PCC-IV Instruction Manual (Rev. 0.1)
Page 6-8
Section 6
– Blockware Functions
Technical Reference
5. Radiation (boiler sheathing) heat loss is a nearly constant Btu/hr rate (i.e., a fixed
quantity, but not a fixed percentage of Btu Input)). Enter as a Percentage of maximum firing
rate Btu Input. Radiation Loss = [(Parm 5 * 100) / Input 5]
6. Typical "Units of Fuel" are:
Liquid and Solid Fuels:
Moles/100 lbs. Fuel burned
Million Btu/100 lbs Fuel burned
Gaseous Fuels:
Moles/Mole of Fuel burned
Million Btu/Mole of Fuel burned
7. Contact Preferred Instruments for Parameter values for other fuels. Constants for any fuel
can be calculated if the chemical analysis of the fuel is known.
F31
[HSEL] High Select
Function
HSEL
selects the greater of the three Inputs and copies that value to its Block Output. If there are only
two Inputs, connect either one of the two active Input Block numbers to the third Input.
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NAME: HSEL SINGLE USE FUNCTION: N OUTPUT TYPE: A
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Input Type Description Notes
_____________________________________________________________________________________________
1 A A INPUT
2 A B INPUT
3 A C INPUT
No Parameters
F32
[LSEL] Low Select
Function
LSEL
selects the lowest (i.e. smaller) of the three Inputs and copies that value to its Block Output. If
there are the only two Inputs, connect either one of the two active Input Block numbers to the third Input.
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NAME: LSEL SINGLE USE FUNCTION: N OUTPUT TYPE: A
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Input Type Description Notes
_____________________________________________________________________________________________
1 A A INPUT
2 A B INPUT
3 A C INPUT
No Parameters
