Question
Download Solution PDFIn order to have a low by-pass factor of cooling coil, the fin spacing and the number of tubes rows should be respectively
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
- Let 1 kg of air at temperature td1 is passed over the coil having its temperature td3 as shown in the figure.
- A little consideration will show that when air passes over a coil, some of it (say x kg) just by-passes, unaffected while the remaining (1 - x) kg comes in direct contact with the coil.
- This by-pass process of air is measured in terms of a by-pass factor.
- The BPF depends upon the following factors :
- The number of fins provided in a unit length i.e. the pitch of the cooling coil fins.
- The number of rows in a coil in the direction of flow.
- The velocity of flow of air.
- It may be noted that the by-pass factor of a cooling coil decreases with a decrease in fin spacing and an increase in the number of rows.
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