1135 CRAFTSMAN WAY 2018-01-02 MF Import

Page 1 of 1 Meg Haley From: Duane Lewellen [dlewellen@ricegroup.com] � C � U � ' � � � Sent: Friday, Aprii 20, 2007 4:05 PM To: Meg Haley Cc: Raiph Baum Subject: Port Gardner Boat Wash Attachments: boat wash equip cut sheets for plan review.pdf Meg, 1. Attached are the cut sheets per your request. 2. Regarding the economizer requirement this is a unique system that doesn't fit neatly within the current energy code standards. We essentially have 12 independent indoor air handlers connected lo a singie heat pump unit located outdoors. The heat pump is high efficiency and is able to provide simultaneous heating and cooling by recovering rejected heat from the units in the cooling mode. There are two ways to look at the system depending on whelher you consider this a simple or complex system. SIMPLE SYSTEM One way to look at the system is essentially the same as 12 independent split system heat pumps ranging in size from 6,000 BTUH to 30,000 BTUH cooling capacity. This would be considered a simple system per WSEC Section 1421. The indoor airhandling units are located on the walls, in the t-bar ceiling, and above the ceiling. Per Section 1423a economizers are required for cooling units >20,000 BTUH instailed outdoors or in a mechanical room adjacent to outdoors. The"installed outdoors" refers to package units (not split systems). None of the cooling units are located in a mechanical room adjacent to outdoors so this requirement does not apply. Per Section 1423b economizers are required for all cooling regardless of location greater than 54,000 BTUH. Our largest unit is raled at 30,000 BTUH (AC10)and therefore no economizer is required. COMPLEX SYSTEM Another way to look at the sy�tem is as a single 8-ton (96,000 BTUH capacity) split system heat pump with multiple zoned air handlers. With this approach the system would be considered a complex system because the size exceeds the maximum of 84,000 BTUH established for simple systems (Section 1421 b). Per 1433 compiex systems must have economisers unless the system meets one of the exceptions. The system proposed meets exception#1. The proposed cooling energy eKciency ratio (EER) is 11.1. The required minimum EER per Tabie 14-1 B is 10.1. The proposed equipment exceeds the code requirement by 10% and therefore complies with exceplion#1. 3.As I mentioned on the phone we are meeting the requirements of the Washington State Ventilation 8 Indoor Air Quality Code using two (2)air-to-air heat exchangers one for each Floor(HRU-1 and HRU-2) Please don't hesitate to call or email me if you have any further questions. Duane J. Lewellen RICE Group, Inc 425-774-3829 425-672-2084 tax dlawellen@ricegroup.com ;I i`; OF EVERETT ;E':�IF'�NCI:� '�ON PERMIT .�i�.;!�on7