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Grades 11 and 12 - Physics - Senior High School - Heating and Insulating Buildings
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Grades 11 and 12 - Physics - Senior High School - Heating and Insulating Buildings
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10 Questions

1. To heat the water in a domestic hot water storage tank from 42°C to 50°C, an immersion heater transfers 4,536 kJ of energy to the water. How much water is in the tank? The specific heat capacity of water is 4,200 J/kgoC
2. At night, a storage heater transfers electrical energy into thermal energy which is stored. During the day, the heat is released to warm the room. Which of the following would store the most thermal energy per kg?
3. If it costs £2,000 to insulate the walls and roof of a house, how long will the payback time be if it saves £250 per year?
4. A homeowner has part of the outside brick wall of her house demolished and fits double-glazed glass doors in the gap. The U-value of the wall was 0.4 and the U-value of glass doors is 1.8. What does this mean?
5. During the day, the Sun transfers energy to an outdoor swimming pool. The mass of water in the pool is 5,000 kg. The specific heat capacity of water is 4,200 J/kg °C. How much energy needs to be supplied to increase the water temperature by 5oC?
6. If it costs £2,000 to insulate the walls and roof of a house, how long will the payback time be if it saves £250 per year?
7. How do solar hot water panels work?
8. To heat the water in a domestic hot water storage tank from 42°C to 50°C, an immersion heater transfers 4,536 kJ of energy to the water. How much water is in the tank? The specific heat capacity of water is 4,200 J/kgoC
9. A homeowner has part of the outside brick wall of her house demolished and fits double-glazed glass doors in the gap. The U-value of the wall was 0.4 and the U-value of glass doors is 1.8. What does this mean?
10. The best insulators have what sort of U-value?

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