

• Chillers typically use water or refrigerant to cool large buildings, e.g., centrifugal chillers for commercial use.

• VRF systems use refrigerant as the cooling medium and can simulta...read more

COP measures efficiency in heating/cooling systems; heat load calculations determine required capacity for HVAC systems.

• COP (Coefficient of Performance) is the ratio of useful heating or cooling provided to the energy consumed.

• Heat load calculations assess the thermal energy needed to maintain desired indoor temperatures.

• Types of PCBs (Printed Circuit Boards) in VRF (Variable Refrigerant Flow) systems include control P...read more