lab3

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University of Illinois, Urbana Champaign *

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224

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Mechanical Engineering

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Feb 20, 2024

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pdf

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Kyle Carriker ABE 225 February 8, 2024 Lab #3: Improving Energy Efficiency for a Building
Introduction This Lab presented us with a house plan and related information needed to study the effects of an upgraded environmental system on the heating properties of the house. These Values will be used to study the economic effects of heating the house. Purpose and Key Objectives This lab is used to find the heat exchanges of the house before environmental upgrades and after the changes. We then use this information to calculate the cost of heating the house in the two different environmental states. Methods and Approach To approach this problem, we will need to use the RSI values of the home as well as the Area of the different types of Walls, Windows, Doors, Floors, and Ceilings. We will also need the temperature readings of each side of those Areas. We must also use the air leakage and the equation 𝑞 = 𝑃𝐹(∆𝑇) to find the heat loss through air leakage. We will then use the equation 𝑞 = 𝐴𝑟𝑒𝑎 ??𝐼 (∆𝑇) to find the heat transfer rate in Watts. We then use that and convert it to Kilowatts multiply it by 3 cents per kWh and then multiply by 30 days to find the Cost to heat the house per month. Results and Discussion Now we find the Heat exchange rate for each area of the House. Wall o 𝑞 = 143 3.07 (28) =1304.23 Window o 𝑞 = 22 0.5 (28) =1232 Door o 𝑞 = 5.85 0.5 (28) =327.6 Ceiling o 𝑞 = 143 .1 3.65 (26) =1019.34 Floor o 𝑞 = 143 .1 0.776 (12) =2212.89 Air Leakage o 𝑞 = (57)(1.42)(28) =4391 We then find the total loss to be 33009.67W. We then divide by 1000 and multiply by 0.03 cents and multiply by 31 days per month to find the cost per month to be $306.99. We use that cost and the cost per month of the upgraded house to find that the upgrades save the homeowner 48.4% of the heating bill.
The Only possible source of error in this experiment are the use of rounded numbers due to the nature of all the numbers and information being given. Conclusion Overall, this lab taught us the skills and knowledge to find the heat transfer rate of the House. This also taught us how much the heat transfer and air leakage can affect the price to heat a home in colder weather.
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