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The task here involves calculating the wattage needed for Rana's attic room, given that she is moving a heating unit with just enough power for her bathroom. The bathroom's volume is 52 m³, and it has two exterior walls. The attic is 45 m³ in size and has three exterior walls.

### Step-by-step Process:

1. **Bathroom Heating Power**:
   - The bathroom has **two exterior walls**.
   - According to the first table, for **bathrooms** with two exterior walls, there is an additional **20% surcharge**.
   - The bathroom’s size is 52 m³, which falls into the **50–150 m³** range.
   - The wattage per cubic meter for such spaces (under two exterior walls, 50–150 m³) is **70 W/m³** (for a ground floor or attic).
   - Adding the 20% surcharge for bathrooms, we get:
     \[
     \text{Bathroom power} = 70 \, \text{W/m}^3 \times 1.2 \times 52 \, \text{m}^3
     = 4368 \, \text{W}
     \]
   
2. **Attic Heating Power**:
   - The attic has **three exterior walls**.
   - The volume of the attic is 45 m³, which falls into the **less than 50 m³** range.
   - For spaces under 50 m³ with three exterior walls, the wattage per cubic meter is **100 W/m³** (from the second table).
   - Calculating the required power for the attic:
     \[
     \text{Attic power} = 100 \, \text{W/m}^3 \times 45 \, \text{m}^3
     = 4500 \, \text{W}
     \]

3. **Power Deficit**:
   - The heating unit from the bathroom can provide **4368 W**, while the attic requires **4500 W**.
   - The deficit is:
     \[
     4500 \, \text{W} - 4368 \, \text{W} = 132 \, \text{W}
     \]

### Conclusion:
The heating unit will be **132 W short** for adequately heating the attic.

Would you like any further details or clarification on this solution? Here are five related questions you might find interesting:

1. How is the 20% surcharge for bathrooms derived, and when is it applied?
2. How do exterior walls impact the wattage requirements for different rooms?
3. What alternatives exist for rooms with heating deficits like Rana’s attic?
4. How do insulation levels affect the wattage needs per cubic meter in real-world situations?
5. What are the energy efficiency standards for heating systems in different regions?

**Tip:** Always check if the insulation quality of the room matches the assumptions of the table, as poor insulation could significantly increase the wattage needed.

Rana wil een nieuwe verwarming in haar badkamer op de eerste verdieping van 52 m³. De verwarming die ze nu heeft, met precies genoeg verwarmingskracht voor haar badkamer, wil ze verplaatsen naar haar zolder van 45 m³ die nu nog onverwarmd is. De badkamer heeft twee buitenmuren en de zolder drie buitenmuren. Hoeveel watt komt deze verwarming volgens deze tabel nog te kort voor de zolder?

Calculate the wattage requirements for heating Rana's attic and compare it to the existing heating system. This problem explores power deficits due to differing numbers of exterior walls and room sizes, using formulas based on wattage per cubic meter.

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