Abstract
In this article the analysis of heat losses caused by thermal bridges that occur in the steam boiler OP-140 is presented. Identification of these bridges were conducted with use of thermographic camera. Heat losses were evaluated based on methodology of VDI 4610 standard, but instead of its simplified equations, criterial equations based on Nusselt number were used. Obtained values of annual heat losses and heat flux density corresponding to the fully insulated boiler surfaces were compared to heat losses generated by thermal bridges located in the same areas. The emphasis is put on the role of industrial insulation in heat losses reduction.
Highlights
The amount of heat losses in power boilers has a significant influence on their capability to process energy
Installed thermal insulations were performed according to the withdrawn ordinance of the Minister of Economy dated September 17 1999 concerning safety and hygiene of work with power equipment and installations, which stated that the external surface temperature of the insulation layer should not exceed 60oC – protecting workers from heat-related injuries [1]
Total heat losses are calculated as the sum of heat losses that occur regularly on the boiler insulation surface and heat losses generated by thermal bridges
Summary
The amount of heat losses in power boilers has a significant influence on their capability to process energy. Installed thermal insulations were performed according to the withdrawn ordinance of the Minister of Economy dated September 17 1999 concerning safety and hygiene of work with power equipment and installations, which stated that the external surface temperature of the insulation layer should not exceed 60oC – protecting workers from heat-related injuries [1]. In most cases, such insulation had nothing to do with heat losses reduction nor with reaching the maximum return on investment at potentially lowest losses of energy. Regulations targeted at reduction of carbon dioxide emissions as well as growing awareness of energy manufacturers create favourable environment for:
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