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CI-2009 EAp2:Minimum Energy Performance

Doubt about the Budget System type

Hello I'm simulating a store to the LEED CI cetification and using the section 11 to create the Budget Building Design. But I didn't understand the following paragraph of the note B of table 11.3.2A that says: "Supply air temperature shall be reset based on zone demand from the design temperature difference to a 10°F temperature difference under minimum load conditions. Design airflow rates shall be sized for the reset supply air temperature, i.e., a 10°F temperature difference". Someone can help me how to interpret this note, please. thanks for the attention

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Thu, 12/27/2012 - 19:39

It requires a supply air temperature reset on VAV Reheat systems. At full load, your supply temperature difference in the baseline will be 20˚F (per para 11.3.2.g). At part load it must reset to 10˚F to minimize the need for reheat. Why are you using ECB instead of Appendix G?

Mon, 01/07/2013 - 11:35

Hi Christopher, As per EA.p2, one of the requirements to comply with this pre-requisite is to achieve the prescritive requirements (Section 5.5,6.5,7.5 and 9.5) or the performance requirements of Section 11. If we choose to meet the requirements of Section 11 we should not use appendix G, isn't it correct? Thanks.

Mon, 01/07/2013 - 19:16

Hello Christopher. Thank you for your reply, but we are still in doubt in this paragraph. I'll try to describe a numerical example to try to explain this doubt. I have a setpoint of interior temperature of 73.4 º F, and, in accordance with paragraph 11.3.2.g, supply temperature of the ECB should be based on a temperature difference of 20 ° F, i.e.; 53.4º F in our case. We would like to know where the temperature difference of 10 º F, that table 11.3.2A- note b refers, fits. Thanks again

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