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 TREAT Modeling Procedures for Energy Upgrade California TREAT Modeling Procedures for Energy Upgrade California General Best Practices This document is to be followed when using TREAT to model single-­‐family homes in the Energy Upgrade California program. Baseline Model Whether or not the baseline model will be calibrated, PSD highly recommends using the TREAT Building Wizard for all single-­‐family energy modeling to quickly create the home’s envelope, lighting, and appliances. Additionally, the following settings and defaults should be used as a starting point or when the value from the energy audit is not known with a high degree of confidence. These values should be changed/updated when the actual value is observed or measured during home energy audit or based on the homeowner’s input. TREAT Default and Settings Tables The name of each table follows the list of input screens starting at the top left of the TREAT navigation pane. Weather/Defaults Total Occupants (bedrooms <= 4) Total Occupants (bedrooms >4) Use Interior Window Shades Heating and Cooling Season Start and End Month Equals Number of Bedrooms + 1 Equals Number of Bedrooms checked (default) See hyperlink for initial values if not known http://psdconsulting.com/wp-­‐content/uploads/2015/02/TREAT-­‐
Water-­‐Temps-­‐and-­‐Seasons.pdf Run the Model Inspector, don't include months with little or no heating/cooling Weather/Defaults -­‐ Advanced Button Climate Impact on SEER HSPF checked (default) Latent Percentage** 0% (default) Entering Cold Water Temperature http://psdconsulting.com/wp-­‐content/uploads/2015/02/TREAT-­‐
Water-­‐Temps-­‐and-­‐Seasons.pdf **This is the only the latent load associate with the HVAC distribution system(s) and the Fans in TREAT Infiltration – Unconditioned Space Infiltration If the unconditioned space is vented and is the primary location of the ductwork, use 2.0 ACH. Otherwise, use the defaults listed in the table below. Vented Attic (ACH) Vented Crawlspace (ACH) 1.0 0.5 Unvented Crawlspace (ACH) Unconditioned Basement (ACH) 0.2 0.2 TREAT Modeling Procedures for Energy Upgrade California Unvented Attic (ACH) 0.2 Garage (ACH) Walls / Surfaces Typical Surfaces Slab-­‐on-­‐Grade Crawlspace Dirt Floor Uninsulated Crawlspace Walls Uninsulated Floor Above Unconditioned Space Uninsulated 2x4 Wall Uninsulated Ceiling Adjacent to Attic Uninsulated Attic Roof Insulated 2x4 Wall Insulated 2x6 Wall 1.0 TREAT Surface Code Code 63 Code 751 Code 23 Code 55 Code 1 Code 110 Code 375 Code 3 Code 13 Heating/Cooling Ductwork Total Leakage Qualitative Assessment of Ducts CFM25 Supply Very Leaky 225 Leaky 154 Average 83 Tight 23 CFM25 Return 225 154 83 23 Thermostat Settings Heating = 68.7F, no setback schedule Cooling = 76.0F, no setup schedule Domestic Hot Water Supply Temperature = 130F Estimated Demand = 30 Gallons/day per person** **Note that the Hot Water Demand includes all hot water used in the Appliances Domestic Hot Water Piping R-­‐Value Piping in Attic or Crawlspace = R-­‐3 Piping in Basement or Conditioned Space = R-­‐0 Lighting The default lighting density from the Preference File is 2.73 WattHrs/ConditionedFloorArea/Day. When you create a new model, TREAT uses this lighting density and assumes 60W bulbs that are on for an average of 3 hrs/day. These assumptions and defaulted lighting are fine if you are not improving any TREAT Modeling Procedures for Energy Upgrade California lighting. This default lighting should be changed to reflect the actual lighting of the home if lighting improvements are being made. Appliances 1) Model the following appliances, when present, even if they are not being upgraded. a) Clothes washer b) Clothes dryer c) Cooking range, if it uses a fuel d) Dishwasher e) Pool pump Note: These appliances are added by default when you build a new model. You should delete those that do not apply or have usage assumptions that differ from the home being inspected. In the Appliance Library, select the appliance and then click on the Adjust Usage Assumptions button. 2) Model those electric appliances that will be replaced (e.g. refrigerators) 3) All other electric appliances and plugload should be modeled as one misc electric load (MEL) input as described in the table below. The MEL should be adjusted so that the TREAT calculated Electricity Baseload is close to that of the Total Annual Electricity Baseload. When better information is available from (e.g. monthly billing data, annual usage from homeowner), that should be used in place of the Total Annual Electricity Baseload. Total Annual Electricity Baseload (kWh)** Misc Electric Load, MEL Usage (kWh) 2.9 * Cond Floor Area difference between the Total Annual Electricity Baseload and the Electricity Baseload calculated at the bottom of the screen in TREAT MEL Location Conditioned Space % Heat Loss to Space 100% Quantity 1 ** Note this formula comes from analyzing the baseload electricity from the billing data provided in the CalTEST. It is also very similar to the usage found in the RECS 2009 microdata. http://www.eia.gov/consumption/residential/data/2009/index.cfm?view=consumption