The effects of heat-pump control during off-peak electricity tariff periods in conjunction with varying building fabric characteristics were analysed and the results show that for the locations investigated, running costs and CO2 emissions were lower for the ASHP platform than for a comparative gas boiler heating system.
Compared to a gas boiler, solar thermal systems are a better option for only five out of 11 environmental impacts considered, with global warming and depletion of fossil resources being lower by 88%and83%3%, respectively.
The proposed systems are a gas boiler-based cogeneration system firing clean natural gas, circulating fluidized bed boiler-based cogeneration system incorporating SO2 abatement during combustion, pulverized coal boiler-based cogeneration system encompassing desulfurization and denitration after combustion, and gas steam combined cogeneration system firing clean natural gas.
The CCHP systems include natural gas internal combustion engine, heat recovery system, gas boiler, absorption chiller, and heat exchangers.
The numerical results show that the blackout scenario will not have any negative impact on investigated gas part of the boiler system since the observed lowest negative furnace pressure of −36 mbar can be handled with current state of the art technology.
However, their potential is hampered because they need a back-up heating system, typically gas boiler.
Both the practicality of hybrid ground source heat pump system with gas boiler and the reliability of the design simulation software are verified by the actual project.
The estimation of acid dew point temperature (Tadp) of flue gas, which is mainly determined by SO3 concentration and steam concentration (CH2O) in flue gas, is crucial for coal-fired boiler system design.
The results are compared against those obtained for the conventional system with a gas boiler in terms of the primary energy consumption as well as of investment and operating costs.
The results show that when the exhausted gas or inlet air temperature increases 10-15°C 10-15°Catheoss of exheatt gas decreases 0.8%-1% and thermalossficiency of boilexhaustem increases 0.8%-1%; The crucial factors that can affect thermal efficiency are exhaust gas temperature andecreaseslatile ratio; seven optimized schemes are designed for a case of boiler system.
