本文選題：空氣源熱泵　切入點：閃發(fā)器　出處：《天津商業(yè)大學》2017年碩士論文

【摘要】：日益嚴重的能源緊缺及環(huán)境污染問題,亟待解決的臭氧層保護及溫室氣體減排問題已成為國際社會共同面臨的難題。近年來,R32以其零ODP、低GWP、優(yōu)良熱物性及低廉價格逐漸顯露出競爭優(yōu)勢。為解決寒冷地區(qū)冬季采暖用空氣源熱泵出現(xiàn)的制熱量不足、排氣溫度高、系統(tǒng)工作不穩(wěn)定等問題,本課題利用閃發(fā)器中間補氣增焓技術,對傳統(tǒng)渦旋壓縮機單級熱泵系統(tǒng)進行改進,在提高系統(tǒng)制熱量,滿足供暖需求的同時,降低壓縮機排氣溫度,對系統(tǒng)運行的穩(wěn)定性及安全性的提高具有重要意義。本文對提高空氣源熱泵系統(tǒng)性能的方法進行了比較分析,著重分析了閃發(fā)器中間補氣技術的特點及需滿足的必要條件,建立了中間補氣渦旋壓縮機數(shù)學模型,利用EES軟件編程并理論計算分析了不同環(huán)境條件下補氣壓力的最佳取值范圍,并將最佳補氣壓力下閃發(fā)器中間補氣熱泵系統(tǒng)性能參數(shù)與傳統(tǒng)熱泵系統(tǒng)進行對比,得出兩系統(tǒng)參數(shù)變化規(guī)律及其最佳切換環(huán)境溫度范圍�；诶碚撚嬎憬Y(jié)果,對閃發(fā)器中間補氣空氣源熱泵系統(tǒng)實驗臺主要設備進行校核計算選型,在焓差法實驗室搭建熱泵系統(tǒng)性能測試實驗臺,按國家標準規(guī)定制定實驗工況,測試不同補氣壓力下閃發(fā)器熱泵系統(tǒng)動態(tài)性能,實驗研究了閃發(fā)器中間補氣R32空氣源熱泵系統(tǒng)的變工況性能。實驗結(jié)果表明,在保持室內(nèi)側(cè)環(huán)境干球溫度20°C不變、室外側(cè)環(huán)境干球溫度不同的條件下,閃發(fā)器熱泵系統(tǒng)的相對補氣量、制熱量以及壓縮機耗功均隨著相對補氣壓力的增高而增大,排氣溫度隨著相對補氣壓力的升高而下降。制熱COP則隨著相對補氣壓力的升高呈現(xiàn)出不同的變化趨勢:在環(huán)境溫度高于-5°C時,相對補氣壓力升高,制熱COP呈緩慢下降趨勢;在環(huán)境溫度低于-5°C時,相對補氣壓力升高,制熱COP則出現(xiàn)先增加后減小趨勢。綜合考慮各因素,在保證系統(tǒng)運行可靠前提下確定最佳相對補氣壓力為1.2左右。通過對最佳相對補氣壓力下閃發(fā)器熱泵系統(tǒng)與傳統(tǒng)單級系統(tǒng)性能實驗數(shù)據(jù)的對比分析,結(jié)果表明閃發(fā)器中間補氣系統(tǒng)比傳統(tǒng)熱泵系統(tǒng)在低溫工況下具有更大的制熱量以及更低的排氣溫度;在室外干球溫度為-10°C時,閃發(fā)器中間補氣熱泵系統(tǒng)制熱量較傳統(tǒng)單級系統(tǒng)提高了14.6%,排氣溫度降低了19.2°C。在環(huán)境溫度高于-3.1°C時,傳統(tǒng)單級系統(tǒng)制熱COP高于閃發(fā)器補氣系統(tǒng),在環(huán)境溫度低于-3.1°C時,閃發(fā)器補氣系統(tǒng)制熱COP高于傳統(tǒng)單級系統(tǒng),因此確定閃發(fā)器系統(tǒng)與傳統(tǒng)單級系統(tǒng)切換的室外環(huán)境溫度范圍為-3.1°C左右。最佳相對補氣壓力下閃發(fā)器補氣系統(tǒng)與過冷器中間補氣系統(tǒng)性能參數(shù)的對比分析表明,閃發(fā)器中間補氣系統(tǒng)具有更高的制熱COP,在室外干球溫度為-10°C的條件下,閃發(fā)器系統(tǒng)制熱COP提高了4.9%�？偟膩碚f,閃發(fā)器中間補氣可以有效改善空氣源熱泵冬季運行性能,使系統(tǒng)安全可靠,同時具有結(jié)構(gòu)簡單等特點,適合冬季寒冷地區(qū)采暖使用。
[Abstract]:The shortage of energy and the increasingly serious problem of environmental pollution, ozone layer protection and greenhouse gas emission reduction problem has become a problem facing the international community. In recent years, R32 with zero ODP, low GWP, low price and excellent heat gradually revealed competitive advantage. For the lack of capacity to solve the cold winter heating area of air source heat pump for the exhaust temperature is high, the system is not stable, the subject of the use of flash-tank intermediate pressure enthalpy of scroll compressor technology, traditional single-stage heat pump system was improved, in improving the system of heat, to meet the heating needs at the same time, reducing the exhaust temperature of the compressor, is of great significance to the stability the safety and operation of the system is improved. This paper makes a comparative analysis on the methods of improving the performance of air source heat pump system, analyzes the characteristics of flash-tank middle Qi technology and full The necessary conditions of foot, establishes the mathematical model of scroll compressor air, EES software programming and the analysis of the optimal range of air pressure under different environmental conditions by theoretical calculation, and comparing the flash parameters of heat pump system performance is between Qi and the traditional heat pump system optimal superfeed pressure, the variation of system parameters