According to the data provided in the illustrated table, if the low side saturation temperature is maintained at 5°F and the high side saturation temperature is maintained at 86°F, what is the compression ratio of the system's compressor? See illustration GS-RA-23.
• Use the table to find the saturation pressure (psia) that corresponds to 5°F on the low side and 86°F on the high side • Compression ratio for a vapor‑compression system is typically discharge absolute pressure ÷ suction absolute pressure • Be careful about the difference between psia (absolute) and psig (gauge) when deciding whether you have enough data
• From the table, what is the pressure (in psia) at 5°F, and what is the pressure (in psia) at 86°F? • If you divide the higher saturation pressure by the lower saturation pressure, which of the answer choices is closest to that ratio? • Does the table already give you absolute pressures, or would you need additional information (like atmospheric pressure) to convert them?
• Confirm that the pressures in the table are labeled psia, not psig • Verify you are using the correct rows for 5°F and 86°F (interpolate only if necessary) • After computing the ratio, compare carefully with each option to see which value your result is closest to
No comments yet
Be the first to share your thoughts!