制冷
製冷
제랭
Refrigeration
2015年
3期
13-19
,共7页
压力波制冷机%制冷效率%强化传热%风冷却%自然对流
壓力波製冷機%製冷效率%彊化傳熱%風冷卻%自然對流
압력파제랭궤%제랭효솔%강화전열%풍냉각%자연대류
Pressure wave refrigerator%Refrigeration Efficiency%Heat Transfer%Air Cooling%Nature Cooling
采用理论与实验相结合的方法, 研究了强化压力波制冷机管外传热状况对其制冷效率的影响. 研究中采用定量方法对振荡管外壁首次以风冷方式强化传热, 对比自然对流条件下研究制冷性能的变化. 结果表明: 提高管外内温度比α和增大排气压力管内压力比β都能使总制冷效率η变大; 强化管外传热风冷却方法可使制冷效率提升8% ~10%, 效果明显优于原来的自然对流条件下制冷效率, 且短管效果明显好于长管, 但提升效果受管长、 介质流量等诸多因素影响且效果有限; 相比自然对流, 强化管外传热能在极大程度上稳定振荡管制冷效率曲线, 扩大压力波制冷机高制冷效率下平稳运行的射流频率f范围, 促使最佳射流频率f降低10~15Hz,并使制冷效率曲线峰值前移,从而以较低转速达到最大制冷效率,有效降低系统总能耗并提高机器寿命.
採用理論與實驗相結閤的方法, 研究瞭彊化壓力波製冷機管外傳熱狀況對其製冷效率的影響. 研究中採用定量方法對振盪管外壁首次以風冷方式彊化傳熱, 對比自然對流條件下研究製冷性能的變化. 結果錶明: 提高管外內溫度比α和增大排氣壓力管內壓力比β都能使總製冷效率η變大; 彊化管外傳熱風冷卻方法可使製冷效率提升8% ~10%, 效果明顯優于原來的自然對流條件下製冷效率, 且短管效果明顯好于長管, 但提升效果受管長、 介質流量等諸多因素影響且效果有限; 相比自然對流, 彊化管外傳熱能在極大程度上穩定振盪管製冷效率麯線, 擴大壓力波製冷機高製冷效率下平穩運行的射流頻率f範圍, 促使最佳射流頻率f降低10~15Hz,併使製冷效率麯線峰值前移,從而以較低轉速達到最大製冷效率,有效降低繫統總能耗併提高機器壽命.
채용이론여실험상결합적방법, 연구료강화압력파제랭궤관외전열상황대기제랭효솔적영향. 연구중채용정량방법대진탕관외벽수차이풍랭방식강화전열, 대비자연대류조건하연구제랭성능적변화. 결과표명: 제고관외내온도비α화증대배기압력관내압력비β도능사총제랭효솔η변대; 강화관외전열풍냉각방법가사제랭효솔제승8% ~10%, 효과명현우우원래적자연대류조건하제랭효솔, 차단관효과명현호우장관, 단제승효과수관장、 개질류량등제다인소영향차효과유한; 상비자연대류, 강화관외전열능재겁대정도상은정진탕관제랭효솔곡선, 확대압력파제랭궤고제랭효솔하평은운행적사류빈솔f범위, 촉사최가사류빈솔f강저10~15Hz,병사제랭효솔곡선봉치전이,종이이교저전속체도최대제랭효솔,유효강저계통총능모병제고궤기수명.
The influence of the oscillating tube' s intensifying heat transfer on the performance of pressure wave re-frigerator are analyzed theoretically and studied experimentally in this paper. In the investigation, the air cooling is choosed and controlled in quantitative method, comparing with nature cooling. The result show that the total refrige-ration efficiency η would increase when turning up the environmental parameters α and β. The air cooling, as the method of intensifying heat transfer, would enhance refrigeration efficiency η8% ~10% much better than the na-ture cooling. Although the increasing effect on short tube would be obvious than the long tube, the promotion in re-frigeration efficiency would still be limited by many structural factors, i. e. the length of tube, medium flow, and has the upper limit value. The intensifying heat transfer of oscillating tube would make the refrigeration efficiency curve stability, expand the range of the pulsing frequency f corresponding to the higher refrigeration efficiency, and drease the optimum frequency 10~15Hz, making the the optimum refrigeration efficiency can be reached in a low rotation speed, which has great significance in reducing energy consumption and machine life.
