Temperature Change in Room: +22 to 15 Degrees C

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SUMMARY

The discussion focuses on calculating the time constant of a room's temperature change from +22 degrees Celsius to 15 degrees Celsius over 8 hours, with an outdoor temperature of -5 degrees Celsius. The time constant is defined as the duration required for the temperature to decrease to approximately 36.8% of its initial value. Participants clarify that the time constant is a crucial parameter in thermal dynamics, specifically in understanding how quickly a system responds to temperature changes.

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  • Understanding of thermal dynamics and heat transfer principles
  • Familiarity with the concept of time constants in physics
  • Basic knowledge of exponential decay functions
  • Ability to perform calculations involving temperature changes over time
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  • Explore the impact of outdoor temperature on indoor thermal dynamics
  • Learn about Newton's Law of Cooling and its applications
  • Investigate methods for measuring and modeling temperature changes in enclosed spaces
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This discussion is beneficial for physicists, engineers, and anyone involved in HVAC (Heating, Ventilation, and Air Conditioning) system design and analysis, as well as those studying thermal dynamics and environmental control systems.

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A room has temp at +22 degrees C, and after 8 hours it has fallen to 15. What is the rooms "time constant" when the outdoor temp is -5 C? I have no idea what is beeing asked about here, could someone help me...?
 
Last edited:
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The time constant of a system is the time taken for the relevant quantity (in this case, the temperature) to decrease to 1/e (about 36.8%) of its initial value.

- Warren
 

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