Question: How Is The Performance Of A Flat Plate Solar Collector Evaluated?

How many types of flat plate collectors are there?

Flat-plate collectors are basically divided into two categories according to their use, (i) Water or liquid heaters and (ii) Air heaters and (ii) Air heaters.

These collectors meant for these uses are sub-divided as follows: The schematic diagram of all these collectors, with single glazing are shown in Fig..

What is the function of solar collector?

A solar thermal collector is a device designed specifically to collect heat by absorbing sunlight and may be used to heat air or water for building heating. A solar collector operates on a very simple basis. The radiation from the sun heats a liquid that goes to a hot-water tank.

What is the function of metal flat plate in a solar panel?

Flat-plate and evacuated-tube solar collectors are mainly used to collect heat for space heating, domestic hot water, or cooling with an absorption chiller. In contrast to solar hot water panels, they use a circulating fluid to displace heat to a separated reservoir.

When the sun is directly on the top of head it as referred to?

zenithExplanation: When the sun is directly on the top of the head, it is referred to as sun at zenith. The zenith is an imaginary point directly “above” a particular location, on the imaginary celestial sphere. The zenith is the “highest” point on the celestial sphere.

What is the value of solar constant?

It is most accurately measured from satellites where atmospheric effects are absent. The value of the constant is approximately 1.366 kilowatts per square metre. The “constant” is fairly constant, increasing by only 0.2 percent at the peak of each 11-year solar cycle.

What are the different losses occur in solar collector?

Thermal Losses in a Flat-Plate Collector Heat losses from any solar water heating system take the three modes of heat transfer: radiation, convection and conduction. The conduction heat losses occur from sides and the back of the collector plate.

On what factors does the collector efficiency of a solar flat plate collector depends?

The important factor that affecting flat plate solar collector efficiency, for a given place, is the difference between inlet and outlet water temperatures. The increase in temperature difference negatively affects efficiency. This is due to increased in entropy generation.

How can you increase the efficiency of a flat plate collector?

The radiations coming from the sun’s energy were converted into heat, and then this heat was transferred to the collector fluid, water. A prototype of a solar water heating system was constructed and obtained the improvement of the collector efficiency around 10% by using the reflector.

What is collector efficiency?

Solar collector efficiency. Efficiency, as stated above, is calculated by dividing the “Useful Energy Out” by the “Energy Available.” In the case of the solar heat collector, the Energy Available is the solar radiation that arrives at the collector aperture surface.

How do you calculate the efficiency of a flat plate solar collector?

One method is to compute the thermal efficiency of a collector, which is the ratio of the average heat output from the collector divided by the rate that solar radiation strikes the panel. I = solar radiation intensity striking the collector (Btu/hr/ft2).

What are the main advantages of flat plate solar collector?

Some advantages of the flat-plate collectors are that they are:Easy to manufacture.Low cost.Collect both beam and diffuse radiation.Permanently fixed (no sophisticated positioning or tracking equipment is required)Little maintenance.

How does a flat plate solar collector work?

Flat Plate Solar Collectors. Description: A flat-plate collector is a large, shallow box—typically mounted on a roof—that heats water using the sun’s energy. … Sunlight passes through the glazing and strikes the absorber plate, which heats up, changing solar energy into heat energy.

What are the main components of a flat plate solar collector?

Flat plate collectors consist of a collector surface that absorbs the solar radiation, a glazing to prevent the absorber from reradiating the solar energy, a heat transfer medium (for domestic hot water applications, this is almost always water or a propylene glycol base heat transfer fluid, depending on the climate …

Which is the most common heat loss in flat solar collectors?

1, respectively. The heat loss occurs by all mechanisms as conductive, convective, and radiative heat transfer. The back loss and the edge loss can be minimized by proper selection of insulation material and its thickness. Therefore, the most important heat loss in a flat- plate solar collector is top heat loss.

How do you build a flat plate solar collector?

Here are some easy steps you can follow in building a flat plate solar collector.Step 1 – Test Your Solar Cells. … Step 2 – Cut the Plywood for the Solar Cells. … Step 3 – Varnish the Plywood. … Step 4 – Put Flux on the Solar Cell’s Bus Strips. … Step 5 – Attach the Solar Panel to the Plywood Panel.More items…•

Which collector has maximum efficiency?

Answer: The maximum collector efficiency without reflector is obtained around 51% and with reflector is around 61%. Thus, the presence of reflector increases the collector efficiency of around 10%. The solar collector efficiency of around 55% to 60%, was also obtained by Hematian et al….

What is the use of flat plate collector?

The flat plate collector is also considered as a solar thermal energy device used for the applications of space heating, water heating and other many applications.

How are solar collectors classified?

Solar collectors can be classified into two general categories: (i) non-concentrating and (ii) concentrating. In the non-concentrating type, the collector area (the area that intercepts the solar radiation) is the same as the absorber area (the area that absorbs the radiation) [3].

What are the 2 main disadvantages of solar energy?

Disadvantages of Solar EnergyCost. The initial cost of purchasing a solar system is fairly high. … Weather-Dependent. Although solar energy can still be collected during cloudy and rainy days, the efficiency of the solar system drops. … Solar Energy Storage Is Expensive. … Uses a Lot of Space. … Associated with Pollution.

What is a flat plate?

Medical Definition of flat plate : a radiograph especially of the abdomen taken with the subject lying flat.

Which type of collector can generate more electricity?

solar energy collectorThe hot fluid can be piped to a heat engine, which uses the heat energy to drive machinery, or to generate electricity. This solar energy collector is the most common and best known type of parabolic trough.