coMPleTed ProjecTs Tech Talk PuGeT sound enerGy TenanT iMProVeMenT what is the optimum supply air temperature for the hVac cooling • 100,000 ft2 Tenant Improvement of floors 8-12 in the systems we design and install in our commercial, retail and institutional buildings? PSE building • Bellevue, WA HVAC Systems: So what is the answer, what is the optimum PART TWO: The air displacement design concept re- • Medium temperature variable air volume (VAV) systems utilizing Continued from Summer/Fall 2006 Issue quires a supply air temperature between 60º supply air temperature? two rooftop units and 65º F to meet the optimum supply air • Series Type VAV terminal boxes with silent mercury contactors The answer depends on the application. For Are there systems that use other than the temperature. This allows for superior envi- all but air displacement systems or other • Terminal boxes use electric heat at all perimeters proposed lower supply air temperatures? ronmental comfort for the occupants. special design considerations, it seems the • Communicating electronic direct digital control system Yes, contrary to the lower supply air tem- science and engineering shows we should be • Raised curb sound attenuating system at rooftop units perature design is the system concept that Why use a supply air temperature differ- considering using 45º to 50º F supply air deals with the emerging design technology ent from the historic 55º F and the lower system not the traditional 55º F. • Water cooled Liebert Units were used to cool IT room supply air system? What are the reasons of the air displacement system (also known as the under floor system). and advantages? There are some other obvious engineering Some possible advantages for using a higher issues that need addressing such as: The design parameters for the Under Floor cooling Supply Air Temperature (SAT): • What equipment can produce the lower Air Delivery system (UFAD) are diametri- souTh 405 Place cally opposed to the logic for systems using • Lower compressor energy costs due to supply air temperatures? Most packaged discharge air temperatures below 55ºF. The higher SAT with more economizer hours equipment is not capable of producing • 53,553 ft2 3-story building. air displacement system relies on provid- for cooling equaling lower energy cost. lower than 55º F ( or even higher). • 17,274 ft2 “open” parking garage ing cooling from below with warmer air as • With a UFAD system larger main ducts • Do we supply the lower temperature • Renton, WA opposed to a more conventional system that are required for the larger CFM quantity directly to the occupied space or mix the HVAC Systems: provides air from overhead. but there is the opportunity to reduce or cooler air via series fan powered terminals? eliminate branch and distribution ducts • Do we use blow-through or draw-through • Medium temperature variable air volume (VAV) system The UFAD system treats the conditioned since the air distribution is via the under fan designs? utilizing one (1) Mammoth 78 series Ultraline rooftop unit space (or zone) for 6+ feet above the finished floor plenums. This may result in lower • Series type VAV boxes with silent mercury contactors floor. The reasoning for the higher supply first costs. temperature is the need to maintain the The final answer is: • Communicating electronic DDC system with modem remote • Opportunity for lower floor-to-floor heights. occupied space comfort when supply is from As engineering and design practitioners, we access • Improve indoor air quality by supplying below. This will allow for thermal comfort need to do a proper job of determining the Energy Saving Strategies: as well as reduced sensation of drafts. What air directly to the occupied zone and not client’s needs, evaluating the design options • Variable speed (inverter) driven supply and relief fans for is the optimum supply air temperature for treating or providing comfort to “unoc- and making a solid recommendation based Mammoth Ultraline unit result in both energy savings and very this system concept? cupied” space. on engineering and science – not conven- accurate control of duct building static pressure Obviously a lower supply air temperature tion, convenience or tradition. • Direct digital controls provide accurate temperature control, design would accomplish the advantages minimizing drift and overshoot: Heating signals are ‘pulsed’ to (noted in our last newsletter) for the lower exactly match the load supply air system. However, the environ- mental comfort would be unacceptable. eMuleX did you know • 43,917 ft2 2-story facility • 2 story tenant improvement • Bothell, WA naioP community enhancement Project PSF contributes to Giddens School Project HVAC Systems: • (2) Trane 27.5 ton units with variable frequency drive serving an engineering work area From: Leah Lee Giddens • (3) 10 ton Liebert units serving a DVT server room and data Sent: Friday, October 27, 2006 8:30 AM center Subject: RE: Donation School • (2) Rooftop exhaust