Modelling of Technological Solutions to 4th Generation DH Systems
| Autor: | Toms Prodanuks, Girts Vigants, Edgars Vigants, Ivars Veidenbergs, Dagnija Blumberga |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Renewable Energy
Sustainability and the Environment business.industry 4th generation dh systems 020209 energy direct contact heat exchanger TJ807-830 02 engineering and technology 010501 environmental sciences 01 natural sciences Renewable energy sources condensing unit wood chip boiler house 0202 electrical engineering electronic engineering information engineering Environmental science Process engineering business 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Environmental and Climate Technologies, Vol 20, Iss 1, Pp 5-23 (2017) |
| ISSN: | 2255-8837 |
| DOI: | 10.1515/rtuect-2017-0007 |
| Popis: | Flue gas evaporation and condensing processes are investigated in a direct contact heat exchanger - condensing unit, which is installed after a furnace. By using equations describing processes of heat and mass transfer, as well as correlation coherences for determining wet gas parameters, a model is formed to create a no-filling, direct contact heat exchanger. Results of heating equipment modelling and experimental research on the gas condensing unit show, that the capacity of the heat exchanger increases, when return temperature of the district heating network decreases. In order to explain these alterations in capacity, the character of the changes in water vapour partial pressure, in the propelling force of mass transfer, in gas and water temperatures and in the determining parameters of heat transfer are used in this article. The positive impact on the direct contact heat exchanger by the decreased district heating (DH) network return temperature shows that introduction of the 4th generation DH system increases the energy efficiency of the heat exchanger. In order to make an assessment, the methodology suggested in the paper can be used in each particular situation. |
| Databáze: | OpenAIRE |
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