solar energy practical Flashcards
(18 cards)
The most important part of solar energy?
the collector
the collector
Which can be classified to?
concentrated and non-concentrated
the collector
Which can be classified according to temperature to
low temperature, medium temperature and high temperature collectors
LOW TEMPERATURE COLLECTOR?
Is a collector that is designed to collect heat by absorbing sunlight
and can be used in applications that require low temperature
an example of low temperature collector?
swimming pool
what type does the swimming pool fall under?
1. low
2. medium
3. high
low temperature collector
What does a low-temperature collector do?
It aims to convert the heat energy contained in sunlight into
a more usable and storage form
These collectors are suitable for heating to temperatures below 100 C. what type is it?
low temperature collector
APPLICATIONS OF FLAT PLATE COLLECTOR
- Water heating systems for hotels, residences and in industry.
- Desalination plant for obtaining drinking water from seawater.
- Solar cooker for domestic use.
- Drying applications.
- Residences central heating.
THE ADVANTAGES OF THE FLAT-PLATE
COLLECTORS
- Easy to manufacture.
- Low cost.
- Collect both beam and diffuse radiation.
- Permanently fixed (no sophisticated positioning or tracking
equipment is required).
- Permanently fixed (no sophisticated positioning or tracking
- Requires little maintenance.
THE PRINCIPAL DISADVANTAGES OF A FLAT PLATE
COLLECTOR
The area from which heat is lost is large.
High temperatures cannot be attained and as a result the collection
efficiency is generally low
The radiation absorbed in the absorber plate is lost by convection
Used in applications that
require temperatures between 100ºC and 250ºC. type of solar collectors are used for this type of solar thermal energy: The
Evacuated tube collector (ETC) consists of several rows of parallel
transparent glass tubes connected to a header pipe. What is it?
MEDIUM TEMPERATURE COLLECTOR
What are the mechanisms of medium collectors
Multiple evacuated glass tubes with solar
absorbers collect heat energy from the sun
The absorber inside vacuum tube absorbs radiation
from the sun and heats fluid inside the copper
pipe
Effective whatever the angle of the sun - even on
a cloudy day
APPLICATION OF EVACUATED TUBE COLLECTORS
Refrigeration :
Used for storing frozen foods and fresh food storage
THE ADVANTAGES OF THE EVACUATED TUBE
COLLECTOR
- 1-Achieves a high efficiency with large temperatures.
- 2- low weight .
- 3- Can be used in sub zero temperatures.
- 4- works in cold, windy and humid conditions.
- 5- Less susceptible to corrosion.
- 6- free maintenance
THE DISADVANTAGES OF THE EVACUATED TUBE
COLLECTOR
- 1- not easily integrated into the fabric of the building ( e.g. roof
or facade integrated ). - 2- higher cost.
- 3- less robust.
is the technique
to generate electrical energy through solar radiation.
The production of electrical energy is carried out in
solar thermal power plants that use solar collectors to
concentrate solar radiation at one point.
Using this concentration technique, temperatures above
500 degrees Celsius is achieved, and these are used to
produce steam. What is it?
HIGH TEMPERATURE
THE TECHNOLOGIES USED IN HIGH TEMP TYPE OF
FACILITY ARE
1- Parabolic trough solar collectors : solar
concentrating is used in applications where it is
desirable to reach temperatures higher than
achieved with flat plate collectors.
2- solar Tower plants: This solar thermal energy system is based on
the concentration of solar radiation towards a point on a tower. It is also
known as a central receiver system.
Tower systems are made up of a field of heliostats (2-axis mobile mirrors).
Heliostats capture and concentrate solar radiation on a receiver, installed on
top of a central tower.
