DHW & Appliances

 Domestic Hot Water, Lighting, and Appliances Analysis

Teams have to discuss the overall design principles of the hot water system. This includes estimated loads, water heating equipment, supply piping, and layout.

Students need to describe the hot water system design in detail, including the supply flow rates and velocities to satisfy the estimated loads. Optionally, they can provide a layout and specification for the hot water supply piping design and a detailed analysis of the water heating equipment and supply piping to the end uses. They should analyze the estimated wait time for hot water delivery and the system losses based on residual hot water left in the piping.

Furthermore, teams should demonstrate compliance with EPA’s WaterSense specifications in design documentation.

Teams also need to discuss the overall approach to lighting and appliances, including example equipment and control scenarios. This should include any lighting analysis, use of daylighting for specific rooms, or high-efficacy electric, and integrated renewable energy powered lighting systems. Optionally, they can discuss the potential for load monitoring and control of large appliances, and general miscellaneous electric loads. If so, they should describe the application of advanced technologies to automate control of energy use and provide energy information that can lead to reduced energy consumption or reduced costs.

Resources

Lawrence Berkeley National Laboratory, Hot Water Draw Patterns in Single-Family Houses:
eetd.lbl.gov/publications/hot-water-draw-patterns-single-family-houses-findings-field-studies_lbnl-4830e.pdf

NREL, Tool for Generating Realistic Residential Hot Water Event Schedules:
www.nrel.gov/docs/fy10osti/47685.pdf

Building America, Top Innovations: Model Simulating Real Domestic Hot Water Use:
apps1.eere.energy.gov/buildings/publications/pdfs/building_america/3_3b_BA_Innov_ModelSimRealDHW_011713.pdf

EPA, WaterSense:
www.epa.gov/watersense

Residential Energy Services Network, Lighting, Appliance and Miscellaneous Energy Usage Profile Amendment:
www.resnet.us/professional/standards/lighting_appliance_misc

Lighting Research Center, Energy Efficient Residential Lighting:
www.lrc.rpi.edu/programs/lightingTransformation/residentialLighting 
www.energystar.gov/index.cfm?c=next_generation.ng_ee_light_app