1515 75TH ST SW SOFTWORLD SERVICE 2018-01-02 MF Import

December 5,1995 Mechanical Plans Examiner Everett, Washington Re: Sofiwodd Services Facility Dear Sir or Madam: In reference to the the 1994 Washington Slate Energy Code regarding economizer requirements McKinstry is requesting a waiver from this requirement based on section 1433, Item 1 b. The facility consists of several large equipment rooms (clean room: class 100,000) and so ne small office/support area. This equipment must be maintained at 72 F and 50% relative humidity for proper operation and equipment longevity. For this mason, McKinstry performed an energy usage analysis to determine the feasability of utilizing air-s!de economizers and the associated humidification regvirement versus utilizing refdgrration oily with minimum outside air. The attached calculation Indicates that the annual humidification load required for the conditioning of the necessary outside air exceeds the annual cooling load of the space utilizing refrigeration only. The calculation Is broken down into several columns: outside air temperature bins, mean coincident wit bulb temperatures, it hourly observations per bin, grains of moisture at the bin dry and wet tulb conditions, outside air per bin required for cooling, process cooling load (mbh), transmission cooling load (mbh), economizer cooling available (mbh),annual chiller energy required (mbh), and annual humidification energy required (mbh). With the EER of the refrigeration equipment taken as 10.7, the total kw-hr required annually for the system with economizer is 1,303,406 kw-hr versus 1020,144 kw-hr for the system without economizer. If you have any questions or wish to discuss [his proposal in further detail, please give me. a call at 762.3311, X-164. Sincerely, Ching Wong Senior Engineer cc: Doug Moore Michael Wright Dan Robinson