SPX Cooling Technologies MHF702, MHF705 user manual Fluid Cooler Operation, General

Operation

Fluid Cooler Operation

General:

The cold process fluid temperature obtained from an operating fluid cooler will vary with the following influences:

1.Heat load: With the fan in full operation, if the heat load increases, the cold process fluid temperature will rise. If the heat load reduces, the cold process fluid temperature will reduce.

Heat Load (kilowatts)

Range – °C =

Liters/sec x 4.187

Note that the number of degrees (“range”) through which the fluid cooler cools the process fluid is established by the system heat load and the amount of fluid being circulated, in accordance with the follow- ing formula—formula is only valid for 100% water as process fluid:

The fluid cooler establishes only the cold process fluid temperature attainable under any operating circumstance.

2.Air wet-bulb temperature: Cold process fluid temperature will also vary with the wet-bulb temperature of the air entering the louvered faces of the fluid cooler. Reduced wet-bulb temperatures will result in colder process fluid temperatures. However, the cold process fluid temperature will not vary to the same extent as the wet-bulb. For ex- ample, a 11°C reduction in wet-bulb may result in only a 8°C reduction in cold process fluid temperature.

3.Fluid flow rate: Increasing the process fluid flow rate (L/s) will cause a slight elevation in cold process fluid temperature, while reducing the fluid flow rate will cause the cold process fluid temperature to decrease slightly. However, at a given heat load (see formula above), process fluid flow reductions also cause an increase in the incoming hot process fluid temperature and thermal range.

Under no circumstances should the recirculation water pump(s) be

Notecycled to control process fluid temperature. It is recommenced that while process fluid is being circulated through the coil the fluid cooler recirculation water system always be in operation.

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