本文選題：空氣源熱泵 + 數(shù)值模擬��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：空氣源熱泵充分利用了自然資源,并且安裝方便、初投資較低,所以它在中國得到了廣泛的使用。當(dāng)空氣源熱泵機(jī)組成群布置時(shí),機(jī)組出風(fēng)口空氣易發(fā)生回流,從而影響機(jī)組換熱效率。本文以數(shù)值模擬的方法研究不同布置方式、主導(dǎo)風(fēng)向和機(jī)組間距等對(duì)機(jī)組回流的影響。以單臺(tái)空氣源熱泵機(jī)組為例,詳細(xì)完成了本文的數(shù)值模擬過程,該過程包括物理模型的建立、網(wǎng)格的劃分以及求解器的設(shè)置,結(jié)果顯示單臺(tái)空氣源熱泵機(jī)組回流情況符合實(shí)際規(guī)律。模擬分析了布置方式、主導(dǎo)風(fēng)向、機(jī)組數(shù)量和機(jī)組間距對(duì)單排布置機(jī)組回流的影響,可以看出:機(jī)組單排布置時(shí)應(yīng)盡量采取機(jī)組進(jìn)風(fēng)口相對(duì)布置和主導(dǎo)風(fēng)平行于進(jìn)風(fēng)口的組合形式;機(jī)組間距達(dá)到1.7m~2.1m時(shí),機(jī)組間距對(duì)單排機(jī)組回流影響可忽略不計(jì);機(jī)組數(shù)量大于5臺(tái)時(shí),機(jī)組數(shù)量對(duì)單排機(jī)組回流影響可忽略不計(jì)。模擬分析了布置方式、主導(dǎo)風(fēng)向和機(jī)組間距對(duì)多排布置機(jī)組回流的影響,可以看出:機(jī)組多排布置時(shí)應(yīng)盡量采取機(jī)組長(zhǎng)軸進(jìn)風(fēng)口相對(duì)布置和主導(dǎo)風(fēng)向垂直于機(jī)組長(zhǎng)軸的組合形式;機(jī)組間距達(dá)到2.5~2.9m時(shí),機(jī)組間距對(duì)單排機(jī)組回流影響可忽略不計(jì)。分析了某實(shí)際空氣源熱泵機(jī)組群的不合理性,用數(shù)值模擬的方法驗(yàn)證了未改進(jìn)前機(jī)組群回流嚴(yán)重的結(jié)論。提出了幾種改進(jìn)方案,包括:改變機(jī)組布置方式、為機(jī)組添加拔風(fēng)罩和將周圍擋板下部改為百葉。為機(jī)組添加拔風(fēng)罩的方案改進(jìn)效果較好,而另兩種效果不佳。最終,確定綜合改進(jìn)方案,并通過數(shù)值模擬評(píng)估了改進(jìn)效果。
[Abstract]:Air source heat pump (AHP) is widely used in China because it makes full use of natural resources and is easy to install and low initial investment. When the air source heat pump units are arranged in groups, the air at the outlet of the units is easily reflux, which affects the heat transfer efficiency of the units. In this paper, numerical simulation is used to study the effects of different layout, dominant wind direction and unit spacing on the return flow of the unit. Taking a single air source heat pump unit as an example, the numerical simulation process of this paper is completed in detail. The process includes the establishment of physical model, the division of grid and the setting of solver. The results show that the reflux of a single air source heat pump unit accords with the actual law. The effects of layout mode, leading wind direction, number of units and unit spacing on the return flow of single-row layout units are simulated and analyzed. It can be seen that the relative arrangement of the unit inlet and the leading wind parallel to the inlet should be adopted as far as possible when the single row arrangement of the unit is arranged, and when the unit spacing reaches 1.7m~2.1m, the influence of the unit spacing on the reflux of the single row unit can be ignored. When the number of units is more than 5, the effect of unit number on single row unit return is negligible. The effects of layout mode, leading wind direction and unit spacing on the reflux of multi-row layout units are simulated and analyzed. It can be seen that the relative arrangement of the long shaft inlet and the main wind direction should be adopted as far as possible when the units are arranged in multiple rows, and the influence of unit spacing on the return flow of single row units can be ignored when the unit spacing reaches 2.5 ~ 2.9 m. The irrationality of an actual air source heat pump unit is analyzed and the conclusion of serious reflux before the improvement is verified by numerical simulation. Several improvement schemes are put forward, including changing the layout of the unit, adding a draft hood for the unit and changing the lower part of the surrounding baffle to a shutter. The improvement effect of adding air hood to the unit is better, but the other two are not good. Finally, the comprehensive improvement scheme is determined, and the improvement effect is evaluated by numerical simulation.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU83

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