ABSTRACT A Heat Exchanger is a device use for the heat transfer from one fluid to another, whether the fluids are separated by a solid wall so that they never mix or the fluids are directly in contact. The heat exchanger is widely used in different industries such as process, petroleum refining, chemicals and paper, power generation, chemical processing, A.C, refrigeration, and a food processing applications. Etc. Various Enhancement methods are used to increase performance of heat exchanger such as
Heat Exchangers 5.1 Introduction Heat exchangers are devices used to transfer heat between two or more fluid streams at different temperatures. Heat exchangers find widespread use in power generation, chemical processing, electronics cooling, air-conditioning, refrigeration, and automotive applications. In this chapter we will examine the basic theory of heat exchangers and consider many applications. In addition, we will examine various aspects of heat exchanger design and analysis. 5.2 Heat Exchanger
1.1 GENERAL As in any application there is fluctuation in heat load, this fluctuation affects optimal values of efficiency which causes decrement in system's overall efficiency. 1.2 HISTORY AND BACKGROUND Heat exchangers are equipments that ease the exchange heat between two fluids which are at different temperatures while keeping them apart from mixing with each other. Heat exchangers in their purest sense have been around for as long as man has been cooking in pots and ovens. To understand this
mechanical ventilating fan which was the very first of its kind. The cycle that air goes through before it enters your home is called the Refrigeration Cycle. The definition of the refrigeration cycle is; a sequence of thermodynamic processes whereby heat is withdrawn from a cold body and expelled to a hot body. The refrigeration cycle is composed of nine different equally important components which are: two fans, a liquid line, a suction line, a compressor, a condenser, an evaporator coil, a metering
One of the happiest moments in my life was when I cleared my engineering entrance test, and got an admit at PES Institute of technology for Bachelor’s in Mechanical. Having been part of this institution has given me a strong foundation in Core Mechanical subjects such as Dynamics and Kinematics of Machines, Solid and Fluid Mechanics, Thermodynamics, Manufacturing Sciences and Vibrations. It was my dream to be a mechanical engineer since the time I experimented with a Simple Pendulum in my high school
Warmers were popular in Europe during the mid 18th and early 19th centuries. Commonly known as a food warmer or veilleuse, they served as both a nightlight and container to heat food. Warmers typically stood between nine to twelve inches tall, but widths varied based on overall design. Throughout their existence, warmers evolved to accommodate regional differences and changes in use. Depending on the region, warmers included either a covered bowl or separate liner. Around the 19th century, some
used to design a heat exchanger networks (HEN) that reduce the energy usage. This paper will be about brief introduction for the pinch analysis, application of the second law of thermodynamics in design heat exchanger network Pinch Analysis: Pinch technology is the technology that provides a systematic methodology for energy saving in processes and total sites. The methodology is based upon first low and second low of thermodynamic. Applying Pinch technology to heat exchanger network HEN synthesis
analysis on heat pump. (J. U. Ahamed, 2011) It showed in study on prospect of hydrocarbon based on exergy analysis in vap... ... middle of paper ... ... air pumping device (such as blower or axial flow fan) is across the tube bundle which may be either forced draft or induced draft as shown in the Figure 2.2. A support structure that high enough to allow air to enter beneath the air cooled heat exchanger. 2.4.3 Shell and tube heat exchanger Figure 2.3 Shell and tube heat exchanger From the Figure
1.1 Background of study A diffuser is a mechanical device that is designed to control the character of fluid at the entrance of a thermodynamic open system. It could be in the shape of round, rectangular and square. Diffusers are commonly used in heating, ventilation, and air-conditioning systems as a part of room air distribution subsystem, and serve several purposes as following, to deliver conditioned and ventilated air evenly, to distribute the flow of air in the desired directions, to create
thermodynamic cycle which is designed to use both heating and cooling functions. A thermodynamic HP cycle transfers heat from one reservoir (air) to another reservoir (water). There are four components of a HP which are evaporator, compressor,condenser, and expansion valve. The evaporator is a device like heat exchanger situated in the first reservoir. This evaporator makes possible heat from first reservoir in order to be transferred to a cold low pressure refrigerant. This heated refrigerant flows
