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超临界二氧化碳D型管内对流换热研究 被引量:2
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作者 张丽娜 刘敏珊 董其伍 《机械设计与制造》 北大核心 2010年第7期102-104,共3页
D型管换热器应用于快速气冷堆超临界二氧化碳循环中,对超临界二氧化碳在竖直D型管中的对流换热进行了计算研究。分析二氧化碳质量流量、冷却水质量流量以及当量直径等参数对超临界二氧化碳对流换热的影响。结果表明,由于准临界点附近剧... D型管换热器应用于快速气冷堆超临界二氧化碳循环中,对超临界二氧化碳在竖直D型管中的对流换热进行了计算研究。分析二氧化碳质量流量、冷却水质量流量以及当量直径等参数对超临界二氧化碳对流换热的影响。结果表明,由于准临界点附近剧烈变物性的影响超临界二氧化碳在D型管内的对流换热非常复杂。对流换热随着温度远离准临界温度,热流密度的增加不断减弱。流量对对流换热的影响比较复杂。在准临界温度附近,浮升力对换热有一定的影响。 展开更多
关键词 快速气冷堆 超临界二氧化碳 d型管 对流换热
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D型管内超临界CO_2对流换热 被引量:1
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作者 张丽娜 刘敏珊 董其伍 《南京工业大学学报(自然科学版)》 CAS 北大核心 2009年第5期42-46,共5页
D型管换热器应用于快速气冷堆超临界CO2循环中,对其对流换热特性研究显得尤为重要.通过计算流体力学软件FLUENT,对超临界CO2在竖直D型管中的对流换热进行了计算研究,并与相同当量直径的圆管进行比较.分析热流密度、质量流量、当量直径... D型管换热器应用于快速气冷堆超临界CO2循环中,对其对流换热特性研究显得尤为重要.通过计算流体力学软件FLUENT,对超临界CO2在竖直D型管中的对流换热进行了计算研究,并与相同当量直径的圆管进行比较.分析热流密度、质量流量、当量直径等参数对超临界CO2对流换热的影响.结果表明,冷却条件下,CO2流体主体达到临界温度前,局部换热系数达到最大值.CO2流量和通道当量直径的变化对传热具有较大影响,冷却水质量流量影响较弱. 展开更多
关键词 对流换热 超临界CO2 快速气冷堆 d型管
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D型管蒸发器在卧式冷柜的应用研究 被引量:4
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作者 魏华锋 杨波 +1 位作者 程凯 何广 《制冷技术》 2012年第4期42-45,共4页
节能冷柜越来越多地被使用,尤其国家出台的节能惠民政策,提高对冷柜的节能要求,节能冷柜的成本也面临着考验。本文对D型管蒸发器在卧式节能冷柜上的应用进行了研究;验证了D型管蒸发器实现了7%的节能效果,同时,D型管蒸发器提高卧式冷柜... 节能冷柜越来越多地被使用,尤其国家出台的节能惠民政策,提高对冷柜的节能要求,节能冷柜的成本也面临着考验。本文对D型管蒸发器在卧式节能冷柜上的应用进行了研究;验证了D型管蒸发器实现了7%的节能效果,同时,D型管蒸发器提高卧式冷柜生产效率,提高了产品质量。 展开更多
关键词 冷柜 d型管蒸发器 节能 压缩机
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一种D型管节能冷柜产品的研究 被引量:3
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作者 李扬 张赛 +1 位作者 庆增武 张华伟 《家电科技》 2015年第12期82-84,共3页
主要介绍了D型管的成型原理、特点及D型管蒸发器在传热效率上的提升;首创铝制D型管的成型设备,并将它们应用于蒸发器的制作上,以此实现冰箱冷柜产品能耗的降低及目前低能耗产品的开发。
关键词 d型管 蒸发器 传热效率 节能冷柜
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装载机用D型管接头
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作者 胡浩 高晔 《工程机械与维修》 1999年第5期64-65,共2页
关键词 装载机 轮式 d型管接头 密封 液压系统
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Type D personality negatively associated with self-care in Chinese heart failure patients 被引量:9
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作者 Xi CAO Xiu-Hua WANG +2 位作者 Eliza ML Wong Choi Kai Chow Sek Ying Chair 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2016年第5期401-407,共7页
Background Little is known about the association between type D personality and self-care behaviors in heart failure (HF) patients. We examined the effect of type D personality on self-care behaviors and self-effica... Background Little is known about the association between type D personality and self-care behaviors in heart failure (HF) patients. We examined the effect of type D personality on self-care behaviors and self-efficacy among Chinese HF patients. Methods A cross-sectional study with a convenience sample was conducted. All participants completed the questionnaires of the self-care of HF index (V6) and type D personality scale. Demographic and clinical variables were obtained from medical records and patient interviews. The me- thods used for data analysis included descriptive analysis, independent-sample t-test, Z2 test, and multiple linear regression. Results A total of 127 HF patients were included and 61.4% of them were male. The average age for this study sample was 64.9± 12.34 years. The majority of the participants were in a New York Heart Association class III or IV (87%), and the average length of living with HF was 38.24 ± 41.1 months. A total of 33.1% of the participants were identified as having type D personality. No significant differences were determined in the demographic and clinical variables between type D and non-type D patients, except for the mean age and the length of living with HF. Type D patients were younger and had a shorter time of living with HF than their non-type D counterparts. Multiple regression demonstrated significant associations between type D personality and self-care maintenance and self-efficacy after adjusting the demographic and clinical factors. However, type D personality was not significantly associated with self-care management behaviors. Conclusions Type D personality was negatively related to self-care maintenance and self-efficacy in Chinese HF patients. Future study is warranted to develop a tailored intervention to improve engagement in self-care behaviors in HF patients with type D personality. 展开更多
关键词 Heart failure Self care SELF-EFFICACY Type d personality
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