Analysis of convective heat transfer from storage heater external surfaces

Oleg Lysak

Анотація


The aim of the article is to specify the parameters of the convective heat transfer between the outer surfaces of a static storage heater (a storage heater that has airways but it doesn’t have any fan) and the surrounding air. The article shows the heat transfer between the air at 20 °C (room temperature) and the outer surfaces of static storage heaters at two temperatures of 40 and 60 °C. The analysis is performed under the condition that all the surfaces of the device contact with the outside air (the device is placed on the feet) and natural convection occurs. In the analysis the influence of the device feet is neglected and its design is simplified to a rectangular block. The findings are compared with the characteristics of the existing models of storage heaters and used to determine the share of the outer surface convective heat transfer from the total heat output of the device. The factors that lead to the change of the convective heat transfer from the outer surfaces are analyzed. For storage heaters shown in the article with an output in the range from 800 to 3200 W the share of the convective heat transfer from the outer surfaces (1) at 60 °C is respectively 58 % and 31 % and (2) at 40 °C from 25 % to 13 %. The share of the convective heat transfer from the outer surfaces decreases during the growth of the device output, and consequently – the increase of its outer surface area. The share of the convective heat transfer from the outer surfaces increases due to the rise of the outer surface temperature. Also the convective heat transfer from only vertical outer surfaces is compared with the convective heat transfer from all outer surfaces. They are also compared at different outer surface temperatures for the same storage heater type.


Повний текст:

PDF (English)

Посилання


Belimenko, S. S. (2015), ²Sovershenstvovanie konstruktivnyh i rezhimnyh parametrov tverdotel'nyh jelek-troteploakkumuljatorov [Improvement constructive and regime parametres solid electric thermal batteries]², Abstract of Ph.D. dissertation, 05.14.06, National Metallurgical Academy of Ukraine, Dnepropetrovsk, Ukraine.

Malkin, E. S. and Lysak, O. V. (2014), ²Teploakumuljujuchi elektropechi. Terminologija i klasyfikacija [Storage heaters. The terminology and the classification]², Promyslova elektroenergetyka ta elektrotehnika (Promelektro) [Industrial power and electrical engineering], no. 3, pp. 69–74, ISSN 2409-2924.

Lysak, O. and Malkin, E. (2015), ²Vybor teploakkumurilujushhih jelektropechej pri vnedrenii v Ukraine [Selection of storage heaters for implementation in Ukraine]², Construction of optimized energy potential, no. 1, pp. 117–125, Politechnika Częstochowska, Częstochowa, Poland, ISSN 2299-8535.

Lysak, O. (2015), ²Analiz konvektyvnoi' teploviddachi vid frontal'noi' poverhni teploakumuljujuchoi' elektropechi [Analysis of convective heat transfer from storage heater front panels]², Bulletin of the Kiev National University Technologies and Design : Technical Science Series, no. 5(90), pp. 15–23, ISSN 1813-6796.

Thirumaleshwar, M. (2009), Fundamentals of Heat and Mass Transfer, second impression edn., Dorling Kindersley, New Delhi, India, ISBN 978-81-7758-519-3.

²ADS STATIC STORAGE HEATERS : TECHNICAL DATA SHEET². available at: http://www.elnur-global.com/dl-files/elnures/ft/en/f_ads_en.pdf (Accessed 10 January 2016).

Mikheev, M. A. and Mikheeva, I. M. (1977), Osnovy teploperedachi [Fundamentals of Heat Transfer], Energia, Moscow, Russian.


Пристатейна бібліографія ГОСТ


1    Белименко, С. С. Совершенствование конструктивных и режимных параметров твердотельных электротеплоаккумуляторов : автореф. дис. … канд. техн. наук : 05.14.06 / Сергей Сергеевич Белименко; Национальная металлургическая академия Украины. – Днепропетровск, 2015. – 21 с.

 

2    Малкін, Е. С. Теплоакумулюючі електропечі. Термінологія і класифікація [Текст] / Е. С. Малкін, О. В. Лисак // Промислова електроенергетика та електротехніка (Промелектро). – 2014. – № 3. – С. 69–74. – ISSN 2409-2924.

 

3    Лысак, Олег. Выбор теплоаккумурилующих электропечей при внедрении в Украине [Текст] / Олег Лысак, Эдуард Малкин // Budownictwo o zoptymalizowanym potencjale energetycznym. – Częstochowa (Poland) : Politechnika Częstochowska, 2015. – № 1 – С. 117–125. – ISSN 2299-8535.

 

4    Лисак, О. В. Аналіз конвективної тепловіддачі від фронтальної поверхні теплоакумулюючої електропечі [Текст] / О. В. Лисак // Вісник Київського національного університету технологій та дизайну : «Технічні серії». – 2015. – № 5(90). – С. 15–23. – ISSN 1813-6796.

 

5    Thirumaleshwar, M. Fundamentals of Heat and Mass Transfer, second impression edn. [Text] / M. Thirumaleshwar. – New Delhi : Dorling Kindersley, 2009. – 766 c. – ISBN 978-81-7758-519-3.

 

6    ADS STATIC STORAGE HEATERS : TECHNICAL DATA SHEET [Електронний ресурс]. – Режим доступу: http://www.elnur-global.com/dl-files/elnures/ft/en/f_ads_en.pdf. – Назва з екрану. – 10.01.2016 р.

 

7    Михеев, М. А. Основы теплопередачи [Текст] / М. А. Михеев, И. М. Михеева. – 2-е изд., стер. – Москва : Энергия, 1977. – 343 с.





DOI: https://doi.org/10.20998/2078-774X.2016.10.16

Посилання

  • Поки немає зовнішніх посилань.