Low & Zero-Carbon Technologies in Buildings Quiz

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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?

$1 - T_1$ 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?

80 kW 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?

35% Signup and view all the answers

What is the primary function of a heat pump?

Generate heat in the space around the refrigerator Signup and view all the answers

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

Compressor Signup and view all the answers

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

To reduce the pressure of the high-pressure liquid Signup and view all the answers

How is the performance of a heat pump described?

By Coefficient Of Performance (COP) Signup and view all the answers

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

Ratio of heat output to energy input Signup and view all the answers

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

T1 is the absolute evaporator temperature, and T2 is absolute condenser temperature Signup and view all the answers

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

0.15 Signup and view all the answers

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

Coefficient of Performance 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?

25 KW 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?

10 KW Signup and view all the answers

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

Mass of air flow and Velocity Signup and view all the answers

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

In volumetric terms Signup and view all the answers

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

Reducing energy consumption in buildings Signup and view all the answers

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

Buildings sector Signup and view all the answers

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

Utilizing passive energy sources Signup and view all the answers

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

Providing heating and cooling for buildings Signup and view all the answers

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

Limited to heating buildings Signup and view all the answers

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

To reduce the need for heating and cooling Signup and view all the answers

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

$0.5 x x^{1.2} x 16.52 x 123$ Signup and view all the answers

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

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

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

Flat plate and evacuated tube collectors Signup and view all the answers

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

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

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

South-facing at a 30 degree angle Signup and view all the answers

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

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