Component 510:  'Grounded' Water or Air Split by HVACSIM+

General Description
	This component models the division of a flow stream into two flow 
streams.  It is referred to as 'grounded' by analogy to a grounded electrical 
junction:  the pressure at the center of the split is a constant, entered as a 
parameter.  Using as inputs the pressures at the two outlets, the subroutine 
calculates the pressure and mass flow rate at the single inlet and the mass 
flow rates at the two outlets.  The model assumes that the flow resistance 
parameter is the same for all three branches.  Care has been taken to ensure 
that correct results are obtained even when the flow direction of one or more 
flow streams is reversed.

Nomenclature
	K - flow resistance coefficient
	P - pressure
	w - mass flow rate

Subscripts
	0 - center of split
	1 - inlet
	2 - first outlet
	3 - second outlet

Mathematical Description
	w2 = sign(P0 - P2)*[(P0 - P2)/K]^0.5
	w3 = sign(P0 - P3)*[(P0 - P3)/K]^0.5
	w1 = w2 + w3
	P1 = P0 + sign(w1)*(K/2)*w1^2

Component 510 Configuration
	Inputs		Description
	1	P2	- pressure at first outlet
	2	P3	- pressure at second outlet
	Outputs		Description
	1	P1	- pressure at inlet
	2	w1	- flow rate at inlet
	3	w2	- flow rate at first outlet
	4	w3	- flow rate at second outlet
	Parameters	Description
	1	P0	- pressure at center of split
	2	K	- flow resistance coefficient

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