Low & Zero-Carbon Technologies in Buildings Quiz
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Questions and Answers

What is the thermal efficiency of traditional grid-supplied electricity generated in central power stations?

  • 60%
  • 30%
  • 40% (correct)
  • 50%

    • What type of power stations achieve efficiencies of 50% by using gas turbines and steam turbines in combination?

  • Renewable energy power stations
  • Cogeneration power stations (correct)
  • Geothermal power stations
  • Hydropower stations

    • What percentage of the primary energy delivered to a power station can be exhausted as waste heat?

  • 40%
  • 60%
  • 50% (correct)
  • 30%

    • What is the maximum theoretical efficiency formula for a heat engine cycle?

    <p>$1 - T_1$</p> Signup and view all the answers

    In the context of a gas fuelled CHP unit, what is the electrical output if the heat output is 149 kW and the plant operates for 16 hours/day?

    <p>80 kW</p> Signup and view all the answers

    What is the mechanical efficiency of an engine that has an electrical output of 80 kW and heat output of 149 kW?

    <p>35%</p> Signup and view all the answers

    What is the primary function of a heat pump?

    <p>Generate heat in the space around the refrigerator</p> Signup and view all the answers

    Which component of a heat pump is responsible for raising the pressure of the refrigerant gas?

    <p>Compressor</p> Signup and view all the answers

    What is the purpose of the expansion device in a heat pump system?

    <p>To reduce the pressure of the high-pressure liquid</p> Signup and view all the answers

    How is the performance of a heat pump described?

    <p>By Coefficient Of Performance (COP)</p> Signup and view all the answers

    What does the Coefficient Of Performance (COP) represent in a heat pump system?

    <p>Ratio of heat output to energy input</p> Signup and view all the answers

    In a heat pump, what are T1 and T2 in relation to the Coefficient Of Performance (COP)?

    <p>T1 is the absolute evaporator temperature, and T2 is absolute condenser temperature</p> Signup and view all the answers

    What is the coefficient of performance (COP) for the heat pump in the given scenario?

    <p>0.15</p> Signup and view all the answers

    In the context of heating a building with a heat pump, what does COP stand for?

    <p>Coefficient of Performance</p> Signup and view all the answers

    What is the heating load for the building that needs to be heated by the heat pump during winter?

    <p>25 KW</p> Signup and view all the answers

    If a ground source heat pump has a COP of 4, what is its energy input when supplying heat to the underfloor heating system?

    <p>10 KW</p> Signup and view all the answers

    What does the kinetic energy in wind flow depend on according to the text?

    <p>Mass of air flow and Velocity</p> Signup and view all the answers

    How is air flow approaching a horizontal axis wind turbine visualized more easily according to the text?

    <p>In volumetric terms</p> Signup and view all the answers

    What is the primary focus of low & zero-carbon technologies in buildings?

    <p>Reducing energy consumption in buildings</p> Signup and view all the answers

    Which sector in the European Union contributes most to carbon emissions?

    <p>Buildings sector</p> Signup and view all the answers

    What is one way to achieve energy minimization in building design?

    <p>Utilizing passive energy sources</p> Signup and view all the answers

    What is a key function of electricity in buildings according to the text?

    <p>Providing heating and cooling for buildings</p> Signup and view all the answers

    Which of the following does NOT describe electricity as mentioned in the text?

    <p>Limited to heating buildings</p> Signup and view all the answers

    Why are well-insulated buildings emphasized in the context of low & zero-carbon technologies?

    <p>To reduce the need for heating and cooling</p> Signup and view all the answers

    What is the formula used to calculate the energy in the approaching wind?

    <p>$0.5 x x^{1.2} x 16.52 x 123$</p> Signup and view all the answers

    How can buildings be connected to solve the problem of relying on wind power?

    <p>By connecting to the supply authority grid in case the wind stops blowing</p> Signup and view all the answers

    What are the two main types of solar collectors mentioned in the text?

    <p>Flat plate and evacuated tube collectors</p> Signup and view all the answers

    What is the formula used to calculate the power output from a wind turbine?

    <p>$0.5 x m x (1^2 - 2^2) 21/44$</p> Signup and view all the answers

    What is the ideal orientation for a solar collector in Egypt?

    <p>South-facing at a 30 degree angle</p> Signup and view all the answers

    What are the key requirements for a solar collector to be functional?

    <p>It must be mounted at a suitable angle to face the sun, not be overshaded, and be placed on the roof</p> Signup and view all the answers

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