Improving the energy efficiency of a solar air heater with a heat exchanger – accumulator

Abstract

The authors of the work presented developed solar air-heater with a spiral heat exchanger-accumulator based on their developed scheme. The article discusses a result of experimental studies, the high energy efficiency of a solar air-heater with a spiral heat exchanger-accumulator in the mode of medium heating of heat carriers in the natural and climatic conditions of Karshi. In July 2021, the maximum level of solar radiation was recorded for the entire experimental and research period. This article shows that the maximum air temperature rose to 78 °C due to the use of oil to collect heat in the SAH and that hot air was supplied to the consumer during the day. As a result of experimental studies, the main experimental designs and modes of operation of the solar air heater with a spiral heat exchanger-accumulator were substantiated.

Results of the study of rotary feed pump with separator and screw feeder

“…This is explained by the fact that low-humidity feed mixtures have fairly high viscoplastic properties, which lead to a decrease in the speed in the suction line by 3...4 times. In this case, the feed mixture does not have time to fill the working chamber of the pump, and therefore the efficiency decreases and pump delivery [11][12][13][14][15][16].…”

The dependence of the amount of energy obtained by solar cells on the temperature of the environment

“…In the passport characteristics of the solar cells used in practice, the index values suitable for the Mediterranean climatic conditions are given. [8][9][10][11][12][13][14]. The standard conditions are the ambient temperature of 25 ℃ and solar radiation of 1000 W/m².…”

Progressive methods of alkaline refining and bleaching of cottonseed oil

“… Humidity of vegetable oils was determined by weight method [8].  Content of phospholipids was determined according to the method [9]  The content of gossypol was determined according to the method [10].  Oil absorption of adsorbents was determined according to the procedure [11].…”