# How to find the TF of a House Heating System. (New and I need help)

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Bob 2021 年 3 月 29 日

I would appreciate if somebody could explain me, how can I find the Transfer Function from the Heating System below?
I don't know how to start it, I don't know how to start thinking of starting this.
"In the House Heating System below, we insert a Step change from 0 to a Maximum Heating Power of 100kW.
At the same time, we monitor the increase in Temperature.
The Initial Temperature was 283K and the Final Temperature is 303K.
It took 3.33 hours to reach the Final Temperature.
The Thermal Capacity of the house is C = 15*10^6.
Find the Transfer Function and confirm it with Step in Matlab."
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Bob 2021 年 3 月 29 日
Could you be more elaborate please?

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### 採用された回答

Star Strider 2021 年 3 月 29 日
This is actually easier to do by hand:
syms C Tin(t) Win k Tout(t) s H(s)
Eqn = C*diff(Tin) == Win - k*(Tin - Tout)
LEqn = laplace(Eqn)
LEqn = subs(LEqn, {laplace(Tin(t), t, s), laplace(Tout(t), t, s)}, {Tin(s),Tout(s)})
LEqn = expand(LEqn/Tin(s))
LEqn = subs(LEqn, {Tout(s)/Tin(s)}, {H(s)})
LEqn = isolate(LEqn, H(s))

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