As energy costs continue to increase, conservation strategies have become crucial. There are a number of steps you can take that not only will improve the operation of your chiller system but also will increase overall system energy efficiency. Some of these steps include:
1 Replace old chillers or compressors with new, higher-efficiency models.
2 Use energy-efficient motors for continuous or near-continuous operation.
3 Avoid oversizing a chiller system; instead, match the system to the connected load.
4 Increase the chilled water setpoint if possible.
5 Use the lowest temperature condenser water that the chiller can handle. (Reducing the water temperature can decrease compressor power consumption.)
6 Increase the evaporator temperature. (This action also can decrease compressor power consumption.)
7 Optimize condenser and chilled water flow rates.
8 Clean condenser coils and heat exchangers when fouled. (Energy consumption will increase when they are dirty.)
9 Do not overcharge the system with refrigerant or compressor oil.
10 Isolate off-line chiller and cooling tower equipment.
11 Use “free cooling” methods to allow the chiller system to shut down in cold weather conditions.
12 Establish a chiller efficiency maintenance program, starting with an energy audit and follow-up, and then make this efficiency program part of your continuous energy management program.
13 Study chiller loading characteristics and cycling costs to determine the most efficient mode for operating your chiller system, and change your operating practices accordingly.
13 Tips for Efficient Chiller Operation
September 1, 2008