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This video shows a homemade refrigeration system, including a self-made evaporator:
Key Components & Construction Details
- Shell: A large diameter pipe acting as the pressure vessel, containing the refrigerant.
- Tube Bundle: A network of tubes—usually copper—installed within the shell to maximize heat transfer surface area.
- Tube Sheets: Flat plates designed to securely hold the tube bundle in place on both ends.
- Baffles: Internal supports that direct the fluid flow, increasing efficiency and providing structural support for the tubes.
- Sealing: All connections must be carefully brazed, as the evaporator holds pressurized refrigerant (e.g., propane, R22).
Steps for Assembly (General DIY Guide)
- Design & Sizing: Determine the heat load to decide on the length and number of tubes, along with the required shell diameter.
- Tube Preparation: Straighten the copper tubing and prepare the tube sheets by drilling holes for the tubes.
- Assembly: Insert the tube bundle into the shell.
- Brazing/Welding: Weld the tube sheets to the shell and braze the tube ends to the sheets to ensure a high-pressure seal.
- Refrigerant Connections: Install inlet and outlet ports for the refrigerant and water lines.
- Pressure Test: Test the completed assembly for leaks, typically using a compressor to create a vacuum.
Common Applications
- Small-Scale Chillers: Used in custom refrigeration setups for cooling liquid circuits.
- Maple Syrup Production: A specialized form involving fireboxes and pans to boil down sap, constructed from repurposed oil tanks.
Key Design Considerations
- Thermal Efficiency: The surface area of the tubes determines the effectiveness of the heat transfer.
- Flooded vs. Dry Expansion: In a flooded system, the tubes are submerged in liquid refrigerant. In a dry expansion system, the refrigerant passes through the tubes.
- Durability: The unit must handle high pressures and temperature differentials, often requiring thick-walled construction.
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People also ask
What is the 10 13 rule for shell and tube?
In simple terms, it ensures that the design pressure of the side with lower pressure (whether it's the shell or the tube side) is set to at least 10/13 of the design pressure of the side with higher pressure.Mar 4, 2024
Understanding the 10/13 Rule for Shell and Tube Heat Exchangers
LinkedIn
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LinkedIn
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What are the 4 types of evaporators?
These evaporators are available in four configurations: rising/falling-film, falling-film, forced-circulation with suppressed boiling, and agitated thin-film.
Types of Evaporators - Vobis, LLC
Vobis, LLC
https://www.vobisllc.com › types-of-evaporators
Vobis, LLC
https://www.vobisllc.com › types-of-evaporators
Which is better clamshell or tubular heat exchanger?
Both clamshell and tubular heat exchangers have unique advantages. Tubular models are often the better choice for new installations thanks to their durability and energy efficiency. Clamshell designs, on the other hand, may be the right fit when space is limited or when replacing a similar existing unit.
Clamshell vs Tubular Heaters: What's the Difference? - ChopAir
ChopAir
https://chopair.com › heating › clamshell-vs-tubular-heat...
ChopAir
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What is the cost of a shell & tube exchanger?
Our price: $369.00
Constructed of 316L stainless steel, this shell & tube heat exchanger is a very reliable and effective way to transfer heat indirectly between the outdoor furnace and pool or spa circuit. Unit is designed for either horizontal or vertical mounting (mounting brackets are included).
Constructed of 316L stainless steel, this shell & tube heat exchanger is a very reliable and effective way to transfer heat indirectly between the outdoor furnace and pool or spa circuit. Unit is designed for either horizontal or vertical mounting (mounting brackets are included).
Shell & Tube Exchanger, 316L, 155k Btu - DIWH Heating
DIWH Heating
https://www.diwhheating.com › product-p
DIWH Heating
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Shell And Tube Heat Exchanger
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PDF
by SS Ghaffari2015 — In this study, the design of the structure of the evaporator, Solid Works was done by software. And the relationship between formulas and ...Read more
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