Regarding HVAC and Chiller systems, consider the following energy-saving measures:1.Increasing the chilled water supply temperature.2.Cleaning the condenser tubes regularly to maintain heat transfer efficiency.3.Using cooling tower water that is as warm as possible to reduce the compressor load.Which of the statements given above is/are correct?

Correct Answer: B - 1 and 2 only

Quick Concept Explanation

A modest increase in chilled-water supply temperature can improve efficiency if comfort/process requirements permit, while clean condenser tubes preserve heat transfer. Colder cooling-tower water generally reduces compressor lift; warm condenser water increases it. Key relation: Lower condensing temperature / higher evaporating temperature → lower compressor work.

Exam focus: Keep heat-exchanger surfaces clean and approach temperatures small. Common trap: Warm cooling-tower water does not reduce chiller compressor load.

Statement-wise Verification

• Statement 1 - Correct.
  Increasing the chilled water supply temperature.
  A modest increase in chilled-water supply temperature can improve efficiency if comfort/process requirements permit
• Statement 2 - Correct.
  Cleaning the condenser tubes regularly to maintain heat transfer efficiency.
  A modest increase in chilled-water supply temperature can improve efficiency if comfort/process requirements permit, while clean condenser tubes preserve heat transfer.
• Statement 3 - Incorrect.
  Using cooling tower water that is as warm as possible to reduce the compressor load.
  Lower condenser-water temperature generally lowers condensing pressure and compressor work, within chiller limits

Core Concept

Chiller efficiency improves when the refrigeration lift between evaporating and condensing conditions is reduced. A modest increase in chilled-water supply temperature can improve efficiency if comfort/process requirements permit, while clean condenser tubes preserve heat transfer. Colder cooling-tower water generally reduces compressor lift; warm condenser water increases it.

Formula / Key Relationship

Lower condensing temperature / higher evaporating temperature → lower compressor work.

Why the Other Options Are Wrong

Option A is incorrect because it omits correct statement(s) 2. Option C is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1. Option D is incorrect because it includes incorrect statement(s) 3.

Exam Shortcut / Approach

Keep heat-exchanger surfaces clean and approach temperatures small.

Common Mistake

Warm cooling-tower water does not reduce chiller compressor load.

Quick Revision

Chilled Water and Condenser Performance is linked with Chiller Efficiency, HVAC and Energy Management. Keep heat-exchanger surfaces clean and approach temperatures small.