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2. Slip ratio (gas–liquid flow) - Wikipedia

   en.wikipedia.org/wiki/Slip_ratio_(gas–liquid_flow)

   Slip ratio (or velocity ratio) in gas–liquid (two-phase) flow, is defined as the ratio of the velocity of the gas phase to the velocity of the liquid phase. [ 1 ] In the homogeneous model of two-phase flow , the slip ratio is by definition assumed to be unity (no slip).

3. Energy factor - Wikipedia

   en.wikipedia.org/wiki/Energy_factor

   The energy factor metric only applies to residential water heaters, which are currently defined by fuel, type, and input capacity. [5] Generally, the EF number represents the thermal efficiency of the water heater as a percentage, since it is an average of the ratio of the theoretical heat required to raise the temperature of water drawn to the amount of energy actually consumed by the water ...

4. Here's How Often You Should Drain Your Water Heater ... - AOL

   www.aol.com/heres-often-drain-water-heater...

   Step 5: Once the tank is empty, turn the cold-water supply on to flush the tank with clean water until it runs clear from the drain valve. Step 6: Remove the hose and close your drain valve before ...

5. Slip factor - Wikipedia

   en.wikipedia.org/wiki/Slip_factor

   Mathematically, the Slip factor denoted by 'σ' is defined as the ratio of the actual & ideal values of the whirl velocity components at the exit of the impeller. The ideal values can be calculated using an analytical approach while the actual values should be observed experimentally.

6. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   In comparison, a typical 230 L (60 US gal) tank electric water heater has a 4.5 kW (15,000 BTU/h) heating element, which at 100% efficient results in a heating time of about 2.34 hours. At $0.16/kWh the electricity would cost $1.68.

7. Enthalpy–entropy chart - Wikipedia

   en.wikipedia.org/wiki/Enthalpy–entropy_chart

   The Mollier enthalpy–entropy diagram for water and steam. The "dryness fraction", x , gives the fraction by mass of gaseous water in the wet region, the remainder being droplets of liquid. An enthalpy–entropy chart , also known as the H – S chart or Mollier diagram , plots the total heat against entropy, [ 1 ] describing the enthalpy of a ...

8. Hypochlorous Acid: What Is It and Is It Safe for Your Skin? - AOL

   www.aol.com/hypochlorous-acid-safe-skin...

   Hypochlorous acid is a natural molecule in the body but can also be used in skincare. Experts share how it’s used and why it’s the latest buzzy ingredient.

9. Condensing boiler - Wikipedia

   en.wikipedia.org/wiki/Condensing_boiler

   Condensing boilers are water heaters typically used for heating systems that are fueled by gas or oil. When operated in the correct circumstances, a heating system can achieve high efficiency (greater than 90% on the higher heating value) by condensing water vapour found in the exhaust gases in a heat exchanger to preheat the circulating water.