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2. Condensing boiler - Wikipedia

   en.wikipedia.org/wiki/Condensing_boiler

   Since the final exhaust from a condensing boiler has a lower temperature than the exhaust from an atmospheric boiler 38 °C (100 °F) vs. 204 °C (400 °F) a mechanical fan is always required to expel it, with the additional benefit of allowing the use of low-temperature exhaust piping (typically PVC in domestic applications) without insulation ...

3. Cottam power stations - Wikipedia

   en.wikipedia.org/wiki/Cottam_power_stations

   The main extraction pump discharged the condensate to No.1 D.C. heater from which it cascaded down to No.2 and then to No.3 D.C. heater by gravity. Two lift pumps delivered the condensate to No.4 D.C. heater, from which it cascaded through No.5 D.C. heater to two deaerator lift pumps.

4. Vapor-compression refrigeration - Wikipedia

   en.wikipedia.org/wiki/Vapor-compression...

   A representative pressure–volume diagram for a refrigeration cycle. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), [1] in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air conditioning of buildings and automobiles.

5. Flue-gas condensation - Wikipedia

   en.wikipedia.org/wiki/Flue-gas_condensation

   Flue gas condensation may cause the heat recovered to exceed the Lower Heating Value of the input fuel, and thus an efficiency greater than 100%. Since historically most combustion processes have not condensed the fuel, usual efficiency calculations assume the combustion products are not condensed.

6. Condenser (heat transfer) - Wikipedia

   en.wikipedia.org/wiki/Condenser_(heat_transfer)

   The condensate drips down and collects at the bottom, often in a built-in pan called a hotwell. The shell side often operates at a vacuum or partial vacuum, produced by the difference in specific volume between the steam and condensate. Conversely, the vapor can be fed through the tubes with the coolant water or air flowing around the outside.

7. Scroll compressor - Wikipedia

   en.wikipedia.org/wiki/Scroll_compressor

   A scroll compressor (also called spiral compressor, scroll pump and scroll vacuum pump) is a device for compressing air or refrigerant. [1] It is used in air conditioning equipment, as an automobile supercharger (where it is known as a scroll-type supercharger ) and as a vacuum pump .

8. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   These consist of a cylindrical vessel or container that keeps water continuously hot and ready to use. Typical sizes for household use range from 75 to 400 L (20 to 100 US gallons). These may use electricity, natural gas, propane, heating oil, solar, or other energy sources. Natural gas heaters are most popular in the US and most European ...

9. HVAC control system - Wikipedia

   en.wikipedia.org/wiki/HVAC_control_system

   This "subsystem" is vital to the performance and basic operation of the overall HVAC system. The DDC system is the "brain" of the HVAC system. It dictates the position of every damper and valve in a system. It determines which fans, pumps, and chiller run and at what speed or capacity.