Refrigerant charge is a term used for the type and mass of refrigerant a refrigeration plant will hold to perform under the given conditions. The type of refrigerant must be applicable for the application and the ambient conditions. For example, the ASHRAE standards are general recommendations regarding local ambient conditions for inside and outside temperatures in both summer and winter in any country.
Relative air humidity is a term used to describe the amount of water vapour in the air. Relative air humidity is the ratio of the water vapour’s partial pressure to the saturated vapour pressure at a given temperature. Relative air humidity is expressed as a percentage.
Roof tank systems
Roof tanks are fresh water tanks, placed atop high-rise buildings. Roof tank installations are used in water supply applications mainly due to unstable water mains and unstable power supply.
The saturation point is the point at which air is unable to absorb more water. Saturation point can also be referred to as dew point. It can also be stated that a saturated liquid, such as water or a saturated vapour, contains the maximum amount of heat energy without boiling or condensing.