Improving the energy efficiency of HVAC systems under the variable mode in the office center in Zolochiv, Lviv region
Students Name: Hrekh Roman
Qualification Level: magister
Speciality: Heat and Gas Supply and Ventilation
Institute: Institute of Civil Engineering and Building Systems
Mode of Study: part
Academic Year: 2021-2022 н.р.
Language of Defence: ukrainian
Abstract: The purpose of the master’s qualification work is to develop options for design solutions for microclimate systems in the office center. Object of study - The use of a heat pump for the heating system in the transition period of the year for the office center The subject of research is the efficiency of using a heat pump for a heating system in comparison with traditional boilers (gas, electric). Also, the expediency of using air conditioners as the main source of heat is considered in the work. This project presents all the necessary design parameters of outdoor and indoor air. Based on the calculated heat losses, a water two-pipe heating system was designed and heating devices were choosen. And also on the basis of the received data, in the project diameters of pipelines of heating system were selected. According to the calculated data, the boiler unit, ventilation and refrigeration equipment was selected. To maintain a comfortable temperature regime in the building, different types of heating systems have been designed, which differ in the schemes of heat flow. Several building heating options are designed in the building at the same time. The first option is a horizontal two-pipe closed heating system with a heat source coming from a gas boiler. The second possible option, also a water system with the only difference from the first is the used heat pump air-water, which works in pair with the boiler and provides all the necessary heat loss in the building. The heat pump can be used in pair with both a boiler and an electric heater. This option provides the most efficient consumption of resources. The third option is heating with separate split air conditioners. The reason for this choice is quite simple, the efficiency of air conditioners as well as heat pumps is the consumption of electricity relative to the amount of heat they emit, for example an air conditioner that emits 2.5 kW of heat / cold while consuming only 600 watts. Since the usual heating system is well known, I will focus on the latter option, heating with air conditioning. In this paper, selected individual split air conditioners whose advantage is the possibility of separate adjustment in each room that will satisfy all people working in the building, as well as the ability to turn them off completely if necessary, selected split air conditioners instead of multi-split or VRw systems. is the use of several indoor and one outdoor unit. These systems are more complex to install, adjust and design. The advantage is that such systems take up little space in the environment and in small spaces they are the way out, and in the presence of free space split systems are better, cheaper and easier to install and maintain. According to the results of calculations, it was concluded that air conditioning is cheaper in price and operation, and in case of problems they are simpler in terms of equipment replacement. Key words - air conditioning, alternative heating system - heat pumps. List of used literature sources 1. DBN B.2.6 - 31: 2013 Thermal insulation of buildings (as amended in 2013 and 2016 - Ministry of Construction of Ukraine, Kyiv, 2013. 2. DSTU-N B B.1.1-27: 2010 Construction climatology - Ministry of Energy of Ukraine, Kyiv, 2010. - 127 art. 3. DBN-V.2.5.-67: 2013. Heating, ventilation and air conditioning. The official edition. Kyiv 20I3. – 141p. 4. Internal sanitary devices: Handbook of the designer. Part 1 Heating /V.N. Богословский, Б.А. Krupnov, A.N. Scanavi et al .; Under. ed. N.G. Staroverova and Yu.N. Schiller - exit, rework. And extra. – M .: Stroyizdat, 1990.-344p. 5. DBN B.2.2-25: 2009 Food enterprises. –85 p. 6. Zhukovsky SS, Labay VY Energy supply systems and microclimate of buildings and structures: A textbook for WHO. - Lviv: Astronomical and Geodetic Society, 2000. - 259p. 7. SNiP 2.04.05-86. Heating, ventilation and air conditioning. - М .: CITP Gosstroy USSR, 1988. – 64p. 8. Zhukovsky SS Labay VY "Energy supply systems and microclimate of buildings and structures" Section №3.2 Art. 37 "Organization of air exchange of premises". 9. Zhukovsky SS Structural features of source (filtration) air distributors and proposals for their improvement / S.S. Zhukovsky, G.M. Klymenko // Scientific Bulletin of the National Forestry University of Ukraine: coll. nau.-teh. work. - Lviv: NLTUU, 2007. - Issue. 17.6. - P. 101-106. 10. Displacement ventilation in industrial buildings. - I .: AVOK-PRESS, 2003 11. Livchak A., Nall D. Displacement Ventilation - Application for Hot and Humid Climate / ProceedingsofClima2000.Napoli, Italy.2001 12. VENTS design instruction - 5/2020. 13. Vent ventilation systems, catalog - 2021. 14. Technical passport VENTSVKR 4E. 15. Duct fans "Vents", catalog - 2021. 16. Ventilation units "AEROMASTER." 17. JANHREBEC ventilation systems. 18. Instructions for designing KERMOPROFIL pipelines.