Ask Mr. Lewis

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  • #20578
    robert lewis
    Keymaster

    any Questions? Type them here.

    #20609
    Anonymous
    Member

    I noticed the “Heat Transfer through Walls” questions contained negative values for temperature (-27), which resulted in a negative outcome. For example, -884.187 = 0.08187 x 400 x -27. Q= – 884.187.

    However, the “Heat Pump” questions also contained negative values for temperature (-13) but those answers did not result in a negative answer. For example, 21375.64 = 1111 × 1.48 × -13. Q = 21375.64.

    Why does the negative apply for one and not both?

    #20611
    Anonymous
    Member

    I also had a question for how much does the in class assignment count towards overall grade. For instance, I was present first day of class and submitted an answer for the bioswales question. However, I do not see my answer on the list. How does the program account for technical difficulties?

    #20699
    robert lewis
    Keymaster

    Negative answers have meanings that will not be assessed in this class. Since you asked, a negative answer for these problems means heat is being removed from the house. Positive means heat is entering the house.
    The positive/negative answers for the in class group activity are simply because my Excel formula was slightly different when I generated the wall problems and the geothermal problems. I should make them the same, all positive.

    • This reply was modified 10 months, 3 weeks ago by robert lewis.
    • This reply was modified 10 months, 3 weeks ago by robert lewis.
    • This reply was modified 10 months, 3 weeks ago by robert lewis.
    #20700
    robert lewis
    Keymaster

    The technical difficulty was that you posted your answer as a new topic, rather than as a reply to my topic. A couple of other students did as well. I deleted them to keep the number of topics small and easily readable.
    You will not lose any points for that.

    • This reply was modified 10 months, 3 weeks ago by robert lewis.
    • This reply was modified 10 months, 3 weeks ago by robert lewis.
    #20708
    Anonymous
    Member

    You can go to the column, right click, choose numbers, then select Absolute value

    #20916
    Anonymous
    Member

    Hello Mr. Lewis,

    I resubmitted my homework answers yesterday because they didn’t upload the first time due to me using commas. I just checked my grades and I do not see the updates. Please advise.

    Thank you,
    Kathleen Cruz

    #21234
    Anonymous
    Member

    Hi was just wondering about my hw assignment. 823. #7 in the basic add/sub ft/in it has the low number subtract high number. Is that intentional or should I switch it so I don’t get a negative answer?

    #21345
    Anonymous
    Member

    Can you confirm if my Nail Penetration Answer Form was received? 813
    Also, if you can review my answers for “Missing side” #2,5,9,13. I believe there are errors there too.

    Thank you.

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