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唐伊恋,李明,马逊,Reda Hassanien Emam.草莓温室太阳能热泵系统阶梯式供暖特性[J].农业工程学报,2018,34(13):239-245.DOI:10.11975/j.issn.1002-6819.2018.13.029
草莓温室太阳能热泵系统阶梯式供暖特性
投稿时间:2017-11-30  修订日期:2018-03-21
中文关键词:  太阳能  热泵  温室  草莓  阶梯式供暖
基金项目:西南地区可再生能源研究与开发协同创新中心(05300205020516009),中国-老挝可再生能源开发与利用联合实验室(2015DFA60120),云南省周国富专家工作站(2017IC011)。
作者单位
唐伊恋 1. 云南师范大学太阳能研究所昆明 650500
 
李明 1. 云南师范大学太阳能研究所昆明 650500
 
马逊 1. 云南师范大学太阳能研究所昆明 650500
 
Reda Hassanien Emam 1. 云南师范大学太阳能研究所昆明 650500
2. 开罗大学农业学院农业工程系开罗 12613
 
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中文摘要:运用太阳能热泵系统为草莓温室供暖,能有效提升草莓的产量和品质。为探究温室内立体栽培的供暖特性,以及相匹配的太阳能热泵系统的供暖系数(coefficient of performance, COP),该文设计并搭建了太阳能热泵阶梯式供暖系统。以"京藏香"草莓为试材,分析了距离地面0.5、1.0、1.5及2.0 m不同阶梯高度的空间温度,对比了阶梯式供暖的太阳能温室和未供暖的普通温室内的草莓品质及产量。结果表明,在北亚热带低纬高原山地季风气候地区,冬季采用太阳能热泵系统为温室供暖的COP值在3.02~5.15之间。在太阳能温室内种植的草莓产量是普通温室产量的1.56倍,可溶性固形物含量的平均值达10.5%。在太阳能热泵系统阶梯式供暖的温室中,距离地面1.0~1.5 m高度范围内的供暖效果较好,且放置于1.0 m阶梯上的草莓与其他高度的草莓相比,产量最高品质最优,其单果最大值为32.3 g,可溶性固形物含量为12.5%,因此,采用阶梯式供暖的温室中,距离地面1.0 m高度的温度更适宜草莓生长需求。
Tang Yilian,Li Ming,Ma Xun,Reda Hassanien Emam.Stair-heating characteristics of solar heat pump system in strawberry greenhouse[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(13):239-245.DOI:10.11975/j.issn.1002-6819.2018.13.029
Stair-heating characteristics of solar heat pump system in strawberry greenhouse
Author NameAffiliation
Tang Yilian 1. Solar Energy Research Institute, Yunnan Normal University, Kunming 650500, China
 
Li Ming 1. Solar Energy Research Institute, Yunnan Normal University, Kunming 650500, China
 
Ma Xun 1. Solar Energy Research Institute, Yunnan Normal University, Kunming 650500, China
 
Reda Hassanien Emam 1. Solar Energy Research Institute, Yunnan Normal University, Kunming 650500, China
2. Agricultural Engineering Department, Faculty of Agriculture, Cairo University, Cairo 12613, Egypt
 
Key words:solar energy, heat pump, greenhouse, strawberry, stair-heating
Abstract:Greenhouse cultivation can provide a good planting environment for strawberry growth. Using solar heat pump system to heat strawberry greenhouse in winter can not only utilize new energy effectively, but also encourage strawberries to be marketed early and increase their yield and quality. Stereoscopic planting in greenhouse can improve the utilization of space. In order to explore the optimal height of the multistoried heating in the greenhouse, and to match the coefficient of performance (COP) values of the solar heat pump system, a stair-heating mode was designed in this paper. Two greenhouses with the same size were built in Yunnan Normal University, with 20 strawberry plants grown in each greenhouse, using the "Jingzangxiang" strawberry variety as experimental material. One of the greenhouses was heated by solar heat pump system, which consisted of evacuated tube solar collector, heat pump, water tank and stair-heating system, another one was normal greenhouse without heating system. Strawberries were planted in potted substrates, and the strawberry pots were placed on the steps in the solar greenhouse, while the other strawberry pots were placed on the ground in the normal greenhouse. In this experiment, the temperature and humidity in two greenhouses were analyzed. The temperatures in solar greenhouse in sunny and cloudy days were analyzed separately. In the solar greenhouse, the air temperatures were measured at the height of 0.5, 1.0, 1.5 and 2.0 m above the ground, and the temperature measurements were carried out separately in sunny days and cloudy days. Furthermore, the quality and yield of strawberry were also compared in the solar greenhouse with stair-heating and the normal greenhouse. In addition, the COP values of the solar heat pump system were measured in sunny days and cloudy days. The results showed that the COP value of solar heat pump system was between 3.02-5.15 in winter in the monsoon climate area of the northern subtropical low latitude plateau. When the weather was sunny, the temperature curves at different spatial altitudes were also different because of the influence of solar radiation. The maximum air temperature at 2.0 m in heated greenhouse was as high as 40.4 ℃ in sunny days, which exceeded the temperature range required for strawberry growth, and the maximum air temperature at the height of 1.0 and 1.5 m was 31.6 and 34.2 ℃, respectively, which were within the temperature range required for strawberry growth. The highest night-time heating efficiency was located at 1.5 m. When the average ambient temperature was 8.4 ℃ in cloudy day, the daily average air temperature ranges of 1.0 and 1.5 m were 14.1 and 16.9 ℃ in solar greenhouse. In the case of the same COP value provided by the heating system, the stair- heating characteristics of the solar greenhouse showed that heating at heights of 1.0 m to 1.5 m from the ground could obtain a temperature environment with a daily average air temperature of 15 ℃, and the heating effect was good. Strawberry production in solar greenhouse was 1.56 times higher than that in normal greenhouses. The average soluble solids content of strawberries grown in solar greenhouse was 10.5% which was higher than that in normal greenhouse. Therefore, the yield and quality of strawberries grown in solar greenhouse are higher than those in normal greenhouse. In addition, In addition, the yield and quality of strawberry located at the 1.0 m stair was best with the maximum of the single fruit being 32.3 g and the soluble solid content being 12.5%. In general, when 55 ℃ water circulating cascade heating system is used, the temperature in the heights range of 1 to 1.5 m from the ground is more suitable for strawberry growth.
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