Hybrid Car – More Fun with Less Gas

Re: Light output of dimmed lamps

register ::  Login Password  :: Lost Password?
Posted by nicksanspam on December 24, 2005, 9:15 pm
 


There would always be some visible light, but it's very faint at low temps :-)

20 PI=4*ATN(1)
30 LAMBDAU=7.8E-07'upper visible limit (meters)
40 LAMBDAL=3.8E-07'lower visible limit (meters)
50 FOR LT=2 TO 4'log F temp
60 TF^LT'temp (F)
70 TK=(TF+460)/1.8'temp (K)
80 GAM=.0143879/(LAMBDAU*TK)'Pivovonsky and Nagel (1961) polynomial term
90 CFRACU=0'initialize upper cumulative fraction
100 FOR M=1 TO 3
110 TERM/(PI^4)*(((M*GAM+3)*M*GAM+6)*M*GAM+6)
120 CFRACURACU+EXP(-M*GAM)/(M^4)*TERM
130 NEXT M
140 GAM=.0143879/(LAMBDAL*TK)
150 CFRACL=0
160 FOR M=1 TO 3
170 TERM/(PI^4)*(((M*GAM+3)*M*GAM+6)*M*GAM+6)
180 CFRACLRACL+EXP(-M*GAM)/(M^4)*TERM
190 NEXT M
200 P=5.6697E-08*(TK^4)'total emissive power (W/m^2)
210 EFRACRACU-CFRACL'fraction of emissive power in visible spectrum
220 PRINT TF,EFRAC,P,EFRAC*P
230 NEXT

temp          visible fraction    total power      visible power

100   F       6.010933E-22        531.1561 W/m^2   3.192744E-19 W/m^2
1000          2.753038E-07        24540.4          6.756065E-03
10000         .4668266            6.465423E+07     3.018231E+07

Nick


This Thread
Bookmark this thread:
 
 
 
 
 
 
  •  
  • Subject
  • Author
  • Date
please rate this thread