銅キャピラリーチューブ

形容

How Capillary Tube Works?

When the refrigerant leaves the condenser and enters the capillary tube its pressure drops down suddenly due to very small diameter of the capillary. In capillary the fall in pressure of the refrigerant takes place not due to the orifice but due to the small opening of the capillary.

The decrease in pressure of the refrigerant through the capillary depends on the diameter of the capillary and the length of the capillary. Smaller is the diameter and more is the length of the capillary more is the drop in pressure of the refrigerant as it passes through it.

In the normal working conditions of the refrigeration plant there is drop in pressure of the refrigerant across the capillary but when the plant stops the refrigerant pressure across the two sides of the capillary equalize. Due to this reason when the compressor restarts there won’t be much load on it. Also, due to this reason one cannot over-charge the refrigeration system with the refrigerant and no receiver is used.

The capillary tube is non-adjustable device that means one cannot control the flow of the refrigerant through it as one can do in the automatic throttling valve. Due to this the flow of the refrigerant through the capillary changes as the surrounding conditions changes. For instance as the condenser pressure increases due to high atmospheric pressure and the evaporator pressure reduces due to lesser refrigeration load the flow of the refrigerant through the capillary changes. Thus the capillary tube is designed for certain ambient conditions. However, if it is selected properly, it can work reasonably well over a wide range of conditions.

The length of the capillary of particular diameter required for the refrigeration applications cannot be found by fixed formula rather it is calculated by the empirical calculations. Some approximate length required for certain application is found out and it is then corrected by the experiments.

Important Points to Remember when Installing Refrigeration Plants with Capillary Tube

Since the pressure on the two sides of the capillary equalizes when the refrigeration plant is stopped, one should not overcharge the system with the refrigerant. Due to this reason the receiver is also not installed in the refrigeration system with the capillary. If the system is overcharged the discharge pressure from the compressor will be high and the compressor would get overloaded. Thus the refrigerant charge in the refrigeration and air conditioning systems with the capillary tube is critical.

The technician should be very careful while brazing the capillary to the condenser and the evaporator coil. Since the diameter of the capillary is very small the capillary may get blocked if the brazing is done deep inside. Brazing the capillary requires lots of expertise and patience.

In most of the cases, when the fresh refrigerant is charged into the refrigerator or the deep freezers, the capillary of the system should also be changed. This is because when the machine is stopped some oil particles may clog the capillary as the refrigerant leaks to the atmosphere.

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銅パイプの利点:
1. 軽量, 良好な熱伝導率と高い低温強度を備えています. 熱交換装置の製造に一般的に使用されます (コンデンサーなど). また、酸素製造装置の低温パイプラインの組み立てにも使用されます. 加圧された液体の搬送には、直径の小さい銅パイプが一般的に使用されます (潤滑システムなど, 油圧システム, 等。) 計器用圧力測定パイプとして.
2. 銅パイプは強くて耐食性があります, 現代の請負業者が水道管を設置するのに好ましい選択肢となっています, 暖房, すべての住宅商業ビルの冷却パイプ.
3. 銅管は1つのボディに多くの利点を兼ね備えています: それは強く、普通の金属の高い強度を持っています; 同時に, 曲がりやすい, 捻転, クラッキング, 通常の金属よりも壊れます, ある程度の凍上と耐衝撃性があります. そこで, インストール後, 建物の給水システムの銅水道管は安全で信頼性があります, メンテナンスや維持も必要ありません.
銅パイプの欠点: 銅パイプに関する限り, 彼らの高い価格は彼らの最大の欠点です, そしてそれらは現在最もハイエンドの水道管です. それらは通常溶接技術を使用して設置され、一生漏れることはありません. 銅管インターフェースでの接続は、主に建設技術のレベルに依存し、建設品質に対する高い要件があります.