The local two-phase heat transfer coefficient is a critical parameter in the design of microchannel cold plate evaporators used in applications such as electronics cooling systems. Only a few past studies on microchannels have investigated the heat transfer characteristics over the entire vapor quality range and conflicting trends have been reported even in these studies. Therefore, the present...

Experimental investigation on the performance of dual-evaporator refrigeration system with an ejector has been carried out In this study, HFC-134a is chosen as a working fluid. Test setup is composed of compressor, condenser, expansion valves, two evaporators, and ejector which is installed between two evaporators. The condenser and two evaporators are made as concentric counter-flow type heat ...

The aim of this study is to evaluating an Organic Rankine Cycle (ORC) system from diesel engine waste heat recovery by selecting three different working fluids with pressure and temperature condition. fluid include N-Pentane, R-245fa, R-134a are conditioned on variations in evaporation a difference 0.5 bar 5 °C achieve the best thermal efficiency. proposed evaluation involved two phases, first ...

A fully equipped automotive air-conditioning test system consists of 5 main components: a compressor, a condenser, an orifice tube, an evaporator and an accumulator. R-134a is used as refrigerant. The coefficient of performance, evaporator cooling capacity, compressor power consumption, total mass flow rate, vapor mass flow rate, liquid mass flow rate and oil in circulation, pressures and tempe...

The BaBar detector has operated over 200 2nd generation Resistive Plate Chambers (RPCs) in the forward endcap since 2002. Many chambers have increased noise rates and high voltage currents. These aging symptoms are correlated with the integrated RPC current as expected, but also depend on the rate and direction of the gas flow, indicating that pollutants produced in the gas can accelerate aging...

مبرد در کتاب خود (الکامل) به شعر اهمیت فراوانی می­دهد. روایت شعر و اسناد آن نزد او از اهمیت فراوانی برخورداراست. او بر این باور است که کاستی و فزونی و اختلاف در روایت­ شعر تأثیر فراوانی بر معنی آن دارد. نویسنده در کتاب خود به متون شعری، به ویژه تحلیل­های زبان ­شناختی آن توجه بیشتری دارد و تنها رویکردی زبان ­شناسانه به شعر نداشته بلکه رویکرد زیبایی­شناسانه و نقدی ر...