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2. Cooling tower - Wikipedia

   en.wikipedia.org/wiki/Cooling_tower

   A typical evaporative, forced draft open-loop cooling tower rejecting heat from the condenser water loop of an industrial chiller unit Natural draft wet cooling hyperboloid towers at Didcot Power Station (UK) Forced draft wet cooling towers (height: 34 meters) and natural draft wet cooling tower (height: 122 meters) in Westphalia, Germany Natural draft wet cooling tower in Dresden (Germany)

3. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   Diagram of natural draft gas furnace, early 20th century. The first category of furnaces is natural draft, atmospheric burner furnaces. These furnaces consisted of cast-iron or riveted-steel heat exchangers built within an outer shell of brick, masonry, or steel. The heat exchangers were vented through brick or masonry chimneys.

4. Draft (boiler) - Wikipedia

   en.wikipedia.org/wiki/Draft_(boiler)

   Natural draft: When air or flue gases flow due to the difference in density of the hot flue gases and cooler ambient gases. The difference in density creates a pressure differential that moves the hotter flue gases into the cooler surroundings. [2] Forced draft: When air or flue gases are maintained above atmospheric pressure.

5. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   External heat exchanger of an air source heat pump. An air source heat pump can be used to air condition the building during hot weather, and to warm the building using heat extracted from outdoor air in cold weather. Air-source heat pumps are generally uneconomic for outdoor temperatures much below freezing.

6. List of abbreviations in oil and gas exploration and production

   en.wikipedia.org/wiki/List_of_abbreviations_in...

   ONAN – oil natural air natural cooled transformer; ONNR – Office of Natural Resources Revenue (formerly MMS) OOE – offshore operation engineer (senior technical authority on an offshore oil platform [citation needed]) OOIP – original oil in place; OOT/S – out of tolerance/straightness; O/P – Over Pull

7. Thermal power station - Wikipedia

   en.wikipedia.org/wiki/Thermal_power_station

   The Secondary air fan takes air from the atmosphere and, first warms the air in the air preheater for better economy. Secondary air is mixed with the coal/primary air flow in the burners. The induced draft fan assists the FD fan by drawing out combustible gases from the furnace, maintaining slightly below atmospheric pressure in the furnace to ...