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International Journal of Thermal Engineering (IJTE)
Editor in chief:Dr. Ajeet Kumar Rai
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Browse by Volumes
Zero Electricity Air Conditioning Using Phase Changing Materials
Author:Akshansh Mishra, Anish Das Gupta, Amit Kumar Mandal And Anand Singh.
Volume: 4 | Issue no: 1-2016 | Pagination: 1-5
Summer is upon us, and complaints about the heat will soon be common in many places. But few places will reach the scorching temperatures residents of rural areas will experience, and air conditioning is simply not an option for most people living in rural areas. Zero Electricity Air Conditioning is an attempt to provide low cost air conditioning effect and is built from a common waste item: empty plastic soda bottles. To create this nifty cooling system, plastic bottles are cut in half and then mounted into a grid through bottlenecksized holes. The grid can be situated over a window with the narrower top end of the bottle facing inwards. When the wind blows through the bottles, cool air funnels into the hut. According to Eco-Cooler, this technique can decrease temperatures in the home by up to 5°C. Phase Changing Materials like paraffin and salt hydrates adds further supplements to this system.
Optimization Of The Design Of A Piezoelectrically Driven Thermoacoustic Refrigerator
Author:Rudrik V. Patel And Sanket K. Patel.
Volume: 4 | Issue no: 1-2016 | Pagination: 01-09
Thermoacoustic refrigeration is an emerging field of technology. This technology uses sound waves to pump heat across a temperature gradient and the sound waves are produced using a piezoelectric material. The design of a piezoelectrically thermoacoustic refrigerator are explained in detail. The effects of resonant frequency, resonator tube diameter, stack length, ambient temperature and working fluid have been studied. Graphs of the parameters' variation against the temperature gradient is plotted and maximum value is identified. Finally an optimum design is identified using the above results. Commercially thermoacoustic refrigerators are not in use, they are used only for research purposes. This paper aims at trying to obtain refrigeration effect without using any harmful refrigerants and without any moving parts through this piezoelectrically driven thermoacoustic refrigerator. Piezoelectric material usage reduces the overall cost since the alternative i.e. the electromagnetic speakers are comparatively expensive.
Squeeze Film Lubrication Of Finite Porous Partial Journal Bearing With Micropolar Fluids
Author:Monayya Mareppa,S. Santosh.
Volume: 3 | Issue no: 2-2015 | Pagination: 01-15
In this paper the general Reynolds type equation of finite porous partial journal bearing lubricated with micropolar fluid is solved numerically by using finite difference technique. The first order non-linear equation for time height relation is solved numerically with the given initial condition. From the numerical results obtained, it is observed that, the effect of micropolar fluid is to increases the film pressure, the load carrying capacity and to lengthen the squeeze film time as compared with Newtonian case. The reduction in load carrying capacity and the response time of porous partial journal bearings can be compensated by the use of lubricants with proper microstructure additives by which the bearing life can be increased.
Blood Flow Through Stenosed Inclined Tubes With Periodic Body Acceleration
Volume: 3 | Issue no: 1-2015 | Pagination: 1-8
This is about the mathematical model for blood flow through stenosed inclined tubes with periodic body acceleration. Here, velocity decreases with increase in radius. Flow rate with time at fixed inclination and stress with phase angle for fixed time are discussed.
Thermal Study Of Transfer In An Exchanger Made Up Of Two Cylindrical Tubes Placed In A Closed Enclosure
Author:Abraham Kanmogne, Jean Nganhou, Oumarou Hamandjoda
Volume: 2 | Issue no: 1-2014 | Pagination: 1-9
An experimental study is made to determine the thermal output by convection and radiation inside a closed enclosure, crossed by two cylindrical tubes.The objective of this study is to determine the quantity of energy necessary, then to model it for current applications (drying, solar collectors etc.). A quantity of dry biomass is burned in two interdependent hearths with two cylindrical tubes which crosses a closed enclosure. The determination of the quantity of energy emitted by radiation and convection in the closed enclosure and which constitutes the useful energy in the case of drying , accounts for 33% of the natural energy contained in the fuel (wood).
Time Domain Sound Spectrum Measurements In Ducted Axial Fan Under Stable Region At Throttle Position 7 Cm
Author:Manikandapirapu P.K. Srinivasa G.R. Sudhakar K.G. Madhu D.
Volume: 1 | Issue no: 1-2013 | Pagination: 1-9
Performance of axial fan is found to reduce drastically when instability is encountered during its operation. Performance of an axial fan is severely impaired by many factors mostly related to system instabilities due to rotating stall and surge phenomenon experienced during its operation. The present work involves measuring the time domain sound signal in ducted axial fan under stable region at throttle positions 7 cm from the casing. Objective of the experiment is to measure the time domain sound signal in terms of decibel and comprehend the sound Characteristics in ducted axial fan by using sound spectrum analyser. Different types of time domain sound signals have been measured under stable region at throttle position 7 cm from the casing for different rotor speed and different graphs are plotted for ducted axial fan.
Time Domain Sound Spectrum Measurements In Ducted Axial Fan Under Stall Region At Throttle Position 2 Cm
Author:Manikandapirapu P.K. Srinivasa G.R. Sudhakar K.G. Madhu D.
Volume: 1 | Issue no: 1-2013 | Pagination: 10-18
Performance of axial fan is found to reduce drastically when instability is encountered during its operation. Performance of an axial fan is severely impaired by many factors mostly related to system instabilities due to rotating stall and surge phenomenon experienced during its operation. The present work involves measuring the time domain sound signal in ducted axial fan under stall region at throttle positions 2 cm from the casing. Objective of the experiment is to measure the time domain sound signal in terms of decibel and comprehend the sound Characteristics in ducted axial fan by using sound spectrum analyser. Different types of time domain sound signals have been measured under stall region at throttle position 2 cm from the casing for different rotor speed and different graphs are plotted for ducted axial fan.
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