Design Optimization Techniques

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1 Design Optimization Techniques Structural Finite Element Analysis Lighting Natural / Glare Analysis Mechanical Energy Analysis Tools US DOE comparison of tools: buildings/tools_directory 1

2 Analytical Tools Lighting & Visualization Visualization Day-Lighting 2

3 Analytical Tools Day-Lighting Notes The NRB facility (highlighted in red) will be generally unobstructed by adjacent site buildings in regard to solar exposure. The link partially obscures the west wing in the morning and the east wing in the afternoon. 3

4 Analytical Tools Day-Lighting and Glare Notes While a large, un-shaded area of glazing provides ample illumination of the interior, the brightest (red) interior surfaces are in stark contrast to the darkest areas. The result is glare. Occupants at the perimeter will tend to close the shades, thereby reducing available light throughout. 4

5 Energy Modeling An Overview System Control Interactions Plant Capacity Interactions Weather Load Model System Model Plant Model Economic Model Internal Loads Space Loads Hot / Ch.W. Demands Energy Input Costs: Annual & LCC OVERAL ENERGY MODELING STRATEGY 5

6 Analytical Tools Case Study with Revit/IES NO SKYLIGHT ATRIUM SKYLIGHT CURTAIN WALL PUNCHED OPENINGS The Case Study Model is intended to demonstrate a variety of exposure and configuration variations in a single example. Simplicity is preferred, in the interest of facilitating experimentation 6

7 wk 1 Design Optimization Techniques Analytical Tools Case Study with Revit/IES The Curtain Wall and windows are modeled using the basic Revit tools. CurtainWall Side The skylights and atrium roof are modeled as a sloped glazing roof type. Punch Side 7

8 Analytical Tools Case Study with Revit/IES The Heating/Cooling Load Calculation took about 15 seconds. It includes this Room Summary as well as detail for each of the rooms. This calculation and report took approximately 20 seconds to compute 8

9 Analytical Tools Case Study with Revit/IES Orientation of CW Cooling Loads Heating Loads ORIENTATION VARIATIONS North 457, ,774 By changing the orientation of the model in Revit and rerunning the energy analysis, it was easy to compare the effect of altering Curtain Wall exposure. South East 480, , % % 310, , % % This Technique allow one to optimize the orientation. West 583, % 310, % NNE - 10 deg 470, % 310, % NE - 45 deg 550, % 310, % NW - 45 dge 519, % 310, % NNW - 10 deg 455, % 310, % 9

10 Project Case Study 10

11 Project Case Study 11

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17 Project Case Study 17

18 9 : 00 AM No Sunshades SPRING & FALL SUMMER WINTER 18

19 Project Case Study 19

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21 Project Case Study ASHRAE 55 comfort chart (pg 7) Green ASHRAE comfort boundary Red conventional HVAC design boundary Tight Environmental Control No Control Clean Rooms Workplaces Transitory Spaces (hallways) Atria Outdoor Shelters Outdoors 21

22 Summer Evening Sun Summer Morning Sun Northwesterly Winter Winds Winter Wind Rose Southwesterly Summer Wind Winter Evening Sun Winter Morning Sun Noontime Sun Summer Wind Rose Washington D.C. monthly average precipitation 22

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24 100 Project Case Study 50 Temperature F Time of Day (July 25) 0 24

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