overview of doe/ornl heat pump design model and use of web version
DESCRIPTION
Overview of DOE/ORNL Heat Pump Design Model and Use of Web Version. C. Keith Rice Oak Ridge National Lab January 2001. HPDM History General Capabilities HX Assumptions Solution Approach Application Modeling Design Analysis Off-Design Simulation Flow Control Types. Outline - First Part. - PowerPoint PPT PresentationTRANSCRIPT
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Overview of DOE/ORNL Heat Pump Design Modeland Use of Web Version
C. Keith Rice
Oak Ridge National Lab
January 2001
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Outline - First Part
• HPDM History• General Capabilities• HX Assumptions• Solution Approach• Application Modeling
– Design Analysis
– Off-Design Simulation
• Flow Control Types
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Outline - Second Part
• Web Version– Sample Run
– Input Screens
– Design Case
– Off-Design Setup
– Parametrics
– Plans
• Mark VI Version– Plans
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History of DOE/ORNL Heat Pump Model
MIT Origin ORNL Version Mark I Mark III1976 1978 1982 1985
(3 Programs) (1 Program) (Industry Workshop)
(First PC Version)
Variable-SpeedWith
Charge Inventory
Mark IV(MODCON)
Mark VI(GLIDEZ)
1988 1991-93 1994-97 1998-01
(Cap. Mod. Workshop)
(ECM Variable -Speed, Design Parametrics)
(Pure, Near-Azeo HFCs, Propane)
(More HFC-Capable, More HX Configs.)
Mark V(PUREZ)
Web Interface
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Applications of DOE/ORNL Heat Pump Model
MIT Origin ORNL Version Mark I Mark III1976 1978 1982 1985
Climate Master/GSHP Design ICP/HP Design, Ratings
Variable-SpeedWith
Charge Inventory
Mark IV(MODCON)
Mark VI(GLIDEZ)
1988 1991-93 1994-97 1998-01
Mark V(PUREZ)
ADL/CFC Mixtures,w-to-w HXs
Trane/Expert HX Design
LBL/RAC Standards
Battelle, Borg-Warner/Engine-Driven HPs
LBL/AC & HP Stds.
Allied/R-410A
Nordyne/ HP Design,Ratings
EPRI/vs RooftopEvaluation
Copeland(Windows Interface,Compressor Database)
Proctor - PG&E/Peak Cooling Designs
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General Capabilities
• Air-to-Air Heat Pumps– Steady-State Cooling and Heating – Hardware-Based Representations
• Fin-and-Tube HXs
• Compressor Performance Maps
• Single- or Variable-Speed Compr/Fans
– Explicit or Implicit Flow Controls
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Design/Simulation Capabilities
• Design or Off-Design Analysis– Charge Inventory Calculation or Balancing
• Sizing Options– For compressors and flow controls
• 1- or 2-Variable Parametrics
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HX Assumptions
• Parallel Equivalent Circuits– Equal Flow Split– Single Circuit Analysis– Much Faster than Tube-by-Tube
• But More Idealized
• No Circuit Branching
– Assumes a Well-Balanced HX Design• With Two-Phase Regions Dominant
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AirFlow
RefrigerantFlowSub-Circuit
Finned Tube Heat Exchanger With Parallel Circuits
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HX Assumptions
• Region-by-Region Refr.-Side Analysis– For Heat Transfer and Pressure Drop
• 3-Region Condenser, 2-Region Evap
– Crossflow Treatment of Airflow• Airflow Across Single-Phase Regions
Determined by Refr. Fraction
• Also Suitable When Single-Phase Regions Ahead of Two-Phase
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AirFlow
Determining Single Phase and Two-PhaseFractions of Heat Exchangers
L
Sub-CoolingRegion
Two-PhaseRegion
AirFlow
DesuperheatingRegion
L t = 4L as shown
Determining Refrigerant Region Fractions
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AirFlow
RefrigerantFlowSub-Circuit
Circuitry with Single-Phase Regions on Leading Edge
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HX Assumptions
• Air-to Refrigerant H.T. Within Regions– Effectiveness/NTU Relations– Single-Phase Regions
• Many-Row Unmixed on Both Sides
– Two-Phase Regions• Use Two-Phase Temp. At Average Pressure
• Configuration Independent
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Solution Approach• Successive Substitution (Sequential)
– Specify • Inlet Air Temps
• HX Exit Conditions/Control
• Or Design Charge in Place of One Condition
– Guess Saturation Temps
• Generally Fast, Stable Convergence– Always Solving a Real System– Easier to Trace Problems That May Occur
than with Simultaneous Solution Methods
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Solution Approach• Charge Independent Solution
– Specify Inlet Temps, Evap. Exit Superheat– Adjust Sat. Temps until – High-Side Convergence on
• Exit Subcooling -- if sizing flow controls• Mass flow -- if flow control specified
