If the evaporator coil horizontal return...

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Question 1 of 205eccef9dbacbc34ba4d45fd5

If the evaporator coil horizontal return line of a container refrigeration system is less than 0.875" (2.21 cm) in diameter (considered small), the thermostatic expansion valve sensing bulb should be attached where on the return line?

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🔍 Key Concepts

• Thermostatic expansion valve (TXV) sensing bulb purpose – what it is measuring and why • Refrigerant flow in a horizontal suction (return) line – where liquid vs. vapor tends to be in the pipe • Effect of small-diameter tubing (< 0.875 in) on how evenly refrigerant fills the line

💭 Think About

• Think about whether you want the sensing bulb to see mostly liquid, mostly vapor, or a good average of the mixture returning from the evaporator. • On a horizontal line, where does any remaining liquid refrigerant tend to collect inside the pipe – top, sides, or bottom? How would that affect the bulb reading? • How would mounting the bulb on the very top vs. very bottom vs. side of a small line change the temperature it senses and the valve’s response?

✅ Before You Answer

• Verify what condition the TXV is trying to control (superheat at the evaporator outlet). • Check what happens to superheat control if the bulb is placed where it might sense mostly liquid refrigerant instead of vapor. • Confirm how small diameter tubing affects refrigerant distribution so that the bulb sees a representative suction-line temperature.

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