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2. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   High-efficiency condensing furnaces condense the water vapor (one of the by-products of gas combustion) and extract the latent heat to pre-heat the incoming furnace airflow, using a second heat exchanger. [2] This increases the efficiency (energy delivered into the building vs. heating value of gas purchased) to over 90%.

3. New York City steam system - Wikipedia

   en.wikipedia.org/wiki/New_York_City_steam_system

   Approximately 30% of the ConEd steam system's installed capacity and 50% of the annual steam generated comes from cogeneration. [7] Cogeneration and Heat Recovery Steam Generation (HRSG) significantly increase the fuel efficiency of cogenerated electricity and thereby reduce the emission of pollutants, such as NOx, sulfur dioxide, carbon dioxide, and particulate matter, as well as the city's ...

4. Heat pump and refrigeration cycle - Wikipedia

   en.wikipedia.org/wiki/Heat_pump_and...

   Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pump, air conditioning and refrigeration systems. [1] A heat pump is a mechanical system that transmits heat from one location (the "source") at a certain temperature to another location (the "sink" or "heat sink") at a higher temperature ...

5. Heat recovery ventilation - Wikipedia

   en.wikipedia.org/wiki/Heat_recovery_ventilation

   Diagramatic operation of a thermal wheel Ljungström Air Preheater by Swedish engineer Fredrik Ljungström (1875–1964). A thermal wheel, also known as a rotary heat exchanger, or rotary air-to-air enthalpy wheel, energy recovery wheel, or heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of air-handling units or rooftop ...

6. Heat recovery steam generator - Wikipedia

   en.wikipedia.org/wiki/Heat_recovery_steam_generator

   They can use a gas turbine to produce high-reliability electricity for campus use. The HRSG can recover the heat from the gas turbine to produce steam/hot water for district heating or cooling. [1] Large ocean vessels (e.g., Emma Maersk) make use of heat recovery so that their oil-fired boilers can be shut down while underway. [1]

7. District heating - Wikipedia

   en.wikipedia.org/wiki/District_heating

   The Spittelau incineration plant is one of several plants that provide district heating in Vienna, Austria. Animated image showing how district heating works. District heating (also known as heat networks) is a system for distributing heat generated in a centralized location through a system of insulated pipes for residential and commercial heating requirements such as space heating and water ...

8. Ground source heat pump - Wikipedia

   en.wikipedia.org/wiki/Ground_source_heat_pump

   A heat pump in combination with heat and cold storage. A ground source heat pump (also geothermal heat pump) is a heating/cooling system for buildings that use a type of heat pump to transfer heat to or from the ground, taking advantage of the relative constancy of temperatures of the earth through the seasons.

9. York gas field - Wikipedia

   en.wikipedia.org/wiki/York_gas_field

   The York field extends over UK Blocks 47/2a, 47/3a, 47/3d and 47/3e. The field was discovered in 1993 by well 47/02-1 drilled by the Noble Julie Robinson. The reservoir has reserves of 106 billion cubic feet [1] or 3 billion cubic metres. [2] Centrica owned and developed the York gas field, now owned and operated by Spirit Energy. [3]