40 Questions
What is the main purpose of flat-plate and evacuated-tube solar collectors?
To collect heat for space heating and hot water
Which component of a flat-plate collector is responsible for converting solar energy into heat energy?
The dark flat-plate absorber
How do flat plate collectors differ from evacuated-tube collectors in terms of design?
Evacuated-tube collectors have higher heat retention capabilities
What is the function of a heat-transport fluid in a flat-plate collector?
To remove heat from the absorber plate
In a solar thermal system, what is the role of a heat exchanger?
To transfer heat from the absorber plate to the fluid circulating in the system
What is the main purpose of the heat pipe in a solar thermal system?
To maintain a vacuum and carry heat from the collector
Why is normal water pipe copper unsuitable for heat pipes in solar collectors?
It allows oxygen and trace elements to leach out over time
In a solar thermal system, what is the purpose of the evacuated tube collector?
To improve efficiency by reducing heat loss
What is the area of the collector that is commonly used to calculate collector efficiency?
Aperture area
How does the low pressure (vacuum) in the copper pipes contribute to heat transfer in a heat pipe collector?
It causes the liquid to boil at low temperatures, carrying heat up the pipe
Which technology clearly surpasses flat panels for nearly all water heating applications?
Evacuated tube technology
What material is the header of the evacuated solar thermal collector system made from?
Copper
Which component allows for rapid heat transfer in the solar thermal system?
Heat pipe
What is the main advantage of evacuated tube heat pipe collectors for solar air conditioning?
Ability to attain higher temperatures easily
Which type of connections can be made in the headers of evacuated tube collectors?
Brazed
What is the purpose of the black coating on the flat sheet of material in a solar thermal system?
To absorb energy from the sun
In an evacuated tube collector, what is the function of the selective coating on the inner wall of the glass tube?
To attract and trap the energy of the sun
How does an evacuated tube collector reduce heat loss due to adverse ambient conditions?
By creating a vacuum between two layers of glass
What is the purpose of a manifold in an evacuated tube collector?
To transfer heat trapped in the tubes to water
How does an evacuated tube collector differ from a flat plate collector in terms of heat collection?
It uses the heat pipe principle for heat collection
What is a key characteristic of an Unglazed Air Collector?
It is used to heat ambient air in commercial and industrial applications
How does a Solar Air Collector function?
It absorbs solar insolation with a black metal plate to heat air
Which type of collector works well for pool heating when the ambient temperature is near the desired output temperature?
Unglazed Air Collector
What is the function of a Solar Electrical Power Blower in a Solar Air Collector system?
To pull air through the collector for heating
Which type of collector is commonly used for space heating and is of the recirculating variety?
Glazed Solar Collector
What is the main purpose of the evacuated tube collectors in a solar thermal system?
To transfer solar radiation to a heat pipe
Why is low emissivity borosilicate glass used to make the tubes in solar thermal systems?
To enhance thermal efficiency and durability
What is the function of the barium getter in evacuated tubes used in solar thermal systems?
To indicate when a tube's vacuum has been compromised
How does the energy transfer occur in a heat pipe within the evacuated tube collectors?
The fluid is condensed at the top, transferring latent heat to a liquid in another pipe
Why does holding an evacuated tube filled with hot water not cause it to get warm according to the text?
The vacuum between the glass layers prevents heat transfer
What is the purpose of heliostats in a solar thermal power plant?
To reflect the sun's energy to a single receiver
What is the function of the molten salt in a solar thermal power plant?
To store and transfer heat energy
In a solar thermal power plant, what happens to the used molten salt after generating steam?
It is stored in a cold salt storage tank
What is the role of cold salt storage tank in a solar thermal power plant?
To cool down the used molten salt
What is the relationship between the hot side working temperature and plant efficiency in a solar thermal power plant?
Higher hot side temperature leads to higher efficiency
What is the Carnot cycle efficiency related to in a solar thermal power plant?
Both hot side and cold side temperatures
How does a solar thermal collector work?
By absorbing sunlight to generate heat
What is the purpose of a solar thermal collector?
To convert sunlight into more usable form of energy
How does an evacuated tube collector help in collecting solar energy?
By using vacuum tubes to minimize heat loss.
What technology helps in transferring heat over long distances efficiently in solar applications?
Heat pipe collectors
Learn about the functioning of a solar water heating system, where energy from the sun is absorbed by a metal sheet covered with a black coating. The heat is transferred to water circulating through piping, stored in a geyser, and recirculated through the collector.
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