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The DOE implemented efficiency regulations to prohibit new non-condensing gas furnaces by 2028, by requiring that non-weatherized gas furnaces achieve an annual fuel utilization efficiency of 95% ...
The annual fuel utilization efficiency (AFUE; pronounced 'A'-'Few' or 'A'-'F'-'U'-'E') is a thermal efficiency measure of space-heating furnaces and boilers.The AFUE differs from the true 'thermal efficiency' in that it is not a steady-state, peak measure of conversion efficiency, but instead attempts to represent the actual, season-long, average efficiency of that piece of equipment ...
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.
The data they used were from a gas furnace. These data are well known as the Box and Jenkins gas furnace data for benchmarking predictive models. Commandeur & Koopman (2007, §10.4) [2] argue that the Box–Jenkins approach is fundamentally problematic. The problem arises because in "the economic and social fields, real series are never ...
PureCell System says that its users will see lower energy costs, [2] reduced emissions, 95% system efficiency, 10-year cell stack durability [3] and 20-year product life. [ 4 ] It uses a combustion-free process with natural gas and converts heat exhaust into cooling and heating, turning potential waste into useful energy.
The gas turbine exhaust supplies combustion air for the atmospheric circulating fluidized-bed combustor that burns the char from the PCFB partial gasifier. CHIPPS. A CHIPPS system is similar, but uses a furnace instead of an atmospheric fluidized-bed combustor. It also has gas turbine air preheater tubes to increase gas turbine cycle efficiency.
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