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Energy-efficient thermal energy generation and distribution in buildings
Published in Paul Tymkow, Savvas Tassou, Maria Kolokotroni, Hussam Jouhara, Building Services Design for Energy-Efficient Buildings, 2020
Paul Tymkow, Savvas Tassou, Maria Kolokotroni, Hussam Jouhara
Conventional boilers are designed such that the flue gas does not condense in the boiler. This precaution, which requires the boiler to operate with minimum water temperature of 60°C, is necessary to prevent corrosion of the construction materials of the boiler such as steel, cast iron and copper. New boilers, known as high-efficiency or condensing boilers, are specifically designed to condense the water vapour present in the flue gases using lower water return temperatures. This improves boiler efficiency to over 90% but requires the use of non-corrosive materials such as aluminium and stainless steel for the combustion chamber and heat exchanger. For this reason, condensing boilers are more expensive than conventional boilers, but the additional cost can be recovered very quickly from the savings in fuel costs.
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Published in Les Goring, Residential Surveying Matters and Building Terminology, 2023
Condensing boiler: This design of boiler provides up to 20% increased efficiency, when compared to similar traditional types of boilers. This is brought about by the heat-source gases that rise up through the central, primary heat exchanger in the boiler, being diverted to the left and the right at the top, to each go back down the inner-sides of the boiler, over the surface of secondary heat exchangers. This reduces the temperature and causes the water vapour to condense and release the latent heat that would otherwise escape with the flue gases.
Improving Energy Efficiency in Buildings: Challenges and Opportunities in the European Context
Published in Amritanshu Shukla, Atul Sharma, Sustainability through Energy-Efficient Buildings, 2018
Condensing boilers are an efficient heat-generation system that uses an additional heat exchanger to extract extra heat by condensing water vapor from combustion products. Heat pumps can be used for space heating and hot water, increasing the amount of renewables.
Predictive maintenance: assessment of potentials for residential heating systems
Published in International Journal of Computer Integrated Manufacturing, 2023
Gas boiler. Due to their high thermal efficiency, relatively low emissions, and convenient fuel feed system, natural-gas-fired boilers have gradually gained acceptance in the process heat sector. Typically, a conventional natural-gas-fired boiler achieves thermal efficiency around 70–80% as it directly exhausts the flue gas at temperatures of 150–200°C, which causes a large heat loss. To recover this deferred heat from the water vapor present in the flue gas of natural-gas-fired boilers, condensing boilers were developed in the 1970s. Here, a flue gas condenser is installed at the exit of the flue gas from a conventional gas boiler in which the flue gas is chilled below the dew point of the water vapor in the flue gas before it leaves the boiler. This allows the condensing boiler to have a higher efficiency (Qu, Abdelaziz, and Yin 2014).
Respiratory assessment of refractory ceramic fibers in a heating technician population
Published in Journal of Occupational and Environmental Hygiene, 2018
David Lucas, Vincent Clamagirand, Pascale Capellmann, Agnès Hervé, Gilles Mauguen, Yannik Le Mer, Dominique Jegaden
Our study covered the analysis of air samples during phases of exposure, i.e., operations for the removal of hot skirts insulating the heating bodies of wall-mounted or atmospheric boilers and the insulating plates in the combustion chambers of condensing boilers. If these materials are worn out, they should be replaced in order to avoid boiler fires. Another source of exposure in the profession comes from the removal of gaskets from doors or burners of boilers on the floor.[12] This was not evaluated in our study. While most of the units in France are atmospheric boilers, over the past 5–6 years, condensing boilers have increased in number. Replacement of materials containing RCFs with wool-based substitutes referred to as AES varies according to the models of atmospheric boilers from the end of the 1990s to 2003.[10] The main manufacturer of burners for condensing boilers sold in France announced the replacement of RCFs in 2013. Keeping in mind that the average working life of atmospheric or condensation boilers is estimated at about 20 years, we can consider that there may be interventions involving exposure until about 2020 for atmospheric boilers and 2033 for condensing boilers.
A coupling energy system of 10 clean-energy heating systems: A case study in Shandong province in China
Published in International Journal of Green Energy, 2021
Yalin Wang, Guanyi Chen, Beibei Yan, Rob Bastiaans
System features: The advantage is that the boiler can fully recover the heat from the flue gas. From the perspective of the design, there is no waste of energy in this system because the boiler will start or stop its procedure according to the actual heat demand. Comparing to the traditional boiler, it can save 20% of the fuel cost. This system is super safe with a total intelligent operation, without noise and pollution. The condensing boiler can realize three main achievements of low nitrogen emission, high condensing efficiency, and long service life at the same time. The design temperature of the supply and return water of the heating system is 60°C/45°C, and the design pressure is 1.6 MPa.