vapour then passes through condenser and gets converted into high pressure liquid. The heat produced from the condenser is dissipated to the external atmosphere with the help of a condenser fan. 3. The high pressure liquid refrigerant passes through the expansion valve and becomes a low temperature,
Heat indulgence techniques are the prime concern to remove the waste heat produced by Electronic Devices, to keep them within permitted operating temperature limits. Heat indulgence techniques include heat sinks, fans for air cooling, and other forms of cooling such as liquid cooling. Heat produced by electronic devices and circuitry must be self-indulgent to improve reliability and prevent premature failure. Integrated circuits such as CPUs, chipset, graphic cards, and hard disk drives are susceptible
Introduction: The Stirling engine has huge potential to be applied for converting heat into the mechanical work among a high thermal efficiency. Its thermal efficiency might be as high as the Carnot efficiency. The Stirling engine is an external combustion engine and it can be powered by various heat sources and waste heat. It is a simple type of external-combustion engine so it can be uses a compressible fluid as a working fluid. The thermal limit for the operation of a Stirling engine depends on
harnessing the heat energy. This heat is formed underground and is created by the radioactive decay of certain elements such as potassium, thorium, and uranium in Earth. One way to produce energy from geothermal heat is to use the heat to create steam to drive turbines that spin an electric generator, this method and others like it can create about 1,400,000 terawatt-years roughly three times the world’s annual consumption(Lund 2014). Geothermal heating and cooling is doing through a geothermal heat pump,
well since it does not need to be closed up. This way the need to find a geyser would not be needed since there is energy that exists. Setting up the plant is not much different from a normal coal power plant. The advantage is that it uses energy from heat from the earth which also give it more
heating system is a system designed to heat water using energy from the sun. The most common and cost efficient type of solar system installed in Ireland is used to heat domestic hot water but a system can also be designed to contribute some heat to the central heating (Though this will not suit every situation) [3]. How solar water heating system works A special liquid is circulated through the solar panel (which collects the solar energy) and transfers this heat energy to the liquid. The solar panels
Introduction South Africa in most recent times has been plagued by an energy crisis. Due to the high energy demands placed on Eskom, it has been unable to cope with this high demand for energy and therefore unable to meet the energy demands of the domestic consumer. This has consequently led to unplanned power outages and scheduled load shedding by Eskom to ease the load demand. This is an obvious inconvenience for the citizens, it is therefore in their own best interest to assist in resolving the
The thermal performance of a heat exchanger depends upon various parameters like inlet temperature of a hot fluid, type of hot fluid, type of cold fluid, shape of baffles, material of baffles, baffles angle and property of ribs. Basically fluid flow and heat transfer characteristics are largely depends upon the Reynolds number (Re). Reynolds number is basically the ratio of inertia force to viscous force. Re is only the factor by which we can decide whether the fluid is laminar or turbulent in shell
A low pressure, low temperature liquid is converted to vapor in the evaporator, thus absorbing heat from the refrigerated space and keeping that space cool. The fluid is driven around the cycle by the compressor, which compresses the low temperature, low pressure vapor leaving the evaporator to high pressure, high temperature vapor. That vapor is condensed to liquid in the condenser, thus giving off heat at a high temperature to the surrounding environment. Finally, the high pressure, high temperature
Introduction: 2.1. Heat transfer: Heat transfer is the science that pursues to foresee the energy transfer that may take place among material bodies as an outcome of a temperature difference. Thermodynamics explains that this energy transfer is described as heat. The science of heat transfer pursues not only to explain how heat energy may be transfer, but also to foresee the rate at which the exchange will take place under certain quantified conditions. The fact that a heat-transfer rate is the