Substantiation of parameters and operational modes of air solar collector
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 3, Issue 8
Abstract
<p>We developed a new design of an air solar collector for a fruit dryer including double glazing and a selective surface made of a thin metal substrate with inlet and outlet openings on its bottom. We established that it is necessary to use a glass with a heat-reflecting coating of a solid K-glass type with a radiation coefficient ε=0.1...0.15 for a double-glazing substrate. This makes it possible to obtain the widest possible spectrum of direct sunlight rays that irradiate a surface of an absorbing plate and reduces a diffuse component of radiation, which ensures an increase in efficiency of a solar collector.</p><p>We determined regularities of the influence of a change in flow speed of a heat-transfer agent, a temperature drop, and radiation intensity on power of a solar collector. We developed a model of heat exchange processes occurring in an air solar collector. We presented the methodology for estimation of heat loss of an air solar collector with passive use of solar energy.</p><p>We established that energy illumination E, which is from 377 to 1,223 W/m<sup>2</sup>, affects heat output of an air collector Q=117...480 W significantly. We established that a use of a non-selective absorbing surface in an air solar collector with a low insolation level E=377 W/m<sup>2</sup> makes it possible to increase efficiency by η=70.7 % more for selective, and at a large energy illumination of E=1,000 W/m<sup>2</sup>, on the contrary small η=54.6 %. This makes it possible to explain how redistribution of the ratio of the maximum current thermal power (N<sub>SC</sub>=48.8...100 W) and efficiency of an air solar collector occurs.</p><p>One can use the obtained results in development and improvement of technical means for fruit drying to improve technological and energy efficiency of the process.</p>
Authors and Affiliations
Serhiy Korobka, Mykhailo Babych, Roman Krygul, Andriy Zdobytskyj
Keywords
Related Articles
- EP ID EP528003
- DOI 10.15587/1729-4061.2018.132090
- Views 56
- Downloads 0
Mathematical model of the reverse water postpurification at mining enterprises when using electromagnetic focusing of contaminants
This study addresses the post-purification of reverse water by the electromagnetic focusing of charged particles in contaminants of polychlorinated biphenyls at mining enterprises. We established functional dependences o...
Theoretical and applied aspects of using a thermal pump effect in gas pipeline systems
<p class="a">Based on the classical method for calculating parameters of gas pipelines using electrohydraulic analogy, a mathematical model of the object, the process of gas transmission in an industrial pipeline, has be...
Using Markov chains for predicting collective motivation of students.
Predicting students' motivation hot topic for research in higher education. In previous work had created a comprehensive model for evaluating students' motivation. As part of the floor is the algorithm of the forecast av...
Development and investigation of protective properties of the electromagnetic and soundproofing screen
<p>We have developed a technology for manufacturing an universal electromagnetic and soundproofing screen based on foam-latex and foam-polystyrene. The dispersity and physical characteristics of components in a material...
Substantiation of the mechanism of interaction between biopolymers of ryeandwheat flour and the nanoparticles of the magnetofооd food additive in order to improve moistureretaining capacity of dough
<p class="a">The mechanism of influence of the Magnetofood additive on the moisture retaining in rye-and-wheat dough of various acidities was established. In a neutral medium, solvated Magnetofood nanoparticles are forme...