ASHRAE ISBD 2017 poster

1. Integrated Sustainable Building Design Competition 2017
Joydipto Bose Vignesh Mohankumar Ashutosh Dharap Pranav Mohan Parki Pinaki Acharya
Technical Advisor: Sushant Shetgeri Faculty Advisor: Dr. Stephen Terry
Project Overview
Financial Analysis
• The participants would like to thank Weston Hockaday, Kirby Lee, Adam Sippel, Rob
Armstrong and the rest of the ASHRAE Triangle Chapter for their guidance.
• The participants would also like to thank Elizabeth Bowen from the NC State University
Sustainability Office.
Envelope Construction
Water Conservation
• Life of the project was 50 years and the owner’s Required Rate of Return was 4%.
• The budget for construction was $200/sq.ft or $5.4 million.
• The baseline construction cost was $1.13 million whereas the proposed building cost $2.54
million. Hence the incremental initial investment required was $1.41 million.
• The annual savings involved the difference between the operating costs of the baseline
building and the proposed building. Annual operating costs consisted of electricity, sewage,
water and maintenance costs.
• Replacement costs for equipment/material were also considered for the appropriate period.
• The Internal Rate of Return was estimated to be 6.36% whereas the NPV was $1.88 million.
• The primary goal of achieving net-zero energy using renewable energy systems, energy
efficient technologies and advanced materials was successfully achieved.
• The construction cost for the proposed building was less than 50% of the budget available.
• An IRR of 6.36% was estimated for the proposed building whereas the MARR was 4%.
• Rainwater and greywater harvesting reduced the water consumption by 90.58%.
• A LEED Platinum rank was achieved according to the LEED v4 BD+C scoring criteria.
Lighting LEED Analysis
• In the Diego Ramirez archipelago, Isla Gonzalo was chosen as the site location.
• The climate is cold and humid (Climate Zone 6A) with no cooling required at any time.
• The design dry-bulb temperature for 99.5% heating was 25°F and relative humidity was
around 90% throughout the year.
• The annual average wind speed was around 22mph with a consistent WNW bearing.
Conclusions
HVAC System Selection
Renewable Energy Systems
• Carrier HAP was used for the design and selection of HVAC systems.
• Split AHUs with VAV boxes were used for residential spaces along with an ERV.
• Seven packaged rooftop units with CAV systems were used for the service stall areas along
with a HRV.
• A reduction of 46% was achieved for the EUI between the baseline and proposed designs.
• Indoor design conditions for the data center were 65°F and relative humidity of 50%.
• For a load of 22kW, a 7.5 ton CRAC unit was considered for cooling the data center.
Acknowledgement
• In spite of the isolated nature of the site (leading to a loss of 8 points) the proposed building
qualified for a Platinum rank (securing 80 points) based on the LEED v4 BD+C scoring criteria.
• Furthermore, the materials and resources section required additional assistance and
consulting to understand the details of the scoring criteria.
• A clear understanding of the above-mentioned section could secure additional points for the
building but by being conservative, no points were scored on this section.
• Annual energy consumption for the building was 755,000 kWh.
• Five different alternatives for wind turbines were analyzed.
• The Castellano wind turbine (150 kW) was chosen which generated 818,000 kWh annually.
• The PV array was sized using System Advisor Model (SAM) by NREL.
• The installation cost for the array was covered by a donor.
• The array produced 35,184 kWh of energy per year which was around 5% of the annual
energy need for the building.
• The capital cost for the array was $46,661 and the payback period was 8.6 years discounted
at 4% p.a.
• A LEED V4 Option 2 (single-point in time calculations) daylight analysis was conducted.
• The baseline design achieved acceptable daylight levels for 8% of the area at 9am and
13% of the area at 3pm on the required days.
• The proposed design achieved acceptable daylight levels for 78% of the area at 9am
and 80% of the area at 3pm on the required days leading to 1 LEED point for daylight.
• LED lighting and optimized control systems were installed that reduced electric energy
consumption from 67,411 kWh to 7,367 kWh or an 89% reduction.
• Water efficient fixtures such as waterless urinals and low flow faucets were used to
reduce water consumption by 47%.
• The site had sufficient precipitation for rainwater harvesting throughout the year. A
cistern (capacity: 82,000 gallons) was used to store and supply water when required.
• The rainwater harvesting system harvested 274,686.66 gallons of water annually.
• A greywater harvesting system that treated water from faucets, showers, dishwashers
and washers was used to supply water to the service stall areas.
• The greywater harvesting system saved 104,798.80 gallons of water annually.
• Total amount of water saved over the year was 379,485.46 gallons which amounted to
90.58% of the total consumption of water annually.
• Steel Structural Insulated Panels (SIPs) were chosen as the primary wall component due to
high R-values, stronger structural stability and increased air-tightness.
• Walls were constructed with R-30 SIPs containing an insulating core of Extruded
Polystyrene (XPS) between the two layers of sheathing.
• XPS has a slightly lower R-value than Polyurethane but a much lower permeability rating.
• Roxul RockBoard®60 insulation was used in interior walls of service stall areas as it has
excellent sound damping properties, fire-resistance and water/moisture resistance.
• R-40 SIPs (5.5” thickness) with XPS were used for roof construction.
• The roof includes a green roof (8994 sq. ft), a catchment area for rainwater harvesting and
a solar array.
• Skylights were introduced covering no more than 5% of the total roof area. GlassX Crystal
skylights with a triple-insulating glazing unit and salt hydrate (PCM) were used.
• Maximum allowable U-value is 1.42 while allowable SHGC is 0.40 (ASHRAE 189.1).
• Window 22 (argon filled double glazed) was selected as the best choice.
• Window 19 was not selected in spite of a lower U-value due to its higher costs.
Temperature Distribution
Wind Direction and Speed
Location: Isla Diego Ramirez
56.5° S, 68.7° W
Comparison of Insulating Materials Different Types of Windows
Water Conservation Measures (gallons)Annual Water Consumption (gallons)
Baseline Building Daylight
(9am and 3pm)
Power Curves
LEED Scorecard Compliance Matrix
Life Cycle Cost Analysis
Proposed Building Daylight
(9am and 3pm)
1st Floor
Mezzanine
1st Floor
Mezzanine
Zone selection
Design Conditions for Service Stalls
Comparison of EUI
Indoor Design Conditions
Castellano 150kW Energy Production Summary of Solar Array (SAM)
Solar Panel Specifications
50-year Cash Flow