Energy Management Chapter 09: Alternative Energy

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Questions and Answers

What is the primary function of evacuated tubes?

To convert heat into mechanical energy
To store energy for later use
To generate electricity
To trap heat from solar radiation (correct)

Evacuated tubes allow heat to escape easily through convection.

False (B)

What is the identification number mentioned in the content?

11223344
98765432
12345678
50225245 (correct)

What allows solar radiation to enter an evacuated tube?

The glass tube Signup and view all the answers

Essam Abo Yehia is a recognized doctor.

True (A) Signup and view all the answers

Heat is trapped from escaping due to __________ in evacuated tubes.

vacuum Signup and view all the answers

Match the following features with their descriptions for evacuated tubes:

Glass tube = Permits solar radiation Vacuum = Prevents heat loss through convection Heat trapping = Maximizes thermal efficiency Convection = Is minimized due to the vacuum Signup and view all the answers

Who is the individual mentioned in the content?

Essam Abo Yehia Signup and view all the answers

The name of the doctor is __________.

Essam Abo Yehia Signup and view all the answers

Match the following details with the correct information:

Essam Abo Yehia = Doctor 50225245 = Identification Number دكتور عصام ابو يحيي = Arabic Name Abo = Father of Signup and view all the answers

What is usually a part of the solar heating or cooling system?

Thermal storage systems (D) Signup and view all the answers

Energy demand is always linked to solar energy availability.

False (B) Signup and view all the answers

What is the primary purpose of a thermal storage system?

To store energy for later use when solar energy is not available. Signup and view all the answers

A thermal storage system is usually a part of the solar ________ or cooling system.

heating Signup and view all the answers

Match the following terms with their descriptions:

Thermal storage systems = Integral to solar heating and cooling Solar energy availability = Not always aligned with energy demand Energy demand = The need for energy consumption Solar heating = Uses thermal energy from the sun Signup and view all the answers

What is a primary application of the Compound Parabolic Concentrator (CPC)?

Residential and commercial heating (C) Signup and view all the answers

The Compound Parabolic Concentrator (CPC) is only used for commercial heating applications.

False (B) Signup and view all the answers

What does CPC stand for?

Compound Parabolic Concentrator Signup and view all the answers

The Compound Parabolic Concentrator is primarily associated with __________ applications.

heating Signup and view all the answers

Match the following applications with the correct description:

Residential heating = Heating for homes and individual households Commercial heating = Heating for larger buildings and businesses Signup and view all the answers

What is the relationship between the rotor blade length and the power available to the turbine?

A small increase in rotor blade length results in a larger increase in available power. (C) Signup and view all the answers

Increasing the rotor blade length results in a decrease in the power available to the turbine.

False (B) Signup and view all the answers

What does A represent in the context of the swept area formula?

Swept area Signup and view all the answers

A small increase in the rotor blade length leads to a larger increase in the available power to the ______.

turbine Signup and view all the answers

Match the following variables with their respective descriptions:

r = Rotor blade length A = Swept area Power = Energy available to the turbine Increase = Result of increasing rotor blade length Signup and view all the answers

What is the average noontime radiation rate at 40° north latitude on a clear day?

946 W/m2 (C) Signup and view all the answers

A solar collector can collect 100% of the energy that strikes it.

False (B) Signup and view all the answers

How much area is realistically needed for solar collectors to provide 293 kWh of energy per day?

53 m2 Signup and view all the answers

The noontime radiation rate on a flat surface normal to the sun’s rays is about _____ W/m2 at 40° north latitude.

946 Signup and view all the answers

Match the following measurements with their units:

Energy = kWh Area = m2 Radiation Rate = W/m2 Energy (thermal) = Btu Signup and view all the answers

What factors are taken into account for a realistic solar collector area calculation?

The energy collected and percent sunshine (B) Signup and view all the answers

The energy provided by solar collectors can be calculated based solely on sunlight availability.

False (B) Signup and view all the answers

On a clear day, if the percent sunshine is around 70%, the likely energy collected would be _____ percent.

70 Signup and view all the answers

Flashcards

Noontime radiation rate

The amount of solar energy received per unit area at noon on a surface perpendicular to the sun's rays.

Radiation rate example

At 40° north latitude on a clear day, the noontime radiation rate is about 946 W/m².