o ak r idge n ational l aboratory u. s. d epartment of e nergy 1 status of web versions of the...

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OAK RIDGE NATIONAL LABORATORYU. S. DEPARTMENT OF ENERGY

Status of Web Versions of the DOE/ORNL

Heat Pump Design Model

C. Keith Rice

Oak Ridge National Lab

Fall 2002

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View Program Description

Listed on DOE Web Site for Software Tools

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Web-Based HPDM

Fully Accessible Online from Browser

Design and Operating Parametrics Online Plots/Tables Exportable Data Sets

Input & Output

Available Web VersionsOriginal Mark V

New Mark VI

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Web-Based HPDM Has HadIncreased Use Over the Last Year

Nearly 15,000 Uses of Web Model in Last Year

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Listed in DOEOnline Software Tools

1st Upgrade

Adopted by Mid-Size Manuf.

Further Web Model Upgrades

Mark VI Model Release

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New Mark VI Web Model Features

Improved HFC Properties and HT Correl’s Condenser Circuit Merging Capability Improved Airflow Calculation Options

Fixed flow for manuf. performance tables or Mass flow varying with fan inlet conditions

More Air- and Refrig-Side Surface Choices User-specified fin patterns Automated comparison of fin types

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Mark VI Model Improvements

More HFC-Capable New Props for HFC Mixtures

Improved Near-Critical and Transport Props HFC-Suitable Two-Phase H.T. Coefficients

Evaporating and Condensing HFC-Suitable Flow Controls

Cap- and Short- Tube Correlations for R-410A

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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 TempsWith Different Property Representations

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Improved Transport Properties

Updated Correlations for HFC Mixtures From Allied (93) to Geller (2000) For viscosity, thermal conductivity Specific heats calculated from thermo props

Updated Liquid Viscosity Correlation for R-22 From ASHRAE (76) to curve fit to RefProp6 (01)

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Improved R-410A Transport Properties- - Viscosity - -

40 60 80 100 120 140 160 1800.0

0.1

0.2

0.3

0.4

0.5

Temperature (F)

Vis

cosi

ty (

lbm

/hr-

ft)

f,Allied(93)

f,Geller(00)

f,Geller(00)

f,RefProp6(99)

f,RefProp6(99)

gs,Allied(93)

gs,Allied(93)

gs,Geller(00)

gs,Geller(00)

gs,RefProp6(99)

gs,RefProp6(99)

Viscosity of R-410A Sat. Liquid and Vapor

f,DuPont(95)

f,DuPont(95)

gs,DuPont(95)

gs,DuPont(95)

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Improved R-410A Transport Properties- - Thermal Conductivity - -

40 60 80 100 120 140 160 1800.00

0.01

0.02

0.03

0.04

0.05

0.06

0.07

Temperature (F)

Co

ndu

ctiv

ity

(Btu

/hr-

ft-R

)

kf,Allied(93)

kf,Geller(00)kf,Geller(00)

kf,RefProp6(99)kf,RefProp6(99)

kgs,Allied(93)kgs,Allied(93)

kgs,Geller(00)kgs,Geller(00)

kgs,RefProp6(99)kgs,RefProp6(99)

Thermal Conductivity of R-410A Sat. Liquid and Vapor

kf,DuPont(95)kf,DuPont(95)

kgs,DuPont(95)kgs,DuPont(95)

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Improved R-22 Transport Properties- - Liquid Viscosity - -

-60 -20 20 60 100 140 180 2200.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

1.00

Temperature (F)

Vis

co

sit

y (

lbm

/hr-

ft)

Viscosity of R-22 Sat. Liquid and Vapor

f,EES(99)

f,EES(99)

gs,EES(99)

gs,EES(99)

f,ASH(93)

f,ASH(93)

gs,ASH(93)

gs,ASH(93)

f,ASH(76)

f,ASH(76)

f,RefProp6(99)

f,RefProp6(99)

gs,ASH(76)

gs,ASH(76)

gs,RefProp6(99)

gs,RefProp6(99)

f,RefProp6,f it(01)

f,RefProp6,f it(01)

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Transport Property Comparisons

Summary of Changes from Mark V Version much lower liquid viscosity values for both R-410A and

R-22 somewhat higher vapor viscosity values for R-410A higher to lower liquid conductivity values for R-410A much higher vapor conductivity values for R-410A

Versus REFPROP 6 for R-410A Within 10% agreement on viscosity values 10 to 20% lower liquid conductivity values up to 55% lower vapor conductivity values

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HFC-Suitable Two-Phase H.T. Coefs.

