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Secondary refrigerant
Coolant can be divided into primary coolant and secondary coolant. A secondary coolant is generally non-toxic in small amounts, though larger amounts must be disposed of appropriately.
A process in which solid particles with a density greater than water settle out of the water phase due to gravity.
Selective corrosion
Selective corrosion is a type of corrosion which attacks one single element of an alloy and dissolves the element in the alloy structure.
Sensible cooling load
Sensible cooling load is a measurement of the amount of energy that must be removed from, for example, the air inside a building, in order to maintain a certain temperature, regardless of the temperature outside. Cooling load must be taken into account, when calculating the capacity of a cooling system.
Sensible heat ratio
Sensible heat ratio (SHR) is the term used to describe the ratio of sensible heat load to total heat load.
Sewer system
A sewer system comprises a network of pipelines that collect and transport waste- and stormwater to a wastewater treatment plant or the receiving waters.
Shaft seal
In its most basic form, a shaft seal combines a rotating part with a stationary part.
Shaft seal forces
The parts of the seal inside the pump are subjected to an axial force from the pressure in the pumped liquid.
Shell and tube exchanger
Shell and tube heat exchangers exchange thermal energy from one fluid to another. Because it is characterised by low pressure loss, it is well-suited to air conditioning systems.
SI units
The International System of Units (SI) is the world's most widely used system of measurement, both in everyday commerce and in science