U N I V E R S I T Y O F V I R G I N I A A R T M U S E U M C h a - PowerPoint PPT Presentation

U N I V E R S I T Y O F V I R G I N I A A R T M U S E U M C h a r l o t t e s v i l l e , VA L a u r e n B e g e n

N S AT E L L I T E P H OTO 1 5 5 R u g b y R o a d

N S I T E P L A N 1 5 5 R u g b y R o a d

Predicted: Azimuth: 220 Altitude: 32 S U N PAT H P r e d i c t e d

27 235 S U N PAT H A c t u a l

9.7.2010 2PM 9.8.2010 6:30PM EXTERIOR LOOKING IN INTERIOR LOOKING OUT 3 - D M O D E L + S U N PAT H S I M U L AT I O N F i x e d V i e w

SOLSTICE EQUINOX December 21st March 21st EQUINOX SOLSTICE September 21st June 21 3 - D M O D E L + S U N PAT H S I M U L AT I O N A n i m a t i o n s

R-VALUES Section Cut at Window Exterior Air .17 Glass .91 Interior Air .68 TOTAL 1.76 Section Cut at Brick Wall Exterior Air .17 Brick - 12 inches 2.4 Plaster .15 Wood Sheathing -3/8” .47 Interior Air .68 TOTAL 3.87 ANALYSIS: Based on limited access to interior temperatures, the design R-values do seem accurate. At 2pm on 9.7.2010, the exterior temperature was 88F and the interior temperature was 80F. Although cooler than the exterior temperature, the interior temperature is warmer than one would expect of a conditioned building. The low R-value of the section cut at the window and door indicates that there is little to prevent heat from moving through this wall. Because the glass window and door nearly span the length of the entry vestibule, the higher R-value of the brick does not help signifjcantly to keep this space cool. T H E R M A L R E S I S TA N C E

EXTERIOR ANALYSIS: 71 Thermal imaging reveals the same ineffjciency of the glass windows and 86 door found in the design R-value. Constructed in 1933, the door and 82 windows appear to be original. To improve thermal resistance, the EXTERIOR EXTERIOR single-pane glass door and window 71 71 could be replaced with a more effjcient double-pane glass. Less invasive measures, such as hanging 82 82 curtains along the windows, would also help. Another measure would be to increase the conditioning of 90 90 the interior vestibule to create an air barrier between exterior and interior. During the summer months, a constant fmow of cold air INTERIOR blowing down behind the entrance 73 would keep warm air from moving in. In the winter months, a constant fmow of warm air in this same position would keep the warm air 78 from escaping to the exterior. 75 T H E R M A L I M A G I N G O c t o b e r 1 2 t h 2 0 1 0 3 p m

VEGETATION + SUN Vegetion plays a critical role in shielding the building entrance from WIND mid-day sun. A recent removal of several large North and NW winds trees removes this shield, are blocked by the exposing the building to orientation of the building. increased sun. In both Without air circulation cases, the sun creates during hot weather, the a warm micro-climate, space can become but in the latter the unpleasant. It can also micro-climate will most provide comfort during certainly reach the evening by increasing uncomfortable levels. the retention of heat in the bricks and creating a warm micro-climate. M I C R O - C L I M AT E D I A G R A M S

Vegetion plays a critical role in shielding the building entrance from mid-day sun. A recent removal of several large trees removes this shield, exposing the building to increased sun. In both cases, the sun creates a warm micro-climate, RETAINED HEAT + TIME OF DAY but in the latter the micro-climate will most Heat retained by the material of the building during the day (brick and stone being primary heat retainers) is released certainly reach slowly after the sun sets. On a warm day, the retention of heat causes a hot and uncomfortable micro-climate, but in uncomfortable levels. the cooler evening hours it creates a warm, comfortable micro-climate. M I C R O - C L I M AT E D I A G R A M S

i e e e 9.7.2010 9.8.2010 9.7.2010 2PM 6:30PM 10PM ANALYSIS: The interior temperature at the only time measured, 2PM, was within the range of comfor t. However, in the event of a more extreme high exterior temperature, this would not likely be the case. The exterior temperature at 2PM was not within the comfor t zone due to the building being in direct sunlight. This condition will be exacerbated by the recent removal of several large shading trees in front of the Ar t Museum. Re-planting will be critical to avoiding extremely uncomfor table conditions in this space. At present, the exterior space only becomes more comfor table later in the evening. By 10pm, it falls within the comfor t zone. The sun no longer produces excess heat, but the brick has retained some of that daytime heat maintaining a comfor table degree of heat in the cooler night-time temperatures. P S Y C H R O M E T R I C C H A R T S