If the moisture content in the air remains constant, the dew point temperature is fixed, but relative humidity changes with temperature variations.
Regarding the use of circuit breakers, which of the following descriptions are correct?
A frame circuit breaker can be used for low-voltage main distribution cabinets where the incoming current is very large
A plastic shell circuit breaker should be used for a precision air conditioner with a cooling capacity of 42kW; a miniature circuit breaker cannot be used.
A miniature circuit breaker can be used in precision distribution cabinets.
A plastic shell circuit breaker can be used for a 200kVA UPS distribution cabinet.
If a cooling system uses a DX scheme, it can plan the deployment sequence of the air handling units and outdoor units accordingly.
In a data center where precision cooling units are supplied by single-phase power, using dual power supplies and ATS for switching can meet Tier III requirements if both units share a single ATS.
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