and the best two switching environment temperature range. Based on the theoretical calculations, to check the flash-tank intermediate pressure air source heat pump experimental system of main equipment selection calculation, difference method in laboratory experiment system built enthalpy heat pump system performance test, establish experimental conditions according to the national standards, testing different air pressure economizer heat pump system dynamic performance. Experimental study on the performance of variable working condition flash-tank middle air R32 air source heat pump system. The experimental results show that the indoor environment to keep dry side The temperature of 20 DEG C ball bulb temperature conditions unchanged, different outdoor environment dry, flash relative air supply heat pump system, heat and power consumption of the compressor increases with the increase of relative air pressure, exhaust temperature decreases with the relative air pressure. The heating of COP would increase with the relative air pressure showing a different trend: the ambient temperature is higher than -5 ~ C, the relative air pressure, heating COP decreased slowly; when the ambient temperature is lower than -5 ~ C, the relative air pressure, heating COP first increases and then decreases. The trend of comprehensive consideration of various factors, in the system reliable premise to determine the optimal relative intermediate pressure is about 1.2. By comparing the optimal relative air under pressure economizer heat pump system and the traditional single level system performance analysis of experimental data, results show that flash-tank intermediate pressure system The greater than with traditional heat pump system in low temperature condition of heat capacity and lower exhaust temperature; in the outdoor dry bulb temperature is -10 DEG C, flash-tank middle air heating heat pump system compared with the traditional single level system is increased by 14.6%, reducing the exhaust temperature of 19.2 DEG C. at ambient temperature is higher than -3.1. C, heating COP traditional single level system is higher than that of economizer of air supply system, when the ambient temperature is lower than -3.1 DEG C, flash heat supply system is COP higher than the traditional single level system, thus determining the outdoor temperature range of the switching flash-tank system and the traditional single level system for -3.1 degrees C best. The relative air under pressure economizer air system and compared the parameters of system performance analysis shows that the intermediate cooler air, economizer air heating system with intermediate COP higher, dry bulb temperature conditions is -10 DEG C in the outdoor, the flash heater system of COP increased by 4. 9%., in general, the middle air makeup of flash blink can effectively improve the performance of air source heat pump in winter, make the system safe and reliable, and has the characteristics of simple structure, which is suitable for heating in cold regions in winter.

【學位授予單位】：天津商業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU83

【參考文獻】

相關期刊論文 前10條

1 王超;陶樂仁;楊麗輝;虞中e，

本文編號：1722974