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.

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.

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.