Table 2 all parameter data related to heat exchanger m v t v1 t v2 h fg s fg m c c pc t c1 t c2 exergy efficiency 215 346 316 2390. Cumulative exergy analysis of heat exchanger production. Energy and exergy analysis of a parallel and counterflow heat exchangers using measured data article pdf available in strojniski vestnik 533. Sep 29, 2016 analysis of heat exchanger by lmtd method prepared by. The term heat exchanger applies to all equipment used to transfer heat between two streams. This paper presents a failure analysis performed to investigate the leak of heat exchanger tubes. Failure analysis of heat exchanger tubes springerlink. Combining each of these resistances in series gives. Exergy llc 320 endo boulevard, garden city, ny 11530 phone. Space radiator a heat exchanger that transfers heat from the hot fluid to the surrounding space by radiation. R sekulib university of kentucky introduction a heat exchanger is a device that is used for transfer of thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a.
To analyse the heat transfer in concentric tube heat exchanger by comparing the simulation result to the analytical calculations. Jul 01, 2016 because the cooler fluid exists the counter flow heat exchanger at the end where the hot fluid enters the heat exchanger, the cooler fluid will approach the inlet temperature of the hot fluid. A finnedtube heatexchanger is a key component of an air handling unit for treating the temperature and humidness of air, the heat transferring performance of which influences the capability of treating air and supplying energy. It is the mostly common type of heat exchanger in oil refineries factory and other large chemical processes factory, and is suited for higherpressure applications. In cross flow heat exchangers, one fluid flows through tubes and second fluid passes around the tubes perpendicularly. Exergy analysis is a method that uses the conservation of mass and energy principles together with the second law of thermodynamics for the design and analysis of. Heat exchangers 73 individual thermal resistances of the system.
Air cooled heat exchanger it is tubular heat transfer equipment in which ambient air passes over the tubes and thus acts as the cooling medium. Costbased design optimization of the heat exchangers in a. Some studies have been published to research the performances of finnedtube heatexchanger, such. As the streams pass through a hx, the temperature of the hot flow decreases, and the temperature. Two important problems in heat exchanger analysis are i rating existing heat exchangers and ii sizing heat exchangers for a particular application. Chapter 5 heat exchangers faculty of engineering and. The inner tube is thinwalled and has a diameter of 1. Pdf exergy analysis of heat transfer in a turbulent pipe. Each stream may have a different mass flow rate and specific heat. The cold fluid water was pumped at a constant flow rate 17. Average overall heat transmission coefficients for some common fluids and surface combinations as water to air, water to water, air to air, steam to. There is no study on exergy analysis of shell and tube heat exchangers made of corrugated shell and corrugated tube. Heat exchanger is a process equipment designed for the effective transfer of heat energy between two fluids.
Contact heat exchanger for the utilisation of lowgrade energy sources. A unique compact arrangement of small diameter tubes results in a lightweight, cost effective design that is easily installed in space constrained areas. The hot fluid graphene oxide nf was provided by a controllable electrical heater. For the love of physics walter lewin may 16, 2011 duration. If the heat exchanger is located at the inlet or discharge of a blower with a pulsating flow, such as a roots type rotary lobe blower, the heat exchanger must be protected from the pulsation by a chambered silencer. Analysis of a counter flow parallelplate heat exchanger ruoxu jia, junling hu, and abubaker e. Heaters, coolers and heat exchangers are used to supply or recover heat in each process in the cycle. For the heat transfer to occur two fluids must be at different temperatures and they must come thermal contact. M elbalsohi, department of mechanical engineering university of bridgeport, bridgeport, ct, usa. Critical evaluation of an automated tool for heat exchanger network retrofits based on. Asee 2014 zone i conference, april 35, 2014, university of bridgeport, bridgeport, ct, usa. Analysis the heat exchanger specific to flow rate of hot and cold fluid. Seebeck effect, thermoelectric generator, heat exchanger, thermoelectric materials and bismuth telluride.
Types of heat exchangers the three main types of heat exchangers are, 1. As the streams pass through a hx, the temperature of the hot flow decreases. Alenergy and exergy analysis on shell and tube type heat exchanger international engineering of scientific engineering, june 20,volume 4, 22295518 2 hikmetesen, mustafa inalli energy and exergy analysis of a groundcoupled heat pump system with two horizontal ground heat exchangers. In this sense it makes no distinction between work and heat except to indicate a means of measuring each in terms of equivalent units. Pdf energy and exergy analysis of a parallel and counter. The flow in the heat exchanger is considered under steadystate and fully insulated at the outer surface.
