Issue:
What approach temperatures should I expect to see on the evaporator and the condenser?
Resolution:
- The effectiveness of the heat exchanger is measured using the approach temperature
- This is calculated by subtracting the saturated refrigerant temperature from the leaving water temperature, whether it is for the evaporator or the condenser
- In the case of a chilled water loop without glycol, it is expected to observe an approach temperature of 1-2 degrees Fahrenheit for both the evaporator and the condenser
- A higher approach temperature indicates poorer heat transfer
- To prevent fouling, it is advisable to consult with a local water treatment specialist recommended by the manufacturer
- If the approach temperatures exceed 5 degrees Fahrenheit, it is recommended to schedule tube cleaning (punching) as a precautionary measure
- Waterflow could have an influence on approach temperatures. It is a good idea to verify flow is at design conditions
Facts:
- Water-Cooled Chiller (Pueblo) (RTHA)
- Water-Cooled Chiller (Pueblo) (RTHB)
- Water-Cooled Chiller (Pueblo) (RTHD)
- Water-Cooled Chiller (Pueblo) (RTWA)
- Water-Cooled Chiller (Pueblo) (RTWD)
Document Identifier: DOC-84842
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.