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An expansion tank or expansion vessel is a small tank used to protect closed water heating systems and domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer [citation needed] and absorbs excess water pressure caused by thermal expansion. [1]
Hydronics (from Ancient Greek hydro- 'water') is the use of liquid water or gaseous water (steam) or a water solution (usually glycol with water) as a heat-transfer medium in heating and cooling systems. [1][2] The name differentiates such systems from oil and refrigerant systems. Historically, in large-scale commercial buildings such as high ...
Central heating. A central heating system provides warmth to a number of spaces within a building from one main source of heat. It is a component of heating, ventilation, and air conditioning (short: HVAC) systems, which can both cool and warm interior spaces. A central heating system has a furnace that converts fuel or electricity to heat.
[13] [14] If work is done on or by the fluid as it expands, then the total internal energy changes. This is what happens in a Joule–Thomson expansion and can produce larger heating or cooling than observed in a free expansion. In a Joule–Thomson expansion the enthalpy remains constant. The enthalpy, , is defined as
A thermal expansion valve is a key element to a heat pump; this is the cycle that makes air conditioning, or air cooling, possible. A basic refrigeration cycle consists of four major elements: a compressor, a condenser, a metering device and an evaporator. As a refrigerant passes through a circuit containing these four elements, air ...
While charging, the system can use off-peak electricity to work as a heat pump. One prototype used argon at ambient temperature and pressure from the top of the cold store is compressed adiabatically, to a pressure of, for example, 12 bar, heating it to around 500 °C (900 °F). The compressed gas is transferred to the top of the hot vessel ...
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