The unit’s performance at 95° F accounts for 20% of the total SACC. Its performance at 83° F counts for 80% of the total SACC. The equation to calculate SACC looks like thisĪCC 95 = Capacity SD − Q duct_SD − Q infiltration_95ĪCC 83 = Capacity SD − Q duct_SD − Q infiltration_83įirst, note how SACC takes into account each AC unit’s performance at two different outdoor temperatures – 83° F and 95° F. This new standard is called Seasonally Adjusted Cooling Capacity – SACC. The end result is so egregious that the Department of Energy now requires portable AC manufacturers to test all new units released to market by a new standard for measuring BTUs. Units that would have a total cooling capacity of 10,000 BTUs have a total capacity as low as 5,500 BTUs when accounting for these inefficiencies. The end result is that total BTUs are drastically reduced. This causes higher pressure hot outdoor air – "infiltration air" - to get sucked into the room A portable AC unit exhausts warm air from the room being cooled which creates an area of low pressure inside the room.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |