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Because the café is very popular, it usually has enough people inside to keep the indoor temperature above 22 °C.

Because the café is very popular, it usually has enough people inside to keep the indoor temperature above 22 °C.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Heat Storage C2. 1-3

You often do your ARCH 140 homework sitting in one of the many Berkeley cafes. One day, you realize the heat flow dynamics of the café represent a great example of the many topics we discuss in class. Having finished your homework, you're inspired to do a little extra work and conduct your own thermal analysis of the setting. The next day you visit the café during two different one-hour periods and record your observations below. Because the café is very popular, it usually has enough people inside to keep the indoor temperature above 22 °C. When internal heat gains are insufficient, the heater will turn on, but you can ignore that situation in this problem. But when internal heat gains are too high, and it gets too warm, the café has a variable-speed fan rated at 1.42 m3/s to bring in outside air for ventilation and cooling. To simplify the calculations, assume the envelope is perfectly insulated, and the only heat transfer is from air exchange. Evening 12pm - 1pm 9pm-10pm Noon Number of times front door is opened during the hour 95 65 (8.5 m3 of air exchange each time) Outside Air Temperature (°C) 21 11 Material Properties Cp,air 1,005 G kg°C kg Pair = 1.2 m3 Question 1 Noon Evening 12pm - 1pm 9pm-10pm Average number of customers in cafe (100 W each) 80 45 Number of employees (150 W each) 3 Lights (fluorescent bulbs, 25 W each) 12 25 Espresso machine (W) 2,300 2,300 For the noon time period, calculate the rate of total internal gains for the café (in W). Round to the nearest integer. Question 2 Noon Evening 12pm - 1pm 9pm-10pm Average number of customers in cafe (100 W each) 80 45 Number of employees (150 W each) 3 Lights (fluorescent bulbs, 25 W each) 12 25 Espresso machine (W) 2,300 2,300 For the evening time period, calculate the rate of total internal gains for the café (in W). Round to the nearest integer. Question 3 For the noon time period, calculate the total volumetric flow rate of outside air (in m3/s) necessary to maintain an indoor temperature of 22 °C. (Given: qinternal noon = 10,000 W) Round to the nearest tenth. (Note: "Given" value is NOT based on the answer from the previous question)
Transcribed Image Text:You often do your ARCH 140 homework sitting in one of the many Berkeley cafes. One day, you realize the heat flow dynamics of the café represent a great example of the many topics we discuss in class. Having finished your homework, you're inspired to do a little extra work and conduct your own thermal analysis of the setting. The next day you visit the café during two different one-hour periods and record your observations below. Because the café is very popular, it usually has enough people inside to keep the indoor temperature above 22 °C. When internal heat gains are insufficient, the heater will turn on, but you can ignore that situation in this problem. But when internal heat gains are too high, and it gets too warm, the café has a variable-speed fan rated at 1.42 m3/s to bring in outside air for ventilation and cooling. To simplify the calculations, assume the envelope is perfectly insulated, and the only heat transfer is from air exchange. Evening 12pm - 1pm 9pm-10pm Noon Number of times front door is opened during the hour 95 65 (8.5 m3 of air exchange each time) Outside Air Temperature (°C) 21 11 Material Properties Cp,air 1,005 G kg°C kg Pair = 1.2 m3 Question 1 Noon Evening 12pm - 1pm 9pm-10pm Average number of customers in cafe (100 W each) 80 45 Number of employees (150 W each) 3 Lights (fluorescent bulbs, 25 W each) 12 25 Espresso machine (W) 2,300 2,300 For the noon time period, calculate the rate of total internal gains for the café (in W). Round to the nearest integer. Question 2 Noon Evening 12pm - 1pm 9pm-10pm Average number of customers in cafe (100 W each) 80 45 Number of employees (150 W each) 3 Lights (fluorescent bulbs, 25 W each) 12 25 Espresso machine (W) 2,300 2,300 For the evening time period, calculate the rate of total internal gains for the café (in W). Round to the nearest integer. Question 3 For the noon time period, calculate the total volumetric flow rate of outside air (in m3/s) necessary to maintain an indoor temperature of 22 °C. (Given: qinternal noon = 10,000 W) Round to the nearest tenth. (Note: "Given" value is NOT based on the answer from the previous question)
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