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-99.  OSHA (2018, Jan 11), Occupational Safety and Health Administration, Technical Manual, Section III, Chapter 7, “Optimum analysis of energy conversion for solar water heatingsystem legionnaires' disease”, available: https://www.osha.gov/dts/osta/otm/otm_iii/otm_iii_7.html .  Mathys (2008). Occurrence of Legionella in hot water systems of single-family residences in suburbs of two German cities with special reference to solar and district heating. Int. J. Hyg. Environ. Health. 2008;211:179–185: doi.org/10.1016/j.ijheh.2007.02.004  Knapp, S. & Nordell, B
Rational and efficient use of thermal energy in recent years has resulted in significant changes in the heating system as well as technological progress. In order to design a heating system properly and exploit it correctly, an in-depth understanding of the hydraulic issues is necessary. Application of automatic control system in various sectors of heating network has resulted in a more dynamic and efficient work of the whole system. For proper operation of a thermal system it is also necessary to compile a correct heat balance and a regulation graph that allows to determine the optimal mass and parameters of heat medium. The article discusses the problems of supplying heat process, types of thermal systems and selected problems of hydraulic issues that occur in the heating networks.
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References Bratasz L., Kozlowski, R., Camuffo D., Pagan E., 2007: Impact of indoor heating on painted wood: Monitoring the altarpiece in the church of Santa Maria Magdalena in Rocca Pietore , Italy. Stud. Conserv., 52, pp.199–210. Camuffo, D., Pagan, E., Schellen, H. & Limpens-Neilen, D., 2014. A practical guide to the pros and cons of the various heatingsystems with a view to the conservation of the Cultural Heritage in Churches . Results of the European Project Friendly Heating EVK4-CT-2001-00067, s.l.: s.n. Camuffo, D., Pagan, E., Rissanen S, Bratasz L
://ens.dk/sites/ens.dk/files/energistyrelsen/Nyheder/district_heating_danish-chinese_experiences.pdf  Zhang L., Gudmundsson O., Li H., Svendsen S. Comparison of District HeatingSystems Used in China and Denmark. International Journal of Sustainable and Green Energy 2015:4(3):102–116.  Resolution of the Government of the RF of 13.02.2006 No.83 (ed. of 23.08.2014). On the approval of rules for the determining and providing technical conditions for the connection of a capital construction object to the engineering and technical services, and rules of connecting a capital construction object to the networks of engineering and technical services. Moscow. (in
The paper presents the possibilities of increasing energy efficiency of sacral buildings. Churches in the Zawiercie pastoral district of the Archdiocese of Czestochowa have been used as examples of typical sacral buildings of low energy efficiency. Such structures need to be thermally insulated during their use. Certain possibilities of raising the energy efficiency of churches have been presented. The paper describes different systems: increasing of wall and roof insulation, installation of new windows, and modern heating systems. Installation of a new heating system has been considered the most effective and the easiest to be implemented one.
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