Small Office Savings Analysis

1
Small Office Savings Analysis

• RTF
• August 30, 2007

2
Summary

• Tested a dozen measures
• Tested sensitivities to climate, building size,
  HVAC system type, baseline assumptions
• Findings
• HVAC system type baseline conditions impact
  savings estimates
• Climate building size not big factors
• Package savings show modest range due to
  compensating effects of package

3
Electric Site Savings All Measures
4
Electric Savings by MeasureMean of all System
Types
5
Mean Gas Savings by MeasureMean of all System
Types
6
Interactive Electric Savings from LPDBy System
Type for Boise Seattle
7
Interactive Electric Savings from HVAC Equip.By
Location System Type
8
Windows Savings are Sensitive to the following

• Baseline assumptions for U SHGC
• Measure U value SHGC interact
• System Type
• Window area, window / wall ratio
• Climate
• Other measures in package

9
Window Baseline Assumptions
10
Interactive Elec. Savings from WindowsBaseline
to U40/SHCG40 By System Location
11
Interactive Elec. Savings from WindowsBaseline
to U35/SHCG30 By System Location
Window U35/SHGC30
12
Interactive Elec. Savings from WindowsCompare
U35/SHCG30 to U40/SHGC40
35/30
35/30
35/30
13
Interactive Gas Savings from WindowsCompare
U35/SHCG30 to U40/SHGC40
35/30
35/30
35/30
14
Cooling Ventilation Savings from Windows in
Gas-Heated
35/30
35/30
35/30
15
Electric Savings from Economizer Commissioning
16
Measure Cost Estimates
17
Measure Cost per Unit

• Windows 3.67 / sf glass, 30 window wall
  ratio
• LPD 37 / fixture, for 300 fixtures
• Lighting Controls 312 / sensor, for 50 open
  office
• CEE Tier 2 155 / ton small, 120/ton large
• Fan Power 50 / ton
• Economizer Cx 250/unit 10 units for small,
  500 large
• Cool Cap Redux -1000/ton (this is a cost
  reduction)
• Wall Insulation 3.85 / sf floor
• Roof Insulation .64 / sf floor

18
Measure TRC Cost-Effectiveness Seattle
19
Measure TRC Cost-Effectiveness Boise
20
Package TRC Cost-Effectiveness
21
Electric Bus Bar Savings All Measures
22
Weighted Savings B/C

• TRC B/C Ratio 1.2
• Savings 2.0 kWh/sf site and 2.1 kWh/sf at bus
  bar
• Weighting Factors
• Commercial Valuation from FW Dodge
• HVAC System type heat fuel for lt 100ksf from
  CBSA NEEA
• Code jurisdiction for window baseline savings

23
The End