RSES Condenser Systems 5

Question 1

A technician measures 15°F of subcooling at a water-cooled condenser operating at design conditions. This indicates:

Accepted Answer

Normal operation with adequate liquid seal at the metering device

Answer

15°F of subcooling is within the normal range and confirms the metering device receives a full column of liquid refrigerant without flash gas.

Question 2

What causes 'refrigerant migration' to the condenser during an off cycle?

Accepted Answer

Low ambient temperature making the condenser the coldest part of the system

Answer

During the off cycle in cold weather, the condenser becomes the coldest point and refrigerant vapor migrates to it, condensing and accumulating there.

Question 3

An air-cooled condenser with recirculated hot discharge air will show which symptom?

Accepted Answer

Abnormally high condensing pressure despite normal ambient temperature

Answer

Recirculated hot air raises the effective entering air temperature at the condenser, elevating condensing pressure above what the true ambient would cause.

Question 4

In a parallel condenser configuration with multiple refrigerant circuits, what is the main balancing concern?

Accepted Answer

Ensuring equal refrigerant distribution to prevent liquid pooling in one circuit

Answer

Unequal distribution causes liquid to pool in one circuit while another starves, reducing overall heat rejection and causing operational problems.

Question 5

Which ASHRAE standard provides guidelines for cooling tower and evaporative condenser water treatment to prevent Legionella?

Accepted Answer

ASHRAE 188

Answer

ASHRAE Standard 188 establishes minimum risk management requirements for water management programs in building water systems, including cooling towers and evaporative condensers.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES Condenser Systems 5