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Extra resources for HVAC System Test-Adjust-Balance
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4 When the flow is turbulent," the friction rate in− creases, heat transfer through the walls of an exchang− er increases, and usually, so does the system noise that is created by the fluid flow. Q + AV Equation 2-13 Where: Q = Fluid flow A = Area Air Water cfm (L/s) gpm (L/s) ft2 (m2) ft2 (m2) V = Velocity fpm (m/s) fpm (m/s) *Correction constants are needed so that the units in the equation are compatible. 2 Friction It has been indicated that the flow of the fluid is re− sisted by a well known paradox of nature called fric− tion.
The addition or subtraction of la− tent and sensible heat appears as a combination pro− cess with all changes occurring simultaneously. The result is neither a horizontal nor vertical line but a slanted one tilted in the direction dictated by process. Referring to Figure 2−12, consider the general rules be− low based on the two endpoints of the process; the first being the initial condition of the air; and the second be− ing the final condition after the process or a portion of the air treatment has been completed.
This is usually closest to the lowest dry bulb point since outside air quantities are usually less than 50 percent. ) The point “C” represents what mixture conditions should be if the air quantity proportions are correct. 7_C WB are two of them). One common error made by many novices, is the improper location of the mixed air point on the charts. Some reverse the ratio of the mixing streams, causing the mixed point shown in Figure 2-15 to occur near the top right hand point “B”. When two airstreams are mixed and are plotted in graph form, the following steps should be remembered: Assume that the air streams are being mixed a 50 percent ratio which causes the mixed point to be directly between points “A” and “B”.