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Transcript
Energy Goals 1. Maximize use of daylight to reduce energy consumption 2. Optimize the building envelope to reduce energy consumption of heating, cooling and mechanical ventilation. 3. Use energy metering to minimize unintended energy use for lighting and temperature control 4. incorporate energy efficient electrical and mechanical systems to reduce energy use 1. Lighting & Daylighting Daylighting Will the building be located and oriented to maximize opportunities for daylighting? Yes No Yes No Yes No Yes No Yes No Yes No Will the window sizing and placement optimize energy-savings and maximize daylighting? Are design strategies being implemented to maximize daylight for upper floors? N/A Are design strategies being implemented to bring light deeper into occupied spaces and provide uniform lighting? Will window glazing be selected to optimize energy-savings and daylighting (i.e. high visible transmittance (VT))? Are shading devices being integrated to minimize overheating and glare? No controls Daylighting (continuous dimming) Daylighting (multiple step dimming) Daylighting (on/off) Are lighting controls being integrated? Occupancy sensor Occupancy and daylighting (continuous dimming) Occupancy and daylighting (multiple step dimming) Occupancy and daylighting (on/off) Maximize daylighting by special configuration: New GSB buildings are oriented in the way that the larger façade area faces South. Daylighting opportunities are maximized on a daily basis. About 45% of the façade area will be windows, and portion of it will be glazed glass walls. Internal light shelves will passively aid the penetration of daylight deeper into the occupied spaces. Glazing The window glazing will be high performance thermally broken double pane insulated units that are spectrally selective and contain a low-emissivity layer. Areas of glazing will have an integrated photovoltaic frit glass. Total glazing will be optimized to assure the best ratio of light transmission to heat transmission. 45% of the exterior vertical cladding of the building will be glazed with this material. Lighting Control further reduce lighting load through the use of a “continuous/off” dimming system.The building installed energy density in Watts/sq. ft. due to lighting will be reduced through optimized installed power density and foot candle requirements. Daylight dimming systems will further reduce lighting load through the use of a “continuous/off” dimming system. 2. Building Envelope Optimization of building envelope Will building form and thermal massing be used to minimize heat loss through the building envelope? Yes No In cold climates, will glazing with a low U-factor be used? Yes No Yes No penetrating into the building? Yes No Will there be a continuous air barrier? Yes No Will materials be used to meet or exceed the ASHRAE 90.1-2004 or State Energy Building Codes standards with respect to thermal resistance and maintaining interior comfort? Are measures being considered to prevent groundwater or driven rain from Thermal Mass Thermal mass comes from the concrete materials used for walls, ceilings and floor slabs. Being exposed in vertical and horizontal configurations, they are used as a passive cooling device to allow radiant cooling. The building will be night flushed using cool night air to pre-cool the thermal mass; during the day, the thermal mass effectively absorbs heat to relieve load on the building’s cooling mechanical systems. Water-proofing & Air Barriers The new GSB building is engineered to be sealed from moisture intrusion. The stone masonry walls will incorporate a cavity between the stone veneer and the metal stud and sheathing assembly substrate to weep from the wall any moisture that penetrates the outer masonry wythe. Concealed masonry flashings will be flexible metal flashing in combination with a self-adhering membrane. Vertical waterproofing will be provided at basement foundation walls. Water proofing to the Faculty Office Building quadrangle over garage will be modified bitumen asphaltic membrane. Wall insulation will be accomplished using a continuous layer of rigid foam board – extruded polystyrene (XPS) insulation applied to the exterior sheathing. The insulation will be designed to provide twice code baseline performance. Roof insulation shall utilize continuous board insulation (Polyisocyanurate material), twice code minimum. Clay tile roofing will be applied to fire retardant plywood substrate. A roof membrane will be provided. Complete envelope air infiltration sealing will be required including certified blower door test. Materials for Interior Comfort / Exceeding Code Standards Roof and wall systems will transmit 50% less heat than in a code compliant building via a doubling of the code required insulating capacity. The roof membrane will be a light colored (light grey or white) to achieve high albedo (0.3 reflectance) and be highly reflective. Thermoplastic polyolefin sealants will be selected on the basis of performance, substrate material, and economy, and are expected to include both silicon and urethane based materials. The external building shades will passively control solar insolation falling on the building facades. Metering Energy metering Will there be interval metering or sub-metering of major energy uses? Yes No N/A Additional sub-metering will be provided for lighting, receptacle power and mechanical equipment power loads so that the owner can monitor the energy use of the building for ongoing information and optimization and per LEEDTM recommendation. Energy Efficient Systems Energy-efficient systems Will the following lighting features be integrated? high efficiency lamps Yes No luminaires with electronic ballasts Yes No task lighting where suitable Yes No appropriate personal lighting controls Yes No N/A Select one Standard gas boilers Will high efficiency (modulating or condensing) boilers be integrated Modulating boilers into the building? Condensing boilers N/A Will high efficiency chillers be integrated into the building? Yes No N/A Will co-generation be integrated at the district or the building scale? Yes No N/A Will heat pumps be integrated? Yes No N/A variable speed drives on variable air volume distribution systems Yes No energy-efficient motors on fans/pumps Yes No Yes No Will the following energy-efficient systems be integrated? Will building automation systems be integrated? Fossil What type of fuel will be used to heat the service water? Electric Will hot water saving devices be integrated? Yes No Are strategies being developed to integrate high efficiency elevators in the building and/or to minimize the need for overall elevator Yes No N/A usage? Are other energy-saving systems or measures (e.g. displacement ventilation, heat recovery systems or desiccant humidification) being considered? Description: Yes No - Where possible, cost effective, and safe, air system - Where ventilation requirements are low, re-use of c - Spaces within the interior/core zones are mechanica Efficient Lumination The New GSB buildings use highly energy efficient lamps such as LED. Light fixtures in offices will be fluorescent type with linear T8 or T5 lamps and electronic ballasts. Dimming ballasts will be used in all areas receiving enough natural daylight to meet the work plane lighting levels (below) without supplemental artificial lighting. Light fixtures in offices, corridors and public toilets will be controlled by occupancy sensing devices, which indirectly achieves task-lighting and personal lighting control standards imposed by Green Globes. Power Generation and Consumption system No boiler is used because the main heating source will be provided by 125 psi campus steam interconnection. No chillers are needed because cooling will be provided by interconnection to the existing campus chilled water loop. A constant temperature variable flow secondary circuit will distribute heating water to the AHU coils via 100% redundant VFD driven pumps. Heat pump (what’s “integrating heat pumps”?) Assume variable speed drives on variable air volume distribution systems and energy-efficient motors on fans/pumps both used Assume building automation system integrated Assume fossil fuel Other Energy Saving Measures Where possible, cost effective, and safe, air systems incorporate heat recovery via heat pipes. Where ventilation requirements are low, re-use of conditioned building return air through air handling unit mixing will be employed. Spaces within the interior/core zones are mechanically ventilated using in-wall displacement ventilation at approximately 0.4cfm/sf