A Multistage Cool Storage System of Natural Coldness Resource Based on Heat Pipe

2012 ◽  
Vol 512-515 ◽  
pp. 1097-1101
Author(s):  
Qi He Li ◽  
Xiao Bao Zhao ◽  
Hu Huang ◽  
Yu Zhou Cheng ◽  
Yu Hua Liu
Keyword(s):  
Heat Pipe ◽  
Storage System ◽  
User Needs ◽  
Environment Protection ◽  
Joint Operation ◽  
Cool Storage ◽  
Refrigeration Unit ◽  
Cold Energy ◽  
Resource Storage ◽  
Day By Day

This article proposes a multistage cool storage system of natural coldness resource storage joint operation with refrigeration unit cool storage using heat pipe as heat transfer components. This system can realize both cold energy stored in winter used in summer which is called “Seasonal storage of cold energy” and cold energy stored at night used in the day which is called “cool storage day by day”. When the user needs cooling, it will choose different cycle way to release cold energy to the cooling user according to the temperature grade of the cool storage medium and the cooling load of the user. This system can achieve the purpose of energy conservation and environment protection.

Data Center Energy Conservation by Heat Pipe Cold Energy Storage System

2010 ◽  
Author(s):  
Xiao Ping Wu ◽  
Masataka Mochizuki ◽  
Koichi Mashiko ◽  
Thang Nguyen ◽  
Tien Nguyen ◽  
...  
Keyword(s):  
Energy Storage ◽  
Heat Pipe ◽  
Data Center ◽  
Heat Load ◽  
Data Centers ◽  
Storage Systems ◽  
Storage System ◽  
Energy Storage System ◽  
Energy Storage Systems ◽  
Cold Energy

In this paper, design and economic analysis for applying a novel type of heat pipe into cold energy storage systems have been proposed and discussed. The heat pipe cold energy storage systems can be designed into several types that are ice storage, cold water storage and pre-cool heat exchanger. Those systems can be used for co-operating with conventional chiller system for cooling data centers. The heat load used for discussing in this paper is 8800 kW which represents a large scale data center. The methodology addressed in this paper can be also converted into the middle and small sizes of the data centers. This type of storage system will help to downsize the chiller and decrease its running time that would be able to save significant electricity cost and decrease green house gas emissions from the electricity generation. The proposed systems can be easily connected into the existing conventional systems without major design changes. The analysis in this paper is using Air Freezing Index AFI >= 400 °C-days/year for sizing the heat pipe modules. For the locations where AFI has different value the storage size will be varied accordingly. The paper also addressed a result that an optimum size of cold energy storage system that should be designed at a level to handle 60% of total yearly heat load of a data center.

Contribution of Heat Pipe to the Energy Conservation of Data Center and Cloud Computers

2011 ◽  
Author(s):  
Masataka Mochizuki ◽  
Thang Nguyen ◽  
Koichi Mashiko ◽  
Yuji Saito ◽  
Xiao Ping Wu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Heat Pipe ◽  
Data Center ◽  
Cold Water ◽  
Storage System ◽  
Water Storage ◽  
Energy Storage System ◽  
Yearly Average ◽  
Data Center Cooling ◽  
Cold Energy

With the current increase of the electrical power consumption of the data center imposed a great concern in the world about sustainable energy and global warming and it is therefore required innovative ideas to conserve the energy consumption. Authors propose the use of heat pipe which is a best known passive heat transfer device that is well suitable apply for energy saving system in the current data center cooling system. In this paper, a design and economics of the novel type of thermal control system for data center cooling using heat pipe based cold energy storage system has been proposed and discussed. The cold water storage system is explained and sized for data center with heat output capacity of 8,800 kW. Basically, the cold energy storage will help to downsize the chiller and decrease its runtime that will save electricity related cost and decrease green house gases emissions resulting from the electricity generation. The proposed cold energy storage system can be retrofit or connected in the existing data center facilities without major design changes. Water based cold energy storage system provides more compact size with short term storage (hours to days) and is potential for both small to large size data center with yearly average temperature below the cold storage water temperature (∼ 25 °C). The cold water storage system is sized on the basis of metrological conditions in North America, USA. As an outcome of the thermal and cost analysis, an optimum size of cold energy storage system should be designed to handle 60% of the yearly data center load. The proposed system can be easily integrated into the existing conventional systems without any significant infrastructure changes. Preliminary results obtained from the experimental system design to test the ice formation potential of the heat pipe based cold energy storage system has been shown good result and validated the proposed concept.

