ACR-104 Unit 22

The refrigerant in a condenser in a refrigeration system ____.

• rejects heat
• absorbs heat
• changes to a vapor
• is under lower pressure than the evaporator

The condenser in a refrigeration system ____.

• All of the above.
• desuperheats the vapor from the compressor
• condenses the vapor from the compressor
• subcools the liquid refrigerant before it leaves the condenser

A normally operating water-cooled condenser is operating with a 10°F differential between water in and water out. If scale forms on the water tubes and the entering water is 85°F, which of the following is possible?

• Both are correct
• None are correct
• The outlet water temperature will be lower than expected.
• The system head pressure will rise.

Mineral deposits on the water side of a water-cooled condenser act as a(n) ____.

• insulator
• conductor of heat
• cleaning solution
• They have no effect on the operation of the condenser.

In a water-cooled condenser with dirty condenser tubes, the temperature difference between the refrigerant and the leaving water will be ____ when the tubes are clean.

• greater than
• less than
• the same as
• slightly lower than

The water circuit in shell-and-coil and tube-within-a-tube coil condensers must be cleaned ____.

• chemically
• by removing the end caps
• with a brush
• by air pressure

The shell-and-tube condenser is cleaned ____.

• with a brush after removing the end caps
• only with chemicals
• with compressed air
• with a vacuum cleaner

In a water-cooled condenser, a regulating valve is used to control the ____.

• refrigerant head pressure
• refrigerant flow through the pressure reducing device
• suction pressure
• water temperature

What can be used to maintain the head pressure of a system with a water-cooled condenser?

• Water regulating valve.
• Fan cycling.
• Dampers or louvers.
• All of the above.

The typical design temperature for the water entering a recirculating water system condenser is 85°F, and most systems have a ____ rise across the condenser.

• 10°F
• 1°F
• 5°F
• 15°F