Insulated Pipe
by International Energy Agency

	This is a simplified pipe model.  The heat exchange coefficient is 
supposed constant and is given as a parameter.

1/AU = 1/ho/Ao + e/k/Am 	cfr Annex 10 data bank (S13)
        outer   insulation
       surface

ho = hc + hr is calculated with t0 = 30 and tamb = 15 that 
gives AU' = .22 W/m/k

         (tsu-tamb)*(1-EXP[-AU/dmdt/cp])
tex = -------------------------------------
	     EXP[-AU/dmdt/cp]

dQ     dm 
--- = ---- * cp * (tsu - tex) 
dt     dt

No dynamic nor time delay are modelized.

Ref: IEA ANNEX17:BEMS Synthesis Report  Univ. of Stuttgart
	June 27, 1991   AN17-910627-01