A house has well-insulated walls 18.0 cm thick (assume conductivity of air) and area 450 m², a roof of wood 5.0 cm thick and area 270 m², and uncovered windows 0.75 cm thick and total area 34 m². Part A Assuming that heat is lost only by conduction, calculate the rate at which heat must be supplied to this house to maintain its inside temperature at 22 C if the outside temperature is -15 °C. Express your answer using two significant figures. conduction Submit IVE| ΑΣΦ Request Answer ? W
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
![**Heat Transfer Analysis Example**
A house features well-insulated walls, roof, and uncovered windows with the following specifications:
- **Walls**:
- Thickness: 18.0 cm
- Total Area: 450 m²
- Conductivity: Assume the conductivity of air
- **Roof**:
- Made of wood
- Thickness: 5.0 cm
- Total Area: 270 m²
- **Windows**:
- Thickness: 0.75 cm
- Total Area: 34 m²
**Part A**
**Task**: Calculate the rate of heat supply needed to maintain an indoor temperature of 22 °C while the outside temperature is -15 °C. Assume that heat loss occurs only through conduction.
1. **Equation**: Use the equation for heat conduction rate:
\[
\frac{Q_{\text{conduction}}}{t} = \text{(Expression)}
\]
where:
- \( Q \) = Heat transfer
- \( t \) = Time
2. **Answer**:
- Provide the heat transfer rate in Watts (W) using two significant figures.
3. **Input Box**: There is a space for entering the calculation result.
4. **Buttons**: Options for submitting and requesting an answer are available.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7a04a0c8-a6a9-473e-b4ed-0840bde177a1%2F00aef09b-e607-4f71-99f1-080839efef22%2Frr4l9sl_processed.png&w=3840&q=75)
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