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2. Low-flow fixtures - Wikipedia

   en.wikipedia.org/wiki/Low-flow_fixtures

   Kitchen and bathroom faucets were limited to a flow rate of 2.2 gpm (gallons per minute) at 60 psi, and residential shower heads were limited to a flowrate of 2.5 gpm at 80 psi. [ 3 ] In response to an increasing number of water shortages and increased water utility rates there has been recent legislation by many states leading the way in water ...

3. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   The heating element of an electric shower is immersed in the water stream, using an often replaceable nichrome resistive heating element which is often not sheathed and electrically isolated, in which case isolation is provided by earthing electrodes that directly touch the water before it exits the head. Electric shower heads with sheathed and ...

4. Chézy formula - Wikipedia

   en.wikipedia.org/wiki/Chézy_formula

   The Chézy Formula is a semi-empirical resistance equation [1] [2] which estimates mean flow velocity in open channel conduits. [3] The relationship was conceptualized and developed in 1768 by French physicist and engineer Antoine de Chézy (1718–1798) while designing Paris's water canal system.

5. Fanning friction factor - Wikipedia

   en.wikipedia.org/wiki/Fanning_friction_factor

   When the pipes have certain roughness <, this factor must be taken in account when the Fanning friction factor is calculated. The relationship between pipe roughness and Fanning friction factor was developed by Haaland (1983) under flow conditions of 4 ⋅ 10 4 < R e < 10 7 {\displaystyle 4\centerdot 10^{4}<Re<10^{7}}

6. British thermal unit - Wikipedia

   en.wikipedia.org/wiki/British_thermal_unit

   It was originally defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. It is also part of the United States customary units . [ 1 ] The SI unit for energy is the joule (J) ; one Btu equals about 1,055 J (varying within the range of 1,054–1,060 J depending on the specific definition of ...

7. Solar water heating - Wikipedia

   en.wikipedia.org/wiki/Solar_water_heating

   Calculators are available for estimating insolation at a site. [ 44 ] [ 45 ] [ 46 ] Below is a table that gives a rough indication of the specifications and energy that could be expected from a solar water heating system involving some 2 m 2 of absorber area of the collector, demonstrating two evacuated tube and three flat plate solar water ...