[Bldg-sim] ASHRAE 90.1 Appendix G3.1.2.2

[milda margarin]

hi , I already submitted this question but there were no responses so I'd like to try again: could somebody share some insight to the ASHRAE 90.1 Appendix G3.1.2.2 point regarding heating and cooling equipment sizing based on building energy simulations. It is stated that the equipment should be oversized by a factor of 1.25 for heating and 1.15 for cooling. Are these "safety factors" based on the uncertainty associated with building energy simulations or a requirement that makes sure that the system can respond quickly enough during startup? Why are there different factors applied for heating and cooling?thanks!Milda
 		 	   		  
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