Where is there an introduction to the design method of heat exchanger I urgently need it.

Key point 1 of purchasing heat exchangerThere are many types of heat exchanger models, which need to be decided according to the actual working conditions and applications. When Jiangsu Changsheng provides users with heat exchange solutions, it will carry out technical exchanges, such as when the flow rate is large and the pressure drop is small, you can choose the plate heat exchanger model with less resistance, and vice versa.

Especially when choosing a stainless steel plate type all-welded plate heat exchanger, it is necessary to carefully measure the temperature and other parameters, and try to meet the long-term stable trial of the appropriate model. 2.The selection of flow channel and process is a group of parallel flow channels in the same flow direction of a medium in the heat exchanger equipment, and similar plates constitute the flow channel of the medium.

The user can select the stream based on the calculation of the parameters....

The design steps of the heat exchanger are:Select the manufacturing materials and grades of heat exchange equipment, test the chemical composition of the materials, and orthopedic the steel plate after the mechanical properties are qualifiedMethods include manual orthopedics, mechanical orthopedics, and flame orthopedics.

The process is:Material preparation, marking, cutting, edge processing (flaw detection), forming, assembly, welding, welding quality inspection, assembly and welding. Stress test quality inspectionRaw materials are inspected not only before manufacturing, but also at all times during the manufacturing process.

The structural composition of the heat exchanger is relatively simple, mainly composed of plates, gaskets, fixed hold-down plates, movable hold-down plates, guide rods, clamping studs and nuts, pillars, middle spacers and other parts.

Precautions: 1. Keep the pipe network clean. The network must be cleaned both before and after work to avoid blockages in the heat exchanger. It is also necessary to pay attention to the cleaning of the dirt remover and filter in time to make the whole work complete smoothly.

2. Strictly control the softened water. It is very important to check the water quality, under the premise of treating the demineralized water quality, we must first carefully check the water quality problems of the water and softening tank in the system, and only after confirming that it is qualified can we inject the treatment.

3. New system inspection. For some new systems, it is not possible to immediately interchange with the heat exchanger, first of all, the new system needs to be run for a specified period of time, so that it has a mode of operation, and then the heat exchanger can be incorporated into the system for use, the purpose of which is to avoid impurities in the pipe network from damaging the heat exchanger equipment.

1. Process calculation.

According to the properties of the material and the requirements of the inlet and outlet pressure and temperature changes, the heat exchange coefficient of the pre-selected material in the material is comprehensively selected to calculate the heat exchange area that needs to be heat exchanger.

2. Mechanical calculations.

Select the appropriate heat exchanger form according to the characteristics of the material

1. Pre-assume the nominal diameter of the heat exchanger.

2. Select the size of the tube.

3. Pipe routing. 4. Calculate the length of the heat exchange tube.

5. Evaluation, if the ratio of the length and diameter of the tube bundle is appropriate, it will be finalized, otherwise it will be re-assumed according to the results 6. Strength calculation.

7. Drawing.

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The design steps of the pro-regenerative heat exchanger are as follows: 1. The process calculation is based on the properties of the material and the requirements of the inlet and outlet pressure and temperature changes, and the heat exchange coefficient of the pre-selected material in the material is comprehensively calculated to calculate the heat exchange area that needs to be heat exchanger. 2. Mechanical calculation to select the appropriate heat exchanger form according to the characteristics of the material

1. Pre-assume the nominal diameter of the heat exchanger 2, select the size of the tube 3, lay the pipe 4, calculate the length of the heat exchanger tube 5, evaluate, the ratio of the length of the tube bundle to the diameter is appropriate, otherwise it will be re-assumed according to the results 6, strength calculation 7, and the drawing hopes that my can help you <>

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Regenerative heat exchanger design steps.

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The design steps of the regenerative heat exchanger are as follows: 1. The process calculation is based on the properties of the material and the pressure and temperature changes of the inlet and outlet of the heat exchanger, and the heat exchange coefficient of the pre-selected material in the material is comprehensively calculated to calculate the heat exchange area of the heat exchanger. 2. Mechanical calculation to select the appropriate heat exchanger form according to the characteristics of the material

1. Pre-round which assumes the nominal diameter of the heat exchanger 2, selects the size of the tube 3, lays the pipe 4, calculates the length of the heat exchanger tube 5, evaluates, and the length of the tube bundle is appropriate if the ratio is appropriate, otherwise it will be re-assumed according to the results 6, strength calculation 7, and the drawing hopes that I can help you <>

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How to determine the size of the plate-fin heat exchanger unit.

Factor size determinationWhen designing a plate-fin heat exchanger, the unit size of the heat exchanger should first be determined according to the given conditions, and this decision mainly depends on the allowable pressure drop of the fluid and the temperature difference between hot and cold fluids. For pressure drop, the allowable pressure drop of the low-pressure gas should be used as a condition for determining the size of the heat exchanger bumper unit. Because for fluids with higher pressures, the pressure loss can be a little larger, while for low-pressure gases, the pressure loss requirements are stricter.

