Engineered Systems - March 2008 - (Page 34)

Application Checklist Strip Mall / Retail Space Split System Published as part of “Back2Basics” and “HVACR Designer Tips” for January through March 2008. The following system analysis and analytical scorecard can be used to assess the type of HVAC system for a retail space strip mall application based on good engineering practice and other state and local requirements. The project approach is based in part on: • 2008 ASHRAE Handbook —Systems and Equipment, Chapter 1, “HVAC System Analysis and Selection,” and Chapter 9, “Design of Small Forced Air Heating & Cooling Systems” • 2007 ASHRAE Handbook — Applications, Chapter 2, “Retail Facilities” In addition, our scoring is based on our own design, construction, commissioning, and building management experience as it pertains to small retail space. Approximately 70% of HVAC systems are decentralized, and for this application, the HVAC system is a standard decentralized system installation. Scoring may differ based on project location, current costs, and local engineering experience. The analysis and selection of the optimum HVAC system for this application is ideally suited based on simplicity of the retail space HVAC system and ﬁrst cost. Other beneﬁts and features of an HVAC system such as life cycle, sustainability, etc., are frequently of less importance for many retail owners. This assessment can be part of optimizing energy performance when pursuing LEED® project certiﬁcation, as well as other highperformance grant programs, but probably not a priority for a small business owner due to ﬁnancial considerations. Application Notes • Zero to 10, with 10 being excellent, and 0 being poor or not applicable. • Small retail, mini-malls, and strip malls will probably contract out the annual maintenance services. • There are very few highly energy-efﬁcient HVAC systems for a project installation of this size. ✓ • Air motion [8] • System constraints [3] • First cost [8] Total score: 83 SUSTAINABLE DESIGN SCORECARD (MAXIMUM SCORE = 70) • Fundamental and additional building system commissioning . [10] • Optimized energy performance [3] • Renewable energy (cogeneration unit) [0] • On-site • Additional commissioning [10] • System manual • Measurement and veriﬁcation [7] • BAS trending • Remote monitoring • Electrical power quality and energy monitoring • Easy-to-understand training [8] • Local and regional material [2] Total score: 40 SUSTAINABLE BUILDING MANAGEMENT SCORECARD (MAXIMUM SCORE = 90) • Assets bar-coded [10] • Approximate number of workorders estimated annually [8] • Serviceability outside space [8] • Serviceability during normal working hours [10] • Ease of replacement at end of useful service life [8] • Qualiﬁcation of in-house maintenance staff [5] • Adaptation to peak electrical load shaving [0] • Operating cost [7] • Maintenance cost [8] Total score: 64 SYSTEM ANALYSIS AND SELECTION SCORECARD (MAXIMUM SCORE = 150) • Temperature control [7] • Humidity control [4] • Air ﬁltration [5] • Multiple space temperature control capability [5] • Utility company incentive [5] • Equipment redundancy [0] • Useful service life of equipment [8] • Radiant noise and/or vibration [6] • Ambient noise [7] • Capacity control [5] • Ventilation system [5] • Metering [7] Total HVAC system application score is 187 points out of a possible 310 points, for a rating of 60%. McKew is an HVAC commissioning engineer in the Building Solutions Group at RDK Engineers. If you have any comments, suggestions, or questions regarding this designer checklist, contact Amanda McKew at amckew@rdkengineers.com. 34 En gi neer ed S y stem s March 2008

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Engineered Systems - March 2008 Contents Editor’s Note Back2Basics HVAC Challenge Case In Point Commissioning Building Automation Energy Wiz HVACR Designer Tips Application Checklist Exemplary Design = Elementary Success The Modern Unit Ventilator On A Mission VAV Systems And Green Design – Part II Issues & Events Products Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - March 2008

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