Improved estimation of exterior film coefficient

 
  • Exterior convective coefficients were overestimated in the standard treatment (ASHRAE, DOE2)
  • The result was an overestimate of savings potential for more efficient windows
  • Our improved film coefficient formula has been included in DOE2.1E

 

CONVECTIVE_FILM_COEFF.JPG (297663 bytes)

 

For further information:
M. Yazdanian and J. H. Klems, Measurement of the Exterior Convective Film Coefficient for Windows in Low-Rise Buildings, ASHRAE transactions, v100, Pt. 1, pp 1087-1096, 1994. LBL-34717.