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2. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   The energy cost of heating is one of the main costs of operating a building in a cold climate. Some central heating plants can switch fuels for reasons of economy and convenience; for example, a home owner may install a wood-fired furnace with electrical backup for occasional unattended operation.

3. Economizer - Wikipedia

   en.wikipedia.org/wiki/Economizer

   The temperature of the gases can be lowered from the boiling temperature of the fluid to little more than the incoming feed water temperature while preheating that feed water to the boiling temperature. High pressure boilers typically have larger economizer surfaces than low pressure boilers.

4. Cost estimates come back for boiler, systems ... - AOL

   www.aol.com/cost-estimates-come-back-boiler...

   Nov. 21—The replacement of mechanical systems at three schools in the district is estimated to cost about $3.96 million, engineers with ISG Inc. presented to the Albert Lea school board Monday.

5. Coefficient of performance - Wikipedia

   en.wikipedia.org/wiki/Coefficient_of_performance

   For a heating system this would mean two things: Reducing the output temperature to around 30 °C (86 °F) which requires piped floor, wall or ceiling heating, or oversized water to air heaters. Increasing the input temperature (e.g. by using an oversized ground source or by access to a solar-assisted thermal bank [10]).

6. Pinch analysis - Wikipedia

   en.wikipedia.org/wiki/Pinch_analysis

   In order to reduce capital cost, in practice a minimum temperature difference (Δ T) at the pinch point is demanded, e.g., 10 °F. It is possible to estimate the heat exchanger area and capital cost, and hence the optimal Δ T minimum value. However, the cost curve is quite flat and the optimum may be affected by "topology traps".

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