EVAPORATIVE ROOF COOLING BY PATTERSON VENTILATION F.A.Q.
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1 EVAPORATIVE ROOF COOLING BY PATTERSON VENTILATION F.A.Q.
2
3 Q: WHAT DO BUYERS CONSIDER THE MAIN BENEFIT OF EVAPORATIVE ROOF DECK COOLING? ANSWER: THERE ARE SEVERAL. TODAY, MANAGERS ARE SEEKING WAYS TO REDUCE ELECTRICAL CONSUMPTION. TOMORROW THEY MAY DISCOVER EXTENDED LIFE OF ROOFS AND COMPRESSORS ARE ADDED BENEFITS.
4 Q: HOW EXTREME ARE ACTUAL DRY ROOF CONDITIONS? AT 102 F, ROOF TEMPS REACH 158 F WORKING TEMPS: 104 F UNDER-ROOF TEMPS: 120 F MEZZANINES: 106 F BTU PENETRATION: 15 PER SQ. FT
5 Q: HOW MEASURABLE IS THE SOLAR SHIELD EFFECT? ROOF TEMPS DROP TO 89 UNDER-ROOF TEMPS DROP TO 88 WORKING LEVEL: 84 MEZZANINES: 86 BTU INVASION DOWN TO 3 PER SQ. FT
6 BEFORE AND AFTER SOLAR SHIELD INSTALLATION BEFORE: ROOF DECK: 158 UNDER-ROOF: 120 WORKING TEMP: 104 MEZZANINE TEMP: 106 WITH SYSTEM IN PLACE ROOF DECK 89 UNDER-ROOF 88 WORKING TEMP 84 MEZZANINE TEMP 86
7 Q: HOW WILL ROOF COOLING HELP CONTROL THE COSTS OF AN AIR CONDITIONED FACILITY? A: Here is an example to illustrate what would happen.
8 THIS BUILDING IS ASSUMED TO BE: An air conditioned 100,000 sq ft building with insulation needing 4.0 tons/1,000 sq ft to cool it.
9 HERE S WHAT THE POWER FOR AIR CONDITIONING COSTS TO COOL THIS BUILDING: IF IT NEEDS 400 TONS OF REFRIGERATION, IT WILL FAIRLY CONSERVATIVELY COST $10/TON TO RUN IT... WHICH IS EQUAL TO $4,000/DAY. IF THERE ARE 200 COOLING DAYS PER SEASON, THEN A/C COSTS ARE $800,000 PER COOLING SEASON.
10 WHEN A SOLAR SHIELD SYSTEM IS ADDED... AS A WET ROOF, 87% OF THE SOLAR HEAT LOAD CAN BE INTERCEPTED BY ADDING THE COST OF THE SYSTEM S WATER. ADDITIONALLY, SOLAR SHIELD HELPS REMOVE HEAT VIA RADIANT CONDUCTION AT NIGHT.
11 COMPARING THE DAILY COSTS OF THE TWO SYSTEMS... $124/DAY FOR WATER VS. $4,000/DAY FOR ELECTRICAL POWER TO AIR CONDITION
12 THE SEASON-LONG WATER COST TO OPERATE THE PATTERSON ROOF COOLING SYSTEM $124 PER DAY X 200 DAY LONG SEASON = $24,800 ANNUALLY
13 ANNUALIZED, ELECTRICAL POWER COST FOR AIR CONDITIONING 200 DAYS PER SEASON AT $4,000 PER DAY = $800,000 ANNUALLY
14 Q: ARE ALL $800,000 SAVED? NO. HOWEVER SAVINGS BEGIN DAY ONE An air conditioned building will have nearly all of the solar load intercepted. Both kwh and demand charges will drop. A/C compressors will cycle much less often.
15 Q: WHAT KINDS OF CLIMATES ARE CONSIDERED WORKABLE? THE COMBINATION OF HOT CLIMATE AND DRY AIR IS OPTIMAL HOWEVER ANY LOCATION WILL WORK WHERE NORMAL SOLAR RADIATION GETS ROOFS HOT
16 Q: WILL HIGHLY HUMID CLIMATES REDUCE THE EFFECT? ANSWER: [EMPHATICALLY] NO! AS ROOF DECK TEMPERATURES APPROACH 170 F. RELATIVE HUMIDITY IS MEANINGLESS. WATER EVAPORATES AND COOLING ENSUES!
17 Q: ARE THERE PRACTICAL LIMITS TO BUILDING TYPES AND SHAPES? Answer: YES, WE ARE PRETTY GUNG-HO. BUT, SADLY, THERE ARE LIMITS TO WHERE THESE SYSTEMS CAN BE PUT TO WORK SO EVERY ONCE IN A LONG WHILE
18 WE HAVE TO REMEMBER TO JUST SAY,
19 NEXT RULE OF THUMB IF A PERSON CAN WALK ON YOUR ROOF... WE CAN INSTALL A SOLAR SHIELD EVAPORATIVE ROOF COOLING SYSTEM SUCCESSFULLY ON YOUR ROOF!
20 Q: ARE THERE POTENTIAL DRAWBACKS? WILL MY ROOF WARRANTY BE JEOPARDIZED? NO. IN FACT, ROOF MANUFACTURERS APPLAUD THE SYSTEM, THE SOLAR SHIELD SYSTEM WILL NOT AFFECT THE STANDARD FIRESTONE ROOFING SYSTEM WARRANTY. JAMES L. HOFF, MANAGER, TECHNICAL SUPPORT SERVICES
21 Q: WILL MY ROOF LEAK WITH EXTRA WATER UP THERE? Answer: WHAT WAS YOUR ROOF DESIGNED TO DO? REPEL WATER WE WILL NOT MAKE NEW LEAKS, BUT WE MAY HELP YOU FIND YOUR LEAKS
22 Q: HOW MUCH WATER? Answer: 11.5 OUNCES OF WATER (LESS THAN A CAN OF POP) SPREAD OVER EVERY 100 SQUARE FEET, EVERY SIX MINUTES
23 11.5oz./100 sq. ft./10 minutes
24 Q: AVERAGE WATER CONSUMPTION? A SOLID WORKING AVERAGE FOR DAILY CONSUMPTION IS 100 GALLONS PER 1,000 SQUARE FEET PER 10 HOUR DAY IN EXTREME CONDITIONS THIS RATE MAY REACH 200 GALLONS OVER THE SAME AREA AND TIME IN SHOULDER SEASONS, THE RATE WILL DROP TO 50 GALLONS
25 Q: WHAT MIGHT THE TYPICAL RESULTS LOOK LIKE? THERE ARE NO PERFECTLY TYPICAL BUILDINGS, BUT ON AVERAGE, COOLER ROOF DECKS YIELD IMPROVED WORKING CONDITIONS, MINIMAL OUTSIDE INVASION OF PARTICULATE MATTER AS WELL AS EXTENDED LIFE OF ROOFS AND REFRIGERATION EQUIPMENT
26 Q: TYPICAL TEMPERATURE REDUCTIONS? UNDER-ROOF TEMPERATURES ARE LOWERED BY 7 TO 10 DEGREES DURING HOT MONTHS AVERAGE IMPROVEMENTS REACH 12 TO 18 DEGREES ROOF DECK TEMPERATURES WILL STAY WAY DOWN DECK WILL NOT EXCEED 10 DEGREES ABOVE OUTSIDE WET BULB TEMP
27
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