Engineered Systems - June 2008 - (Page 80)

Application Checklist Published as part of “Back2Basics” and “HVACR Designer Tips” for April through June 2008. The following system analysis and analytical scorecard can be used to assess the use of a packaged rooftop unit for a central heating and A/C unit for a one-story ofﬁce building space. The approach is based in part on the 2004 ASHRAE Handbook — Systems and Equipment, Chapter 1, “System Analysis And Selection” and the 2007 ASHRAE Handbook — Applications, Chapter 3,“Commercial and Public Buildings.” In addition, our scoring is based on our own design, construction, commissioning, and building management experience. Scoring may differ based on project location, current costs, and local engineering experience. The design intent of the RTU-1 central HVAC system is to maintain space comfort during both the heating season and the A/C season. Ventilation is provided based on minimum ventilation and barometric relief though an airside economizer outdoor air ventilation system. The analysis and selection of the optimum HVAC system for a speciﬁc project can be determined through energy and life-cycle system analysis software program studies. This assessment should be part of optimizing energy performance when pursuing LEED® project certiﬁcation, as well as other high-performance grant programs. This month’s “Back2Basics” focuses on the building/energy management portion of the system application, while “HVACR Designer Tips” focuses on project closeout. Application Notes • Zero to 10 score, with 10 being excellent, and 0 being poor or not applicable. • These application notes are based on 30,000 sq ft of commercial space, with gas heating and DX cooling. ✓ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [10] . [8] . [5] . [0] [10] . [2] . [5] One-Story Ofﬁce Building Space HVAC System SUSTAINABLE DESIGN SCORECARD (MAXIMUM SCORE = 130) • Fundamental prerequisite commissioning . • Fundamental refrigerant management . . . • Optimal energy performance. . . . . . . . • Renewable energy . . . . . . . . . . . . . • Enhanced commissioning . . . . . . . . . • Enhanced refrigerant management . . . . • Measurement and veriﬁcation . . . . . . . • BAS trending • Remote monitoring • Space, equipment, and energy monitoring • Local and regional material . . . . . . . . • Minimum IAQ performance . . . . . . . . • Emission control . . . . . . . . . . . . . . • Increase ventilation effectiveness . . . . . • Controllability of systems . . . . . . . . . • Thermal comfort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [4] [7] [7] [5] [5] [7] Total score: . . . . . . . . . . . . . . . . . . . . . . 75 SUSTAINABLE BUILDING MANAGEMENT SCORECARD (MAXIMUM SCORE = 60) • Assets barcoded . . . . . . . . . . . . . . . . . . . . . [10] • Approximate number of workorders annually . . . . . . . [8] • Serviceability outside occupied space . . . . . . . . . . . [9] • Serviceability during normal working hours . . . . . . . . [8] • Ease of replacement at end of useful service life . . . . [10] • Continuous trending, benchmarking, and course correction [5] Total score: . . . . . . . . . . . . . . . . . . . . . . 50 SYSTEM ANALYSIS AND SELECTION SCORECARD (MAXIMUM SCORE = 120) • Space temperature control. . . • Space humidity control. . . . . • IAQ . . . . . . . . . . . . . . . • Ventilation control . . . . . . . • Equipment airborne noise . . . • Equipment radiant noise . . . . • Useful service life of equipment • Equipment room requirement . • System constraints. . . . . . . • First cost . . . . . . . . . . . . • Operating cost . . . . . . . . . • Maintenance cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [7] [0] [7] [7] [7] [7] [7] [0] [5] [8] [6] [7] Total HVAC system application score is 193 points out of a possible 310 points, for a rating of 62%. 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. Total score: . . . . . . . . . . . . . . . . . . . . . . 68 80 En gi neer ed S y stem s June 2008

Table of Contents Feed for the Digital Edition of Engineered Systems - June 2008

Engineered Systems - June 2008 Contents Editor’s Note Letters To The Editor Back2Basics HVAC Challenge Case In Point Commissioning Efficiency Incentives HydroTech Building Automation Energy Wiz HVACR Designer Tips Notre Dame Tackles the Heat State Of The Arts Time For A Transplant? Project Delivery: What Can IPD Do For You? Issues & Events Computers & Software Products Application Checklist Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - June 2008

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