fans for equipment room and soldering Hi Marsha, exhaust We are eternally grateful for PSF Mechanical’s donation. • Communication electronic direct digital control system Thanks again! Leah Lee Director of Development Giddens School 620 - 20th Avenue South Seattle, WA 98144 www.giddensschool.org PSF Mechanical, Inc. 9322 14th Avenue South, Seattle, WA 98108 Phone: 206.764.9663 Fax: 206.762.8381 www.psfmech.com Psf PeoPle Winter ‘06 / Spring ‘07 Volume 18 Meet the People That Make Things happen Scott Wallace, Senior Project Man- Traci Staffen, Office Manager, has been ager, has over 32 years of HVAC project in the industry for two years. Her energetic manangement, field coordination and enthusiasm keeps our various departments system design experience. He also has organized and flowing. She maintains Published by PSF experience coordinating HVAC, plumbing, our “PSF-U” schedule so our entire team piping and fire protection. Scott brings reli- continues to learn about new products and ability, excellent communication skills and applications within the industry. a willing, collabrative attitude to all of his projects. Ray Burdine, Purchasing Manager, has Craig Randall, Design Engineer, has been working in the HVAC industry for over 20 worked in the industry for over 18 years and has been with PSF since 2005. Ray ensures a new era for Psf uPcoMinG ProjecTs years. With several years of designing, draft- our projects get the equipment and materi- Yes, it’s true! We’re growing … adding staff Nordstrom Projects ing and estimating experience, Craig brings als delivered on time! He enjoys playing golf …adding new office space … expanding a comprehensive approach to Design/Build in his spare time as well as traveling around • Ross Park our capabilities … we have even rolled out a engineering. the country in his RV. Pittsburgh, PA (opens Fall 08) new logo. But, one thing will never change – our way of doing business. Keeping our • Thousand Oaks word will always be the most important Thousand Oaks, CA (opens Fall 08) thing we do. We will always strive to be • Cedar Rapids Mark Gifford, Inside Fabrication Sales, “Trusted to be the Better Choice”! Cedar Rapids, IA (opens Winter 07) has been working in the customer service • Southcenter Rack industry as a manager and salesman for over You may have already seen our fresh new 30 years have completed successful projects Tukwila, WA (opens Fall 07) 15 years and brings his energetic personality look cruising through the city on our com- nationwide and in the Pacific Northwest. and experience to his position at PSF. pany vehicles, colorful banners posted at our We also offer Design/Assist and Value En- job sites, brightly lit signage on our corpo- gineering when needed as well as Plan and Local Projects MailbaG rate offices and a newly designed website to Spec work. • St. Thomas School keep you up-to-date on our projects (past, • McMurray Cardiac Rehab Like to get on our mailing list? present and future). PSF is a full-service mechanical contract- • Microsoft Global Security Center ing company offering design, fabrication, Send your name and address or Our entire team is excited about beginning installation and commissioning of HVAC • Bellevue First Presbyterian Church Tim Carter, Assistant Project Manager, email address to: another era in PSF’s long history and we are systems. Our service department is on-call Education Wing has over 7 years experience in the HVAC email@example.com equally excited about being able to provide 24/7 to ensure your building systems are • Boeing, Building 9-101 industry. He has helped manage various our customers with the things we do best. operating efficiently. • Highline Medical Center projects, including high rise office buildings, Or, simply write to: We do what we say! • NW Hospital Medical Center tenant improvements and medical/office PSF Mechanical, Inc. Custom sheet metal fabrication is welcomed 9322 14th Avenue South Pharmacy remodel buildings. We have long been known for our Design/ by our skilled artisans – you dream it, we Seattle, WA 98108 Build HVAC capabilities and for the past can build it. For more information or key contacts list, visit our web site at: Our dedicated teams, from the office www.psfmech.com to the field, are always “at the ready” inside This issue and geared to make each project a suc- cess. It’s what we do! Completed Projects ............................2 Tech Talk .............................................3 Did You Know ....................................3 PSF People ..........................................4 9322 14th Avenue South Seattle, WA 98108-5102 May we introduce you a refrigeration compressor that ... to the Technology • Contains no bearings • Has its own brain of Turbocor? • Never needs oil • Stays quiet Ask us about a compressor technology • Has no locked rotor amp rating so advanced it’s starting to create a • Is environmentally friendly revolution! Save 50% on energy costs!
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