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Capillary Tube Refrigeration: Working, Function 7 Size | Linquip

The capillary tube is one of the most commonly used throttling devices in refrigeration and air conditioning systems. The capillary tube is a copper tube with a very small internal diameter. It is of very long length and it is coiled to several turns so that it would occupy less space.


The capillary tube is an extremely simple device, and its use permits considerable simplification and cost reduction of the small hermetic refrigerating system. Using a capillary will: 1. Allow the use of a low cost, hermetic-type compressor and condensing unit, which has been specifically designed for capillary tube application. 2.

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Capillary Tube Refrigeration. Capillary Tube in Refrigeration ...

One of the most commonly used throttling devices for the refrigeration and air conditioning systems is the capillary tube. The capillary tube is made up of copper and it has very small diameter ranging from 0.5 to 2.28 mm (0.020 to 0.09 inches). Capillary tube used as the throttling device in the domestic refrigerators, deep freezers, water coolers and air conditioners. When the refrigerant passes through the capillary tube there is drop in its pressure.

Capillary Tube Refrigeration - Working Principle ...

Capillary Tube Refrigeration – Working Principle, Construction & Applications. Capillary tube is used as an expansion valve in small capacity hermetically sealed refrigeration units such as domestic refrigerators, water coolers, room air conditioners and freezers. Capillary tube is a tube of small internal diameter and of varying length, which depends upon the application.

The Effect of Capillary Tube Length on the Refrigeration System

How the capillary tube length effects the performance of the refrigeration system. Capillaries generally refer to slender copper tubes with an internal diameter of 0.4 ~ 2.0 mm. As the throttling mechanism of the water chiller system, the capillary tube is the simplest. It is widely used in small cooling system because of its low price and flexible selection.

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How to design a capillary tube: the simplest and most ...

Capillary tube use may extend to larger singlecompressor/single-evaporator systems, such as unitary air conditioners up to 35 kW capacity. The capillary tube is a piece of drawn copper tube with a small inner diameter. When used for controlling refrigerant flow, it connects the outlet of the condenser to the inlet of the evaporator. The term “capillary tube” is actually a misnomer because the inner bore, though narrow, is much too large to allow capillary action.


The capillary or restrictor tube needs no formal introduction to refrigeration service or design engineers. In fact everyone in the refrigeration industry has either heard of, or has had some experience with the cap tube, as we shall call it from no on. Of all the controls used in the refrigeration industry, if we pick

All You Need To Know About HVAC Capillary Tubes, Part 1 ...

Because the capillary tube restricts and meters the flow of liquid to the evaporator, it helps maintain the needed pressure difference for proper system operation. The capillary tube and compressor are the two components that separate the high side from the low side of the refrigeration system.