In the design, the appropriate fluid velocity should be selected according to the allowable pressure drop, so that the pressure drop achieved by the design result is as close as possible to the allowable pressure drop, so that the unit size will not be too large, the equipment investment can be saved, and the actual process operation will not be affected by the first discussion. There are certain limitations on the temperature difference between the hot and cold fluids of the plate-fin heat exchanger. The upper limit of the temperature difference at the same end of the heat exchanger must be less than 200 scatters, and the lower limit of the temperature difference at the same end is of course, so that a small lower limit can only be obtained by proper distribution of fluids).

The ideal temperature difference range in the process design is 2 50 °C.

A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. Heat exchangers play an important role in the production of chemicals, petroleum, power, food and many other industries. The following introduces the principle of heat exchanger for reference.

First, the working principle of the heat exchanger pin opener

The relative flow direction of the fluid in the heat exchanger is generally two types: forward flow and counterflow. When flowing downstream, the temperature difference between the two fluids at the inlet is the largest, and gradually decreases along the heat transfer surface to the smallest temperature difference at the outlet. In the case of counterflow, the temperature difference between the two fluids along the heat transfer surface is more uniformly distributed.

Under the condition that the inlet and outlet temperatures of the cold and hot fluids are constant, when there is no phase change between the two fluids, the average temperature difference of the counterflow is the largest and the downstream is smallest.

Under the condition of completing the same heat transfer, the average temperature difference can be increased and the heat transfer area of the heat exchanger can be reduced by using counterflow. If the heat transfer area remains the same, the consumption of heating or cooling fluids can be reduced when counterflow is used. The former can save equipment costs, and the latter can save operating costs, so countercurrent heat exchange should be used as much as possible in design or production and use.

When two or one of the cold and hot fluids has a phase change (boiling or condensation), because only the latent heat of vaporization is released or absorbed during the phase change, the temperature of the fluid itself does not change, so the inlet and outlet temperatures of the fluid are equal, and the temperature difference between the two fluids has nothing to do with the choice of the flow direction of the fluid. In addition to the two flow directions, forward and countercurrent, there are also flow directions such as cross-flow and influx.

Reducing the thermal resistance in the wall heat exchanger in order to increase the heat transfer coefficient is an important issue in the heat transfer process. The thermal resistance is mainly the thin layer of fluid (called boundary layer) that adheres to the heat transfer surface on both sides of the wall, and the dirt layer formed on both sides of the wall during the use of the heat exchanger, and the thermal resistance of the metal wall is relatively small.

Increasing the flow velocity and perturbation of the fluid can thin the boundary layer, reduce the thermal resistance and improve the heat supply coefficient. However, increasing the fluid flow rate will increase the energy consumption, so the design should be reasonably coordinated between reducing the thermal resistance and reducing the energy consumption. In order to reduce the thermal resistance of the dirt, try to delay the formation of the dirt and clean the heat transfer surface regularly.

Generally, heat exchangers are made of metal materials, among which carbon steel and low-alloy steel are mostly used to manufacture medium and low pressure heat exchangers; In addition to being mainly used for different corrosion-resistant conditions, austenitic stainless steel can also be used as a material that can withstand high and low temperatures; Copper, aluminum and their alloys are mostly used in the manufacture of low-temperature heat exchangers; Nickel alloys are used at high temperatures; In addition to making gasket parts, some non-metallic materials have begun to be used to make corrosion-resistant heat exchangers for non-metallic materials, such as graphite heat exchangers, fluoroplastic heat exchangers and glass heat exchangers.

2. Selection and calculation of plate heat exchanger

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The structural design and process design of heat exchanger are two different concepts, and their main differences are reflected in the content and focus of the design.

The structural design of the heat exchanger mainly refers to the consideration of the material, shape, size, structure and other factors in the product design stage to determine the shape of the heat exchanger product and the size and shape of the parts, the basic structure types and other basic structural types, and on this basis, the next step of production. Factors to be considered in the structural design include heat transfer efficiency, smoothness of slag discharge and drainage, installation and maintenance of equipment, etc., the main purpose is to ensure the normal operation of the heat exchanger.

The process design of heat exchanger refers to the design of processing technology and production process and the formulation of production plan according to the specific requirements of product structure design in the production process of the product, so as to ensure the quality of the product and the completion time. For example, in addition to determining the size and shape of the parts, it is also necessary to consider how to process the parts (such as how to cut the larger metal plates into small heat exchanger plates), as well as the processing technology and assembly methods of the individual parts.

Therefore, although these two designs are related to heat exchanger products, the design focus of the two is different, the structural design focuses on the basic structural requirements of the product, and the process design focuses on the design and implementation of the production process.

The formula for calculating the heat exchange area is f=q kk*tm

f is the effective heat exchange area of the heat exchanger; q is the total heat exchange; k is the dirt coefficient generally taken; k is the heat transfer coefficient ; tm is the logarithmic mean temperature difference.

Setting: specific heat of air d[j (kg*k)], density p (kg m 3), tube thickness h (m), thermal conductivity of copper [j (m*k)]. The heat dissipation area is s(m*2).

The average temperature difference δt=(82+33) 2-29=28 5(k) then the heat dissipation power is: a=δt*12000*p*d 3600(j s). Feast.

At the same time a= *s*δt h, from which s can be solved.