EPA Section 608 Universal Certification ExamType III (Low-Pressure Appliances)Medium
What is the primary function of a water box in a low-pressure chiller system?
- ATo direct the flow of cooling water through the condenser and evaporator.
- BTo collect condensate from the evaporator coils.
- CTo store excess refrigerant during periods of low load.
- DTo house the purge unit for non-condensable removal.
Show answer & explanationAnswer & explanation
Correct answer: A. To direct the flow of cooling water through the condenser and evaporator.
The water box in a low-pressure chiller is a chamber that directs the flow of water (either chilled water in the evaporator or condenser water in the condenser) through the heat exchanger tubes, ensuring efficient heat transfer.
Why the other options are wrong
- B. Condensate is collected by a drain pan, not the water box.
- C. Excess refrigerant is typically stored in a receiver or removed from the system, not stored in the water box.
- D. The purge unit is a separate component, not housed within the water box, although it connects to the system.
Low-Pressure Chiller Water Box
The water box in a low-pressure chiller is an integral part of the heat exchangers (evaporator and condenser) that directs the flow of water through the tubes for effective heat transfer.
- Part of evaporator and condenser.
- Ensures uniform water flow.
- Key for heat exchange efficiency.
Memory trick: Water box: water flows, heat goes!