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P1.1.4 Heating and Insulating Buildings Mr D Powell.

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Presentation on theme: "P1.1.4 Heating and Insulating Buildings Mr D Powell."— Presentation transcript:

1 P1.1.4 Heating and Insulating Buildings Mr D Powell

2 Mr Powell 2012 Index Connection Connect your learning to the content of the lesson Share the process by which the learning will actually take place Explore the outcomes of the learning, emphasising why this will be beneficial for the learner Connection Connect your learning to the content of the lesson Share the process by which the learning will actually take place Explore the outcomes of the learning, emphasising why this will be beneficial for the learner Demonstration Use formative feedback – Assessment for Learning Vary the groupings within the classroom for the purpose of learning – individual; pair; group/team; friendship; teacher selected; single sex; mixed sex Offer different ways for the students to demonstrate their understanding Allow the students to show off their learning Demonstration Use formative feedback – Assessment for Learning Vary the groupings within the classroom for the purpose of learning – individual; pair; group/team; friendship; teacher selected; single sex; mixed sex Offer different ways for the students to demonstrate their understanding Allow the students to show off their learning Activation Construct problem-solving challenges for the students Use a multi-sensory approach – VAK Promote a language of learning to enable the students to talk about their progress or obstacles to it Learning as an active process, so the students arent passive receptors Activation Construct problem-solving challenges for the students Use a multi-sensory approach – VAK Promote a language of learning to enable the students to talk about their progress or obstacles to it Learning as an active process, so the students arent passive receptors Consolidation Structure active reflection on the lesson content and the process of learning Seek transfer between subjects Review the learning from this lesson and preview the learning for the next Promote ways in which the students will remember A news broadcast approach to learning Consolidation Structure active reflection on the lesson content and the process of learning Seek transfer between subjects Review the learning from this lesson and preview the learning for the next Promote ways in which the students will remember A news broadcast approach to learning

3 Mr Powell 2012 Index Quick Summary....

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6 Mr Powell 2012 Index P1.1.4 Heating and Insulating Buildings a) U-values measure how effective a material is as an insulator. b) The lower the U-value, the better the material is as an insulator. c) Solar panels may contain water that is heated by radiation from the Sun. This water may then be used to heat buildings or provide domestic hot water. d) The specific heat capacity of a substance is the amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius. E = mc E is energy transferred in joules, J m is mass in kilograms, kg is temperature change in degrees Celsius, °C c is specific heat capacity in J / kg °C a) U-values measure how effective a material is as an insulator. b) The lower the U-value, the better the material is as an insulator. c) Solar panels may contain water that is heated by radiation from the Sun. This water may then be used to heat buildings or provide domestic hot water. d) The specific heat capacity of a substance is the amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius. E = mc E is energy transferred in joules, J m is mass in kilograms, kg is temperature change in degrees Celsius, °C c is specific heat capacity in J / kg °C

7 Mr Powell 2012 Index Insulation We can insulate our homes to keep the energy in. Different forms of insulation save us different amounts of money as they save different amounts of energy

8 Mr Powell 2012 Index This is usually used when installing an under floor heating system. This consists of; carpet, ceramic tile, etc) screed water pipe floor insulation concrete sub-floor Floor Insulation

9 Mr Powell 2012 Index Cavity Wall Insulation II This insulation is in the form of polystyrene beads. This allows the house to breathe more freely than with the Glassroc

10 Mr Powell 2012 Index This is a very modern form of cavity wall. The Glassroc is made from glass fibres matted together and prevents convection currents Cavity Wall Insulation

11 Mr Powell 2012 Index These brush like structures prevent convection currents around doors and are very cheap to fit. Draught Excluders They also come in a rubber seal form to go around windows

12 Mr Powell 2012 Index Double Glazing Two glass sheets of glass create a sandwich of trapped air. This prevents conduction and convection currents. Often one surface has a special coating to absorb the suns infra red rays.

