Surface Differential Scanning Calorimeter for Evaluation of Evaporative Cooling Efficiency

2012 ◽  
Vol 7 (2_suppl) ◽  
pp. 155892501200702
Author(s):  
Ruslan Burtovyy ◽  
Binyamin Rubin ◽  
Mahmut O. Kesimci ◽  
Igor Luzinov ◽  
Jeffery Owens ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Differential Scanning Calorimeter ◽  
Low Cost ◽  
Evaporative Cooling ◽  
Cooling Power ◽  
Cooling Efficiency ◽  
Temperature Decrease ◽  
Heating Systems ◽  
Quantitative Analyses ◽  
Transfer Properties

We developed a Surface Differential Scanning Calorimeter for the quantitative analyses of thermodynamic and heat transfer properties of thin fibrous and porous samples. It has been demonstrated that the calorimeter is capable of measuring cooling power as well as temperature decrease in a reliable and reproducible way. Considering its low cost the equipment can be a valuable option for studying cooling/heating systems in laboratory settings.

An Investigation of the Unstable Oscillation Phenomenas of Two-Phase Closed Thermosyphon

2013 ◽  
Vol 668 ◽  
pp. 608-611 ◽  
Author(s):  
F.Z. Tian ◽  
Gong Ming Xin ◽  
Xin Yu Wang ◽  
Lin Cheng
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Experimental Investigation ◽  
Temperature Fluctuation ◽  
Low Cost ◽  
Cooling Power ◽  
Two Phase ◽  
High Heating ◽  
Sample Structure ◽  
Unstable Oscillation

Two-phase closed thermosyphon has been widely used in many heat transfer devices due to its high thermal conductivity, low cost and sample structure. During its starting and operation, there have some unstable oscillation, including dry oscillation, geyser boiling and carrying oscillation. An experimental investigation of unstable oscillation of two-phase closed thermosyphon was presented in the present paper. The experimental results showed that under the same starting power, geyser boiling is easy to achieve stability with the cooling power increasing, and under the same cooling power condition, geyser boiling could be significantly affected by the starting power. At the situation of high heating power, carrying oscillation happened easily, which caused great temperature fluctuation and disastrous effects on the heat pipe.

Experimental Research on Direct Evaporative Cooling of Stainless Steel Filler

2014 ◽  
Vol 472 ◽  
pp. 226-230
Author(s):  
Xiao Wen Sheng ◽  
Huang Xiang
Keyword(s):  
Heat Transfer ◽  
Stainless Steel ◽  
Transfer Coefficient ◽  
Experimental Research ◽  
Evaporative Cooling ◽  
Cooling Efficiency ◽  
Empirical Formulas ◽  
Volumetric Heating ◽  
Direct Evaporative Cooling ◽  
Air Resistance

In this paper the experimental research on direct evaporative cooling (DEC) using stainless steel was carried out.The effect of factors that affect cooling efficiency, filler resistance and volumetric heating transfer coefficient. In order to provide reference for the design for use and analysis of DEC, empirical formulas for coefficient of heat transfer and air resistance were established.

scholarly journals Experiments on Energy-Efficient Evaporative Cooling Systems for Poultry Farm Application in Multan (Pakistan)

2021 ◽  
Vol 13 (5) ◽  
pp. 2836
Author(s):  
Khawar Shahzad ◽  
Muhammad Sultan ◽  
Muhammad Bilal ◽  
Hadeed Ashraf ◽  
Muhammad Farooq ◽  
...  
Keyword(s):  
Heat Stress ◽  
Low Cost ◽  
Evaporative Cooling ◽  
Thermal Exposure ◽  
Climatic Conditions ◽  
The Body ◽  
Dew Point ◽  
Sweat Glands ◽  
Cooling Systems ◽  
Humidity Index

Poultry are one of the most vulnerable species of its kind once the temperature-humidity nexus is explored. This is so because the broilers lack sweat glands as compared to humans and undergo panting process to mitigate their latent heat (moisture produced in the body) in the air. As a result, moisture production inside poultry house needs to be maintained to avoid any serious health and welfare complications. Several strategies such as compressor-based air-conditioning systems have been implemented worldwide to attenuate the heat stress in poultry, but these are not economical. Therefore, this study focuses on the development of low-cost and environmentally friendly improved evaporative cooling systems (DEC, IEC, MEC) from the viewpoint of heat stress in poultry houses. Thermodynamic analysis of these systems was carried out for the climatic conditions of Multan, Pakistan. The results appreciably controlled the environmental conditions which showed that for the months of April, May, and June, the decrease in temperature by direct evaporative cooling (DEC), indirect evaporative cooling (IEC), and Maisotsenko-Cycle evaporative cooling (MEC) systems is 7–10 °C, 5–6.5 °C, and 9.5–12 °C, respectively. In case of July, August, and September, the decrease in temperature by DEC, IEC, and MEC systems is 5.5–7 °C, 3.5–4.5 °C, and 7–7.5 °C, respectively. In addition, drop in temperature-humidity index (THI) values by DEC, IEC, and MEC is 3.5–9 °C, 3–7 °C, and 5.5–10 °C, respectively for all months. Optimum temperature and relative humidity conditions are determined for poultry birds and thereby, systems’ performance is thermodynamically evaluated for poultry farms from the viewpoint of THI, temperature-humidity-velocity index (THVI), and thermal exposure time (ET). From the analysis, it is concluded that MEC system performed relatively better than others due to its ability of dew-point cooling and achieved THI threshold limit with reasonable temperature and humidity indexes.

Boiling Heat Transfer Properties of Copper Surface with Different Microstructures

2021 ◽  
pp. 124589
Author(s):  
Liying Wang ◽  
Yonghua Wang ◽  
Wen Cheng ◽  
Huadong Yu ◽  
Jinkai Xu
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Copper Surface ◽  
Transfer Properties

Photothermal and Heat-Transfer Properties of Aqueous Detonation Nanodiamonds by Photothermal Microscopy and Transient Spectroscopy

2021 ◽  
Vol 125 (14) ◽  
pp. 7808-7823
Author(s):  
Mikhail A. Proskurnin ◽  
Liliya O. Usoltseva ◽  
Dmitry S. Volkov ◽  
Dmitry A. Nedosekin ◽  
Mikhail V. Korobov ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Detonation Nanodiamonds ◽  
Photothermal Microscopy ◽  
Transient Spectroscopy ◽  
Transfer Properties

A Control-Oriented Polytropic Model of SI Engine Intake Manifold

2003 ◽  
Author(s):  
Josˇko Deur ◽  
Davor Hrovat ◽  
Josˇko Petric´ ◽  
Zˇeljko Sˇitum
Keyword(s):  
Heat Transfer ◽  
Intake Manifold ◽  
Simple Extension ◽  
Si Engine ◽  
Polytropic Model ◽  
Back Flow ◽  
Thermal Transients ◽  
Three State Model ◽  
Transfer Properties ◽  
Variant Structure

The paper presents experimental results which show significant changes of the intake manifold air temperature during fast tip-in/tip-out engine transients. An adequate two-state polytropic manifold model is developed and experimentally validated. An emphasis is on the derivation and parameterization of a time-variant structure of the heat transfer coefficient. The polytropic manifold model is extended to a three-state form for the more general case of different heat transfer properties for the manifold plenum and runners. An influence of the engine back flow on the runner thermal transients is observed. A simple extension of the three-state model with the back flow effect is proposed.

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