Component 511:  Inlet Conduit (Duct or Pipe) by HVACSIM+

General Description
	In the Component 505 Conduit model, the inlet pressure is calculated 
from the outlet pressure and the  mass flow rate.  In the Component 511 Inlet 
Conduit model, the mass flow rate is calculated from the inlet and outlet 
pressures.  In all other respects, the two models are identical.

Nomenclature
	K - flow resistance coefficient
	DeltaP - inlet pressure minus outlet pressure
	w - mass flow rate

Mathematical Description
	Equation 1 in the Component 505 Conduit model is replaced by the 
following equation:
	w = sign(DeltaP)*(DeltaP/K)^0.5
Temperatures are calculated as described for the Component 505 Conduit model.

Component 511 Configuration
	Inputs		Description
	1	Pi	- inlet pressure
	2	Po	- outlet pressure
	3	Ti	- inlet temperature
	4	Tamb	- ambient temperature
	5	To	- outlet temperature
	Outputs		Description
	1	To	- outlet temperature
	2	w	- mass flow rate
	Parameters	Description
	1	hi*A	- inside surface heat transfer coefficient * area
	2	ho*A	- outside surface heat transfer coefficient * area
	3	Cm	- thermal capacitance of conduit material
	4	V	- volume of conduit
	5	K	- flow resistance coefficient
	6	H	- height of outlet above inlet
	7	MODE 	- -2 => water, detailed dynamics (one D.E.)
			  -1 => air, detailed dynamics (one D.E.)
			   1 => air, simple dynamics (no D.E.)
			   2 => water, simple dynamics (no D.E.)

Reference:
1.	HVACSIM+ Building Systems and Equipment Simulation Program Reference 
	Manual (NBSIR 84-2996)
	Daniel R. Clark
	United States Department of Commerce
	National Institute of Standards and Technology
	Gaithersburg, Maryland  20899-0001