【摘要】：地源熱泵系統(tǒng)是一種高效節(jié)能的空調(diào)系統(tǒng)，具有良好的發(fā)展前景。在以武漢為典型城市的冷負(fù)荷占優(yōu)地區(qū)，由于冷熱負(fù)荷比較大，且制冷季比供熱季長(zhǎng)，普通的土壤熱泵系統(tǒng)的使用容易產(chǎn)生土壤熱積累問題，故一般采用以冷卻塔為輔助散熱設(shè)備的混合式土壤源熱泵系統(tǒng)來解決該問題。 在實(shí)際工程中，由于設(shè)計(jì)、施工、土壤自身恢復(fù)能力等原因，導(dǎo)致混合式土壤源熱泵系統(tǒng)土壤熱積累的問題依然存在。因此，我們有必要對(duì)混合式土壤源熱泵系統(tǒng)進(jìn)行優(yōu)化設(shè)計(jì)，其中，優(yōu)化冷卻塔的控制策略是改善混合式土壤源熱泵系統(tǒng)運(yùn)行效率和土壤熱積累問題的重要手段。 本文以武漢地區(qū)某辦公樓建筑為研究對(duì)象，利用TRNSYS對(duì)其采用的混合式土壤源熱泵系統(tǒng)冷卻塔的控制策略進(jìn)行模擬研究，對(duì)比了溫差控制和基于此控制的夜間開啟冷卻塔與地埋管串聯(lián)為土壤降溫的控制策略，并在上述兩種控制的基礎(chǔ)上，提出對(duì)夜間開啟冷卻塔的時(shí)間采取某種溫差控制，即當(dāng)板式換熱器的地埋管側(cè)與冷卻塔側(cè)水溫差值低于某設(shè)定值時(shí)，，關(guān)閉冷卻塔和水泵，防止熱量由冷卻塔通過板式換熱器帶入地埋管側(cè)。 模擬結(jié)果表明，夜間開啟冷卻塔可以緩解土壤熱積累問題，但開啟時(shí)間決定了系統(tǒng)的節(jié)能與否；對(duì)夜間冷卻塔的開啟采取某種溫差控制時(shí)，可以進(jìn)一步緩解土壤熱積累問題，系統(tǒng)更節(jié)能，并且運(yùn)行費(fèi)用最低。本文的結(jié)論對(duì)混合式土壤源熱泵系統(tǒng)在實(shí)際工程中的應(yīng)用具有一定參考價(jià)值。
[Abstract]:Ground-source heat pump system is a high-efficiency energy-saving air-conditioning system, and has a good development prospects. In the predominance of cold load in Wuhan as a typical city, because the cold and heat load is relatively large and the refrigeration season is longer than the heating season, the common ground heat pump system is easy to produce the problem of soil heat accumulation. Therefore, a hybrid ground source heat pump system with cooling tower as auxiliary cooling equipment is used to solve this problem. In practical engineering, the problems of soil heat accumulation in hybrid ground source heat pump system still exist due to the design, construction and soil recovery ability. Therefore, it is necessary to optimize the design of hybrid ground-source heat pump system. Among them, optimizing the control strategy of cooling tower is an important means to improve the operational efficiency and soil heat accumulation of hybrid ground-source heat pump system. In this paper, the control strategy of the cooling tower of the hybrid ground source heat pump system is simulated by using TRNSYS in an office building in Wuhan area. This paper compares the control strategy of temperature difference control with that of open cooling tower and buried pipe in series for soil cooling based on this control. On the basis of the above two kinds of control, some temperature difference control for the time of opening cooling tower at night is put forward. That is, when the water temperature difference between the underground tube side of the plate heat exchanger and the side of the cooling tower is lower than a certain set value, the cooling tower and water pump are closed to prevent the heat from the cooling tower passing through the plate heat exchanger into the underground tube side. The simulation results show that the nocturnal open cooling tower can alleviate the problem of soil heat accumulation, but the opening time determines the energy saving of the system, and when some temperature difference control is adopted for the opening of the night cooling tower, the problem of soil thermal accumulation can be further alleviated. The system is more energy efficient and runs at the lowest cost. The conclusion of this paper has certain reference value for the application of hybrid ground source heat pump system in practical engineering.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU831

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本文編號(hào)：2244514