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Published bySpencer Palmer Modified over 9 years ago
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Systems 3
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Feedbacks
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Coffee System Tc TRTR The hotter the coffee is The faster it cools Tc-T R Cooling Rate The higher the cooling rate The colder the coffee Cooling Rate Tc-T R + -
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Coffee System Tc TRTR The hotter the coffee is The faster it cools Tc-T R Cooling Rate The higher the cooling rate The colder the coffee - + - = -
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Negative connection The higher the cooling rate The colder the coffee Cooling Rate Tc-T R - Tc TRTR
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Positive connection The hotter the coffee is The faster it cools Tc-T R Cooling Rate + Tc TRTR
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Negative feedback loop Tc TRTR The hotter the coffee is The faster it cools Tc-T R Cooling Rate The higher the cooling rate The colder the coffee - + - = -
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Cools with a characteristic time constant, minutes
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Classic Positive Feedback
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Positive Feedback
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Thermostat
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Domestic trouble ?? A husband and wife have an electric blanket that has his and her controls. The husband likes it warm and the wife likes it cold. It’s a very cold night out. What type feedback is it when they have the wrong controls?
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A husband and wife have an electric blanket that has his and her controls. The husband likes it warm and the wife likes it cold. It’s a very cold night out. What type feedback is it when they have the wrong controls? A “positive” feedback loop
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Domestic trouble ?? A husband and wife have an electric blanket that has his and her controls. The husband like it warm and the wife likes it cold. It’s a very cold night out. What type feedback is it when they have the correct controls?
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A husband and wife have an electric blanket that has his and her controls. The husband like it warm and the wife likes it cold. It’s a very cold night out. What type feedback is it when they have the correct controls? Two separate negative feedback loops.
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Equilibrium
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Stable equilibrium (negative feedback)
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Unstable equilibrium (positive feedback),
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Perturbations Small changes that disturb a system from its equilibrium state. Hot Plate
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A simple Earth Heating rate TETE
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A simple Earth Heating rate TETE Albedo Absorbed solar Complete the system diagram
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A simple Earth Heating rate TETE Albedo Absorbed solar Complete the system diagram + -
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Daisy World Average surface Temp Daisy coverage TsDaisies Ts Daisies Albedo
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Daisy World Average surface Temp Ts Daisies Daisy coverage TsDaisies
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Daisy World Average surface Temp Ts Daisies Daisy coverage TsDaisies albedo P1P1 P1P1 Ts Daisies albedo P2P2 P2P2
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