department of mechanical and aerospace engineering master of science in renewable and clean

567 Pages·2014·13.43 MB·English

DEPARTMENT OF MECHANICAL AND
AEROSPACE ENGINEERING

MASTER OF SCIENCE IN RENEWABLE AND
CLEAN ENERGY

“INFORMATION DRIVEN BUILDING ENERGY ASSESSMENT
AND USE OF ENERGY INFORMATION IN SUPPORT OF
COMMUNITY ENERGY REDUCTION PROJECTS"

ANDRES GALLARDO

PROGRAMA DE BECAS CONVOCATORIA ABIERTA 2011

Building Energy Center

Energy Assessment Report
Miami Valley Fair Housing Center
505 Riverside, Dayton, OH

Audit Date: August 31, 2013
Report Date: September 16, 2013
Table of Contents
Executive Summary ..................................................................................................................................... 7
Summary of Assessment Recommendations and Comments ............................................................... 7
HVAC Recommendations ............................................................................................................................................ 7
Building Envelop Predicted Savings from new BID ......................................................................................... 7
HVAC Recommendations ............................................................................................................................ 8
Program thermostats for temperature setbacks and AC off during unoccupied times .................... 8
Install CO damper on ventilation system to eliminate unnecessary make-up ................................... 9
2
Building Envelope Recommendations ..................................................................................................... 10
Add insulation to exterior walls – Predicted Savings ................................................................................... 10
Add Insulation to Ceiling ........................................................................................................................................... 10
Replace Existing Windows ....................................................................................................................................... 11
Utility Analysis ........................................................................................................................................... 12
Summary ......................................................................................................................................................................... 12
Appendix – Detailed Calculations............................................................................................................. 14
Program thermostats for temperature setbacks during unoccupied times ........................................ 14
Install controllable damper on ventilation system to eliminate ventilation during evenings and
weekends......................................................................................................................................................................... 14
Preface

The University of Dayton Building Energy Center (UD BEC) has developed an audit process which
identifies the most effective energy savings options available for a facility and prioritizes them
according to shortest payback time. The first step in this process is a utility assessment which
analyzes a building’s energy use based on past utility bills and determines the amounts of energy
used for heating and cooling and daily functioning (baseline use) and benchmarks these uses to
comparable building averages for the geographic region. An onsite energy audit is then performed
to target specific energy and cost savings opportunities. Once the audit information is processed
and analyzed, the client is provided with a report describing the audit findings and detailing
priority savings recommendations.
Contact:
Tom Toberen: [email protected]
Executive Summary
Summary of Assessment Recommendations and Comments
HVAC Recommendations

Annual Annual Gas
Total Payback
Assessment Electricity Savings Annual Costs
Installation (Years)
Recommendation Savings (Therms) Savings
Cost
(kWh)
Program thermostats
for temperature
Immediate
setbacks and AC off 8,191 2,445 $2,285 $150
during unoccupied
times
Install controllable
damper on make- 2.9
- 340 $204 $~700
up air system

Building Envelop Predicted Savings from new BID

Annual Annual Gas
Total Payback
Assessment Electricity Savings Annual Costs
Installation (Years)
Recommendation Savings (Therms) Savings
Cost
(kWh)
Add insulation to
4.5
exterior walls 1,793 2,129 $1,457 $6,576*

Add insulation in
4.4
ceiling 485 575 $394 $1,736*
Replace Existing
42
Windows 1,020 1,211 $829 $34,800*
*Investment cost will vary based on actual BID for renovations
HVAC Recommendations
Program thermostats for temperature setbacks and AC off during unoccupied
times
Objective: Reduce energy used for heating and cooling.
Current Condition: Thermostat setpoints are assumed to be 70 F for both heating and cooling and
for occupied and unoccupied times.
Recommendation: We recommend using programmable thermostats to automatically set back the
thermostat settings when the facility is unoccupied (closed). The settings we recommend
are shown in the following table.
Cooling Season Thermostat Setpoint
Occupied Hours 74 F
Unoccupied Hours System Off

Thermostat Setpoint
Heating Season
68 F
Occupied Hours
55 F
Unoccupied Hours

Benefits: Reduce heating and cooling energy drastically. Annual savings around $2,285 per year
Costs & Rebates: There would be a small cost in purchasing programmable thermostats. However
payback is immediate.
Energy and Financial Summary:
Natural Gas
Electricity
2,445 therms
Annual Energy Savings 8,191 kWh
$1,467
Annual Cost Savings $818
$2,285
Combined Savings
$~50/programmable thermostat
Investment Costs
$150
Total Costs
Immediate
Payback

Energy Savings Description: See the appendix for details
Install CO damper on ventilation system to eliminate unnecessary make-up
2
Objective: Reduce heating energy.
Baseline condition: There is no damper and controller in the current ventilation system, which
means that it ventilates with outdoor air continuously-even in the evenings, and during
weekends and holidays, when there is nobody in the facility.
Recommendations: Add a CO controller and an outdoor air damper to the ventilation system,
2
which effectively is a 4” duct connected to the return air side of the ventilation unit for the
facility. The control system would include a 4” outdoor air damper that would be
controlled by a digital CO controller. This would allow make-up-air only when it is needed,
2
eliminating the extra heating cooling of outside air. Note: It is unlikely that significant make-
up air is needed.
Vendor: Waibel Energy Solutions.
Benefits: Reduce heating energy.

Energy and Financial Summary:
Total Implementation Cost (est.) $700
Annual Gas Savings (ccf) 340
Annual Cost Savings $204
Payback (years) 2.9

Energy saving description: See the appendix for details.
Building Envelope Recommendations
Add insulation to exterior walls – Predicted Savings
Objective: Reduce energy used for heating and cooling.
Current Condition: There is little or no insulation in exterior walls.
Recommendation: The new BID for 505 Riverside includes R-13 in new wall (reference Floor
Plans Notes lines 12, 13).
Benefits: Insulation in the walls will reduce heating and cooling energy required.
Costs & Rebates: The cost information for this installation is not listed in the BID currently, but
payback could be computed from the predicted costs and savings shown below. If we
estimate the installation cost to be ~$2/square-foot, then the payback can been seen below.
Energy and Financial Summary:
Natural Gas
Electricity
2,129 therms
Annual Energy Savings 1,793 kWh
$1,277
Annual Cost Savings $179
$1,457
Combined Savings
$6,576*
Investment Costs
4.5 years
Payback
*Note: Actual Costs will change based on BID outcome
Energy Savings Description: Energy calculations where performed in EnergySavingCalcTool,
developed and used by the UD BEC. These calculations take into account building
dimensions, typical temperature data, and building recommendations inputs to compute
new predicted energy use, from savings are calculated.
Add Insulation to Ceiling
Objective: Reduce heating energy.
Baseline condition: The building currently does not have any insulation above the drop ceiling.
The only barrier is the concrete ceiling with a small layer of fiberboard.