High Performing Buildings - Fall 2009 - (Page 33)

Warren County Public Schools’ energy savings total more than $4 million since 2003. The savings started with changes in existing schools, such as turning out lights in unoccupied rooms. The district identified more opportunities to improve school energy efficiency during renovation and construction projects. reduce the system pressure drop. Cmta generally specified schedule 40 black steel with mechanical joints for loop piping materials in the past. plano used uninsulated schedule 80 pvC piping for all interior piping to keep construction costs from rising. Warren County public Schools has used schedule 80 pvC for many years and has had no problems with leaks. Outdoor air is introduced to the school through the use of central equipment. three dedicated outdoor air-handling units provide fresh air to the building and provide an exhaust air path for building pressurization control. this allows the use of a desiccant heat recovery wheel in each outdoor air unit. a supplemental two-pipe coil is located in the outdoor air path downstream of the heat recovery wheel. the original purpose of this coil was to provide additional heat to the airstream in the winter months and supplemental dehumidification during the summer months. Centrally located geothermal heat pump chillers provide a source of heating hot water in the winter and chilled water in the summer. the geothermal heat pump chillers now operate in the winter months only. WCpS tested operation of the system during the hot and humid summer months and found that building humidity is controlled without supplemental cooling of the outdoor air. this is attributed to the classroom heat pump’s excellent dehumidification capabilities in the first stage cooling, the desiccant heat recovery wheel in the outdoor air unit and a tight building thermal envelope. domestic Water heating the building’s domestic water heating system is unusual. the entire building’s 110°F domestic water is heated by one geothermal unit serving the gym. the gym’s airconditioning system consists of two 15 ton heat pump units. Because cooling requirements for the gymnasium are much greater than the heating requirements, one of the units is equipped with a double wall type domestic water/refrigerant heat exchanger as required by code. the building’s domestic hot water is stored in two tanks with no back-up heat source. When the gym heat pump is in the cooling mode, the heat is rejected to the domestic water in lieu of the well field. all domestic water is heated Performing Buildings 33 W a r r e n c o u n t y e n e r g y s ta r s c h o o l s e u i kBtu/ft2 · yr 10 Plano elementary 2007 Alvaton elementary 2005 Henry moss middle 2002 drakes Creek middle 2002 Warren east middle 2002 Climate Zone 4* 20 30 26 35 42 43 43 73 40 50 60 70 80 *Advanced Energy Design Guide for K – 12 Schools note: Years denote new construction or renovation. energy use intensity was measured in the year that each school received the energY sTAr label. fa l l 2 0 0 9 HigH Photo © CmTA Consulting engineers

Table of Contents for the Digital Edition of High Performing Buildings - Fall 2009

High Performing Buildings - Fall 2009
Contents
Commentary
Kitsap County Administration Building
McDonald's Corporation
Plano Elementary School
California Department of Education
Burns & McDonnell
Advertisers Index

High Performing Buildings - Fall 2009