¶The Need for Environment Control
With wide spread use of micro-electronics in today’s control systems, temperature management takes on a new priority in order to ensure steady and reliable performance. The maintenance of a correct operating temperature may combine both cooling and or heating inside an enclosure which can protect against costly down time and system failures.
¶General Selection Considerations
|Maximum desired enclosure
temperature is 10°F or 5°C
above maximum outside ambient.
|Oversize the Enclosure||Easy to implement, no maintenance. Maintains NEMA rating of the enclosure.||Dissipates small amount of heat.
Larger enclosure size takes up more space.
|Install ventilation louvers||Economical solution, very little
maintenance, easy to implement.
|Dissipates limited amount of heat. Dirt, oil or fluids could enter the enclosure. NEMA rating is affected.|
|Install filter fans||Less expensive than air/refrigeration systems. Relatively high amount of heat removed, some termperature control by using thermostats.||Must maintain filters. NEMA rating can be affected. Limited use in hostile environments such as chemical applications.|
|Use an air/air heat exchanger||Easy to install, small power consumption, temperature control via thermostat. Maintains NEMA rating of the enclosure.||Must maintain filters.|
|Maximum desired enclosure temperature lower than maximum outside ambient.||Use an air conditioner||Easy to install. Temperature control via factory installed thermostat. Removes large amounts of heat. Maintains NEMA rating of enclosure, dehumidifies enclosure air.||Must maintain filter. Generally not to be used when outside temperature is below 59°F (15°) or above 130°F (52°C).|
|Localized heat or "hot spots".||Install circulation fans in the enclosure.||Economical solution, no maintainance, easy to install. Maintains NEMA rating of the enclosure.||Dissipates small amount of heat.|
|Outside temperature is below minimum allowable equipment operation range.||Heat with radiant heater.||Economical power consumption. Reliable, can be temperature controlled.||Consumes energy, takes up internal panel space.|
|Condensation occurs.||Heat with radiant heater to maintain temperature above the dewpoint.||Economical power consumption. Reliable, humidity can be controlled.||Consumes energy, takes up internal panel space.|