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[85]: 98 Costs of gas peakers are substantial, and include both the cost of fuel and external costs of its combustion. Costs of its combustion include emission of greenhouse gases carbon monoxide and dioxide, as well as nitrogen oxides (NO x), which damage the human respiratory system and contribute to acid rain. [88]
In some areas electrical resistance heating is used, especially where the cost of electricity is low or the primary purpose is for air conditioning. Modern high-efficiency furnaces can be up to 98% efficient and operate without a chimney, with a typical gas furnace being about 80% efficient. [ 1 ]
Condensing boiler manufacturers claim that up to 98% thermal efficiency can be achieved, [3] compared to 70%–80% with conventional designs (based on the higher heating value of fuels). Typical models offer efficiencies around 90%, which brings most brands of condensing gas boiler in to the highest available categories for energy efficiency.
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.
The average cost of gas has decreased 15% in the last two years, from when it was $4.27 per gallon. The highest recorded average price of regular gas was in June 2022 at $5.06 per gallon.
Supplementary firing can raise exhaust temperatures from 600 °C (GT exhaust) to 800 or even 1000 °C. Supplemental firing does not raise the efficiency of most combined cycles. For single boilers it can raise the efficiency if fired to 700–750 °C; for multiple boilers however, the flexibility of the plant should be the major attraction.
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