Thermal Delight in Architecture
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- Job Booker
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1 THERMAL COMFORT OPR Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 1 Thermal Delight in Architecture This work began with the hypothesis that the thermal function of a building could be used as an effective element of design. Thermal qualities warm, cool, humid, airy, radiant, cozy are an important part of our experience of a space; they not only influence what we choose to do there but also how we feel about the space. Lisa Heschong Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 2 1
2 Comfort OPR in the Context of the Building Acquisition Process Design intent often, but not always, occupants will be thermally comfortable Design criteria defines what you mean by comfortable sets targets for design efforts Methods develop ideas about how comfort will be achieved (HVAC, passive cooling, hybrid heating, ) Design Validation* verify that the method(s) selected will actually work and meet the OPR for example, that you can passively cool an office in Phoenix in August Construction Validation* check to see that the contractor s work will meet the OPR Post Occupancy Evaluation** are the OPR actually met in the building under use? (if not fix and learn; if yes, file under positive lessons learned) * part of building commissioning; ** part of ongoing commissioning Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 3 Building Commissioning verify verify verify verify commissioning is a process for verifying design, construction, and operation Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 4 2
3 Reminder: Parameters that Affect Thermal Comfort Design must control: Air temperature Relative humidity Air speed Radiant conditions MRT or Solar intensity environmental factors Design must consider: Clothing Activity level Mental state personal factors Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 5 A Key Source for Thermal Comfort Criteria ASHRAE Standard 55 zone of 80% acceptable responses Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 6 3
4 ASHRAE Thermal Comfort Zones two somewhat overlapping zones are defined and shown in the chart; a zone for 1 clo ( winter ) and another for 0.5 clo ( summer ) attire; the zone boundaries define an 80% occupant acceptance of thermal conditions (representing the middle three points of the seven-point scale) Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 7 The Chart in ASHRAE Standard 55 is Explicit with respect to: Relative humidity (or humidity ratio) Air temperature * Radiant temperature * * via operative temperature = (air temp + MRT) / 2 Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 8 4
5 The Chart in ASHRAE Standard 55 is Explicit with respect to: Clothing (clo value) at least for the 2 given levels ( summer and winter ) a designer should probably ask how does the chart deal with other clo values? (how is the comfort chart used in the real world of diverse clothing options?) Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 9 The Chart in ASHRAE Standard 55 is Silent with regard to: Activity level (met value) but, the zones are plotted assuming a sedentary activity Air speed but, the zones are plotted assuming air speed to be low a designer should probably ask what about other activity levels and what about other air speeds? (how is the comfort chart used in the real, complicated world?) Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 10 5
6 Extensions to the Standard 55 Chart A designer will need to read through the text of the standard to obtain adjustments for: Air speed (other than nominal) Activity level (other than sedentary) Clothing (other than 0.5 and 1.0 clo) And also for limits on: Radiant asymmetry Changes in conditions over time Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 11 Spatial & Temporal Non-Uniformity The text of ASHRAE Standard 55 addresses thermal non-uniformity: Thermal asymmetry (e.g., hot ceiling/cold floor) Too much is considered not good (especially with respect to radiant conditions) Thermal change with time (e.g., temperature cycling) Too much, too quickly, is considered not good Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 12 6
7 The Electronic ASHRAE Standard 55 six inputs outputs a software implementation of comfort zones easy to use Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 13 The CBE Comfort Tool input output Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 14 7
8 Emerging Issue Adaptive Comfort Standard first provided this option for naturally ventilated spaces; the comfort zone moves with changing outdoor air temperature Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 15 Another Source for Thermal Comfort Criteria Olgyay from: Design with Climate Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 16 8
9 The Olgyay Chart is Explicit with respect to: Temperature Relative humidity Air speed MRT solar radiation and evaporative cooling effects Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 17 The Olgyay Chart is Silent with regard to: Activity level (met value) Clothing level (clo value) a designer should probably ask what about other activity and clothing levels? (how is this comfort chart used in practice?) Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 18 9
10 Olgyay Chart Extensions Read through the text of Design with Climate to find adjustments for: Various clothing levels Various activity levels useful help is given Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 19 ASHRAE vs. Olgyay Criteria Olgyay comes from an envelope control philosophy (passive systems) ASHRAE comes from an HVAC control philosophy (active systems) They are alternatives not equivalents Nevertheless, the two comfort zones are surprisingly similar Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 20 10
11 ASHRAE vs. Olgyay Criteria ASHRAE has intentionally not placed a lower limit on RH for thermal comfort Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 21 Other Tools The Bioclimatic Chart overheated period to get a handle on what s most important relative to climate control; what issues should be looked at first what to deal with first is not always intuitive, especially for unfamiliar climates comfortable period underheated period Olgyay: Design with Climate Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 22 11
12 Other Tools First Moves to get a handle on what climate control strategies may be most applicable under various climate conditions various heating strategies Milne & Givoni: Energy Conservation Through Building Design Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 23 Other Tools First Moves various cooling strategies Milne & Givoni: Energy Conservation Through Building Design Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 24 12
13 Other Tools Climate Consultant www2.aud.ucla.edu/energy-design-tools/ Indianapolis to get a handle on what climate control strategies may be most applicable under various climate conditions Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 25 Other Tools Climate Consultant Tallahassee Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 26 13
14 Other Tools Climate Consultant Kuwait Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 27 don t play games with building occupants design as if people actually matter Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 28 14
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