Abstract
An increasing amount of sunlight is available to sunken greenhouses located in northern China, but it remains unclear how the indoor temperature changes at different heights and at the north and south ends of the structure. To study how the temperature in a single indoor section, at multiple points, varies in a sunken solar greenhouse, 10 measurement lines were arranged in a section 30 m from the west wall. Each line was equipped with a corresponding WT-59 wireless sensor. Temperature and humidity data were collected from 8 March 2019 to 26 December 2019. The following results were obtained. (1) The indoor temperature variation in a day could be divided into four stages: from 0:00 to 7:30 h, the temperature at all measurement points decreased linearly; from 7:30 to 14:30 h, the temperature at all measurement points increased curvilinearly; from 14:30 to 18:00, the temperature at all measurement points decreased curvilinearly; and from 18:30 to 24:00, the temperature at all measurements points decreased linearly. (2) The maximum temperature on sunny days in the greenhouse was higher than that on cloudy days and snowy days, but the maximum temperature on cloudy days and snowy days in the greenhouse occurred 3 h earlier than on sunny days. (3) The lowest average temperature of a sunken solar greenhouse over 3–6 months was 7.5ଌ, without heating. The research results provide theoretical and reference data on how the temperature changes in the interior of a solar greenhouse and inform about the three-dimensional planting height and ventilation times.
Highlights
A solar greenhouse is a high-efficiency, energy-saving gardening facility with Chinese characteristics
(1) The indoor temperature variation in a day could be divided into four stages: from 0:00 to 7:30 h, the temperature at all measurement points decreased linearly; from 7:30 to 14:30 h, the temperature at all measurement points increased curvilinearly; from 14:30 to 18:00, the temperature at all measurement points decreased curvilinearly; and from 18:30 to 24:00, the temperature at all measurements points decreased linearly
It is a kind of energy-efficient greenhouse structure and plays a significant role in the facility gardening industry in northern China (Bao et al, 2018 b; Chen, 2008; Zhang, 2015)
Summary
A solar greenhouse is a high-efficiency, energy-saving gardening facility with Chinese characteristics. It is a kind of energy-efficient greenhouse structure and plays a significant role in the facility gardening industry in northern China (Bao et al, 2018 b; Chen, 2008; Zhang, 2015). The main goal of the soil wall is to improve the minimum temperature of the sunken solar greenhouse at night, so it is crucial to study the temperature variation in different areas of the structure over time. There is limited research on sunken solar greenhouses with a soil wall in China and throughout the world (Zhang et al, 2012)
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