How to improve the operational efficiency of chillers

How to improve the operational efficiency of chillers

The chiller room is an important part of improving the air conditioning system. The following are 10 methods to reduce the operating cost of centrifugal water-cooled chillers. Most improvement measures only require small or no investment at all. The adoption of energy-saving measures mainly targets the following three aspects.

In terms of components: including proper operation and maintenance of the chiller unit. Adjust the appropriate water temperature and flow rate;

In terms of the system, suitable operating combinations should be made for multiple units under different load conditions;

In terms of renovation, it refers to the use of new energy-saving technologies to renovate existing units.

How to improve the operational efficiency of chillers

1. Set the outlet temperature of chilled water correctly.

For most of the year, the unit operates at partial load. During this period, due to the low ambient temperature and humidity, the overall demand for refrigeration capacity is not very high. Under partial load operating conditions, due to the reduced load of the dehumidification section, even if the water temperature of the end fan coil unit is slightly increased, the required indoor temperature can still be achieved. Generally speaking, increasing the outlet temperature of chilled water can lower the operating pressure of the compressor, thereby achieving energy-saving effects.

The above concepts have long been accepted by the air conditioning industry. A new study on fixed speed centrifugal units has found that the above theory is only valid when the operating load of the unit is within the range of 40% to 80%. In this range, every 1 ° F increase in the outlet temperature of chilled water can save energy by 0.5% to 0.75% (relative to the energy consumption during full load operation, the same below).

Surprisingly, when the operating load of a fixed speed centrifugal unit is below 40%, increasing the outlet temperature of chilled water will actually increase the energy consumption of the unit. On the other hand, for centrifugal units equipped with variable frequency devices, the energy-saving effect of increasing the outlet temperature of chilled water is very significant. Generally, under load conditions below 80%, increasing the outlet temperature of chilled water by 1 ° F can save 2% to 3% energy. Moreover, even if the operating load of the unit is as low as 10%, such energy-saving effects still exist.

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