نتایج جستجو برای: heat exchangers

تعداد نتایج: 203781  

2014
Alexander Michel Andreas Kugi

Compact heat exchangers have a wide range of applications where standard control strategies typically rely on the knowledge of the heat transfer model and thus on the overall heat transfer coefficient. In particular for compact plate heat exchangers, the overall heat transfer coefficient strongly varies with the manufacturer’s plate design and has to be identified by means of extensive measurem...

Journal: :energy equipment and systems 0
ali reza yousefnejad department of mechanical engineering, najafabad branch, islamic azad university, najafabad, iran mohammad mahdi heyhat faculty of mechanical engineering, tarbiat modares university, tehran, iran amir homayoun meghdadi department of mechanical engineering, najafabad branch, islamic azad university, najafabad, iran

the present study investigated the effect of distilled-water/ silver nanofluid on heat transfer in a closed cooling system of one of the electrical energy generation units at isfahan power plant. the difference between this study and previous researches refers to silver properties which have a high thermal conductivity and is non-toxic, hydrophilic and eco-friendly. distilled water/ silver nano...

1998
K. C. LEONG

A software for the thermal and hydraulic design of shell and tube heat exchangers with flowinduced vibration checks has been developed in a Windows-based Delphi programming environment. Its user-friendly input format and excellent colour graphics features make it an excellent tool for the teaching, learning and preliminary design of shell and tube heat exchangers. Design methodology is based on...

2014
Liping Liu Anthony M. Jacobi Liping LIU Anthony M. JACOBI

An experimental study is conducted to investigate condensate drainage and retention and the attendant thermalhydraulic effect associated with changes in surface hydrophilicity on air-conditioning evaporators. Three heat exchangers that have controlled wettability covering a range of contact angles and a baseline untreated aluminum heat exchanger are tested. Results from dynamic dip-testing as w...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2005
mohammad hassan panjeh shahi majid amidpour hossein ahmadi danesh

at many circumstances, in heat exchange processes several exchangers were used with different cost laws due to their pressure ratings, materials of construction and exchange3r types. in such circumstances traditional methods of pinch technology can not be led to minimum total annual cost may cause some other disadvantages like more complexity or higher maintenance. in this research work a new a...

2002
Markus Schaller Karl Heinz Hoffmann Ricardo Rivero Bjarne Andresen Peter Salamon

A distillation column with the possibility of heat exchange on every tray (a fully diabatic column) is optimized in the sense of minimizing its total entropy production. This entropy production counts the interior losses due to heat and mass flow as well as the entropy generated in the heat exchangers. It is observed that the optimal heating distribution, i.e. the heat exchange required on each...

2017
H. Carlsen

The efficiency of the ideal stirling cycle assumes, that the cylinder volumes are isothermal and that the temperatures in the cylinder volumes are identical to the temperatures in the heat sink and the heat source. The efficiency is then identical to the efficiency of the Carnot cycle. However, in a real stirling machine the cylinder volumes are nearly adiabatic instead of isothermal, and the h...

Babak Ghaem Panah Hassan Shokouhmand Mohammad Ali Nazari Mohammad Reza Aligoodarzi

In this paper the effect of site conditions, which are Altitude, Temperature and Relative Humidity and also Heat Dissipation Capacity are investigated on the optimized design of natural draft dry cooling towers with specific kind of heat exchangers, known as Forgo T60 type. A genetic algorithm program has been developed for optimized design of these cooling towers. Objective function includes b...

Journal: :journal of computational applied mechanics 0
seddigheh jalilirad department of mechatronics engineering, college of engineering, south tehran branch, islamic azad university, tehran, iran mohammad hassan cheraghali department of mechatronics engineering, college of engineering, south tehran branch, islamic azad university, tehran, iran hossein ahmadi danesh ashtiani department of mechatronics engineering, college of engineering, south tehran branch, islamic azad university, tehran, iran

the paper studies optimization of shell-and-tube heat exchangers using the particle swarm optimization technique. a total cost function is formulated based on initial and annual operating costs of the heat exchangers. six variables – shell inside diameter, tube diameter, baffle spacing, baffle cut, number of tube passes and tube layouts (triangular or square) – are considered as the design para...

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