ASHRAE IESNA Standard 90 1 Future 90 1

ASHRAE/ IESNA Standard 90. 1 Future 90. 1 Economic Analysis Methods Joseph J. Deringer, AIA Principal, The Deringer Group, Inc. Berkeley, CA ASHRAE Summer Meeting Nashville, TN - 28 June 2004 Future Economic Analysis Methods for 90. 1

Current Status n n Envelope Lighting HVAC ECB Future Economic Analysis Methods for 90. 1 Slide 2 - 28 June 2004

Objectives (from Envelope perspective) n Improve accuracy n Increase stringency n Better address special cases n Better address quality & design issues Future Economic Analysis Methods for 90. 1 Slide 3 - 28 June 2004

A 4 Phase Optimization Program n Long Range Program n n n Toward High performance buildings (even zeroenergy buildings) Toward integration with environmental rating systems (e. g. LEED) Envelope focus n n Get one’s own house in order 1 st But would welcome broader application Future Economic Analysis Methods for 90. 1 Slide 4 - 28 June 2004

The 4 Phases 1. 2. 3. 4. Refine Current Optimization Method Refine underlying analysis methods Add Advanced technologies Advanced optimization methods Future Economic Analysis Methods for 90. 1 Slide 5 - 28 June 2004

Ph. 1 – Refine Current EA Method n n Objective: to obtain @ “ 20%” savings in energy use from envelope. Refinements: a. b. c. d. e. f. New 8 zones / old 26 zones Economic variables Costs – national vs. regional Envelope Impacts on HVAC Update fen. costs / options Quality & Design Issues Future Economic Analysis Methods for 90. 1 Slide 6 - 28 June 2004

Ph. 1 a – New 8 zones / old 26 zones n New addendum approved to go from 26 to 8 climate zones n Can compare impacts of sets of zones Future Economic Analysis Methods for 90. 1 Slide 7 - 28 June 2004

Ph. 1 b – Impacts of changing “scalar” n Examining impacts on envelope criteria from systematic changes in economic objects n Scalar 8 to 24 Future Economic Analysis Methods for 90. 1 Slide 8 - 28 June 2004

Ph. 1 c - National & Regional Costs n Fuel & Construction Costs n National Fuel costs have been used for 90. 1 -1999 / 2001 n n A blended cost of gas and electric We are exploring impacts of using regional costs n Preliminary analyses uses multipliers on national average costs n Fuel multipliers derived from LBNL Tariff Analysis Project (TAP) n Construction cost multipliers derived from FW Dodge. n So far have used simplified zones to apply multipliers Future Economic Analysis Methods for 90. 1 Slide 9 - 28 June 2004

Ph. 1 d – Envelope Impacts on HVAC Sizing Costs n Includes: n All previous analyses ignored envelope impacts on HVAC sizing. n Current analysis accounts for incremental differences in HVAC cost due to sizing impacts n Preliminary analysis using CLTD method Future Economic Analysis Methods for 90. 1 Slide 10 - 28 June 2004

Ph. 1 d – Envelope Impacts on HVAC Sizing Costs (cont. ) n Includes: n Some exploration of using RTS method n This is not completed Future Economic Analysis Methods for 90. 1 Slide 11 - 28 June 2004

Ph. 1 e – Update Fenestration Costs n n All construction costs are from 1990 s Knew important fenestration cost changes had occurred Analysis of costs in 2003 Major reductions in cost of selective low-e Future Economic Analysis Methods for 90. 1 Slide 12 - 28 June 2004

Ph. 1 f - Quality / Design Issues n Examples being considered n Minimum VLT n Tinted glazing – impacts of constraining or eliminating from optimization n Tinted glass not used in SP-102 SHGC results n External shading (projection factors) n Frames – impacts of constraining or eliminating certain frame types from optimization Future Economic Analysis Methods for 90. 1 Slide 13 - 28 June 2004

Ph. 2 – Refine underlying analysis methods n n Underlying Energy analysis methodology is about 10 years old Does not incorporate recent techical advances Need to re-do the underlying energy analysis Use latest tools, methods, technologies, e. g. , n n n Energy Plus Gen. Opt Consider replacing regression equations with direct optimization using multiple simulation runs Future Economic Analysis Methods for 90. 1 Slide 14 - 28 June 2004

Ph. 2 – Refinements being considered (part 1) 1. 2. 3. 4. 5. 6. Improve weighting factors Angle-dependent SHGC to replace old SC Combined analysis of U and SHGC Climate-dependent external shading credit Refine Daylighting analysis Better integration of inter-system impacts n n n Daylighting HVAC sizing Peak load & annual energy Future Economic Analysis Methods for 90. 1 Slide 15 - 28 June 2004

Ph. 3 – Include Advanced technologies n n n Will soon be at limit of current technologies Add advanced technologies to mix Toward High performance buildings Toward zero-energy Buildings Include more system integration in analysis Future Economic Analysis Methods for 90. 1 Slide 16 - 28 June 2004

Ph. 3 – Include Advanced technologies n Examples n n Advanced envelope with integrated Daylighting Active envelopes / shading systems Active envelopes / ventilation systems Etc. Future Economic Analysis Methods for 90. 1 Slide 17 - 28 June 2004

Ph. 4 – Advanced Optimization Approaches n n Integrate with environmental rating systems Vector analyses across multiple factors, e. g. n n n Annual energy Peak Visual and thermal quality Material recycling Climate change impacts on buildings n E. g. Future Washington DC n n HDD x 0. 5 CDD X 5. 0 Future Economic Analysis Methods for 90. 1 Slide 18 - 28 June 2004

Future Economic Analysis Methods for Standard 90. 1 Q&A ASHRAE Summer Meeting Nashville, TN - 28 June 2004 Future Economic Analysis Methods for 90. 1