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DEVELOPMENT OF THE SYSTEM OF SOLAR COLLECTORS
PhD stud., K.Sh.Sharif, Tashkent Institute of Architecture and Civil Engineering
Keywords: Devices, draining method, improving efficiency, thermal energy, solar heating systems, solar collectors.
Abstract: In this research paper describes drainage, use of antifreeze, electric heating, use of slow circulation, the advantages and disadvantages were identified and one was chosen for improvement: self-draining method of solar devices.
There are 4 main methods to protect modern solar collectors from damage: drainage, use of antifreeze, electric heating, use of slow circulation, the advantages and disadvantages were identified and one was chosen for improvement: self-draining method of solar devices.
One of the most beneficial areas in the field of solar energy use is the solar heating and hot water supply systems of these buildings. However, these systems are not widely used in the country. The reason for not expanding the use of solar energy for heating buildings is mainly the high capital expenditures for the construction of geosystems compared to the system of funds used in practice[1].
Increasing the practical use of solar energy for hot water supply and heating of various facilities in Uzbekistan, instead of expensive multi-circuit systems using antifreeze to protect solar collectors from damage in winter and summer, high-capacity simple single-circuit energy-efficient and reliable raises the issue of the development of self-draining solar devices.
Solar collectors are a key element of aquatic solar heat supply systems, operating under conditions of extremely variable sources of solar energy and outdoor air temperature in a very wide range: from low negative particular in winter to high positive particular in summer. Such conditions of use can lead to the failure of solar collectors: in winter as a result of freezing of water at night, and in summer - as a result of boiling water in stagnation mode (when the circulation stops) and the temperature inside solar collectors rises to 200oC and 300oC in vacuum[2].
The use of antifreeze in high-capacity solar devices is a very expensive solution due to the large area of solar collectors, moreover, this solution does not solve the problem of summer protection of solar collectors due to boiling antifreeze in the summer.
Fig.1. drain back system to prevent freezing of solar collector's in winter and boiling in
In self-draining solar devices, solar collectors are protected from damage due to the fact that there is complete drainage when the circulation pump stops in both winter and summer seasons. However, certain solutions of self-draining solar devices, which are widely used in world practice, include excessive consumption of electricity to circulate the heat carrier,
Stagna
summer
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hydraulic shocks when circulating pumps stop, low reliability and large loss of temperature potential in intermediate heat exchangers.
Self-draining solar devices are relatively energy-efficient and reliable self-draining solar devices with a simple single-circuit high-power solar system that reduces electricity consumption by 60%, eliminates hydraulic shocks when circulating pumps stop and increases thermal efficiency by 20%. focused on output and implementation.
Self-draining solar devices are related to the priorities of scientific research in the country and government programs or research plans.
These self-draining solar devices correspond to the priority direction of the development of science and technology of the Republic "Development of the use of renewable energy sources."
There are 4 main methods to protect solar collectors from damage: drainage, use of antifreeze, electric heating, use of slow circulation were analyzed, advantages and disadvantages were identified and one was chosen for improvement: use of venturi pipe in solar devices for self-drainage method.
Scientific research on the theoretical and practical aspects of the conversion of solar energy into heat using flat solar collectors for water heating is being carried out in the world's leading research centers and universities.
The computational-theoretical and experimental results on the use in solar heat supply systems performed by D.A.Daffy, U.A.Beckman in the Solar Energy Laboratory of the University of Wisconsin, USA are of great importance in this field. These created solar devices are used today in many scientific, practical and design centers around the world[3].
The Swiss Institute of Solar Technology and the National Solar Energy Center of India conduct certification tests of solar collectors developed in different countries around the world.
In the Laboratory of Renewable Energy Sources and Energy Saving of the Joint Institute of High Temperatures (OIVTAN) of the Russian Academy of Sciences, under the leadership of O.S. Popel, generations of heat-resistant plastics were created and their heat test methods were improved. Currently, 16 leading companies around the world are producing self-draining solar systems.
References
1. Sharif Karshiev Sherkulovich, "Improving Efficiency of Solar Heating Systems with Flat Solar Collectors : Key Reserves and Possible Ways of Their Implementation," Impact Factor 6.1 . Int. J. Adv. Res. Sci. Eng. Technol. Vol. 6, Issue 8 , August 2019.ISSN 2350-0328, vol. 6, no. 8, pp. 10361-10364, 2019. http://www.ijarset.com/upload/2019/august/08-usovoxaus-20.pdf
2. Sharif Karshiev Sherkulovich, "Solar Collector's Development Drain Back Systems" Impact Factor 5.7Int. J. Agric. Res. ISSN N02236-6124 Vol. IX, Issue IX, Sept., vol. 5,7, no. 9, pp. 229-233, 2020. http://www.ijrpublisher.com/V0LUME-9-ISSUE-9-SEPTEMBER-2020/
3. Sharif Karshiev Sherkulovich, "Devices For Protecting Modern Solar Collectors," Universum технические науки научный журнал. - № 9(78). ISSN 2311-5122 Москва 2020, vol. 6, no. 7, pp. 96-99, 2020. http://7universum.com/ru/tech/archive/category/978
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