As its name implies, this type of heat exchanger consists of a shell a large vessel. By investigating and calculating the energy consumption in the production process of heat exchangers, the cumulative exergy consumption of heat exchangers is obtained. Design and analysis of heat exchanger for automotive exhaust. Advanced exergy analysis of heat exchanger network in a. Heat transfer and exergy analysis of a spiral heat exchanger article pdf available in heat transfer engineering 3712 october 2015 with 1,848 reads how we measure reads. Overall heat transfer coefficients for some common fluids and heat exchanger surfaces.
Average overall heat transmission coefficients for some common fluids and surface combinations as water to air, water to water, air to air, steam to water and more. Once this technique of measurement is established, work and heat become entirely equivalent for all applications of the first law. The figure below shows the temperature profile along the direction of flow in parallel. Logarithmic mean temperature differencelmtd defination. Heat exchange involve convection in each fluid and. In an extende dsurface heat exchanger, heat transfer takes place from both the fins. Solar advisor model reference manual for csp trough systems. Two important problems in heat exchanger analysis are 1 rating existing heat.
The oil provides an average convection coefficient ho 400 wm2k on the outside of the tubes. Double pipe heat exchangers often also referred to as double pipes are characterized by a construction form which imparts a ushaped appearance to the heat exchanger. Performance analysis of shell and tube heat exchangers. Waste heat from two plant sites is currently delivered to the local district heating system. Identification, cost estimation and economic performance. Experimental exergy analysis for shell and tube heat exchanger made of corrugated shell and corrugated tube. Consider an infinitesimal part of the heat exchanging tube of area da, where temperatures of hot and cold fluid are th and tc, respectively.
However, the term is commonly used to equipment in which two process streams exchange heat with each other. A shell and tube heat exchanger is a which type of heat exchanger designs. If it is not, then an incremental analysis of the heat exchanger is required. The exergy destruction or irreversibility due to the heat transfer between hot and cold fluid streams in a heat exchanger is calculated by applying the second law analysis on the flow system. Design and analysis of heat exchanger for automotive. The study showed that energy can be tapped from engine exhaust. The use of exergy analysis or second law analysis is very important in developing a good understanding of the thermodynamic behavior of a heat exchangers thermal performance. Consider an infinitesimal part of the heat exchanging tube of area da, where temperatures of hot and cold fluid are t h and t c, respectively. The heating is to be accomplished by passing hot engine oil, which is at 160c, through the shell side of the exchanger. The figure below shows the temperature profile along the direction of flow in parallel flow and counter flow heat exchangers. According to awad 2011, these phenomena can be divided into.
May 18, 2018 the flow in the heat exchanger is considered under steadystate and fully insulated at the outer surface. Heat exchanger problem calculation lmtd and effectiveness. Exergy analysis of lbehelium heat exchanger in the. Analysis of heat transfer in an experimental heat exchanger using. The heat exchanger must be isolated from system vibrations using flexible piping connections and isolation pads on the mounting feet. Exergy loss or irreversibility in regioni air and fuel enters this sub region at atmospheric condition. Confirm complex heat exchanger performance bryan research. Exergy analysis of heat transfer in a turbulent pipe flow by a decaying swirl generator article pdf available in international journal of exergy 51 january 2008 with 293 reads. Seebeck effect, thermoelectric generator, heat exchanger, thermoelectric materials and. Pdf heat transfer and exergy analysis of a spiral heat. The objectives of the investigation are to identify the failure mechanism and possible contributing factors and suggest corrective actions to prevent reoccurrence of similar failure. The heating is to be accomplished by geothermal water available at 160c at a mass flow rate of 2 kgs. Density and viscosity can be determined by analysis.