13 Mr Powell 2012 Index Question 2

14 Mr Powell 2012 Index Learning point a) & b) U - Values This is a measure of the thermal (heat) energy flowing through a building element. The higher the U-value, the more heat flows through, so a good U- value is a low one. The U-VALUE physically describes how much thermal energy in watts (W) is transferred through a building component with an area of 1m 2 at a temperature difference of 1°C. The units for U value are.... W/m 2 °C

15 Mr Powell 2012 Index U-Value Material Types...

16 Mr Powell 2012 Index c) Solar Water Panels Solar heating panels absorb infrared radiation and use it to heat water. The panels are placed to receive the maximum amount of the Suns energy. In the northern hemisphere, they must face south and be angled so that the Suns rays falls on them as directly as possible for as long as possible.

17 Mr Powell 2012 Index d) The specific heat capacity The specific heat capacity of a substance is the amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius. E = m x c x E is energy transferred in joules, J m is mass in kilograms, kg is temperature change in degrees Celsius, °C c is specific heat capacity in J / kg°C

18 Mr Powell 2012 Index Section 1 will require them to: consider the variables (independent, dependent and control) that they will need to manage during the investigation report on their research into how to test the hypothesis they have been given write a detailed plan of their chosen method identify possible hazards and write down how the risks may be minimised draw a suitable blank table suitable for the method they have planned.

19 Mr Powell 2012 Index ISA Preparation ISA Skills for Stage 1 Section 1: Write a plan for your experiment. Stage 3: Carry out a method and obtain results which are recorded in a table. Stage 4: Complete analysis and calculations with the data obtained. ISA Skills for Stage 1 Section 1: Write a plan for your experiment. Stage 3: Carry out a method and obtain results which are recorded in a table. Stage 4: Complete analysis and calculations with the data obtained. P1.1.4 Heating and Insulating Buildings d) The specific heat capacity of a substance is the amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius. E = mc E is energy transferred in joules, J m is mass in kilograms, kg is temperature change in degrees Celsius, °C c is specific heat capacity in J / kg °C P1.1.4 Heating and Insulating Buildings d) The specific heat capacity of a substance is the amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius. E = mc E is energy transferred in joules, J m is mass in kilograms, kg is temperature change in degrees Celsius, °C c is specific heat capacity in J / kg °C

20 Mr Powell 2012 Index How Much Energy do Materials Absorb?

21 Mr Powell 2012 Index Diagram Equipment two digital multimeters (V & A) 12V Metal block Heater Thermometer A A V V 1 kg Metal blocks (Cu, Fe, Al) thermometer, 0 – 100 C 12 V heater power supply, 0 – 12 V DC electrical leads stopwatch

22 Mr Powell 2012 Index Using a Multi-meter Volts or mA or DC Volts Various Ranges Resistance ranges in DC mA various ranges Normal Currents up to 10A

23 Mr Powell 2012 Index Diagram Homework - Design a new experiment? two digital multimeters (V & A) thermometer, 0 – 100 C power supply, 0 – 12 V DC electrical leads stopwatch ? ?

24 Mr Powell 2012 Index Results.... ABCDEFG Metal (1kg) Start Temp / C End Temp / C Temp Rise / C Current /A PD / V Time for rise / s SHC / J /kg°C ?21.53412.52.629.1420801 Al Fe Cu Quoted.... Aluminium (Al) is 902 J /kg°C Iron (Fe) 450 J /kg°C Copper (Cu) is 385 J /kg°C Quoted.... Aluminium (Al) is 902 J /kg°C Iron (Fe) 450 J /kg°C Copper (Cu) is 385 J /kg°C

25 How can you explain these things... P1.1.4 Heating and Insulating Buildings a) U-values measure how effective a material is as an insulator. b) The lower the U-value, the better the material is as an insulator. c) Solar panels may contain water that is heated by radiation from the Sun. This water may then be used to heat buildings or provide domestic hot water. d) The specific heat capacity of a substance is the amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius. E = m c a) U-values measure how effective a material is as an insulator. b) The lower the U-value, the better the material is as an insulator. c) Solar panels may contain water that is heated by radiation from the Sun. This water may then be used to heat buildings or provide domestic hot water. d) The specific heat capacity of a substance is the amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius. E = m c How can you explain these things... P1.1.4 Heating and Insulating Buildings a) U-values measure how effective a material is as an insulator. b) The lower the U-value, the better the material is as an insulator. c) Solar panels may contain water that is heated by radiation from the Sun. This water may then be used to heat buildings or provide domestic hot water. d) The specific heat capacity of a substance is the amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius. E = m c a) U-values measure how effective a material is as an insulator. b) The lower the U-value, the better the material is as an insulator. c) Solar panels may contain water that is heated by radiation from the Sun. This water may then be used to heat buildings or provide domestic hot water. d) The specific heat capacity of a substance is the amount of energy required to change the temperature of one kilogram of the substance by one degree Celsius. E = m c

