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Boilers.idf
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!===============================================================================
! Boilers.idf
!
! Performance curves for non-electric boilers
!
! Reference: Condensing Technology, Technical Series, Viessmann, 9446 803 - 1 GB Nov. 2004.
!
! The two curves below are meant to represent typical performance of non-electric boilers. These
! curves do not represent the sharp decline in efficiency at very low load conditions.
!
! Consult the manufacturer for specific performance characteristics of the actual boiler
! used in the simulation.
! Gas-fired condensing boiler
! Normalized boiler efficiency coefficiencts derived from two boilers;
! One with 40C supply, 30C return and one with 75C supply, 60C return
! Use curve below for a condensing boiler having a nominal thermal efficiency of 0.89.
! For the curve below, specify EnteringBoiler for the Efficiency Curve Temperature Evaluation Variable
!
! The objects and syntax in this dataset comply with EnergyPlus, Version 8.4.0 and above, unless otherwise noted.
! Version,
! 9.0; !- Version Identifier
Curve:Biquadratic,
CondensingBoilerEff, !- Name
1.124970374, !- Coefficient1 Constant
0.014963852, !- Coefficient2 x
-0.02599835, !- Coefficient3 x**2
0.0, !- Coefficient4 y
-1.40464E-6, !- Coefficient5 y**2
-0.00153624, !- Coefficient6 x*y
0.1, !- Minimum Value of x
1.0, !- Maximum Value of x
30.0, !- Minimum Value of y
85.0; !- Maximum Value of y
!
! Low temperature gas-fired boilers (non-condensing)
! Normalized boiler efficiency coefficients derived from multiple boilers with
! different operating temperatures.
! Use the curve below for a non-condensing boiler having a nominal thermal efficiency of 0.80.
! For the curve below, specify LeavingBoiler for the Efficiency Curve Temperature Evaluation Variable
!
Curve:Bicubic,
NonCondensingBoilerEff, !- Name
1.111720116, !- Coefficient1 Constant
0.078614078, !- Coefficient2 x
-0.400425756, !- Coefficient3 x**2
0.0, !- Coefficient4 y
-0.000156783, !- Coefficient5 y**2
0.009384599, !- Coefficient6 x*y
0.234257955, !- Coefficient7 x**3
1.32927E-06, !- Coefficient8 y**3
-0.004446701, !- Coefficient9 x**2*y
-1.22498E-05, !- Coefficient10 x*y**2
0.1, !- Minimum Value of x
1.0, !- Maximum Value of x
20.0, !- Minimum Value of y
80.0; !- Maximum Value of y
!
!
! The three curves below are meant to represent typical performance of constant
! temperature non-electric non-condensing boilers. Use these curves when simulating
! boilers where the boiler set point temperature does not change during the simulation
! and the outlet water temperature is constant. These curves should be used with a
! Theoretical Boiler Efficiency of 1 (i.e. normalized efficiency coefficients were derived
! assuming the boiler thermal efficiency was 1). Lower the Theoretical Boiler Efficiency to
! represent slightly lower efficiency boilers, the entire curve will shift downward in
! proportion to the reduction in Theoretical Boiler Efficiency.
!
! Consult the manufacturer for specific performance characteristics of the actual boiler
! used in the simulation.
!
! The figure below graphically illistrates the performance curves within the accuracy of
! a text type performance graph. An older type boiler (A) has a fairly flat efficiency at
! moderate to high part-load ratios. The efficiency for this boiler type falls off sharply
! at lower part-load ratios. A boiler manufactured circa 1983 (B) has a higher efficiency
! with only a moderate reduction in efficiency at lower part-load ratios. Efficiency decreases
! slightly as the boiler part-load ratio approaches 1. The new type boilers have a nearly
! constant efficiency curve with a slight upward bow in the middle of the part-load curve.
!
! 0.85| C C C
! | C B B B C
! Boiler | B B
! Efficiency | B A A A A
! | A
! |
! 0.65| A
! ---------------------------------
! 0 0.5 1
! Part-load Ratio
!
! A = Circa1975HighTempBoiler
! B = Circa1983MidTempBoiler
! C = NewerLowTempBoiler
!
! Old style high temperature boiler produced around 1975. Boiler temperature at 75C.
Curve:Cubic,
Circa1975HighTempBoiler, !- Name
0.626428326, !- Coefficient1 Constant
0.645643582, !- Coefficient2 x
-0.77720685, !- Coefficient3 x**2
0.313806701, !- Coefficient4 x**3
0.1, !- Minimum Value of x
1.0; !- Maximum Value of x
!
! Newer style moderate temperature boiler produced around 1983. Lower temperature limit 40C.
Curve:Cubic,
Circa1983MidTempBoiler, !- Name
0.751522818, !- Coefficient1 Constant
0.384597789, !- Coefficient2 x
-0.51156047, !- Coefficient3 x**2
0.200944063, !- Coefficient4 x**3
0.1, !- Minimum Value of x
1.0; !- Maximum Value of x
!
!
! New style low temperature boiler. No low temperature limit.
Curve:Cubic,
NewerLowTempBoiler, !- Name
0.83888652, !- Coefficient1 Constant
0.132579019, !- Coefficient2 x
-0.17028503, !- Coefficient3 x**2
0.047468326, !- Coefficient4 x**3
0.1, !- Minimum Value of x
1.0; !- Maximum Value of x