What is the efficiency of flat plate collector?
A Flat Plate Collectors for Process Heat (90 to 150°C)
Under these conditions, a conventional flat plate collector with a spectrally selective absorber and single glazing has an efficiency of approximately 20 % only, whereas vacuum tube collectors reach about 50 %.
How do you calculate the efficiency of a 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 factors influence the efficiency of a flat plate solar 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 do you calculate optimum collector efficiency?
By the sunlight energy. Available we get a collector efficiency of 960 divided by 2,000. Or 48 percent this is our estimate. Using the flow rate method. The tank temperature method.
What is collector efficiency factor?
The collector efficiency factor F′ is defined as the ratio of the actual thermal collector power to the power of an ideal collector whose absorber temperature is equal to the fluid temperature (cf.
What is the 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.
What is flat plate collector?
What is collector efficiency?
The collector efficiency is defined as the ratio of useful heat gained by the collector per unit of aperture area (W/m2) to the total irradiation of the collector (W/m2).
What is collector flow factor?
The collector efficiency factor is essentially a constant factor for any collector design and fluid flow rate. The ratio of UL to Cb, the ratio of UL to hfi, and the fin efficiency, F, are the only variables appearing in Eq. (3.48) that may be functions of temperature.
What is the temperature range for flat plate collector?
Flat plate collectors are categorized as stationary collectors, having unity concentration ratio and temperature range use for standard collectors between 30-80ºC, heating water, air or other gases [2]. Highly selective coatings may be used to reach higher temperatures.
What is the value range of collector efficiency factor?
This parameter ranges from 50% (some evacuatedcollectors) to 95% (unglazed absorber). Most classical solar collectors range betwen 70% and 90% The heat loss coefficient, which is the density of heat flow rate leaviong the collector for 1 degree temperature difference.
What are limitations of flat plate collectors?
The principal disadvantage of a flat plate collector is that because of the absence of optical concentration, the area from which heat is lost is large. Also due to the same reason high temperatures cannot be attained and as a result the collection efficiency is generally low.
In which collector the efficiency is maximum?
In tests, Absolicon solar collector has shown to have an efficiency of 76.4%. This is the highest number ever achieved for a small parabolic trough.
What are the two types of flat plate collector?
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.
What is the advantage of flat plate collector?
Easy to manufacture. Low cost. Collect both beam and diffuse radiation. Permanently fixed (no sophisticated positioning or tracking equipment is required)