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Simulation of a predominantly passive natural air cooling system

机译：模拟主要被动天然空气冷却系统

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Climate control is an everyday challenge. With the rapid surge in electricity prices over the past few years, air conditioning operating expenses necessarily increased. The effects, furthermore, of global warming result in increased cooling, and therefore, energy demand. The purpose of this paper is to propose two models that simulate a natural air cooling system. The first model simulates cooling through an earth to air heat exchanger, utilising the soil as a heat sink. The second model simulates the transient cooling of a control volume, which receives cooled air and is open to the environment. A scale model of an earth-to-air heat exchanger system was designed, constructed and used to verify results from the proposed models. Following verification, a real-life size heat exchanger was simulated in order to cool down a room of 60 m3within one hour, using only the underground soil as a heat sink. Results showed that a room at an initial 30 °C can be cooled down to 20.5 °C with a 1.2 m underground heat exchanger and down to 17.8 °C if the length is increased to 2.0 m. Only fan power is needed to increase the air's dynamic pressure, resulting in flow conditions. As a result a coefficient of performance between 60 and 80 can be achieved.
机译：气候控制是一个日常挑战。随着过去几年的电力价格迅速，空调运营费用必然会增加。此外，全球变暖的影响导致冷却增加，因此能源需求增加。本文的目的是提出两种模拟天然空气冷却系统的型号。第一种模型模拟通过地球冷却到空气热交换器，利用土壤作为散热器。第二种模型模拟控制体积的瞬态冷却，该控制量接收冷却的空气并对环境开放。设计，构造并用于验证所提出的模型的结果，设计了地球到空中热交换器系统的比例模型。验证后，模拟了真实尺寸的热交换器，以便冷却到60米的房间 3 在一小时内，仅使用地下土壤作为散热器。结果表明，初始30°C的房间可以用1.2米的地下热交换器冷却至20.5°C，如果长度增加到2.0米，下降至17.8°C。只需要风扇功率来增加空气的动态压力，导致流动条件。结果，可以实现60和80之间的性能系数。

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