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PH02:BRK

Rendering of the PH02:BRK design.

 

 

PH02 is the second venture by the SDSU DoArch faculty and graduate students to design a single family residence in Brookings, SD that meets the Passive House Institute United States (PHIUS) standards. The project funding is ongoing and based on the sale of PH01. The initial funding came from a grant from the South Dakota Governor’s Office of Economic Development (GOED). The house 1500 SF with three bedrooms and two and a half baths on two stories. It is located on the northern side of the site with a lightwell on its southern face to maximize sun exposure. The single family home is located just to the north of PH01, it has a detached garage to the east with a courtyard space in between.

 

 

Envelope Assembly

Foundation
Foundation assembly section and diagram showing material layers as well as indicating water, thermal, and air management layers.
Wall
Wall assembly section and diagram showing material layers and indicating water, thermal, and air management layers.
Roof
Roof assembly section and diagram showing material layers and indicating the water, thermal, and air management barriers.

Site

Site & Zoning Analysis

PH02 is located in Brookings, SD within Climate Zone 6 & R-2 zoning. The project inhabits an infill site between PH01 and an existing residential home. The site is within walking distance to South Dakota State University, shown in blue, and downtown Brookings, SD in pink.

Climate zone map, site map, and Brookings map indicating the site.
Street view analysis of porch and door heights.
Site Plan
Site plan showing PH02:BRK's plan within the site and zoning constraints.
Formal Moves

PH02's site is an infill between the current pH01 and an existing home creating the condition of limited natural lighting across the site. What is revealed through the shadow study is during the winter solstice, PH01’s shadow casts across much of the site. In return a two-story dormer is added to PHO2 reaching for the southern light during the winter solstice and supplies light throughout the home. 

Formal moves show how the final form was derived from the original in relation to the neighborhood.

THERM

 The THERM software is used to analyze the key thermal bridge areas of the passive house. The main areas of concern are ground connections, second floor to structural framing connections and wall to roof assembly. The typical wall detail is also evaluated. The program allows for dxf underlays to then be traced over adding material identification to the drawing. The program supplies a large list of materials with all required calculable properties inputted. After choosing and interior and an exterior boundary and conditions on each side the program calculates the heat flow across the 2-d model creating various graphical outputs to analyze the model.

SIP Wall to Roof Analysis
Thermal heat analysis of the connection between the SIP wall and SIP Roof
SIP Wall to Second Floor Analysis
Thermal heat analysis of the connection between the SIP wall and the second floor.
SIP Wall to Ground
Thermal heat analysis of the connection between the SIP wall and ground

WUFI

Area & PHIUS Requirements

The software program WUFI was utilized to analyze the demand and load of both heating and cooling required to condition the house on a yearly basis. Starting with a simple SketchUp model consisting of only exterior wall planes and openings, the model was input into SketchUp along with vast amounts of data, diverse and the climate in the specific area in which the building was being built to the exact wall assemblage. Extensive inputs also included calculating light loads which will contribute to heating the house. Working through the extensive list of inputs the program would generate the said calculations informing if the project is within the range of acceptable energy loads and demands set forth by PHIUS.

Floor plans with volume areas and tables with passive house requirements and loads.

Solar Data

Solar Pathfinder Data

Solar Pathfinder is a solar shading device that the group used to determine the location and amount of shade on the site throughout the year. To use the Pathfinder, the user sets up the device at each corner of the future building and takes a photo of the clear reflective dome of the device, as seen to the right. The images of the device are then taken into the Solar Pathfinder Assistant to create a report of the daily shading values. Through the solar pathfinder study, we determined that the existing Passive House project will create shade on our site throughout most of the year. As a reaction to this condition, the design uses an extruded dormer on the south facade to draw light in. 

Solar pathfinder data arranged in charts and diagrams
Shadow Study

PH02's site is an infill between the current pH01 and an existing home creating the condition of limited natural lighting across the site. What is revealed through the shadow study is during the winter solstice, PH01’s shadow casts across much of the site. In return a two-story dormer is added to PHO2 reaching for the southern light during the winter solstice and supplies light throughout the home. 

Shadow studies showing the house in all seasons, winter & summer solstices, and the spring/fall equinox

Architectural Drawings

Plans
First and second floor plans
Layout
Exploded axial plans with a key showing the layouts for each floor
Graphic Sections
Graphic sections in relation to PH01 showing the entries, stairs, kitchens, and courtyard.
Elevations
Elevations from each of the cardinal directions
Elevation study of houses along the block highlighting stoops and heights.
SIP Structure
Exploded diagram showing the structure of the SIP Panels

Design

Schematic Design

To better understand and study the potential massing conditions of PH02, we produced a series of small massing models. From the initial development, two massing conditions with the most potential were identified and pushed forward. Moving forward with a singular mass with extrusion from the second level on street side, and a similar massing with the frame extruded and expressed at the entry. The next set of models investigated these two conditions in further detail. The second option was selected as the mass to develop in the final project. Below, the interior conditions of PH02 can be shown in a white base model, with the chosen exterior and massing condition enveloping it. 

Models showing the process to the final form as wells as the design of the final form.
Active System Design
Active system plans and diagrams.
Awning Design
Design details for the custom awning.
Courtyard Design
The design for the courtyard between the main house and garage.
Interior Design
Interior palette and rendering showing kitchen and stair details.
Custom Stair Design
Custom stair design and details on structure and assembly.

Images 

Student Work
Gif showing the interior spaces in the house.
Material designs for the house.
Elevations study showing houses to the left and right of PH02:BRK.
Structure model of PH02 showing ground, floor, and roof connections.
Students presenting PH02 to a reviewer panel.