【摘要】：在夏熱冬冷地區(qū),由于其特定的氣候條件,建筑全年冷負(fù)荷遠(yuǎn)遠(yuǎn)大于熱負(fù)荷,土壤源熱泵系統(tǒng)長期單獨運行將導(dǎo)致釋放到土壤中的熱量遠(yuǎn)遠(yuǎn)大于從土壤中提取的熱量,致使土壤溫度逐年升高,熱泵工作條件持續(xù)惡化,機(jī)組性能系數(shù)下降,從而影響空調(diào)系統(tǒng)的正常運行。新型空氣-土壤復(fù)合熱源熱泵系統(tǒng)能夠解決土壤源熱泵系統(tǒng)單獨運行所導(dǎo)致的土壤熱失衡問題,系統(tǒng)性能系數(shù)較高。但對于項目投資者而言,不光要考慮系統(tǒng)性能,經(jīng)濟(jì)性也是其需要考慮的重要因素。本文以長沙某別墅建筑空調(diào)系統(tǒng)為例,利用TRNSYS仿真模擬軟件對連續(xù)運行和間歇運行兩種運行模式下的空氣-土壤復(fù)合熱源熱泵系統(tǒng)和單一土壤源熱泵系統(tǒng)的全年運行能耗進(jìn)行模擬研究。計算各方案的初投資、運行維護(hù)費用,并用動態(tài)費用年值法對各方案的經(jīng)濟(jì)性進(jìn)行評價。選用基準(zhǔn)折現(xiàn)率、系統(tǒng)壽命周期及系統(tǒng)初投資作為敏感性分析因素,研究各方案下敏感因素對費用年值影響的敏感程度,從而找出最敏感因素,為投資者做出正確的決策提供參考。研究結(jié)果表明:無論是在連續(xù)運行還是間歇運行模式下,相比于單一土壤源熱泵系統(tǒng),新型空氣-土壤復(fù)合熱源熱泵系統(tǒng)具有一定的經(jīng)濟(jì)性優(yōu)勢,分別只需6.2年和7.8年即可收回追加投資額。對空氣-土壤復(fù)合熱源熱泵系統(tǒng)和單一土壤源熱泵系統(tǒng)而言,連續(xù)運行模式都要比間歇運行模式更為經(jīng)濟(jì)。另外,通過對系統(tǒng)進(jìn)行敏感性分析,表明初投資對系統(tǒng)費用年值的影響程度最大,基準(zhǔn)折現(xiàn)率次之,壽命周期對費用年值的影響程度最小,且費用年值隨著初投資和基準(zhǔn)折現(xiàn)率的增大而增大,隨壽命周期的增大而減小。
[Abstract]:In the hot summer and cold winter area, because of its special climatic conditions, the annual cooling load of the building is far greater than the heat load, and the long-term operation of the ground-source heat pump system alone will lead to the release of heat into the soil much more than the heat extracted from the soil. As a result, the soil temperature increases year by year, the working condition of heat pump continues to deteriorate, and the performance coefficient of the unit decreases, thus affecting the normal operation of the air conditioning system. The new air-ground composite heat source heat pump system can solve the problem of soil heat imbalance caused by the single operation of the ground-source heat pump system, and the system performance coefficient is high. But for the project investors, not only the system performance should be considered, but also the economy is an important factor to be considered. This paper takes the air conditioning system of a villa building in Changsha as an example. The annual energy consumption of air-ground heat pump system and single ground source heat pump system under continuous and intermittent operation was simulated by TRNSYS software. The initial investment and maintenance cost of each scheme are calculated, and the economy of each scheme is evaluated by using the dynamic cost annual value method. The sensitivity analysis factors such as benchmark discount rate, system life cycle and system initial investment are selected to study the sensitivity of the sensitive factors to the annual cost value under each scheme, so as to find out the most sensitive factors. For investors to make the right decisions to provide reference. The results show that the new air-ground heat source heat pump system has a certain economic advantage compared with a single ground source heat pump system under the continuous or intermittent operation mode. It only takes 6.2 years and 7.8 years to recover the additional investment, respectively. For the air-ground heat pump system and the single ground source heat pump system, the continuous operation mode is more economical than the intermittent operation mode. In addition, the sensitivity analysis of the system shows that the impact of initial investment on the annual cost of the system is the largest, followed by the benchmark discount rate, and the impact of life cycle on the annual cost value is the least. The annual cost value increases with the increase of the initial investment and the base discount rate, and decreases with the increase of the life cycle.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU83

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