Designing Heating And Ventilating Systems the Practical Application of the Engi
Designing Heating And Ventilating Systems the Practical Application of the Engi
Charles Arthur Fuller
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22 . 30 1. 40 1. 49 1. 57 1. 64 1. 77 Referring to the table, for four sections deep and a velocity of 1200 ft. Per minute, K = 2. 12. 2270 227 R=- - -107 deg. 2. 12 2. 12 132 DESIGNING HEATING AND VENTILATING SYSTEMS Final temperature of air will be 107 deg. Assume that the air under the above conditions enters at 10 degrees below zero, instead of zero t then equals ( 10). 227 (10) 227+10 237 The total rise in temperature is 111. 8 deg. The air enters at 10 deg. Therefore the final temperature... is 101. 8 deg. The same formula may be used to determine the number of sections to use if a certain rise in temperature of the air is re- quired. The formula should then be solved for K and expressed as follows: Let it be required to obtain a temperature rise of 85 deg. Through the heater with air entering at zero degrees. Deter- mine the number of sections and the velocity of air to use, temperature of the entering air zero degrees, and steam tem- perature 227 deg. 2270 227 K = - -= = 2. 67 85 85 Referring to the table nearest constant to this is 2.
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