A typical shell and tube heat exchanger with one shell pass and two tube passes as the two fluids in the heat exchanger that are at different temperatures, heat exchanger analysis and design therefore involve both convection and conduction. Chapter 5 compact heat exchnager analysis using nanofluids. According to the analysis above, when exergy losses of lbe and helium gas are the minimum value, the minimum value of exergy loss of heat exchanger is obtained, and that is the unavoidable exergy loss. For analysis boiler is divided in three sub region. A plate heat exchanger, phe, is a compact heat exchanger where thin corrugated plates some 0. A shellandtube heat exchanger must be designed to heat 2. The heat transfer of 50 kw and the heat transfer area are fixed. May 23, 2016 inlet and outlet boundary conditions for the analysis of shell and tube heat exchanger inlet and outlet conditions for hot fluid the hot water is entered at a temperature of 348 k, and different mass flow rates such as 0. In a heat exchanger, the exergy loss occurs mainly due to heat transfer between hot and cold streams. Thorough failure analysis showed that sulfur was obviously detected on both tube side surfaces od and id.
Table 1 shows the utilities used for heat recovery and process heating, together with the corresponding heat loads and amount of heat that has to be covered by external heat from the boilers q genq consumed approx. Application of second law analysis in heat exchanger. Exergy analysis of heat exchangers in the copperchlorine. Balanced counter flow heat exchanger assuming and cc, then the lmtd becomes undefined as. Logarithmic mean temperature difference is define as that temperature difference which,if constant,would give the same rate of heat transfer as actually. Heat transfer efficiency and capital cost evaluation of a. Exchanger inspection 101 visual inspection of shell and tube heat exchangers. To simulate heat transfer in concentric tube heat exchanger by using cfdfluent software. In a heat exchanger hx, thermal energy is transferred from a hot h fluid stream to a cold c fluid stream. Inlet and outlet boundary conditions for the analysis of shell and tube heat exchanger inlet and outlet conditions for hot fluid the hot water is entered at a temperature of 348 k, and different mass flow rates such as 0. This project work is based on design and thermal analysis of double pipe heat exchanger. A heat exchanger is a device in which energy is transferred from one fluid to another across a solid surface.
Exchanger analysis and design therefore involve both convection and conduction. A counterflow doublepipe heat exchanger is to heat water from 20c to 80c at a rate of 1. Heat exchangers are devices that provide the transfer of thermal energy between two or more fluid streams at different temperatures. Reason for heat exchangers a heat exchanger is a piece of equipment built for efficient heat transfer from one medium to. Heat exchangers air system airtoair sensible and latent effectiveness heat exchanger overview. The hot fluid was pumped into the tubes of the shellandtube heat exchanger at various rates using a variable frequency drive vfd instrument. Jul 08, 2016 report on failure analysis of shell and tube heat exchangers 1. Particulate fouling, taking place due to the accumulation of suspended particles in the fluid stream on the surface of the heat exchanger. Parametric analysis of heat exchanger thermal performance in. Author links open overlay panel hamed sadighi dizaji samad jafarmadar soheil asaadi. Exergy analysis of a shellandtube heat exchanger using. The inspection of heat exchangers is the one area of equipment inspection where i firmly advocate the use of a check list to make sure you got everything. Exergy analysis of heat transfer in buildings pdf free. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid.
Bejan 12, explained two contributions to exergy loss namely through heat transfer across finite temperature difference and through fluid. A sthe is the most common type of heat exchanger in oil re fineries and other large chemical processes, and is suited for higherpressure applications. The heat exchanger design is realized following tema standards and optimized using. Sensibleandlatent provides a model for a generic, sensible and latent airtoair heat exchanger that is an hvac air system component that consists of a heat exchanger and primarysecondary airflow bypass dampers. Numerical and heat transfer analysis of shell and tube. Asee 2014 zone i conference, april 35, 2014, university. Heat transfer and effectiveness analysis of a crossflow heat.
Identification, cost estimation and economic performance of. The corresponding heat requirements, recovered heat and other data for the heat exchangers at various transfer points are shown in table 2, where results are presented per mole of hydrogen. As described above, most of the works focused on thermal characteristics of corrugated tubes and employing corrugated tube as the only inner tube of a shell and tube heat exchanger. Pinch analysis, matrix method, retrofit, heat exchanger network, stream splits. Air is available in unlimited quantities compared to water.
Heat exchanger is the equipment which is used to reduce temperature of one process fluid, which is desired to cool, by transferring heat to another fluid which is desired to heat with or without intermixing the fluid or changing the physical state of the fluid. Experimental exergy analysis for shell and tube heat. In this chapter, an analysis of convection heat transfer in an experimental heat exchanger using experimental data and numerical simulation data by means. The step by step procedure for determination of overall heat transfer coefficient are described below. Numerical and heat transfer analysis of shell and tube heat.