| 摘要 |
An air conditioning system having an open condenser water circuit, a refrigeration unit, a closed heat exchange water circuit, and shunt circuits interconnecting the two water circuits to bypass the refrigeration unit, is provided with various side stream filtering arrangements for removing contaminants from the common water supply which have been picked up in passing through the cooling tower. One embodiment employs a centrifugal separator connected in shunt with the condenser water pump. Another embodiment employs a mechanical filter in shunt with a bypass line in the heat exchange water circuit with valving for selectively placing the filter in series with the condenser or the cooling coils. The second embodiment can be used in combination with the first embodiment. Improved backwashing and water conservation is achieved with the second embodiment by feeding backwash water during backwashing of the second filter through a further filter back to a point upstream of the condenser water pump but downstream of the cooling tower. Chemical treatment of the water is replaced by an electrodynamic-ultrasonic treatment device in side stream relation to a section of the open condenser water circuit. When required a closed loop filtration system is connected directly to the cooling tower drawing water from its sump and returning it directly after filtering. A water level sensor in the cooling tower controls a throttling valve downstream of the main pump to prevent the water from dropping below a safe level due to excessive load.
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