Module 2

Module 2 - week 1 40 watt house T(t = Ti DT(1-e^-t/tau The...

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Unformatted text preview: week 1 40 watt house T(t) = Ti + DT(1-e^(-t/tau) The first experiment conducted focused on gathering heating and cooling data for the two different types of model houses, foam insulation and wood insulation, using a 40W bulb. Inside the model house, there were two temperature sensors which were averaged together for data interpretation. The experiment began by inserting the foam "walls" into the house and opening the Data Acquisition Model (DAQ) to input how long the heater was on and how long the test ran in total. The test ran and data was collected that plot a heating and cooling curve for the model house. Graph 1 shows the data collected for the foam walls while Graph 2 shows the data collected for the wood walls. After the data was collected, first-order system models were fitted to the heating and cooling portion of the graphs, Table 1 summarizes the results. Based on the data collected, the foam "walls" had the larger time constant, the time it took to reach the maximum temperature, but it also had the largest T, meaning it held more energy than the wood. Also, based on the calculated R values, foam proved to be a better insulator than wood. Type of Walls Heating or Cooling Curve Heater (W) T i (ºC) T (ºC) (s) R (ºC/W) Foam Heating 40 25.54 24.88 380.77 0.62 Foam Cooling 40 39.59-13.09 240.96-0.33 Wood Heating 40 26.24 13.84 121.15 0.35 Wood Cooling 40 38.79-10.42 117.50-0.26 Table 1 - Describes the calculated values for the elements of a first-order system for the different types of insulation materials and their heating and cooling curves. Graph 1 - Plots the raw data of the average temperature of the house over time for the foam walls. The heater is on up until the maximum point of the graph at which point the heater turns off and the model begins to cool. Graph 2 - Plots the raw data of the average temperature of the house over time for the wood walls. The heater is on up until the maximum point of the graph at which point the heater turns...
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This document was uploaded on 10/07/2011.

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Module 2 - week 1 40 watt house T(t = Ti DT(1-e^-t/tau The...

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