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Experimental Study on Ice Slurry Refrigeration System with pre-cooling Heat Exchanger

Engineering（科研） 2015年第5期7卷 230-236页

作者： Xukai Yang Shengchun Liu Tianjin Key Laboratory of Refrigeration Technology Tianjin University of Commerce Tianjin China

In the present study, the ice slurry refrigeration system with pre-cooling heat exchanger (ISSH) is studied experimentally to achieve the system performance, ice crystal formation time and the temperature of ice crystal formation. The operating parameters considered in this paper include the concentration of salt solution, suction pressure, discharge pressure and Energy Efficiency Ratio (EER). The result shows that the temperature of critical time of ice crystal formation decreases with the increasing concentration of salt solution and that the ice crystal formation time increases with the increasing concentration of salt solution. In the same concentration of salt solution, the ice crystal formation temperature of ISSH is lower than that of basic ice slurry refrigeration system (BISS), and the ice crystal formation time of ISSH is shorter than that of BISS. On the whole, the EER of ice slurry refrigeration system with pre-cooling heat exchanger is higher than that of basic ice slurry refrigeration system.

关键词： Ice Slurry Refrigeration System pre-cooling Heat Exchanger EER

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Minimizing Energy Cost of Air Conditioner in a Residential House under Demand Side Response Model

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Journal of Electronic Science and Technology 2017年第4期15卷 377-384页

作者： Marwan Marwan Syafaruddin Electrical Engineering Department Polytechnic State of Ujung Pandang Makassar 90245 Indonesia Electrical Engineering Department Hasanuddin University Makassar 90245 Indonesia

This research is aimed to develop a consumer demanding side response model to assist electricity consumers to mitigate peak demands during the peak season. The main contribution of this research is showing that consumers can mitigate peak demands by optimizing energy costs of an air conditioner(AC) when a spike happens. It may only occur in a one and a half hours spike during the peak season. This model also investigates how AC applies the pre-cooling method when there is a substantial risk of a price spike. The results indicate that the potential benefit of the model is achieving energy savings for consumers and aggregators,also reducing electricity bills for the consumers. The model is tested with selected characteristics of the room,and based on the standard room in a residential house in Makassar, a city of Indonesia.

关键词： Consumer cooling costs modeling pre-cooling temperature

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Comparison of the effects of cold water and ice ingestion on endurance cycling capacity in the heat

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Journal of Sport and Health Science 2017年第1期6卷 111-117页

作者： Takashi Naito Tetsuro Ogaki Graduate School of Human-Environment Studies Kyushu UniversityFukuoka 40218Japan

Purpose: The purpose of this study was to examine the effects of pre-cooling and fluid replacement with either crushed ice or cold ***: On 2 separate occasions, in a counterbalanced order, 9 recreationally-trained males ingested 1.25 g/kg(80–100 g) of either crushed ice(0.5℃)or cold water(4℃) every 5 min for 30 min before exercise. They also ingested 2.0 g/kg(130–160 g) of the same treatment drink at 15 min, 30 min, and45 min after the commencement of cycling to exhaustion at 60%VO_(2max) until voluntary exhaustion in a hot environment(35℃ and 30% relative humidity).Results: The cycling time to exhaustion in the crushed ice trial(50.0 ± 12.2 min) was longer than the cold water trial(42.2 ± 10.1 min; p = 0.02).Although the rectal temperature fell by 0.37℃± 0.03℃(p = 0.01) at the end of the resting period after the crushed ice ingestion, the rates of rise in rectal temperature during the exercise period were not significantly different between these 2 conditions(crushed ice: 0.23℃± 0.07℃, 5 min;cold water: 0.22℃± 0.07℃, 5 min; p = 0.94).Conclusion: Crushed ice ingestion before and during exercise in a hot environment may be a preferred and effective approach for minimizing thermal strain, and for improving endurance performance as compared with cold water ingestion.

关键词： Cold water ingestion pre-cooling Rectal temperature Thermoregulation

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Schemes for Producing 1.8 He Ⅱ and the prediction of the Pumping Speed for the Method of Vacuum-Pumping

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Journal of Shanghai Jiaotong university(Science) 2007年第1期12卷 106-110页

作者：陈煜郑青榕鲁雪生顾安忠林文胜 Inst.of Refrigeration and Cryogenics Shanghai Jiaotong Univ.

Cryogenic ground supporting equipment (CGSE) developed for international cooperation scientific experimental item AMS-02 is the ground supporting and cooling system, which will complete the cooling process of the superconductor of AMS-02 from ambient temperature to 1.8 K. Obtaining 1.8 K He Ⅱ by vacuum-pumping is discussed in detail and compared with the other three schemes. The results show that the scheme of vacuum-pumping not only could meet the requirement of the project much better but also has higher reliability compared with other schemes. To select the vacuum pump, the energy conservation model is presented according to the experimental system of CGSE. Therefore, the pumping speed is also determined.

关键词： He Ⅱ throttling pre-cooling vacuum-pumping pumping speed

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