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首页> 外文期刊>International journal of energy research >Computational energy analysis of an innovative isothermal chamber for testing of the special equipment used in the transport of perishable products
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Computational energy analysis of an innovative isothermal chamber for testing of the special equipment used in the transport of perishable products

机译：创新的恒温箱的计算能量分析，用于测试易腐产品运输中使用的特殊设备

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摘要

This paper describes an improved numerical simulation study of an isothermal chamber recently constructed at Zografou Campus of the National Technical University of Athens (NTUA) for the testing of special equipment used for transporting perishable foodstuffs in accordance with the United Nations ATP agreement. Using a transient finite difference model, a simulation is developed for a modern ATP test chamber and a typical specimen refrigerated vehicle to be tested, The simulation results are compared to experimental measurements taken under real conditions by a data acquisition system and a refrigerated semitrailer as specimen. Proportional-integral control is employed for the regulation of the cooling and heating system. The impact of various parameters on the time required to reach the set-point temperature (t{sub}(set)) is investigated and the energy consumption is simulated for a period of 22 h. In particular, the impact of specimen insulation thickness and the thickness of the chamber insulation floor are considered in detail. The total energy consumption increases by approximately 16% when the concrete floor layer thickness is increased from 8 to 16cm for typical initial conditions and desired chamber and specimen temperatures of 32.5 and 7.5℃, respectively. Using a floor insulation of 6cm extruded heavy strain-resistant polystyrene reduces the energy consumption by at least 13%. Specimen insulation thickness increase from U-value of 0.35 Wm{sup}(-2)K to 0.75 Wm{sup}(-2)K result to an increase in energy consumption by a percentage of 28%, Thermal capacity, temperature of car body and specimen dimensions are also treated as variables that affect the total duration of an ATP test and its total energy consumption.
机译：本文描述了最近在雅典国立技术大学（NTUA）的祖格拉夫校区建造的等温室的改进的数值模拟研究，该室用于根据联合国ATP协议测试用于运输易腐烂食品的特殊设备。使用瞬态有限差分模型，针对现代ATP测试箱和典型的要测试的冷藏样品车进行了仿真，并将仿真结果与数据采集系统和冷藏半挂车作为样品在真实条件下进行的实验测量结果进行了比较。比例积分控制用于冷却和加热系统的调节。研究了各种参数对达到设定温度（t {sub}（set））所需时间的影响，并模拟了22 h的能耗。特别是，详细考虑了样品绝缘层厚度和腔室绝缘层厚度的影响。在典型的初始条件以及所需的试验箱和样品温度分别为32.5和7.5℃的情况下，将混凝土地板的厚度从8cm增加到16cm时，总能耗将增加约16％。使用6厘米厚的地板绝缘材料挤出的抗应变重型聚苯乙烯可减少至少13％的能耗。样品绝缘厚度从0.35 Wm {sup}（-2）K的U值增加到0.75 Wm {sup}（-2）K的U值导致能源消耗增加28％，热容量，汽车温度车身和样品的尺寸也被视为影响ATP测试总持续时间及其总能量消耗的变量。

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