Energy Efficient BuildingsE/3 Houses and Simulation Homework

Existing Building SimulationCreate a MS Word document and add the title “Existing Building Simulation”. Assume that electricity generates 2.0 lb-CO2/kWh and natural gas generates 117 lb-CO2/mmBtu. Assume that electricity costs $0.10 /kWh and natural gas cost $10 /mmBtu.

1) Describe Existing Building Label the first section “Building Description”. Copy the sketch, description of building, and building energy use from below into this section.

Basehouse

Window area = 10% of each wall ACHhouse = 0.5 air changes per hourRwalls = 15 hr-ft2-F/Btu Qelec = 0.75 kWRwindows = 2 hr-ft2-F/Btu Occupancy = 4 people at restRceiling = 25 hr-ft2-F/Btu Tia = 72 FRroof = 2 hr-ft2-F/Btu wia = 0.0083 lbw/lba (RHia = 50%)SHGC,normal = 0.70 Eff-furnace = 0.80Solar absorbtivity walls = 0.2 SEER-air conditioner = 12 Btu/W-hrSolar absorbtivity roof = 0.9 h,exterior,avg = 5 Btu/hr-ft2-FRfloor = 2, Rslab,per = 5 hr-ft2-F/Btu No overhangs over windows

Basehouse_2007.utl12 31 2006 -99 -99 -991 31 2007 526 -99 842 28 2007 503 -99 1103 31 2007 622 -99 484 30 2007 658 -99 365 31 2007 858 -99 86 30 2007 1019 -99 37 31 2007 1037 -99 28 31 2007 1116 -99 29 30 2007 894 -99 610 31 2007 754 -99 1811 30 2007 549 -99 5512 31 2007 509 -99 82

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2) Develop Calibrated Model of Existing Building: Develop an ESim model of the base house in Dayton Ohio and calibrate it to the actual energy use of the base house during calendar year 2007 as compiled in basehouse_2007.utl. To do so, you will:

a. Load Lonsdale.szb into ESim.b. Load basehouse_2007.utl into ESim.c. Create a WEA file of calendar year 2007 weather data using ESim’s “Make

WEA File from Daily Temps” feature, and load the WEA file into ESim.d. Simulate annual electricity and gas use.e. Modify Lonsdale.szb as needed (and save it under another name) to

describe the basehouse rather than the Lonsdale house and calibrate the simulation to basehouse_2007.utl.

Document your results in a new section in the MS Word document called “Calibrated Simulation Model”. Copy the ESim screens showing calibrated electricity and natural gas use into the clipboard (press Ctrl + PrintScreen), and pasting the screen into the MS Word document. Comment on the agreement between simulated and measured energy use.

3) Develop Baseline Simulation Model: Run calibrated ESim model with TMY3 file for Dayton, OH to create baseline. Document your results in a new section in the MS Word document called “Baseline Simulation Model”. Copy the ESim screens showing calibrated electricity and natural gas use into the clipboard (press Ctrl + PrintScreen), and pasting the screen into this section.

4) Determine Individual Savings Opportunities For Existing Building: Identify 3 energy savings opportunities that could be implemented in an existing house. Determine the annual electricity and natural gas savings associated with each individual energy saving opportunity, as the difference between the annual electricity and natural gas savings and the baseline simulation model.

To document your work, create a separate section of the report for each energy saving opportunity and label the section with the name of the energy saving opportunity. In each of these sections, first describe the energy saving opportunity, then copy screen shots of the ESIM output with the new electricity and natural gas use, then clearly show the energy savings associated with each opportunity. Calculate the total projected annual energy, cost and CO2 emission savings of each opportunity.

5) Finally, determine the annual electricity and natural gas savings if all three energy saving opportunities were simultaneously implemented. To document your work, create a new section of the report called “Synergistic Savings”. In this section, summarize the three energy saving opportunities, then show screen

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shots of the ESIM output with the new electricity and natural gas use, then clearly show the synergistic energy savings from implementing all three savings opportunities. Calculate the total projected annual energy, cost and CO2 emission savings of the combined opportunities Comment on why the total savings calculated by summing individual recommendations and the synergistic savings are different.

New Building SimulationCreate a MS Word document and add the title “New Building Simulation”. Assume that electricity generates 2 lb-CO2/kWh and natural gas generates 117 lb-CO2/mmBtu. Assume that electricity costs $0.10 /kWh and natural gas cost $10 /mmBtu.

1) Describe Existing Building The University of Dayton is considering building a new student house as shown below. The dimensions of the slab are 36 feet x 22 feet, and each of story is 9 feet high.

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Design the base case house with standard energy efficiency features, such as 2x4 walls, single glazed windows, furnace eff = 0.8, AC SEER = 12, etc. Label the first section of the MS Word document “Base Case Building Description”. Copy the pictures of the house into this section and briefly describe the relevant energy features of the house.2) Simulate Energy Consumption of Base Case House Simulate the energy consumption of the base-case house using the Dayton, TMY3 weather file. Document your results by creating a new section of the document labeled “Base Case Building Simulation”. Copy the ESim screens showing expected electricity and natural gas use into this section. Calculate the total projected annual energy use, cost and CO2 emissions of the house.3) Design CO 2/3 House: Identify changes to the base house that will result in a new energy-efficient house that produces 1/3 or less of the CO2 of the base case design. Document your results by creating a new section of the document labeled “CO2/3 House Building Simulation”. List all changes made to the base case house to achieve a new CO2/3 design. Copy the ESim screens showing expected electricity and natural gas use of the energy-efficient house into this section. Calculate the total projected energy use, cost and CO2 emissions associated with the energy-efficient house.

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