What should be paid attention to when describing a spiral plate heat exchanger?
1. Describe the policy
The description guidelines for spiral plate heat exchangers include the type of working fluid and its flow rate, inlet and outlet temperature, working pressure, and power of spiral plate heat exchangers. Spiral plate heat exchangers for aerospace applications should also include the allowable pressure drop, scale, and quality.
2. Overall placement
The overall placement of the spiral plate heat exchanger must first select the type and layout of the spiral plate heat exchanger, the fluid activity mode and the materials used, and then select the type of heat transfer surface. Consider the operating temperature and pressure, etc.
3. Heat drawing
Heat characterization of spiral plate heat exchanger includes heat transfer calculation, flow resistance calculation and determination scale. In addition to the technical function guidelines, heat transfer surface characteristics (including heat transfer characteristics, flow resistance characteristics, and layout parameters) and thermal physical parameters of fluids and materials are also required. Optimization skills can be applied to spiral plate heat exchanger heat depictions. According to the depiction guidelines, various selected spiral plate heat exchanger methods and heat transfer surfaces are optimized and analyzed through different viewpoints to provide several options.
4. Layout drawing
The tissue description of the heat exchanger includes the following:
(1) According to the high operating temperature and high operating pressure, as well as the heat drawing and resistance calculation results, determine the data and standards of each part to ensure the function of the heat exchanger during stable operation.
(2) Select welding methods and sealing materials based on operating temperature, pressure, and fluid properties.
(3) In order to ensure the uniformity of fluid distribution, the head, headers, nozzles and baffles are depicted.
(4) In order to satisfy the layout of thermal and resistance functions, the strength of the main components must be checked to prevent damage or overly thick selection under extreme operating conditions.
(5) Consider the need for repair (including cleaning, repair, and protection, etc.) and transportation.
For some spiral plate heat exchangers operating under special conditions, some also need to calculate the thermal stress during the start-up and parking period, calculate the layout oscillation caused by fluid activity, or check the flow rate in order to reduce corrosion and layout. After all, the layout description is as important as the thermal description, and the spiral plate heat exchanger needs to be depicted together and probably in harmony with each other.
5. Drawing plan selection
After the heat drawing and layout of the spiral plate heat exchanger are completed, a plan for the layout to choose from is provided, and then the plotter is based on the evaluation criteria. Consider various specific conditions for final selection.
The selection criteria are qualitative, such as mold making conditions, brazing furnace dimensions, shipping constraints, delivery dates, company policies, and competition intensity.
Evaluation criteria refer to policies that can be quantitatively measured, such as weight, external dimensions, pumping fluid consumption, initial investment, and lifespan.
After analyzing the above aspects, a description of the spiral plate heat exchanger can be submitted to the owner at the end, or several descriptions can be submitted for selection.