Engineered Systems - April 2008 - (Page 22)

CaseInPoint “StopWaste org received “StopWaste.org received a total total project score project score of 54, and all 54 and all 10 credits for optimizing energy credits for optimizing ener redi ptimizin ergy performance. Software energy performance. Software energy modeling sh modeling shows that the building hows th hat the building ildi out outperforms Title 24-2005, tperf forms itle 24 2005 l 5, Californi California’s stringent energy lif ia’ st ge t g code by 47%.” de, 47% ” Therma-Fuser diffusers were selected in order to gain energy savings, and to meet budget concerns. Rumsey Engineers’ detailed energy models calculated that these systems use less energy than a standard VAV box-based system. UNDER CONTROL Controls were kept as simple as possible to minimize project costs and to protect against efﬁciency decay — the inevitable misadjustments, overrides, and sensor drift — that increases the energy use of more complex control systems over time. The use of Therma-Fusers, combined with the elimination of reheat, through the use of high-efﬁciency windows, met the client’s demands for tight, zoned control and resulted in signiﬁcant budget savings. Because of the high-efﬁciency goals, these savings were invested in high-efﬁciency package units with variable-speed fans and modulating gas valves in the heating sections. Natural ventilation from open windows is used in the building whenever possible to save heating and cooling energy. Outdoor conditions are continually monitored with green or red LEDs, notifying occupants when the mechanical cooling is off and the outdoor conditions are optimum for opening windows. Allowing occupants to control the windows reduces the amount of controls hardware required and provides another degree of individual control. At night, based on the time and outdoor air temperature, the system operates at a reduced air volume to precool the building mass, providing a signiﬁcant ﬂywheel effect in the mild California climate. This night purge operation is controlled in a manner similar to an economizer cycle, which is also enabled after hours. A comparison of indoor and outdoor temperatures detects the times in summer when night purge is not optimal. Four sensors monitor CO2 levels; this indirectly detects the number of people in the building and increases or reduces the amount of outside air. The CO2 sensors do not alter the amount of air delivered, but rather the percentage of outdoor air included in the delivered air. Therma-Fuser diffusers control airﬂow volume via fan pressure control, while the CO2 sensors actuate outside air dampers. While commissioning is a prerequisite of a LEED certiﬁed building, the owner elected to have enhanced commissioning performed, gaining another LEED point. How do I make my building green? We all want to make our existing buildings a greener place. Commissioning a building with our precise tools allow you to assess and improve building HVAC efficiency and minimize environmental impact. That means less wasted energy and more green in your pocket. By going green, you can make a difference. TSI: making the world greener— one building at a time. We offer the 9555 VelociCalc Multi-Function Ventilation Meter ® tools to help you meet your green goals. To learn more, visit www.tsi.com/GREEN. Tel: 800 874 2811 E-mail: info@tsi.com FREE INFO: 116 22 En gi neer ed S y stem s April 2008 http://www.tsi.com/GREEN http://www.tsi.com/GREEN

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

Engineered Systems - April 2008 Contents Editor’s Note Back2Basics HVAC Challenge Case In Point Commissioning Building Automation Energy Wiz HVACR Designer Tips This Time, Water Cooled Was All Wet Cleanroom Design In 10 Easy Steps It's Not The Heat, It's The Humidity Issues & Events Computers and Software Products Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - April 2008

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