– Low-Side Convergence on• Specified Inlet Temp• At Specified Exit Superheat
– Determine Required Charge (optional)
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Solution Approach
• Charge Dependent Solution– Specify Refrigerant Charge
• In Place of One HX Exit Location
• Guess Cond SC or Evap SH for This Location
– Adjust Sat. Temps for Hi-/Lo-Side Bal• Find Charge for Guessed SC or SH
– Iterate SC or SH until Required Charge is Matched
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Application Modeling
• Design Analysis– Specify for Application
• Design Ambient Conditions
• Design Values of SC and SH
• And (optionally) Design Capacity
– Calculate • Required Charge and Flow Control Sizes
• And (optionally) Required Compressor Size
• Design Performance with Given HXs
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Application Modeling
• Off-Design Simulation– Specify for Application
• Off-Design Ambient Conditions
• Design Charge and Flow Control Type/Size
• Compressor Size
– Calculate • Cond SC and Evap SH
• Off-Design Performance with Given Equipment
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Cap Tube Flow Control -- Fixed Charge w Accum
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Flow Control Types• Explicit
– Capillary Tube(s)• with fixed SH or charge
– Short-Tube Orifice(s)
• with fixed SH or charge
– Thermal Expansion Valve (TXV)• Fixed Opening
– if fixed SH
• Variable Opening
– if fixed charge
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Flow Control Types• Implicit
– SH Control • fixed charge and SH
– SC Control• fixed charge and SC (SH may vary widely)
– SH/SC Control• fixed SC and SH• (simple way to approx. TXV, TEV)
– SH/SC Programmed Control • SC and/or SH controlled as F(ambient or speed)• Useful way to specify known SC/SH trends
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Web Addresshttp://erendev.nrel.gov/buildings/tools_directory/
DOE Web Site for Software Tools
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Web Version of HPDM
• Mark V • Single-Speed Only• 1-D Parametrics• Online X-Y Plots• Exportable Data
– Input & Output
Web Addresswww.ornl.gov/~wlj/hpdm/doehpdm.html
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Demo of Web Version
• Model Walk Through (shown online)– Overview of Input Sheets
– Sample Design Run• View Cycle Output
– Setup Charge/Flow Control Values for Off-Design Run
– Run Off-Design Ambient Parametrics• View Output Options
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Web Version of HPDM
• Mark V • Single-Speed Only• 1-D Parametrics• Online X-Y Plots• Exportable Data
– Input & Output
Web Addresswww.ornl.gov/~wlj/hpdm/doehpdm.html
Click Above To RunClick Above To Run
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Web Release Plans
• Mark V– Updated Web Version, Spring 2001
• Improved Input Screens
• New Output Screen
• Setup Option for Off-Design Analysis
• Off-Design SH/SC Control vs Ambient
• 2-D Parametrics and Plotting
• Online Documentation and Related Papers
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Example of Two-Variable Design ParametricsEER for a Range of Tube IDs and Circuits
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Mark VI Version
• More HFC-Capable– New Props for HFC Mixtures
• Improved Near-Critical and Transport Props for Existing Fluids
– HFC-Suitable Two-Phase H.T. • U. of I. ACRC Correlations
– HFC-Suitable Flow Controls• Cap- and Short- Tube Correlations
• Refrigerant-Specific and -Generalized as Avail
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Subcooled Enthalpy Corrections Are Needed For R-410A at Higher Condensing Temperatures
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Cooling COP Comparisons for R-410A Over a Range of Condensing Temps
With Different Property Representations
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Mark VI Version
• More HX Configurations– Circuit Branching
• Merging in Condenser Subcooled Region
– Circuit Arrangement• Initially 1- to N-Row CrossF
• Later Two-Phase with Glide Effect– Adding CrossCF, CrossPF
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Mark VI Version
• More Air- and Refr-Side Surfaces– Air-Side
• All New Correlations for Range of Surfaces– Default Fin Patterns Built-In
• Extra Fin Area Calculated Explictly
– Refrigerant-Side• Based on Augmented-Area-Ratio Input
• Better Airflow and Fan Power Tracking– with ambient
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Web Release Plans
• Mark VI– Initial Beta Release Web Version,
Summer 2001– Official Web Release, Fall 2001
• Link with Compressor Manuf Databases
– R-407C Capability To Follow Later