The use of hydrophobic tubes of the tube bundle for PSG–2300–2–8–I network water heater exemplified by Petrozavodsk central heating and power plant
DOI: 10.17586/1606-4313-2020-19-1-40-45
UDC 658.311
Ustinov Anton S. , Kuznetsov V.E., Eugene A. Pitukhin
Keywords: heat calculation, condensation, heat-transfer coefficient, hydrophobic surface.
UDC 658.311
The use of hydrophobic tubes of the tube bundle for PSG–2300–2–8–I network water heater exemplified by Petrozavodsk central heating and power plant
For citation: Ustinov A.S., Kuznetsov V.E., Pitukhin E.A. The use of hydrophobic tubes of the tube bundle for PSG–2300–2–8–I network water heater exemplified by Petrozavodsk central heating and power plant. Vestnik Mezhdunarodnoi akademii kholoda. 2020. No 1. p.40-45
Abstract
The paper presents thermal design of heat transfer from the steam to the water network in PSG-2300-2-8-I horizontal network water heaters installed at Petrozavodsk Central Heating and Power Plant, using the hydrophobic tube surface of the tube bundle. A method for obtaining a hydrophobic surface is considered. The average heat transfer coefficient of drip condensation for a horizontal tube bundle, the internal average heat transfer coefficient from the wall to network water, the average logarithmic temperature head in the counter-current flow scheme of heat carriers, and the heat transfer coefficient are calculated. The heating surface area, heating capacity, and steam consumption when using hydrophobic surface of the tube bundle are determined. Giving hydrophobic properties to the outer surface of the tubes in the tube bundle of the network water heater eliminates film condensation and allows going over to drip condensation. The process of heat transfer from steam to network water through the tube wall increases due to the lack of thermal resistance of the liquid boundary layer formed on the outside of the tube during film condensation. The use of hydrophobic tube surfaces provides greater heat transfer efficiency by increasing the heat transfer coefficient. This will reduce steam consumption or increase network water consumption, thereby providing more consumers with the heat energy needed for hot water supply and heating.
Abstract
The paper presents thermal design of heat transfer from the steam to the water network in PSG-2300-2-8-I horizontal network water heaters installed at Petrozavodsk Central Heating and Power Plant, using the hydrophobic tube surface of the tube bundle. A method for obtaining a hydrophobic surface is considered. The average heat transfer coefficient of drip condensation for a horizontal tube bundle, the internal average heat transfer coefficient from the wall to network water, the average logarithmic temperature head in the counter-current flow scheme of heat carriers, and the heat transfer coefficient are calculated. The heating surface area, heating capacity, and steam consumption when using hydrophobic surface of the tube bundle are determined. Giving hydrophobic properties to the outer surface of the tubes in the tube bundle of the network water heater eliminates film condensation and allows going over to drip condensation. The process of heat transfer from steam to network water through the tube wall increases due to the lack of thermal resistance of the liquid boundary layer formed on the outside of the tube during film condensation. The use of hydrophobic tube surfaces provides greater heat transfer efficiency by increasing the heat transfer coefficient. This will reduce steam consumption or increase network water consumption, thereby providing more consumers with the heat energy needed for hot water supply and heating.
Keywords: heat calculation, condensation, heat-transfer coefficient, hydrophobic surface.
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