THERMAL SCIENCE

International Scientific Journal

Jianan Wang

,

Fengjie Wei

,

Weidong Duan

,

Yonghui Zhang

,

Yikuan Fan

,

Zhaopeng Song

PERFORMANCE OF SOLAR HOT-WATER INSTALLATIONS FROM ROOF-CONSTRUCTED SOLAR COLLECTORS INTEGRATED WITH A CENTRAL HEATING SUPPLY FOR TOBACCO CURING

ABSTRACT
In view of the abundant solar energy available during the tobacco curing season, a solar hot-water installation to provide auxiliary heating for bulk tobacco-curing operations was developed, based on the original concept of a boiler-driven central heating supply that transported hot water over short distances by pipeline, using solar collectors connected in parallel and installed on the unoccupied flat roofs of 20 curing barns. The results showed that daily solar conversion efficiency ranged from 65% to 67%. During the tobacco curing period from 10:00 hours to 14:00 hours each day, in sunny or partly cloudy weather, heating water temperatures exceeding 75°C were automatically derived for use in the bulk curing barns needed. Use of solar energy as a substitute for coal fuel in tobacco curing, in conjunction with precise automatic control, enabled solar energy to account for 18.4% of the total curing energy consumption in this study. Through comparative analysis, the use of solar hot-water installations can help the local tobacco industry to reduce absolute carbon emissions by more than 10% at the experimental location in the pay-back period.
KEYWORDS
agriculture drying, auxiliary heating energy, bulk curing barn, heat exchanger, dry- and wet-bulb temperatures
PAPER SUBMITTED: 2019-04-06
PAPER REVISED: 2019-08-19
PAPER ACCEPTED: 2019-09-05
PUBLISHED ONLINE: 2020-02-15
DOI REFERENCE: https://doi.org/10.2298/TSCI190406072W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 3, PAGES [1845 - 1852]
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Performance of solar hot-water installations from roof-constructed solar collectors integrated with a central heating supply for tobacco curing

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence