CIRO Energy Efficiency & System Optimization

Question 1

What is the relationship between condensing temperature and system energy consumption?

Accepted Answer

Higher condensing temperatures increase compressor work and energy consumption; lowering condensing temperature by 1°F saves approximately 1-2% energy

Answer

Higher condensing temperatures save energy

Answer

Condensing temperature has no effect on energy use

Answer

Only evaporating temperature affects energy

Question 2

How does floating head pressure control save energy?

Accepted Answer

By allowing condensing pressure to decrease when ambient conditions permit, reducing compressor work

Answer

By keeping head pressure constant at all times

Answer

By increasing head pressure during cold weather

Answer

By bypassing the condenser entirely

Question 3

What is the benefit of variable frequency drives (VFDs) on compressor motors?

Accepted Answer

VFDs adjust motor speed to match actual load, avoiding the energy waste of running at full speed during partial load conditions

Answer

VFDs increase motor speed beyond rated capacity

Answer

VFDs eliminate the need for compressors

Answer

VFDs only affect lighting systems

Question 4

What impact does evaporator fouling have on system performance?

Accepted Answer

Fouled evaporators reduce heat transfer, lower suction pressure, increase compressor run time, and waste energy

Answer

Fouling has no effect on performance

Answer

Fouling actually improves heat transfer

Answer

Fouling only affects food quality, not energy

Question 5

How does proper insulation of refrigerated piping save energy?

Accepted Answer

Insulation prevents heat gain into cold pipes and moisture condensation, maintaining system efficiency and preventing ice buildup on pipes

Answer

Insulation is only for aesthetics

Answer

Insulation prevents pipes from freezing in winter only

Answer

Insulation has no energy benefit

Question 6

What is the optimal evaporator TD (temperature difference) for energy-efficient operation?

Accepted Answer

The smallest practical TD that maintains adequate capacity, typically 8-12°F for cold storage

Answer

The largest possible TD for maximum capacity

Answer

TD has no effect on efficiency

Answer

A TD of 30°F is optimal for all applications