Abstract
The article presents an original and innovative technical solution for the exploitation of low-temperature excess heat from hot water boilers that use gas or liquid fuel for the needs of high-temperature heating in buildings or in industry. The primary fuel efficiency used for hot water boilers can be significantly increased by utilizing the excess low-temperature heat of flue gases that are discharged into the environment and thus also reduce CO2 emissions. Hot water systems usually operate at higher temperatures of the heating water, which is transported to the heat consumer via supply pipe, and the cooled heating water is returned to the hot water boiler via the return pipe. For the excess low-temperature heat exploitation of the flue gases from hot water boiler, it is necessary to install a condenser in the flue gas discharge pipe, where condensation of water vapour present in the flue gas heats water or a mixture of water and glycol. The heating water, which is cooled and returned from the heat consumer via the return pipe, is led to the condenser of the high-temperature heat pump, where it is preheated and then led to the hot water boiler, where it is heated to the final temperature. A computer simulation with the Aspen plus software package for the series or parallel connection of high-temperature heat pump to a hot water heating system and the economic analysis of the excess heat exploitation from the flue gases are also performed.
Highlights
IntroductionThe use of fossil fuels has brought great pressure on the environment itself, scientists all around the world are investigating new environmentally friendly technologies that would be suitable for high penetration of renewable energies in the energy system [1], because renewable energies have shown huge potential in the reduction of greenhouse gas (GHG) emissions
In the last few decades, much effort has been invested in the European Union (EU) and the rest of the world into achieving cleaner air and reducing greenhouse gas (GHG) emissions.The use of fossil fuels has brought great pressure on the environment itself, scientists all around the world are investigating new environmentally friendly technologies that would be suitable for high penetration of renewable energies in the energy system [1], because renewable energies have shown huge potential in the reduction of GHG emissions
The article presents an innovative technical solution to increase the efficiency of primary fuel and
Summary
The use of fossil fuels has brought great pressure on the environment itself, scientists all around the world are investigating new environmentally friendly technologies that would be suitable for high penetration of renewable energies in the energy system [1], because renewable energies have shown huge potential in the reduction of GHG emissions. Agreements, protocols, and directives on environmental issues, such as the Paris Agreement [2], European Green Deal [3], or European Energy Efficiency Directive [4] have been signed to navigate all European and other world countries when switching the fossil-fuel-based systems to renewable energy sources, such as solar, wind, bioenergy, or geothermal energy [5]. Increasing the efficiency of new or existing heat-generation plants is one of the priorities in line with the EU’s commitments to reduce GHG emissions and achieve several environmental goals [6].
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