CAJ | 학술논문

为了解决CO_2跨临界循环能效低、排气压力高的问题,将天然工质N_2O用于跨临界循环,建立了相应的理论模型,比较了N_2O和CO_2用于跨临界喷射/压缩制冷循环和简单跨临界循环的性能,并对N_2O用于跨临界循环中的热稳定性进行了分析.研究结果表明:N_2O系统的性能系数和排气压力均优于CO_2,性能系数较CO_2系统分别增加了13%和9%,而排气压力分别降低了16%和13%;CO_2系统采用喷射/压缩跨临界循环后性能系数比简单跨临界循环提高了15.2%,稍高于N_2O系统的11.6%,说明使用喷射器对于CO2系统性能提升更为有利.分析了高压侧排气压力、蒸发温度和气体冷却器出口温度对于CO_2和N_2O跨临界喷射/压缩制冷循环的影响.结果表明:工况变化时N_2O和CO_2系统性能的变化规律一致,且气体冷却器出口温度越低、蒸发温度越高时,N_2O系统的性能系数增加越明显;制冷系统中N_2O的热稳定性能很好,不会分解.
위료해결CO_2과림계순배능효저、배기압력고적문제,장천연공질N_2O용우과림계순배,건립료상응적이론모형,비교료N_2O화CO_2용우과림계분사/압축제랭순배화간단과림계순배적성능,병대N_2O용우과림계순배중적열은정성진행료분석.연구결과표명:N_2O계통적성능계수화배기압력균우우CO_2,성능계수교CO_2계통분별증가료13%화9%,이배기압력분별강저료16%화13%;CO_2계통채용분사/압축과림계순배후성능계수비간단과림계순배제고료15.2%,초고우N_2O계통적11.6%,설명사용분사기대우CO2계통성능제승경위유리.분석료고압측배기압력、증발온도화기체냉각기출구온도대우CO_2화N_2O과림계분사/압축제랭순배적영향.결과표명:공황변화시N_2O화CO_2계통성능적변화규률일치,차기체냉각기출구온도월저、증발온도월고시,N_2O계통적성능계수증가월명현;제랭계통중N_2O적열은정성능흔호,불회분해.
A theoretical model of the transcritical refrigeration cycle with natural refrigerant N_2O was established,and the performance of the transcritical compression/ejection cycle and the simpie transcritical cycle with N_2O was compared with that with CO_2.The results show that the coefficient of performance C_(COP) of the N_2O system increases by 13%for the transcritical compression/ejection cycle and by 9%for the simple transcritical cycle compared with that of the CO_2 system.However,the discharge pressure decreases by 16%and 13%,respectively.Moreover,theC_(COPP) of the CO_2 system increases by 15.2%when adding an ejector while the C_(COP) of the N_2O system increases by 11.6%,compared with that of the simple transcritical cycle The influence of the high side discharge pressure,evaporation temperature and gas cooler outlet temperature on the performance of the transcritical compression/ejection cycle with N_2O or CO_2 was also analyzed.The results indicate that the variation trends of the CO_2 system and the N_2O system are similar,and the C_(COP) of the N_2O system increases more obviously than that of the CO_2 system when the gas cooler outlet temperature is lower or the evaporation temperature is higher.The analysis on the thermal stability of N_2O shows that N_2O has good thermal stability and will not be decomposed in the transcritical refrigeration cycle.