Study on Periodic Thermal-Switching Behavior of Flat Heat Pipe

2015 ◽  
Author(s):  
Shigeki Hirasawa ◽  
Tatsuya Nakamu ◽  
Tsuyoshi Kawanami ◽  
Katsuaki Shirai
Keyword(s):  
Heat Transfer ◽  
Heat Source ◽  
Heat Pipe ◽  
Heat Transfer Performance ◽  
Switching Behavior ◽  
Transfer Performance ◽  
Unsteady Heat Transfer ◽  
Cold Energy ◽  
Thermal Switching ◽  
Flat Heat Pipe

The coupling of the electrocaloric effect in thin films with thermal switches has the potential to be used for efficient refrigeration. We studied the unsteady heat transfer performance and periodic thermal-switching behavior of a flat heat pipe to transfer cold energy from a changing heat source. The condenser of the flat heat pipe was the changing heat source and changed from −20 W to +20 W every 5 s. The temperature of the condenser surface changed in accordance with the heat generation of the heat source. The evaporator was a plate with a mesh wick attached to a water-flow pipe. Cold energy transferred from the condenser surface to the evaporator surface only when the temperature of the condenser surface was lower than that of the evaporator surface. We analyzed the unsteady temperature change and heat transfer performance of the flat heat pipe by numerical simulation. The analytical results showed that it was necessary to have two thermal switches to separate the heat energy and cold energy of the changing heat source. Also, it was important to reduce the thermal resistance and heat capacity of the evaporator surface to improve the unsteady heat transfer performance of the heat pipe. Next, we measured the unsteady heat transfer performance of the flat heat pipe experimentally. The experimental results showed that the thermal-switching behavior was observed when the heat generation of the heat source changed every 5 s.

Using the fuzzy multi-criteria model to select the optimal cool storage system for air conditioning

2008 ◽  
Vol 40 (11) ◽  
pp. 2059-2066 ◽  
Author(s):  
Jiang-Jiang Wang ◽  
Chun-Fa Zhang ◽  
You-Yin Jing ◽  
Guo-Zhong Zheng
Keyword(s):  
Air Conditioning ◽  
Storage System ◽  
Cool Storage ◽  
Optimal Cool

Thermodynamics and Economics of Different Asymmetric Cold Energy Transfer in a Liquid Air Energy Storage System

2020 ◽  
Vol 8 (5) ◽  
pp. 1901487 ◽  
Author(s):  
Luna Guo ◽  
Zhaozhao Gao ◽  
Wei Ji ◽  
Hao Xu ◽  
Liubiao Chen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Energy Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Cold Energy

URL ATTACKS: Classification of URLs via Analysis and Learning

2016 ◽  
Vol 6 (3) ◽  
pp. 980
Author(s):  
M. Rajesh ◽  
R. Abhilash ◽  
R. Praveen Kumar
Keyword(s):  
Social Networks ◽  
Link Analysis ◽  
User Needs ◽  
Learning Methods ◽  
Analysis Algorithm ◽  
Day By Day

Social Networks such as Twitter, Facebook play a remarkable growth in recent years. The ratio of tweets or messages in the form of URLs increases day by day. As the number of URL increases, the probability of fabrication also gets increased using their HTML content as well as by the usage of tiny URLs. It is important to classify the URLs by means of some modern techniques. Conditional redirection method is used here by which the URLs get classified and also the target page that the user needs is achieved. Learning methods also introduced to differentiate the URLs and there by the fabrication is not possible. Also the classifiers will efficiently detect the suspicious URLs using link analysis algorithm.

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