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首页> 外文期刊>Acta Horticulturae >Estimation of the energy consumption of electrical wire heating in sand substrates according to the target root zone temperature.
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Estimation of the energy consumption of electrical wire heating in sand substrates according to the target root zone temperature.

机译：根据目标根区温度估算砂土中电线加热的能耗。

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摘要

Heat transfer processes occurring in greenhouse cultivation substrates are very complex due to the high number of environmental and soil factors involved. Few estimation methods allow establishing the energy consumption of the heating elements as a function of the design parameters (depth and spacing) and of environmental and cultivation criteria, such as the ambient temperature and the target root zone temperature suitable for plant development. The objective of this work is to analyze the influence of the target root temperature on the energy consumption of six configurations of soil heating system: 150, 225 and 300 mm depth with 100 and 150 mm spacings. An experimental test was arranged to measure ambient and root temperatures and operation times of the electrical heating cables. Dimensional analysis was applied to data obtained experimentally to relate all the involved variables: thermal properties of the substrates, depth, spacing, power and operation time of the heating cable, daily mean values of the measured temperatures. The obtained expressions permitted to quantify the energy consumption. An increase in target temperature in the root zone brings about increases in daily energy demand. An increase in air temperature brings about a decrease in energy requirements, but the slope of the curves increases as a function of target temperature. At a fixed heating cable depth, energy consumption is always higher for 100 mm cable spacing than for 150 mm spacing, and the differences become larger for shallower heating cable installation depths. The heating system with the cable installed at 150 mm spacing and 150 mm depth obtains the lowest energy consumption value, while the configuration with the cable installed at 100 mm spacing and 150 mm depth, and the configurations with the cable buried at 225 mm depth require the highest consumption.
机译：由于涉及大量的环境和土壤因素，温室栽培基质中发生的传热过程非常复杂。很少有估算方法能够根据设计参数（深度和间距）以及环境和栽培标准（例如环境温度和适合植物生长的目标根区温度）确定加热元件的能耗。这项工作的目的是分析目标根温度对土壤加热系统的六种配置（深度为150、225和300 mm，间距为100和150 mm）的能耗的影响。安排了一项实验测试，以测量环境温度和根部温度以及电加热电缆的工作时间。将尺寸分析应用于通过实验获得的数据，以关联所有涉及的变量：基板的热性能，深度，间距，加热电缆的功率和工作时间，所测温度的每日平均值。所获得的表达式允许量化能量消耗。根区目标温度的升高导致每日能量需求的增加。空气温度的升高导致能量需求的降低，但是曲线的斜率随着目标温度的升高而增加。在固定加热电缆深度的情况下，电缆间距为100 mm的能耗总是比150 mm间距的能耗高，对于较浅的加热电缆安装深度，能耗会更大。以150 mm间距和150 mm深度安装电缆的加热系统获得最低的能耗值，而以100 mm间距和150 mm深度安装电缆的配置以及埋在225 mm深度的电缆的配置要求最低。最高的消费。

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