Discussion
Air enters a dryer at 60 degrees and leaves at 45 degrees still well short of saturation.
What does this suggest?
Answer: B
Correct answer: Only part of the drying potential is used
Exhaust air that is still hot and still well short of saturation has capacity to take up moisture that was never used. The air passed through too quickly, or contacted too little product, so both its sensible heat and its remaining drying potential leave with it.
This is the main efficiency loss in hot air drying, and it points to recirculating part of the exhaust, increasing the residence time or deepening the bed. It does not indicate an undersized heater - the air reached 60 degrees as intended - and the product cannot be at equilibrium with air this far from saturation.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development