Preparation and energy-saving effects of disodium hydrogen phosphate dodecahydrate composite phase-change material applied in greenhouse cooling

doi:10.19799/j.cnki.2095-4239.2023.0483

Abstract

Abstract:

Greenhouses exploit the principle of greenhouse effect to maintain an optimal growth environment for plants. Under intense sunlight, the temperature inside greenhouses may exceed a suitable growth temperature; therefore, appropriate cooling measures must be implemented. In this study, phase-change energy storage technology is applied to greenhouses by exploiting passive temperature control to reduce the peak temperature of the greenhouse and thereby reduce energy consumption. Disodium hydrogen phosphate dodecahydrate (DHPD) was used as the phase change material (PCM). After the addition of nucleating agents and thickeners, a composite PCM was prepared, which exhibited a low supercooling degree and good cycle stability. Its performance was evaluated using the step-cooling curve method, differential scanning calorimetry, and a simultaneous thermal analyzer. Next, the composite PCM was packaged into panels and installed in a greenhouse, and the impact of the phase-change panels on the thermal environment inside the greenhouse under actual sunlight conditions was investigated. The results revealed that sodium metasilicate nonahydrate with a mass fraction of 4% can reduce the supercooling of DHPD from 12 ℃ to 0.5 ℃. Using xanthan gum with a mass fraction of 5% as the thickener, the composite PCM exhibited good cycle stability. The phase change temperature and latent heat of the prepared composite were 34.2 ℃ and 194.5 J/g, respectively, which were found to be suitable for greenhouses. Continuous 24 h temperature detection revealed that the peak temperature of the greenhouse was reduced by 3.5 ℃ in comparison with that of the reference greenhouse without phase change panels. The corresponding peak time was delayed by 32 min. In addition, the total duration of high temperature was significantly shortened in compared to that of the reference. Therefore, the application of the DHPD composite PCM in greenhouses can improve the high-temperature environment of the greenhouse and reduce the energy consumption of cooling.

Key words: greenhouse, phase change material, disodium hydrogen phosphate dodecahydrate, cooling energy consumption

CLC Number:

TK 02

Qiangqiang XIAO, Jiakang SUN, Hongda TANG, Linhua ZHANG, Nairen DIAO, Hui LI. Preparation and energy-saving effects of disodium hydrogen phosphate dodecahydrate composite phase-change material applied in greenhouse cooling[J]. Energy Storage Science and Technology, 2023, 12(12): 3635-3642.

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OSB位置	尺寸	数量
底板	1000 mm×500 mm×14 mm	1
矩形侧板	1000 mm×486 mm×14 mm	1
扇形侧板	1/4圆柱体，半径486 mm，高14 mm	2

样品	质量分数/%	熔化温度/℃	潜热/(J/g)
DHPD	100	35.0	250.7
DHPD/SMN	96.0	34.1	230.4
DHPD/SMN/XG	91.2	34.2	194.5

测温位置	大棚种类	峰值时间 (HH∶MM)	峰值温度/℃	峰温差/℃	温度迟滞/min
墙壁温度	参考大棚	12∶12	57.7	5.9	120
墙壁温度	相变大棚	14∶12	51.8	5.9	120
中心温度	参考大棚	12∶16	54.2	3.5	32
中心温度	相变大棚	12∶48	50.7	3.5	32

大棚类型	时间/min
大棚类型	>40 ℃	>45 ℃	>50 ℃
参考大棚	497	393	250
相变大棚	486	333	118

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