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  2. One-repetition maximum - Wikipedia

    en.wikipedia.org/wiki/One-repetition_maximum

    This chart compares the different formulas. The formulas greatly diverge after about 10 reps. The 1RM can also be estimated indirectly using repetition testing on submaximal loads, as popularized by the use of 1RM calculators. Although in many cases the estimate is reasonable, in other cases the estimate may vary by 10% or more from the actual ...

  3. Enthalpy–entropy chart - Wikipedia

    en.wikipedia.org/wiki/Enthalpy–entropy_chart

    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 thermodynamic system. [2] A typical chart covers a pressure range of 0.01–1000 bar , and temperatures up to 800 degrees Celsius . [ 3 ]

  4. Solar thermal collector - Wikipedia

    en.wikipedia.org/wiki/Solar_thermal_collector

    Solar water heating systems are most likely to be cost effective for facilities with water heating systems that are expensive to operate, or with operations such as laundries or kitchens that require large quantities of hot water. Unglazed liquid collectors are commonly used to heat water for swimming pools but can also be applied to large ...

  5. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    A district heating system uses centrally located boilers or water heaters and circulates heat energy to individual customers by circulating hot water or steam. This has the advantage of a central highly efficient energy converter that can use the best available pollution controls, and that is professionally operated.

  6. Saturation dome - Wikipedia

    en.wikipedia.org/wiki/Saturation_Dome

    A saturation dome uses the projection of a P–v–T diagram (pressure, specific volume, and temperature) onto the P–v plane. The points that create the left-hand side of the dome represent the saturated liquid states, while the points on the right-hand side represent the saturated vapor states (commonly referred to as the “dry” region).

  7. Renewable energy in the United States - Wikipedia

    en.wikipedia.org/wiki/Renewable_energy_in_the...

    Assuming that 40 percent of existing homes in the United States have adequate access to sunlight, 29 million solar water heaters could be installed. [70] Solar water heaters can operate in any climate. Performance varies depending on how much solar energy is available at the site, as well as how cold the water coming into the system is.

  8. Moody chart - Wikipedia

    en.wikipedia.org/wiki/Moody_chart

    In engineering, the Moody chart or Moody diagram (also Stanton diagram) is a graph in non-dimensional form that relates the Darcy–Weisbach friction factor f D, Reynolds number Re, and surface roughness for fully developed flow in a circular pipe. It can be used to predict pressure drop or flow rate down such a pipe.

  9. Underfloor heating - Wikipedia

    en.wikipedia.org/wiki/Underfloor_heating

    Hydronic systems use water or a mix of water and anti-freeze such as propylene glycol [27] as the heat transfer fluid in a "closed-loop" that is recirculated between the floor and the boiler. Various types of pipes are available specifically for hydronic underfloor heating and cooling systems and are generally made from polyethylene including ...

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