26 2) The same amount of heat was supplied to different masses of three substances: A, B and C. The temperature rise in each case is shown in the table below. Calculate the specific heat capacities of A, B and C. (FT) A) B) C) Specific Heat Capacity Questions... 4) A microwave oven is used to heat a cold mug of coffee. In a few seconds the temperature of the coffee rises by 70 °C. Showing clearly how you work out your final answer, calculate the heat energy in joules gained by the coffee. Take the mass of the coffee to be 0.2 kg and the specific heat capacity of the coffee to be 4000 J/kg °C. (HT) 3) The table shows how much energy is needed to make the temperature of 1 kg of Different substances rise by 1 °C. Which substance has the highest specific heat capacity? Give a reason for your answer. (FT/HT) 1) Calculate the amount of heat energy which must be supplied to heat 5 kg of water in a bath from 15 °C to 68 °C. Given that the specific heat capacity of water is 4200 J/kg °C. (FT) (Hint use... E = m x c x ) P1.1.4 Heating and Insulating Buildings E = m x c x = 5kg x 4200 J/kg C x (68-15) C = 1113000 E = 111.5kJ E/m = c = 2000J/(1x1) = 2000 J/kg C E/m = c = 2000J/(2x5) = 200 J/kg C E/m = c = 2000J/(0.5x4) = 1000 J/kg C It must be Steel as it takes the most amount of energy to heat 1kg by 1 C E = m x c x = 0.2kg x 4000 J/kg C x 70 C =56,000J E = 56kJ

27 What do they do? P1.1.4 Heating and Insulating Buildings

28 What do they do? P1.1.4 Heating and Insulating Buildings

29 2) The same amount of heat was supplied to different masses of three substances: A, B and C. The temperature rise in each case is shown in the table below. Calculate the specific heat capacities of A, B and C. (FT) A) B) C) Specific Heat Capacity Questions... 4) A microwave oven is used to heat a cold mug of coffee. In a few seconds the temperature of the coffee rises by 70 °C. Showing clearly how you work out your final answer, calculate the heat energy in joules gained by the coffee. Take the mass of the coffee to be 0.2 kg and the specific heat capacity of the coffee to be 4000 J/kg °C. (HT) 3) The table shows how much energy is needed to make the temperature of 1 kg of Different substances rise by 1 °C. Which substance has the highest specific heat capacity? Give a reason for your answer. (FT/HT) 1) Calculate the amount of heat energy which must be supplied to heat 5 kg of water in a bath from 15 °C to 68 °C. Given that the specific heat capacity of water is 4200 J/kg °C. (FT) P1.1.4 Heating and Insulating Buildings

30 2) The same amount of heat was supplied to different masses of three substances: A, B and C. The temperature rise in each case is shown in the table below. Calculate the specific heat capacities of A, B and C. (FT) A) B) C) Specific Heat Capacity Questions... 4) A microwave oven is used to heat a cold mug of coffee. In a few seconds the temperature of the coffee rises by 70 °C. Showing clearly how you work out your final answer, calculate the heat energy in joules gained by the coffee. Take the mass of the coffee to be 0.2 kg and the specific heat capacity of the coffee to be 4000 J/kg °C. (HT) 3) The table shows how much energy is needed to make the temperature of 1 kg of Different substances rise by 1 °C. Which substance has the highest specific heat capacity? Give a reason for your answer. (FT/HT) 1) Calculate the amount of heat energy which must be supplied to heat 5 kg of water in a bath from 15 °C to 68 °C. Given that the specific heat capacity of water is 4200 J/kg °C. (FT) P1.1.4 Heating and Insulating Buildings


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