本文關(guān)鍵詞： 雙冷源新風(fēng)機組 運行策略 仿真 負荷比例 排風(fēng)熱回收　出處：《東南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：傳統(tǒng)空調(diào)系統(tǒng)中夏季室內(nèi)熱濕負荷由單一冷源承擔,造成熱濕聯(lián)合處理的能量損失、熱濕比不匹配和室內(nèi)空氣品質(zhì)不佳等問題。而溫濕度獨立控制空調(diào)系統(tǒng)越來越廣泛地被用于民用建筑和工業(yè)建筑中,該空調(diào)系統(tǒng)中的新風(fēng)系統(tǒng)承擔著室內(nèi)全部濕負荷。因此有必要研究雙冷源新風(fēng)機組的性能特性,為新風(fēng)機組的設(shè)計開發(fā)提供支持。首先,本文研究了溫濕度獨立控制空調(diào)系統(tǒng)新風(fēng)運行策略�；诠I(yè)通風(fēng)中的全面通風(fēng)方程,類比提出了室內(nèi)空氣含濕量動態(tài)模型。當使用溫濕度獨立控制空調(diào)系統(tǒng)的辦公建筑室內(nèi)無辦公人員時,提出將新風(fēng)滲透濕負荷作為房間濕負荷的主要來源。并將該模型用于除濕新風(fēng)量和預(yù)除濕時間的確定,得出不同送風(fēng)含濕量下適宜的人均新風(fēng)量和新風(fēng)預(yù)除濕時間,為溫濕度獨立控制空調(diào)系統(tǒng)中的輻射空調(diào)系統(tǒng)間歇節(jié)能運行提供參考依據(jù)。其次,建立了雙冷源新風(fēng)機組仿真平臺。雙冷源新風(fēng)機組建模仿真的主要研究對象是空氣源熱泵系統(tǒng)、前級表冷器和離心風(fēng)機。對壓縮機、冷凝器、膨脹閥、蒸發(fā)器和前級表冷器等主要部件進行建模。基于建立的仿真程序,分別對表冷器和蒸發(fā)器進行了仿真計算,研究機組變工況運行特性。計算比較了雙冷源新風(fēng)機組和單冷源新風(fēng)機組整機能耗和整機COP,得出雙冷源新風(fēng)機組整機能耗低于單冷源新風(fēng)機組,整機COP高于單冷源新風(fēng)機組。研究了雙冷源新風(fēng)機組中表冷器和蒸發(fā)器負荷分配比例,得出當表冷器與蒸發(fā)器所承擔的負荷比例為7：3時,能實現(xiàn)新風(fēng)機組整機能耗最低,COP最高。最后,對雙冷源新風(fēng)機組的冬季排風(fēng)熱回收工況進行實驗研究,分析了新風(fēng)溫度和回風(fēng)溫度對新風(fēng)機組工作性能的影響。計算比較了機組在冬季排風(fēng)熱回收工況和常規(guī)空氣源熱泵冬季工況的熱泵供熱量和COP,分析了機組的熱回收效率。
[Abstract]:In the traditional air conditioning system, the indoor heat and humidity load in summer is borne by a single cold source, which results in the energy loss of combined heat and humidity treatment. Problems such as mismatch of heat / humidity ratio and poor indoor air quality, and air conditioning systems with independent temperature and humidity control are more and more widely used in civil and industrial buildings. The fresh air system in the air conditioning system bears all the indoor wet load. So it is necessary to study the performance characteristics of the double cold source fresh air unit to provide support for the design and development of the fresh air unit. In this paper, the operation strategy of fresh air in air conditioning system with independent control of temperature and humidity is studied, based on the overall ventilation equation in industrial ventilation. The dynamic model of indoor air moisture content is put forward by analogy. When there is no office personnel in office buildings with air conditioning system controlled by temperature and humidity independently. It is proposed that the wet load of fresh air permeate as the main source of room wet load, and the model is used to determine the fresh air volume and pre-dehumidification time of dehumidification. The suitable per capita fresh air volume and pre-dehumidification time of fresh air under different moisture content of air supply can provide a reference for the intermittent energy saving operation of radiation air conditioning system in the independent control of temperature and humidity. The main research objects of modeling and simulation of double cold source fresh air unit are air source heat pump system, front stage surface cooler and centrifugal fan, compressor, condenser, expansion valve. Based on the established simulation program, the simulation of the evaporator and the evaporator is carried out respectively. The energy consumption and COPof the dual cold source fresh air unit and the single cooling source fresh air unit are calculated and compared, and the result shows that the energy consumption of the double cold source fresh air unit is lower than that of the single cold source fresh air unit. The COP of the whole machine is higher than that of the fresh air unit with single cooling source. The load distribution ratio of the surface cooler and the evaporator in the double cold source fresh air unit is studied, and it is concluded that when the load ratio between the surface cooler and the evaporator is 7: 3. The energy consumption of the whole unit is the lowest and the cop is the highest. Finally, the experimental study on the winter exhaust heat recovery condition of the double cold source fresh air unit is carried out. The influence of fresh air temperature and return air temperature on the performance of fresh air unit is analyzed. The heat supply and COP of heat pump in winter exhaust heat recovery and conventional air source heat pump in winter are calculated and compared. The heat recovery efficiency of the unit is analyzed.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU83

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