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CALRES Update Phase 1 Progress Report. April 22, 2009 Bruce Wilcox Phil Niles Ken Nittler. CALRES Update Progress Highlights. We have developed CZM (Conditioned Zone Model), a proof of concept hourly heating and cooling loads model for a single conditioned zone

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calres update phase 1 progress report

CALRES UpdatePhase 1Progress Report

April 22, 2009

Bruce Wilcox

Phil Niles

Ken Nittler

calres update progress highlights
CALRES UpdateProgress Highlights
  • We have developed CZM (Conditioned Zone Model), a proof of concept hourly heating and cooling loads model for a single conditioned zone
  • CZM features improved thermal mass, ventilation, and solar gain algorithms
  • We have compared CZM with measured hourly data
  • There is more work needed to integrate CZM into the calculation procedures for the 2011 Standards

Wilcox - CalresUp

agenda
Agenda
  • CALPAS1
  • UZM Attic Model
  • CALRES Update Project
  • Fort Wayne Validation Data
  • New CZM Model
  • Compare CZM and DATA
  • Next Steps

Wilcox - CalresUp

calpas1 history
CALPAS1History
  • Developed by Niles to calculate passive solar system performance for the CEC’s California Passive Handbook published in 1980
  • Focus was on passive solar heating and massive buildings
  • Descendents include
    • CALPAS3, CALRES, CNE, ENERGY10
    • Micropas

Wilcox - CalresUp

calpas1 context
CALPAS1Context
  • Mainframe computers had very limited calculation capabilities by modern standards and computer resources were a big constraint
  • Building simulations had to be radically simplified to allow annual calculations:
    • Micropas reduced year weather files
    • DOE2 room weighting factors

Wilcox - CalresUp

calpas1 network schematic
CALPAS1Network Schematic

Wilcox - CalresUp

uzm residential attic duct model
UZM Residential Attic/Duct Model
  • Developed for the 2008 CEC standards with PIER funding
  • Project Team:
    • Bruce Wilcox
    • Phil Niles
    • Ken Nittler
    • Larry Palmiter
    • Danny Parker
  • Approach
    • Detailed first principles algorithms
      • Separate radiant heat transfer
      • Variable heat transfer coefficients
      • All surfaces treated as massive
    • Calculation intensive (10 time steps/hr)

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california data comparison
California Data Comparison
  • One year of measured attic temperature data for Cardinal Glass research house in Roseville
  • Unoccupied, instrumented, ACM occupancy
  • Tile roof with high/low ventilation, sealed ducts in attic, ceiling construction defects, all modeled using proposed approach

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uzm matches attic temperature pattern for week including highest attic temperature of the year
UZM matches attic temperature pattern for week including highest attic temperature of the year

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cool shingle life cycle cost supports new requirement in hottest climates
Cool Shingle Life Cycle Cost Supports New Requirement in Hottest Climates

Based on UZM calculated TDV savings for 0.25 reflectance shingle compared to a 0.08 reflectance shingle in a prescriptive 1761 prototype.

First cost premium of 0.25 aged reflectance shingle is $0.35/ft2

Wilcox - CalresUp

calres update project 1 st phase approach
CALRES Update Project1st Phase Approach

The project team will start with the UZM attic space model developed by this team for the PIER Research for the 2008 Building Standards (contract 500-04-006) produce a proof of concept model with improved conditioned space ventilation and cooling related algorithms.

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calres update project 1 st phase objective
CALRES Update Project1st Phase Objective
  • demonstrate the algorithmic improvements using a single zone loads simulation

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calres update project 1 st phase goals
CALRES Update Project1st Phase Goals
  • Accurately model
    • solar gain impact (through glazing and opaque walls) on cooling energy and peak load
    • the impact of building shell and interior mass on cooling loads and indoor temperature variation
    • ventilation interaction with building mass and its impact on cooling energy and peak load

Wilcox - CalresUp

calres update project 1 st phase deliverables
CALRES Update Project 1st Phase Deliverables
  • A proof of concept hourly heating and cooling loads model for a single conditioned zone conventional wood framed slab on grade home
  • A comparison of 2008 CALRES and the improved model with measured hourly data for relevant homes with air conditioning and cooling ventilation
  • A brief report documenting the improved algorithms

Wilcox - CalresUp

cardinal test homes

Cardinal Test Homes

Fort Wayne Indiana

2003 - Present

slide21
2.8 ACH50

SLA = 1.4

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new czm features
New CZMFeatures
  • All opaque surfaces are calculated separately as mass elements (walls, floors, ceilings, interior walls, furniture)
  • Separate radiant and convective heat transfer calculation for all surfaces
  • Convective coefficients depend on
    • Surface orientation
    • Surface and air temperature
    • Room air movement from HVAC or venting
  • Solar gains on walls are lagged

Wilcox - CalresUp

czm network schematic
CZM Network Schematic

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calres update next steps
CALRES UpdateNext Steps
  • We have developed CZM (Conditioned Zone Model), a proof of concept hourly heating and cooling loads model for a single conditioned zone
  • CZM features improved thermal mass, ventilation, and solar gain algorithms
  • We have compared CZM with measured hourly data
  • There is more work needed to integrate CZM into the calculation procedures for the 2011 Standards

Wilcox - CalresUp

next steps standards calculation engine s
Next Steps Standards Calculation Engine(s)
  • Five Separate Functions (Engines)
    • Input Engine. Validates the building specification input by the user (e. g. no negative wall areas)
    • Standard Design Engine. Produces a Standard Design (Compliance, HERS, Tax Credit versions) for any building specification
    • Calculation Engine. Accepts machine readable input and returns energy, TDV, etc values
    • Compliance Engine. Assembles values from Proposed and Standard design runs and compares them to determine compliance.
    • Reports Engine. Accepts Compliance results and prints reports (CF1R, forms etc).

Wilcox - CalresUp

calresup development
CalresUp Development
  • Phase 1 demonstrating technical validity of zone model improvements. Remaining work:
    • Compare with CALRES2008 and DOE2
    • Report
  • Phase 2 Needed for 2011 Standards Team
    • Multiple conditioned and unconditioned with interactions. (CZM and UZM)
    • New window model with surface temperatures
    • Sky temperature algorithm for new weather files
    • Validation and Impact analysis
    • Can start 2011 Standards Development at this point

Wilcox - CalresUp

calresup development54
CalresUp Development
  • Phase 3 Needed for 2011 Stakeholders
    • Standard Design Engine. Produces a Standard Design (Compliance version) for any building specification
    • ACM Manual update
    • Can finish the 2011 Standards Development here
  • Phase 4
    • Input Engine. Validates the building specification input by the user (e. g. no negative wall areas)
    • Compliance Engine. Assembles values from Proposed and Standard design runs and compares them to determine compliance.
    • Reports Engine. Accepts Compliance results and prints reports (CF1R, forms etc).

Wilcox - CalresUp