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2-5City of Arden Hills Energy and Sustainability <br />27 <br />.8 <br />° <br />71 <br />.0 <br />° <br />R 14 <br />. <br />0 <br />26 <br />.2 <br />° <br />72 <br />.0 <br />° <br />R 14 <br />. <br />8 <br />26 <br />.9 <br />° <br />73 <br />.6 <br />° <br />R 15 <br />. <br />1 <br />24.6°70.6° <br />R16.3 <br />28.2°70.4° <br />R12.6 <br />29 <br />.8 <br />° <br />69 <br />.6 <br />° <br />R 11 <br />. <br />5 <br />29 <br />.8 <br />° <br />68 <br />.2 <br />° <br />R9 <br />.4 <br />30 <br />.0° <br />70 <br />.4° <br />R12. <br />6 <br />28 <br />.0° <br />69 <br />.2° <br />R13. <br />4 <br />29 <br />.2 <br />° <br />69 <br />.4 <br />° <br />R 13 <br />. <br />1 <br />32 <br />.0° <br />69 <br />.2° <br />R11. <br />7 <br />Preliminary Exterior Envelope Effective R-Value Overview <br />An preliminary review of the existing exterior envelop <br />performance was conducted on November 15th, 2017. The <br />review included taking interior and exterior air temperature <br />and CO2 readings as well as infrared surface temperature <br />readings at building interior and exterior at select locations. <br />From these readings, an effective R value of each wall surface <br />can be estimated. Estimated effective R values and actual <br />performance may vary due to variations in infrared <br />temperature readings as well as wall surface temperature <br />variations due to HVAC supply air patterns. <br />The intent of this envelope performance estimation is to <br />provide an order of magnitude overview of the general thermal <br />performance of the exterior envelope. For a more accurate <br />determination of the existing building envelope’s performance, <br />a detailed assessment should be executed. <br />November 15, 2017 Measurements <br />Exterior Air Temperature: 31.6° <br />Exterior Humidity: 63.2% <br />Exterior CO2: 1234 ppm <br />Interior Air Temperature: 72.6° (average) <br />Interior Humidity: 23.5% <br />Interior CO2: 1507 ppm <br />Average Exterior Surface Temp: 28.4° <br />Average Interior Surface Temp: 70.3° <br />Average Effective R Value: 13.15 (estimated) <br />Energy Use