The brazed Plate Heat Exchanger (BPHE) is a type of heat exchanger construction in which metal plates with flat surface offer an effective and efficient method of heat transfer. These plates are joined together by brazing (mainly copper), typically stainless steel. Due to the close contact between the two surfaces, there is a very high heat transfer coefficient, leading to a low overall unit size. They therefore provide much greater efficiency than a Shell And Tube Heat Exchanger.
Brazed Plate Heat Exchangers are widely used in air-conditioning and refrigeration, power generation, and other process applications. For example, within a cooling cycle, a BPHE can be used to transfer heat from one fluid to another. Typical fluids in such coils and systems are either glycol or water. In a power system, a BPHE can be used to cool oils, recirculating lubricants, fuels, and other fluids.
The major advantages of BPHE are their compact size, efficient heat transfer and minimal pressure loss. BPHEs also have low maintenance requirements and a long service lifetime. Furthermore, because of their flat surface design, BPHEs have no patterns or turns and thus lower energy costs and minimize fouling. Finally, the material used in BPHEs makes them resist to corrosion and heat, making them ideal for high temperature and hostile environments.
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1. The limit test gradually increases the environmental stress, finds the upper limit of the environmental stress of the equipment (including the components), and determines the safety factor that the equipment uses under the required environmental conditions.
2. After the prototype has been machined out of the development test, an environmental stress is applied to the prototype of the prototype, and its reliability index is checked. In the equipment plan phase, the same environmental stress is applied to various prototypes of different components, materials, structures, and processes, and the reliability index is compared to select the best solution so that high reliability and economic benefits can be obtained. . Another purpose of this kind of test is to measure its reliability index.
3. After the reliability growth test is completed, the failure mode has been defined, and targeted measures have been taken to improve one or more failure factors that have a large impact on the reliability index, so as to achieve the objective of increasing the average adjacent failure time.
4. After the identification test determines the sample according to a certain sampling mode, one or more environmental stress factors are applied to the sample, and a long-term test is performed to obtain a reliability index, thus confirming whether the developed equipment meets the requirements or not. . If the sample is a factory small batch prototype, it is a conclusion that the equipment manufacturing process equipment and management procedures meet the requirements.
5. After the screening test equipment was changed from development to mass production, due to defects in components, materials, workmanship and staff in production, new failure factors were brought to the equipment, or the original potential failure factors of the equipment were expanded, resulting in equipment failure. Early failure, so that the equipment reliability index decreases. In order to approach or achieve the reliability index of the equipment in the development and appraisal, a certain method that leaves no residual stress before the equipment is delivered or in the production process, and does not bring serious consequences to the equipment life, causes the failure of the equipment to be exposed. . The purpose of this type of test is to eliminate the exposed faults, so that the factory qualified equipment can have better reliability indicators.
6. The reliability acceptance test applies the environmental stress level in use to the equipment that can expose its failure to check the equipment reliability level due to the hidden dangers and minor changes in the process, components, materials, production and quality management processes. Reduced to the level of reliability appraisal.
7. The field environmental reliability test will bring the equipment directly to the field environment for use, assess the reliability of the equipment, and calculate its reliability data. If the conditions of the on-site environmental field tests are typical and representative, then the reliability data obtained in the field is the most important. Because the field test reflects the real situation of the use environment, it can be used to verify whether the data obtained from the indoor environment simulation test is true.
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As a environmental testing equipment manufacturer, Wuhan Shangchen Test Equipment Co., Ltd. is an experimental equipment developed and produced by the company (UV aging test chamber, high and low temperature test chamber, constant temperature and humidity test chamber, salt spray corrosion test chamber, etc.) Different reliability environmental tests. According to the different circumstances and the needs of the experimental situation, we have summarized the following seven reliability environmental tests.
August 28, 2023