Advanced RTU Campaign Energy Savings Calculators · Based on energy and power cost savings from...
Transcript of Advanced RTU Campaign Energy Savings Calculators · Based on energy and power cost savings from...
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Advanced RTU Campaign
Energy Savings CalculatorsSeptember 23, 2013
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Agenda
Overview of the Advanced RTU Campaign
RTU Evaluation Methodology
RTU Comparison Calculator
179D DOE Calculator
Better Buildings Alliance1
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Overview of the Advanced RTU Campaign
Michael Deru, NREL
Better Buildings Alliance2
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Advanced RTU Campaign (ARC) Overview
National campaign for promotion
and support of high-efficiency RTU
replacements and retrofits
Partnership between DOE,
ASHRAE, RILA, and several
supporting organizations
Launched May 30, 2013 and runs
through November 2014
www.advancedrtu.org
Better Buildings Alliance3
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RTU Evaluation Methodology
Michael Deru, NREL
Better Buildings Alliance4
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Decision Tree for Evaluating RTUs
Better Buildings Alliance5
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RTU Comparison Calculator
Ed Smyth, KEMA
Anne Wagner, PNNL
Better Buildings Alliance6
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Rooftop Unit Comparison Calculator
Why use it?
What is it?
Who can use it?
Where is it and what does it look like?
What results does it provide?
How do learn how to use it?
Better Buildings Alliance7
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Why create a calculator?
Situation:
High efficiency rooftop units best serve building owners.
Condition:
Building owners encounter difficulty justifying the selection and
procurement of high efficiency rooftop units.
Question > How can we reduce this difficulty?
Solution:
The RTU Calculator makes for easy comparison between two rooftop
units to provide better justifications for choosing a high efficiency unit.
Better Buildings Alliance8
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Key Features
Compares RTUs lifetime energy cost savings at various efficiency levels
Fully web-based and menu-driven format
Quickly estimates life cycle cost, simple payback, return on investment,
and savings-to-investment ratio
Simulates operation under
– specific climate conditions at one of 237 U.S. locations
– user-specified AC requirements and building-use patterns
Download results as graphic files and tables for further analysis and
presentation
Better Buildings Alliance9
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Rooftop Unit Comparison Calculator
Why use it?
What is it?
Who can use it?
Where is it and what does it look like?
What results does it provide?
How do learn how to use it?
Better Buildings Alliance10
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Tool’s Intent
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Simple, basic
Inputs and
assumptions
Broad estimates
For outcomes
Detailed,
Complex inputs
Close estimates
For outcomes
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Tool’s Intent
Better Buildings Alliance12
Simple, basic
Inputs and
assumptions
Broad estimates
For outcomes
Detailed,
Complex inputs
Close estimates
For outcomes
R T
U C
A L
C U
L A
T O
R
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Comparison of Other Tools
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Complex Tool – large
learning curve to use
Simple Tool –
easy to use and
understand
Simplified Level of Analysis Detailed Level of Analysis
EASE OF USE
TYPE OF
COMPARATIVE
ANALYSIS
EnergyPlus
HAP/Trace
FEMP Calculator
MN Utilities
Honeywell RTUCC
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Multiple Tiers
Default interface for quick investigations of
high efficiency units by:
Building Type, Location (City)
Occupancy Schedule
Building Temperature Settings
Equipment size and efficiency
Economizer Use
Equipment Lifetime and Number of Units
Electric Rates and Discount Rates
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Two-tiered system of inputs:
simple queries and sophisticated comparisons
Advanced controls so that users can also
manipulate (use defaults otherwise):
Interior Humidity Conditions
Fraction of Load that is Solar and Internal
Gains
Ventilation Rate
Power split between fan, compressor, and
auxiliaries
Inputs for Spreadsheet Data
Equipment Degradation Factor and Ratio
of Sensible to Total Capacity
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Rooftop Unit Comparison Calculator
Why use it?
What is it?
Who can use it?
Where is it and what does it look like?
What results does it provide?
How do learn how to use it?
Better Buildings Alliance15
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Better Buildings Alliance16
Rooftop Unit Comparison Calculator
http://www.pnnl.gov/uac/
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www.pnnl.gov/uac/
Better Buildings Alliance17
Opening page describes use and purposes
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Rooftop Unit Comparison Calculator
Why use it?
What is it?
Who can use it?
Where is it and what does it look like?
What results does it provide?
How do learn how to use it?
Better Buildings Alliance18
![Page 20: Advanced RTU Campaign Energy Savings Calculators · Based on energy and power cost savings from envelope, lighting, HVAC, and hot water improvements over 90.1-2001 179D Federal Tax](https://reader035.fdocuments.in/reader035/viewer/2022062921/5f03ba157e708231d40a78ce/html5/thumbnails/20.jpg)
Drop Down Choices
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Drop Down Menu
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Selecting Advanced Features
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Setting Building Use
Better Buildings Alliance21
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Example – Rochester Medium Office Setting
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Setting Unit Configurations
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Setting Utility Rate, Cost-of-Money, and Equipment
Life
Better Buildings Alliance24
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Enter “Submit” to do the Calculations
Better Buildings Alliance25
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Output Results s
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Results Table is the same
with bin calculations hidden
or shown
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Output Results – Optional Bin Calculation Outputs
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Bin Calcs: Equipment
Performance – Standard Unit
Bin Calcs: Loads and Hours -
Standard Unit
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Optional Bin Calculation Outputs
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Added
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Simple Assistance
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Move your cursor over a question mark near a
controls name to display a help tip. Click on the
question mark for more detailed information
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Rooftop Unit Comparison Calculator
Why use it?
