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2. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

3. Water heat recycling - Wikipedia

   en.wikipedia.org/wiki/Water_heat_recycling

   When recycling water from a bath (100–150 litres) or shower (50–80 litres) the waste water temperature is circa 20–25 °C. An in-house greywater recycling tank holds 150–175 litres allowing for the majority of waste water to be stored. Utilizing a built in copper heat exchange with circulation pump the residual heat is recovered and ...

4. Illinois - Wikipedia

   en.wikipedia.org/wiki/Illinois

   Illinois (/ ˌ ɪ l ɪ ˈ n ɔɪ / ⓘ IL-in-OY) is a state in the Midwestern region of the United States.It borders on Lake Michigan to its northeast, the Mississippi River to its west, and the Wabash and Ohio rivers to its south.

5. Pennsylvania - Wikipedia

   en.wikipedia.org/wiki/Pennsylvania

   Pennsylvania has a high in-migration of black and Hispanic people from other nearby states with the eastern and south-central portions of the state seeing the bulk of the increases. [108] [109] Among the state's black population, the vast majority in the state are African American.

6. 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 ...

7. Texas - Wikipedia

   en.wikipedia.org/wiki/Texas

   As of January 1, 2021, Texas has proved recoverable petroleum reserves of about 15.6 billion barrels (2.48 × 10 9 m 3) of crude oil (44% of the known U.S. reserves) and 9.5 billion barrels (1.51 × 10 9 m 3) of natural gas liquids. [274] [275] The state's refineries can process 5.95 million barrels (946,000 m 3) of oil a day.