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Refrigerant charge
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 humidity
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.
Retention time
Retention time describes the time, in which a volume of wastewater is stored within the pumping installation, pump sump, pipeline, detention basin etc.
Return temperature
Return temperature is a term describing the return water temperature in a heating system. This term is used for both sub-components and for a complete heating system.
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.
Rotating part of shaft seal
The rotating part of the seal is fixed on the pump shaft and rotates in the liquid during pump operation.
Rubber is used as a part of the shaft seals that prevent the pumped media from running out of the pump.
Rubber is used as a part of the shaft seals that prevent the pumped media from running out of the pump.
Safety valve
Relief valves are used to protect against the build up of excessive pressure in a closed system. The liquid in a closed system changes volume when the temperature of the liquid changes.
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.