AK_Port_Heiden | Performance | Economics | Sun Chart |

  Panel Surface Area  SF (No of 4x8 Panels * 32 SF/Panel)                    
  Collector Efficiency (percent absorbed)   (Derate for % of insolation reflected, re-radiated, % of active collector surface area shaded by framing, etc.)    
  Average Panel temperature (when insolated)  DegF (Differential controller runs fan when panel temp exceeds room (or storage) temp + differential)    
  Panel Glazing Conductivity (1/R) Btu/SF/DegF  Btu/SF (default = 0.61 for 6 mm twinwall polycarbonate from Mfr specs)    
  Fuel heat value (Btu/gallon)  Btu/Gal # 2 fuel oil      
  Heater efficiency (AFUE)          
  Fuel Cost  $/Gal per BBHA      
  Electric Cost  $/KWH per BBHA      
  Fan Power Watts (Assume 5 watts per 4x8 SF panel.)    
  Overall Building U, Btu/Hr/DegF  Btu/Hr/F (From building heat loss calcs. Varies btwn 200 & 250. See AkWarm Runs)    
           
       JAN   FEB   MAR   APR   MAY   JUN   JUL   AUG   SEP   OCT   NOV   DEC   YEAR   
  Average Daily Insolation on South Vertical Face Btu/SF (From Data)  
  No of Days   31 28 31 30 31 30 31 31 30 31 30 31  
  Gain, Btu (Panel Area * Efficiency * Daily Insolation * Days)  
           
  Daylight Hours (Max possible hours insolation -- From Sun Chart)    
  Average % Clear Sky During Daylight Hours (1-Sky Cover/10)    
  Avg Hrs/Day During Which Panel is Active (Gains and Loses Heat).    
  Average Ambient Temp during active hrs (AvgDay+AvgMax)/2    
  Loss, Btu (Panel Area * ΔT * U * Days * Hrs/Day)    
           
  Net, Btu  (Total gain - Total loss)    
           
  Value Of Solar Gain Captured (If *All* either used or stored)  
  Total Building Heat Loss (WITHOUT Solar Gain) MBtu  
  Percent Of Total Building Heat Loss Provided By Solar Panels    
  Total Gallons Heating Fuel used (WITHOUT solar panels)  
  Total Gallons Heating Fuel used (WITH solar panels)  
  Gallons of Fuel Saved    
  Cost/Month to operate Fan (Watts * $/KWH * Days * Hrs/day)    
         
  INPUT: TMY3 DATA FOR PORT HEIDEN AK  MONTHLY WEATHER DATA SUMMARY -- DOE-2.1E-117 -- LATITUDE =  56.95 -- LONGITUDE =  158.62 -- TIME ZONE =   9  
       JAN   FEB   MAR   APR   MAY   JUN   JUL   AUG   SEP   OCT   NOV   DEC   YEAR   
  AVG. DAILY MAX. TEMP.           37.5 32.9 34.6 39.5 41.3 52.6 56.5 54.7 53.1 41.0 39.3 32.5 43.0  
  HEATING DEG. DAYS (BASE 65)     1,005 1,061 1,093 968 911 587 458 461 508 920 926 1,189 10,084  
  AVG. TEMP. (DAY)                34.3 29.5 30.9 36.4 38.1 48.7 53.0 51.8 50.5 38.3 37.0 29.0 42.4  
  AVG. SKY COVER (DAY)            5.7 4.6 6.4 5.8 7.8 7.8 8.5 8.9 7.8 8.0 6.9 6.6 7.4  
  AVG. DAILY TOTAL VERTICAL SOLAR, AZIMUTH S 453 681 829 1,159 1,125 967 858 784 785 489 373 273 731