Plate heat exchanger applications general heating and cooling duties. The basic designs for heat exchangers are the shellandtube heat exchanger and the plate heat exchanger, although many other configurations have been developed. The overall heat transfer characteristics of a double pipe heat exchanger. You can simulate the plate heat exchanger perfect for your needs, any time of the day, from. Double pipe heat exchanger one fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. If the overall heat transfer coefficient is expected to be 1. Background a heat exchanger is a heat transfer device whose purpose is the transfer of energy from one moving fluid stream to another moving fluid stream. Guidelines for the safe design and operation of shell and. In this paper the heat pipe heat exchanger hphe is presented as a new and very attractive heat exchanger type. It is called a double pipe exchanger because one fluid flows inside a pipe and the other fluid flows between that pipe and another pipe that surrounds the first. The effectiveness of an airtoair heat pipe heat exchanger is the ratio of the energy transferred versus the maximum possible amount of energy that could be transferred for the conditions that it is exposed.
What is heat pipe working of heat pipe exchanger for. Heat pipes in modern heat exchangers sciencedirect. Its widely used in chemical, energy, machinery, transportation, refrigeration, air conditioning and aerospace fields. Hisaka websimulator hws plate heat exchanger this is the. Heat pipe heat exchanger energy recovery systems offer both cost and performance benefits over traditionally available heat exchanger technologies. Pdf heat pipes are very flexible systems with regard to effective thermal control. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid temperature greater than the coldest hotfluid temperatue. Chapter 5 heat exchangers faculty of engineering and. The purpose is to utilise the cooling effect, utilise which without a heat exchanger is otherwise lost to the ambient air via uninsulated suction lines. Explains the detailed heat exchanger method in aspen plus.
Heat transfer heat exchanger types of heat exchangers. The plate pack is assembled between a fix frame plate and. 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. A heat pipe heat recovery heat exchanger for a minidrier. Counter flow heat exchangers are the most efficient of the three types.
Heat pipe heat exchanger heat exchanger, which transfers the heat from one medium to another, is the most common thermal equipment in various of industry sectors. With a temperature range of heat recovery now encompassing 50c to 2500c, our heat pipe heat exchangers have the capacity to fulfill most heat transfer requirements. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. Space radiator a heat exchanger that transfers heat from the hot fluid to the surrounding space by radiation.
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. Hot water flows through the inner annular space in opposite direction to that of the cold water streams. Reason for heat exchangers a heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another hot and cold fluid. Finned tubes and pipes heat exchangers engineers edge. Heat exchangers jordan university of science and technology. The singlephase flow and thermal performance of a double pipe heat exchanger are examined by. Heat pipe heat exchanger on sales quality heat pipe heat.
Heat pipe heat exchanger for heat recovery in air conditioning. Airtoair heat pipe heat exchanger hpaahx selection tool. Different types of heat exchangers in addition, the overall heat transfer equation for the exchanger must be solved simultaneously. The major considerations and assumptions made for sizing of triple concentric pipe heat exchanger are as follows. Our heat pipe heat exchangers featuring thermosyphon technology that has been shown to transfer heat up to 10,000 times faster than other heat exchanger technologies allowing for a greater thermal energy transfer on a kw or btu recovery basis leading to near isothermal capabilities.
Therefore, it can not be classified as a compact heat exchanger. A heat exchanger is a system used to transfer heat between two or more fluids. According to flow layout, heat exchangers are grouped in. Since the end of the 1970s there are some publications related to heat pipe heat exchangers. A wide variety of heat exchanger pipe options are available to you, such as seamless, welded. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat.
For sensible only devices like heat pipe heat exchangers, the effectiveness is typically reported as temperature effectiveness. Towards an optimal design of heat pipe equipped heat exchangers. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. However, the term is commonly used to equipment in which two process streams exchange heat with each other. This page provides a tabulation of the standard shell and tube pipesizes. Modeling of the heat pipe heat exchangers for heat recovery. The heat exchanger must be isolated from system vibrations using flexible piping connections and isolation pads on the mounting feet. In this paper a computer simulation was developed by matlab to design the heat pipe heat exchangers. Calculates the length of a concentric counterflow heat exchanger using the same parameters as in sizing a heat exchanger. The heat pipe heat exchangers are used in heat recovery applications to cool the incoming fresh air in air conditioning applications. Engineering page heat exchangers standard pipe sizes. Amsenergy supplies our clients with the most efficient style of heat pipe heat exchangers available. Heat pipe is a selfcontained passive energy recovery device.
Standard design the plate heat exchanger consists of a pack of corrugated metal plates with portholes for the passage of the two fluids between which heat transfer will take place. The working fluid used was r4a and the correlations are given for the evaporator and condenser inside. In the first part of the paper a presentation of the modelization of the hphe is given, in the second part some technologocal considerations are developped and in the third part two exemples of industrial applications are described. The heat pipe heat exchanger used for gasgas heat recovery is. Types of heat exchangers the simplest type of heat exchanger consists of two concentric pipes of different diameters, as shown in figure 1, called the doublepipe heat exchanger. Combining each of these resistances in series gives. The heat pipe or twophase thermosyphon device is an important concept in heat exchangers, which can be used in different branches of industry such as. Lesson30 numerical problems related to heat exchanger. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117. A heat pipe can transfer up to times more thermal energy, than copper, the best known conductor.
This program can be considered as a simple tool for modeling and designing heat pipe heat exchangers. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. The overall heat transfer characteristics of a double pipe. Heat exchangers have widespread industrial and domestic applications. Two cold water streams cooling medium flow through central pipe and outer annular space in same direction. The heat exchange duty a llows calculation of the log mean. The closed two phase thermosyphon a heat pipe without a capillary wick structure is defined as a thermosyphon. To understand the basic operation of heat exchangers. Tubeintube heat exchanger type he tubeintube heat exchanger type he is used primarily for heat transfer between the liquid and suction lines of the refrigeration plant. The double pipe exchanger is used when one liquid has a greater resistance to heat flow than another r when the surface area is small. Heat exchangers are used in both cooling and heating processes.
One fluid in a doublepipe heat exchanger flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. 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, at different temperatures and in thermal contact. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. Finned pipe and tubes are used within shell and tube type heat exchangers to enhance the heat transfer between the inside of the heat exchanger tube or pipe, and the outside. Two streams of fresh and return air have been connected with heat pipe heat exchanger to investigate the thermal performance and effectiveness of heat recovery system. Finned pipes and tubes are commercially available in various sizes and materials. Access the url below and click on the websimulator icon. Figure 5 illustrates the spiral exchanger configuration. The term heat exchanger applies to all equipment used to transfer heat between two streams. Heat exchangers 73 individual thermal resistances of the system. The double pipe heat exchanger is one of the simplest types of heat exchangers. Heat transfer 1 heat exchangers heat transfer heat exchanger types of heat exchangers heat exchangers are classified according to flow arrangement and type of construction. Design of small heat exchanger double pipe type mohamad shafiq bin alias thesis submitted in fulfillment of the requirements for the award of the degree of.
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