What is it?
Who can use it?
Where is it and what does it look like?
What results does it provide?
How do learn how to use it?
Better Buildings Alliance30
![Page 32: Advanced RTU Campaign Energy Savings Calculators · Based on energy and power cost savings from envelope, lighting, HVAC, and hot water improvements over 90.1-2001 179D Federal Tax](https://reader035.fdocuments.in/reader035/viewer/2022062921/5f03ba157e708231d40a78ce/html5/thumbnails/32.jpg)
Detailed Help
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Detailed information in
Controls Help
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Additional Information
Better Buildings Alliance32
Visit the engineering methods pages for additional
background information on the RTUCC.
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Supporting Documentation
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Detailed Explanations
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Next Steps
Use the tool for a sales presentation, or have your customer use the
tool to satisfy their need to justify costs.
Discuss proper sizing and installation – use the ASHRAE/ACCA
Quality Installation Standard 5 as a reference.
Discuss proper maintenance cycle and steps – use the
ASHRAE/ACCA Quality Maintenance Standard 180 as a reference.
Better Buildings Alliance35
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179D DOE Calculator
Michael Deru, NREL
Better Buildings Alliance36
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Federal tax deduction for energy efficient commercial building properties
Based on energy and power cost savings from envelope, lighting, HVAC, and hot water
improvements over 90.1-2001
179D Federal Tax Deduction
Fully
Qualifying
Property
Partially Qualifying Properties Interim
Lighting
RuleEnvelope HVAC
and
SWH
Lighting
Savings
Requirements
50%
50%
10%
10%
20%
15%
20%
25%
25%-40%
lower LPD(50% for
warehouses)
Tax
Deduction
$1.80/ft2 $0.60/ft2 $0.60/ft2 $0.60/ft2 $0.60/ft2
Times
applicable
percentage
Require hourly energy simulations No simulations
179D DOE Calculator
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Web-based tool for quick estimates of
energy and power cost savings for partial
qualifying properties for envelope, lighting,
or HVAC
Regression models of 250,000 pre-
simulated runs
12 building types from the DOE Reference
Building Models
16 locations to represent all 15 climate
zones plus southern California coast
mapped to zip codes
What is the 179D DOE Calculator?
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179D DOE Calculator Building Models
Sector Building Activity Area ft2 Floors Shape% of Building
Stock
Office
Small Office 5,500 1 4.5%
Medium Office 53,630 3 4.8%
Large Office 498,588 12 2.7%
School Primary School 73,960 1 4.0%
Retail
Stand-alone Retail 24,962 1 12.2%
Strip Mall 22,500 1 4.5%
Supermarket 45,000 1 1.2%
Food serviceQuick Service Restaurant 2,500 1 0.5%
Full Service Restaurant 5,500 1 0.5%
Lodging Small Hotel 43,200 4 1.4%
Residential Midrise Apartment 33,740 4 5.9%
Storage Warehouse 52,045 1 13.4%
Total 55.5%
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179D DOE Calculator Capabilities
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Can Model
Envelope
– U-values and solar reflectance
– Window U-value and SHGC
Lighting power reductions
HVAC
– Packaged HVAC efficiency
– Central plant efficiency
– Variable speed fans
– Air source heat pump
Hot water system efficiency
Cannot Model
Envelope
– Skylights
– High window-to-wall ratios
Lighting
– Daylighting controls
HVAC
– Alternate HVAC systems or control
strategies
Combined savings for envelope, HVAC,
and lighting EEMs
Mixed use buildings
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179D DOE Calculator
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http://apps1.eere.energy.gov/buildings/commercial/179d
Click here to start using the calculator
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179D DOE Calculator Example
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Retail building, 35,000 ft2
15 year old RTUs
2 20-ton and 2 15-ton RTUs
Location: Baltimore, MD
ZIP – 21230
1. Select the building type
2. Enter ZIP code
3. Enter building area
4. Project information (optional)
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179D DOE Calculator Example (page 2)
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5. Check eligibility of the 179D
calculator for tax purposes based
on basic building information (can
always use the calculator for
estimating savings)
6. Select system(s) to evaluate
(can check 1 or all 3, but each
system is treated separately)
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179D DOE Calculator Example (page 3)
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7. Enter your system data
Three solutions: baseline, your
building, and most efficient
Savings and eligibility for
tax deduction
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179D Reports Approved by IRS as proof of qualification
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Contacts
ARC web site: www.advancedrtu.org
RTU Comparison Calculator: http://www.pnnl.gov/uac/
179D DOE Calculator: http://apps1.eere.energy.gov/buildings/commercial/179d/
ARC:
Michael Deru 303-384-7503 [email protected]
Andres Potes 919-943-7291 [email protected]
RTU Comparison Calculator:
Anne Wagner 503-417-7569 [email protected]
NYSERDA HVAC Business Partners:
Lou Tisenchek 518-266-9360 x306 [email protected]
Tim Devine 518-266-9360 x302 [email protected]
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