Condensing --Dobson/Chato (1994)

Evaporating -- Bivens/Yokozeki (1994)Dryout point set at 0.90, interpolate to vapor values at x=1

For R-410A, 25% lower condensing and 35% lower evaporating h.t. coefs than previous R-22 based correlations

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HFC-Suitable Flow Control Correlations

Using Refrigerant-Specific for Best Accuracy

R-410A Specific Cap-Tube Correlation (Rice 2001) refit of Wolf et al (1995) R-410A-Specific Correlation used instead of ASHRAE generalized cap-tube

correlation (Wolf et al 1998) latter found to be flawed due to viscosity property

changes (see plot which follows)

R-410A Short-Tube Orifice Correlation (Payne 1999)

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Capillary Tube Mass Flow Predictions with Generalized ASHRAE Model

Using Different Transport Property Correlations

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Cap Tube Mass Flow Predictions with Revised R-410A Specific Correlation (Rice 2001)

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New HX Model Features: Refrigerant-Side

More HX Configurations Circuit Branching

Merging in Condenser Subcooled Region

Circuit Arrangement 1- to N-Row Crossflow, 2-to-N-Row Condenser CrossCounterflow

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New HX Model Features: Air-Side Improved Airflow Calculation Options

Fixed flow for manuf. performance tables or Mass flow varying with fan inlet conditions

More Air-Side Surface Choices User-specified fin geometry patterns

default fin geometries built-in Extra fin area calculated explicitly Automated comparison of fin types

Samples of New Web Pages Follow Additions highlighted

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New Mark VI Indoor Coil Page

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Available Fin Pattern Geometry Selections

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Online Fin Geometry DiagramsSlit-Fin Pattern

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New Air-Side Surface CapabilitiesIndoor Coil

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New Air-Side Surface CapabilitiesOutdoor Coil

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Improved Dry vs Wet Coil Corrections

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Improved Airflow and Fan Power Calculation Options Now Based on Standard Airflow (scfm)

Rather than on inlet airflow (acfm) at rating conditions

Two Options for Specifying Airflow Fixed flow for manuf. performance tables

needs only required scfm (fixes air massflow) Mass flow varying with fan inlet conditions

models cooling- vs heating-mode air massflow and fan power changes in a fixed application

needs scfm at reference fan inlet temperature mass flows and fan powers can vary up to 10% for indoor to > 20% for

outdoor units

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Compressor Model Improvements

New Compressor Model Capabilities New Motor Curves from Compressor Manuf

SOA single-phase, including over- and under-voltages give better estimates of motor speed and eff,

volumetric eff., For Nominal-, Under-, and Over-Voltages

enable prediction of reduced voltage effects at peak conditions

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Updated Built-In Motor Performance Curves -- Single-Phase, 2-3/4 Hp Compressor Motor --

Speed/Torque Data for Range of Voltages

Motor Speed vs Load and Voltage

2400

2600

2800

3000

3200

3400

3600

0.0 1.0 2.0 3.0 4.0 5.0

Fractional Torque

Sp

ee

d Speed, 230V

Speed, 187V

Speed, 253V

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Updated Built-In Motor Performance Curves -- Single-Phase, 2-3/4 Hp Compressor Motor --

Efficiency/Torque Data for Range of Voltages

Motor Efficiency vs Load and Voltage

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10

20

30

40

50

60

70

80

90

100

0.0 1.0 2.0 3.0 4.0 5.0

Fractional Torque

Eff

icie

ncy Effic, 230V

Effic, 187V

Effic, 253V

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Further Model Improvement and Testing -- ASHRAE 1173-TRP

Objective Wide-Range Testing of Public AC Models

Mild to Extreme Ambients Low to High Indoor Humidity

Low to High Charge Low to High Airflow

For HFC R-22 Alternatives With Best Available H.T. and Charge Models

ORNL & Purdue Public Models To Be Improved/Tested/Validated

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Planned Web HPDM Capability in 2003

Built-in Compressor Manuf. Data online access to rated performance, map

coefficients, and hardware info

Gliding-Refrigerant-Capable Version HFC R-407C

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