Basic requirements for structural design of low temperature heat exchanger

Carbon steel and low-alloy steel heat exchangers (design temperature lower than -20℃), austenitic stainless steel heat exchangers (design temperature lower than -196℃) are low temperature heat exchangers, and the structural design should follow the following in principle.

Material selection of low temperature heat exchanger:
1. Use temperature of plastic materials
Polyvinyl chloride (PVC) -15℃~+80℃, polypropylene (PP) -30℃~+140℃, polyurethane (PU) -70℃~+80℃, polyethylene (PE)-100℃~+100 ℃. Plastics tend to be brittle in low temperature environments.

2. Operating temperature of carbon steel and low alloy steel
Q345R steel plate can be used at -60℃~-40℃ under low temperature and low stress conditions, and 16MnDR steel plate for low temperature can be used at -80℃~-70℃ under low temperature and low stress conditions. Q235B steel plate cannot be used in low temperature heat exchangers.

3. Operating temperature of high alloy steel (stainless steel)
1. The lower limit of the operating temperature of ferritic stainless steel is 0℃. 2. The lower limit of the operating temperature of austenitic-ferritic stainless steel is -20℃. 3. The lower limit of the operating temperature of austenitic stainless steel is -253℃

Structural design should fully consider the factors:
1. The structure should be as simple as possible to reduce constraints.
2. Avoid excessive temperature gradient.
3. Sudden changes in the shape of the structure should be avoided as much as possible to reduce local stress.
4. The connecting part of the connecting pipe and the shell should be smooth, and the inner wall of the connecting pipe end should be rounded.
5. The support or leg of the container shall not be welded to the shell, and a backing plate shall be provided

此博客中的热门博文

Constant Temperature Swimming Pool Heat Pump Unit | Hstarschiller.com

We all know that winter swimming has many advantages: 1. It can enhance cardiovascular function. 2. The stimulation of cold water can close the peripheral blood vessels, increase the blood supply of important organs such as heart, brain, liver and spleen, so that more oxygen can be delivered to brain cells in time, which is conducive to the elimination of nervous system fatigue. 3. The skin of those who insist on winter swimming is ruddy, shiny and elastic. And people also hope to enjoy the fun of swimming in winter, but not everyone can bear it. Hstars group constant temperature swimming pool heat pump can be a good solution. 1. Demand analysis of swimming pool with constant temperature Constant temperature swimming pool, also known as indoor constant temperature swimming pool; that is, the temperature of the water in the pool heating system is maintained at 26~28℃, which is suitable for the temperature of the human body. When the indoor swimming pool is designed, the water body o

阅读全文

The Role and Characteristics of Condenser in Refrigeration System

The four major components of the refrigeration system are compressor, evaporator, condenser and throttling device. The role of the condenser in the refrigeration system is mainly to cool and liquefy the gaseous refrigerant in the high temperature and high pressure state discharged from the compressor, so as to meet the requirements of the circulating use of the refrigerant in the system. The selection of the temperature difference between the condensing temperature and the coolant inlet and outlet involves economic issues in the refrigeration system. Increasing the condensation temperature and reducing the temperature difference between the coolant inlet and outlet can increase the heat transfer temperature difference, reduce the required heat transfer area, and reduce the investment cost of heat exchange equipment. However, lowering the condensing temperature can reduce the power consumption of the refrigeration compressor. The greater the temperature difference between the coolant

阅读全文

How to build a cost-saving cold room for Peanut Storage

Peanut storage conditions have significant effects on overall quality. With H.Stars standards for roof pitch, ventilation and other building standards, farmer stock peanut warehouses or cold room are the best solution. Here are some suggestions on one of the type peanut cold storage. Description of Peanut Cold Storage 1. Project details: The specific parameters of the Peanut Cold Storage are as follows: a. Cold storage size: 30m (length) × 25m (width) × 4.5m (height) b. Cold storage temperature: 10 ℃ c. Cold storage goods: peanuts without shell d: Storage capacity of cold storage: 1000Ton 2. After calculation, the chiller capacity of the cold storage is: 150kw 3. Refrigeration system description (1). This project adopts: efficient refrigeration chilled water system . a. The main refrigeration equipment of the high-efficiency chilled liquid refrigeration system is the water cooled chiller unit. After commissioning and testing in the factory, the whole chilled can be shipped to cu

阅读全文

H.Stars (Guangzhou) Refrigerating Equipment Group Ltd.

搜索此博客