Yuta Miyoshi, K. Hidaka, T. Okayasu, D. Yasutake, M. Kitano
{"title":"恒温层在温室作物局部环境节能控制中的应用2。冬季草莓栽培的应用","authors":"Yuta Miyoshi, K. Hidaka, T. Okayasu, D. Yasutake, M. Kitano","doi":"10.2525/ECB.55.37","DOIUrl":null,"url":null,"abstract":"Greenhouse strawberry production is often limited by temperature and low solar radiation during the cold season, which depress photosynthesis in strawberry crops and by excessively high temperature during the warm season, which causes a delay in flower-bud differentiation (Sone et al., 2005; Dan et al., 2007; Hidaka et al., 2013). Furthermore, the steep increase in the price of oil has threatened the income during winter season, because this season requires a greater magnitude of greenhouse heating (Okimura, 2009). For stable year-round production of strawberry crops to maintain high profitability and sustainability, it is essential to establish a system for energy-saving and year-round environmental control by applying renewable energy resources. The constant soil temperature layer is an underground, widely occurring, and easily accessible renewable energy resource (Yamamoto, 1966; 1973; 1985; Takaura and Yamanaka, 1981). However, because of the low capacity of soil for heat storage and conduction, heat exchange with the constant soil temperature layer has been considered insufficient for controlling the temperature of the entire volume of air inside a greenhouse (Takami and Uchijima, 1977). To solve these problems in the greenhouse system, in our previous study (Miyoshi et al., 2013), we proposed a novel local environmental control system that related the constant soil temperature layer to the circulation of air and heat exchange between the soil and ambient air of strawberry crops. We examined the short-term performance of this system from the viewpoint of energy savings via the control of air conditions. The system enabled energysaving local control of the ambient air temperature and relative humidity of strawberry crops via heat exchange with the constant soil temperature layer, demonstrating a 50% reduction in the heating load for the ambient air of crops. The aim of the present study was to apply the system developed in our previous study to the elevated bed system of strawberry crops during the cold, winter season, and to examine the long-term effect of the system on energy-saving control of air condition and crop yield.","PeriodicalId":11762,"journal":{"name":"Environmental Control in Biology","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Application of the constant soil temperature layer for energy-saving control in the local environment of greenhouse crops II. 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引用次数: 1
摘要
温室草莓生产往往受到寒冷季节温度和低太阳辐射的限制,这会抑制草莓作物的光合作用,而温暖季节温度过高会导致花芽分化延迟(Sone等,2005;Dan et al., 2007;Hidaka et al., 2013)。此外,石油价格的急剧上涨已经威胁到冬季的收入,因为这个季节需要更大程度的温室供暖(Okimura, 2009)。为了使草莓作物全年稳定生产,保持较高的盈利能力和可持续性,必须建立一套利用可再生能源的节能和全年环境控制体系。恒定地温层是一种地下的、广泛存在的、容易获得的可再生能源(Yamamoto, 1966;1973;1985;Takaura and Yamanaka, 1981)。然而,由于土壤的蓄热和导热能力较低,与土壤恒温层的热交换被认为不足以控制温室内整个空气体积的温度(Takami和Uchijima, 1977)。为了解决温室系统中的这些问题,在我们之前的研究中(Miyoshi et al., 2013),我们提出了一种新颖的局部环境控制系统,将土壤恒温层与草莓作物的空气循环和土壤与环境空气之间的热交换联系起来。我们从控制空气条件节约能源的角度考察了该系统的短期性能。该系统通过与恒定土壤温度层的热交换,实现了草莓作物环境空气温度和相对湿度的节能局部控制,表明作物环境空气的热负荷减少了50%。本研究的目的是将本研究开发的系统应用于寒冷冬季草莓作物高架床系统,并研究该系统对空调节能控制和作物产量的长期影响。
Application of the constant soil temperature layer for energy-saving control in the local environment of greenhouse crops II. Application to strawberry cultivation during the winter season
Greenhouse strawberry production is often limited by temperature and low solar radiation during the cold season, which depress photosynthesis in strawberry crops and by excessively high temperature during the warm season, which causes a delay in flower-bud differentiation (Sone et al., 2005; Dan et al., 2007; Hidaka et al., 2013). Furthermore, the steep increase in the price of oil has threatened the income during winter season, because this season requires a greater magnitude of greenhouse heating (Okimura, 2009). For stable year-round production of strawberry crops to maintain high profitability and sustainability, it is essential to establish a system for energy-saving and year-round environmental control by applying renewable energy resources. The constant soil temperature layer is an underground, widely occurring, and easily accessible renewable energy resource (Yamamoto, 1966; 1973; 1985; Takaura and Yamanaka, 1981). However, because of the low capacity of soil for heat storage and conduction, heat exchange with the constant soil temperature layer has been considered insufficient for controlling the temperature of the entire volume of air inside a greenhouse (Takami and Uchijima, 1977). To solve these problems in the greenhouse system, in our previous study (Miyoshi et al., 2013), we proposed a novel local environmental control system that related the constant soil temperature layer to the circulation of air and heat exchange between the soil and ambient air of strawberry crops. We examined the short-term performance of this system from the viewpoint of energy savings via the control of air conditions. The system enabled energysaving local control of the ambient air temperature and relative humidity of strawberry crops via heat exchange with the constant soil temperature layer, demonstrating a 50% reduction in the heating load for the ambient air of crops. The aim of the present study was to apply the system developed in our previous study to the elevated bed system of strawberry crops during the cold, winter season, and to examine the long-term effect of the system on energy-saving control of air condition and crop yield.