Hello, How are the Thermostat values (Upper and Lower limit) to be selected for LEED CS please? We are currently working on a project for which the climate (Sao Paolo) indicates that the use of natural ventilation may offset the cooling load considerably when the thermostat lower and upper limit values were set to 18°C and 26°C respectively. When we applied the ASHRAE Internal Conditions presented in EDSL TAS (the dynamic thermal simulation software) the office space is set to have 21.1°C and 22.8°C as the thermostat lower and upper limit values during occupancy hours. TAS explains that this band is set according to 2005 California Standards. This would reduce the effectiveness of a mixed-mode (mechanical + natural ventilation) scenario considerably. Are these thermostat values mandatory for any climate? Does ASHRAE recommend what thermostat values to use? Is it possible to use the 18°C and 26°C as limits? Your help would be very much appreciated. Thank you in advance for your assistance.

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

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Thu, 02/07/2013 - 13:57

90.1 only requires that the temperature setting be identical in both models. To claim savings related to natural ventilation see the example in the appendix to the Advanced Energy Modeling Guide for LEED.

Herman C

LEEDuser Basic Member

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Thu, 02/07/2013 - 17:40

Hi Marcus, Thank you for your reply. That explains why no reference is found in 90.1 regarding thermostat values. Will follow a similar procedure to the one described in Appendix D1 of the Advanced Energy Modeling for LEED. Thank very much for your assistance.

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