Question: What Is The Efficiency Of Flat Plate Collector?

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..

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

It depends upon the factors like inlet and outlet water temperature, the ambient temperature, area of the collector etc. The importance of heat removal factors remains with the efficiency of the system. For a highly efficient system a higher value of heat removal factor is must.

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.

Which parameters can affect on performance of flat plate collector?

Water is considered in the present study as the working fluid. Other factors affect the efficiency of the collector as the water rate of flow, selective coatings of the front surface of the absorber, heat losses by convection and radiation, the surface absorptivity of the surface.

How does a flat plate 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 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.

How much solar radiation reaches the earth?

About 23 percent of incoming solar energy is absorbed in the atmosphere by water vapor, dust, and ozone, and 48 percent passes through the atmosphere and is absorbed by the surface. Thus, about 71 percent of the total incoming solar energy is absorbed by the Earth system.

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 …

How is the performance of a flat plate solar collector evaluated?

Conclusion. The solar flat plate collector (SFPC) performance was evaluated through CFD simulations. It was observed that water gave higher efficiency due to high density and thermal conductivity. The simulation results gathered revealed that the temperature of water and air was raised up to 79 °C and 73 °C.

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 a flat plate collector?

A flat-plate collector (FPC) is a device to collect solar energy and transform it into thermal energy (low-grade energy) by using water as a working fluid. It is a heart of solar thermal devices that has many applications in a medium temperature range ≅100 °C from domestic to preheating to industrial sectors.

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 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 is collector efficiency?

Collector efficiency is expressed as the ratio of solar energy collected divided by the solar energy available. Insolation is a term used to express the solar energy available.

Which part of flat plate collector is coated in black?

6. Which part of flat plate collectors is coated in black? Explanation: Absorber plate is usually metallic or coated in black surface which is used for absorbing radiation energy. The absorber plate’s coating directly affects how efficient the collector is.