12 Unit 8: Right Triangles & Trigonometry Homework 5: Trigonometry: Finding Sides and Angles Solve for x. Round to the nearest tenth. 2. 14. Find CDB. 27 18 4. 15 33 $ 27 8. 14 IA 12 10.
The correct answer and explanation is:
The correct answer is:
c. 20°F
Explanation:
To determine the evaporator superheat, we need to follow these steps:
- Find the Saturation Temperature Corresponding to the Suction Pressure:
- The given suction pressure is 15 psig.
- Using an R-404A pressure-temperature (PT) chart, the corresponding saturation temperature at 15 psig is 20°F.
- Measure the Actual Suction Line Temperature:
- The given suction line temperature (at the TEV bulb) is 40°F.
- Calculate the Superheat:
- Superheat = Actual Suction Line Temperature – Saturation Temperature
- Superheat = 40°F – 20°F
- Superheat = 20°F
Since the calculated superheat is 20°F, the correct answer is (c) 20°F.
Importance of Superheat in Refrigeration Systems:
Superheat ensures that only gas (no liquid refrigerant) enters the compressor, preventing liquid slugging which can cause severe damage. Proper superheat settings also optimize system efficiency and cooling performance.
- Low Superheat (Too Little Superheat)
- Can cause liquid refrigerant to enter the compressor (liquid slugging).
- Leads to compressor damage and reduced system lifespan.
- Indicates that the expansion valve (TEV) is feeding too much refrigerant.
- High Superheat (Too Much Superheat)
- Indicates that the evaporator is not receiving enough refrigerant.
- Can result in poor cooling efficiency.
- May cause higher energy consumption.
For an R-404A walk-in freezer, the ideal superheat range is typically 10-20°F. A 20°F superheat is on the higher end but still within an acceptable range for proper operation.
Image Representation:
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