One of the main tasks around the world is to reduce energy consumption with constant consumer comfort. The hot water supply system uses a significant part of thermal energy and requires no less attention than the heating or ventilation system. The amount of heat loss from hot water distribution systems is of great importance for the energy consumption of buildings. In winter, part of this heat is used for space heating, in summer they are unused and is considered as lost heat.
For this reason, this paper considers the influence of water velocity in the pipe, pipe size, and water temperature on the total heat losses in the insulated hot-water distribution system.
The data are presented in tabular and graphical form. A graph of the dependence of the amount of heat loss on the temperature and velocity of hot water is obtained.
Kapalo, P. & Lukáč, P. (2014). The hot water distribution systems analysis from heat losses point of view. 14th International Multidisciplinary Scientific Geoconference and EXPO, SGEM 2014; Albena; Bulgaria; Vol. 1(4), pp. 545-552.
Sieniutycz, S., Jeżowski, J. (2009) Energy Optimization in Process Systems. eBook ISBN: 9780080914428, Elsevier, Oxford, UK.
Keçebaş, A., Alkan, M.A., Bayhan, M. (2011). Thermo-economic analysis of pipe insulation for district heating piping systems, Applied Thermal Engineering, Vol. 31(17-18), pp. 3929-3937, ISSN 1359-4311. https://doi.org/10.1016/j.applthermaleng.2011.07.042
https://doi.org/10.1016/j.applthermaleng.2011.07.042
Öztürk, İ.T. & Karabay, H. & Bilgen, E. (2006). Thermo-economic optimization of hot water piping systems: A comparison study, Energy, Elsevier, vol. 31(12), pp. 2094-2107. DOI: 10.1016/j.energy.2005.10.008.
https://doi.org/10.1016/j.energy.2005.10.008
https://doi.org/10.1016/j.energy.2005.10.008
https://doi.org/10.1016/j.energy.2005.10.008
Bejan, A., Kraus, A. D. (2003) Heat Transfer Handbook. John Wiley & Sons, ISBN 0-471-39015-1.
Kapalo, P., Böszörmenyi, L. (2013). Energy analysis of hot water distribution system - interrupted operation. 2nd International Conference on Industrial Design and Mechanics Power, ICIDMP 2013; Nanjing; China; 24 August 2013 through 25 August 2013; Applied Mechanics and MaterialsVolume 437, 2013, Pages 1062-1065; Code 100448. https://doi.org/10.4028/www.scientific.net/AMM.437.1062
https://doi.org/10.4028/www.scientific.net/AMM.437.1062
Schack, A. (1965). Industrial heat transfer. London: Chapman and Hall. 1965
Wepfer, W. J., Gaggioli, R. A., and Obert, E. F. (1979). Economic Sizing of Steam Piping and Insulation. ASME. J. Eng. Ind. November 1979; 101(4): 427-433. https://doi.org/10.1115/1.3439532
https://doi.org/10.1115/1.3439532
Seddegh, S., Wang, X., Henderson, A.D. (2015). Numerical investigation of heat transfer mechanism in a vertical shell and tube latent heat energy storage system. Applied Thermal Engineering, Volume 87, 2015, Pages 698-706, ISSN 1359-4311, https://doi.org/10.1016/j.applthermaleng.2015.05.067
https://doi.org/10.1016/j.applthermaleng.2015.05.067
Gorzin, M., Hosseini, M.J. Ranjbar A.A., Bahrampoury, R. (2018). Investigation of PCM charging for the energy saving of domestic hot water system. Applied Thermal Engineering, Volume 137, 2018, Pages 659-668, ISSN 1359-4311, https://doi.org/10.1016/j.applthermaleng.2018.04.016
https://doi.org/10.1016/j.applthermaleng.2018.04.016
Maguire J., Fang X., Krarti M. (2012). An Analysis Model for Domestic Hot Water Distribution Systems. ASME 2011, 5-th International Conference on Energy Sustainability, August 7-10, 2011, Washington, DC, USA, Pages 1937-1946. https://doi.org/10.1115/ES2011-54145
https://doi.org/10.1115/ES2011-54145
CEN (2007). STN EN 15316-3-3. Heating systems in buildings - Method for calculation of system energy requirements and system efficiencies - Part 3-3: Domestic hot water systems, generation.
Act No. 321/2014 (2014). Coll. on Energy Efficiency and amendments of certain acts as amended. (in Slovak).