Balancing of a Water and Air System (PDF

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112 can be used. If these become too expensive or unwieldy, measure the flow by Pitot tube traverse. Taps for Pitot tube traverses can be installed in either vertical or horizontal pipe runs. As illustrated in Figure 13.7, the taps must be perpendicular to the pipe and at 90" from one another. Adequate clearance [roughly the pipe diameter, plus three feet (1 m)] must be available at each tap to install and position the Pitot tube. If make-up enters or blow down leaves the tower or the system at a point where it will affect any of the measured test values, they must either be shut off for the duration of the test or the flow rates measured. Usually, these measurements lend themselves to a volumetric or bulk measurement procedure. In many instances, a water meter will have been installed in the make-up line and can be used for this purpose. In virtually all instances, the blow down can be valved off during the test period. Fan Motor Power Most cooling tower fans are driven by electric motors of 480V or less. The preferred method for measuring power is to use a calibrated, clamp-on wattmeter to measure the KW input to the motor(s) and convert this to Horse power output using the motor manufacturer's efficiency values. Brake horsepower can be calculated. Wind Velocity When a cooling tower test is run under conditions of little or no wind, the parties to the test often may agree to forego measurement of wind velocity. Strict compliance with the test code, however, requires that wind velocity be measured with a meteorological anemometer and wind vane. For towers with an overall height of less than 20 feet (6 m), the point of measurement is 5 feet (1.5 m) above the basin curb at a distance 50 to 100 feet (15-30 m) upwind of the tower. 112
113 GPM = FPM X Gallons per foot FPM = 1040 X √ VP 113
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Balancing of a water and air system
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3 8 TBA (Testing, Balancing and Adj
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5 Air Balancing Multiple Hood syste
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7 87 Series Loop 88 One pipe main 9
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9 Testing and Balancing HVAC A syst
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11 13. Filter frame properly instal
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13 13. Measure and record all requi
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15 15 Example 3: Find the nearest s
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17 For traverses taken in round duc
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19 Flat Oval Duct Traverses For fie
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21 Balancing Devices Volume Dampers
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23 Turning Vanes Turning vanes (Fig
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25 Balancing the VAV System The gen
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27 maximum out-side air damper for
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29 determines how much energy is in
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31 the water removing capacity of a
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33 Table 8A Dry Bulb on left, Wet B
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35 60 58 56 54 52 50 48 46 44 42 40
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37 Foot³ per 1lb Altitude 0 Feet A
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39 Table 9 C Air Density at 29.29
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41 41 Wet-Bulb (F) .0 .1 .2 .3 .4 .
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43 Table 11A Enthalpy at saturation
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45 Table 11 C Enthalpy at saturatio
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47 Wet bulb temperature____________
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49 and replacement should be shut o
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51 duct may be great; the balancing
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53 Design below the 250°F limit (A
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55 Differential Pressure Gauges The
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57 Venturi The venturi is a device
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59 Pressure Total pressure Velocity
Page 61 and 62: 61 Table 1 shows that if the coil i
Page 63 and 64: 63 adjustment of these devices is n
Page 65 and 66: 65 Grouting Motor and lubrication N
Page 67 and 68: 67 For every outside temperature ot
Page 69 and 70: 69 4. Identify the riser with the h
Page 71 and 72: 71 2. Turn the pump off 3. Close th
Page 73 and 74: 73 Net positive suction head availa
Page 75 and 76: 75 All automatic control valves mus
Page 77 and 78: 77 77
Page 79 and 80: 79 4. Read and record the actual pu
Page 81 and 82: 81 13. Record the coils design and
Page 83 and 84: 83 Air Control Air is always presen
Page 85 and 86: 85 • allow draining of all or par
Page 87 and 88: 87 Valves have linear throttling ch
Page 89 and 90: 89 to all the terminals down the li
Page 91 and 92: 91 Pump Circuits Primary-Secondary
Page 93 and 94: 93 • Evaporator: • the design a
Page 95 and 96: 95 95
Page 97 and 98: 97 Condenser • the design and act
Page 99 and 100: 99 • Each reading of liquid tempe
Page 101 and 102: 101 • Design and actual entering
Page 103 and 104: 103 differs from the average by mor
Page 105 and 106: 105 • Orifice plate • Turbine m
Page 107 and 108: 107 BTUH = GPM X 60 X 8.337 X ∆T
Page 109 and 110: 109 Lam = lbs. of air per minute th
Page 111: 111 When dry bulb temperature measu
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