1.)

Show all work, a small diagram of the structure labeled with the dimensions, and label all answers with the correct units.l. Design a fan and pad cooling system for a new double polyethylene film covered greenhouse that is 144feetlong and 150 feet wide. The range is made up of 6 continuous gutter connected bays, each 25 feet wide. The side walls and eaves are 12 feet high.The gutter to ridge-top vertical height is 5 feet and the gutter to gutter curved arch distance is 30feet(you do not have to calculate it).Use the orientation to provide the most uniform light for Grand Rapids, MI and consider the correct location of the headhouse and winds from the west when laying out the plan and placing fans and pads. (Show orientation on your diagram.)Assume an elevation of 800feet above sea level, a maximum interior light intensity of 6000 footcandles, and a pad to fan temperature variation of 7F. Include all formulas, F values, m and calculations. Show the number of fans, the size of the fans(width and HP), and the placement in a diagram. Calculate the pad size for 4-inch cellulose pads (assume the pads run the entirel ength of the greenhouse wall), the water reservoir(s)volume (in gallons) and the pump(s) size (gallon per minute) for the recirculated water.See tables inD2L ortext. Use L W 8

2.)

a.If the dry bulb temperature outside is 95F and the relative humidity is 50%, what is the wet bulb temperature assuming 100% efficiency of saturation by the cooling pads (ie.that the air gets to 100% relative humidity after passing through the pads?(Question is the same as "what is the wet bulb temperature?")

b. If your fan and pad system is only 80% efficient (ie. only 80% of the possible cooling that could occur if the system was 100% is attained), what is the lowest dry bulb temperature that can be achieved in the greenhouse (just inside the pads) under these conditions?

3.)

How would you ventilate the greenhouse range in number l during the winter months? What volume of air movement (exhaust) should be planned (show a calculation) and how could this best be accomplished? (Consider winter vs summer and how to use some of the same equipment for both if possible.) (There is more than one way to ventilate this range.) What additional F factor must be used (Hint: use the standard condition)?

Table 4-1 FACTORS USED TO CORRECT THE RATE OF AIR REMOVAL FOR ELEVATION ABOVE SEA LEVEL Elevation above Sea Level in ft (m) Under 1,000 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 (300) (300) (600) (900) (1,200) (1,500) (1,800) (2,100) (2,400) Felev 1.00 1.04 1.08 1.12 1.16 1.20 1.25 1.30 1.36 From National Greenhouse Manufacturers Association (2010). Table 4-2 FACTORS USED TO CORRECT THE RATE OF AIR REMOVAL FOR MAXIMUM LIGHT INTENSITY IN THE GREENHOUSE Light Intensity in fc (klux) 4,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500 8,000 (43.1) (48.4) (53.8) (59.2) (64.6) (70.0) (75.3) (80.1) (86.1) Flight 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60 From National Greenhouse Manufacturers Association (2010).Table 4-3 FACTORS USED TO CORRECT THE RATE OF AIR REMOVAL FOR GIVEN PAD-TO-FAN TEMPERATURE RISES Temperature Rise in F (C) 10 9 8 7 6 5 4 (5.6) (5.0) (4.4) (3.9) (3.3) (2.8) (2.2) Ftemp 0.70 0.78 0.88 1.00 1.17 1.40 1.75 1From National Greenhouse Manufacturers Association (2010).Table 4-4 FACTORS USED TO CORRECT THE RATE OF AIR REMOVAL FOR GIVEN PAD-TO-FAN DISTANCES Pad-to-Fan Distance in ft (m) 20 25 30 35 40 45 50 55 ) 6.1) (7.6) (9.1) (10.7) (12.2) (13.7) (15.2) (16.8) Fvel 2.24 2.00 1.83 1.69 1.58 1.49 1.41 1.35 Pad-to-Fan Distance in ft (m) 60 65 70 75 80 85 90 95 100 (18.3) (19.8) (21.3) (22.9) (24.4) (25.9) (27.4) (29.0) (30.5) and over Fvel 1.29 1.24 1.20 .15 1.12 1.08 1.05 1.02 1.00 1From National Greenhouse Manufacturers Association (2010). Table 4-5 AIR-DELIVERY RATINGS AND REQUIRED PAD AREAS FOR VARIOUS SIZES OF STEEL FANS Pad Area per Fan (ft2) Fan Size Horsepower cfm at 0.1 Inch Cellulose Cellulose (inch) (hp) Static Pressure Excelsior (4-inch) (6-inch) 24 0.25 4,530 30 BL 11 0.33 5,655 38 23 14 0.50 6,450 43 26 16 0.75 7,625 51 30 19 30 0.33 7,400 49 30 19 0.50 8,840 59 35 22 0.75 10,230 68 41 26 36 0.33 8,790 59 35 22 0.50 10,555 71 43 26 0.75 12,650 85 51 32 1.00 14,160 95 57 35 42 0.50 12,490 84 50 31 0.75 15,000 100 60 38 1.00 16,760 112 68 42 48 0.50 14,650 98 59 37 0.75 17,795 119 72 45 1.00 19,600 131 78 49 54 1.00 22,660 153 92 57 1.50 26,295 172 104 66 The data in the first three columns are from Acme Engineering and Manufacturing Corp., Muskogee, OK