Design Of Flat Plate Solar Collector Pdf
Or, Estimating Solar Heating Fraction. To compensate for the low thermal conductivity, a large surface area is provided for heat transfer. Since the heat loss from the top is by convection and radiation, it is more complicated than the bottom heat loss.
The edge loss can be accounted for by simply adding the areas of the back Ac and the edge Ae for back heat loss. The collector tests were performed by Florida Solar Energy Center. And allow efficient transfer of heat to working fluid.
Solar Collector Ratings and Performance. Compiled versions of CoDePro have been distributed to solar engineers from its development level, and it has been modified according to their suggestions. The most important components, that properties determine the efficiency of solar thermal collectors, are glazing and absorbers.
Insulation The insulation helps reduce heat loss from the sides and back of the collector. Common absorber materials include corrugated aluminum or galvanized steel sheets, black metallic screens, or simply any black painted surface.
The net-radiation method was employed to obtain the radiation component of top heat loss from the general collector cover system. Some features of this site may not work without it.
The diagram below shows the basic construction of the collector. Some of the heat loss occurs through the bottom of the collector.
This is as far as I know the only reliable way to get apples to apples numbers on collector performance. This investigation used polystyrene as insulation because it is cheap, easy to find and the most importantly is the polystyrene has good heat insulation characteristic.
Because the edge losses are quit small compared to the top and the bottom losses, they are quite often neglected. Click here to view available product documentation. This type of collector is called a trickle collector and is usually built on site. The insulation material should be dimensionally and chemically stable at high operation temperature.
An aluminium alloy sheet seals the back of the panel and adds to the rigidity of the collector. The calculation of useful energy and top heat loss from the collector is based on the aperture area to make a more accurate prediction of collector performance. This is a question I get asked a lot.
The insulation helps reduce heat loss from the sides and back of the collector. Metadata Show full item record. The program is arranged so that detailed information about the collector can be specified with an easy-to-use graphic interface.
Convection and radiation provide two parallel paths for heat loss from the absorber plate at Tc to the glass cover at Tg, and form the glass cover to the ambient. The perforated absorber sheets are attached to the vertical walls, which are exposed to the sun.
Transparent plastic, vtu software engineering notes pdf such as polycarbonates and acrylics are also used as glazing for flat plate collector. The calculations based on the information from test reports yielded an accurate prediction of the thermal performance of flat-plate solar collectors. Experimental analysis of air flow patterns in performance of flat plate solar collectors. The correlation for natural convection heat transfer between the covers and between the plate and cover was selected with the consideration of the low conductivity of plastics.
In order to minimize the upward heat loss from the collector, more than one transparent glazing may be used. Their basic advantages are low sensitivity to leakage and no need for an additional heat exchanger for drying and space heating applications. Remember me on this computer. Back Sheet An aluminium alloy sheet seals the back of the panel and adds to the rigidity of the collector.
Although such a collector is simple and inexpensive, it has the disadvantages of condensation on the glazing and a higher pumping power requirement. Program develops the efficiency curve given inputs on the collector glazing, absorber, insulation etc. Made from ultra-light weight melamine foam this material is chosen to greatly reduce the weight of the collector.
It uses the your local weather in combination with the efficiency curve for the collector you select to estimate day by day performance for a full year. Copper seems to be the most common material used for absorber plates and tubes because of its high thermal conductivity and high corrosion resistance. Unglazed, transpired solar air collectors offer a low cost opportunity for some applications such as preheating of ventilation air and agricultural drying and curing. Absorber A thin sheet of Aluminium is coated with a highly selective material that is extremely efficient at absorbing sunlight and converting it into usable heat.
Its fairly lengthy to use, but not difficult. All in a very readable format.
The header and riser pipes are brazed together to form a harp shaped heat exchanger that the solar system heat transfer fluid circulates through. Their main advantage is resistance to breakage, although glass can break easily, this disadvantage can be minimized by using tempered glass. Apricus system installed on Mass Maritime Academy. The main disadvantage of plastics is that their transmittance in the longer wave length is also high, therefore, they are not good a trap as glass. This is a very useful simulation tool for determining output from a solar collector for your location and weather.
This paper provides a very simple set of contour plots that show optimum collector orientation, and the performance effect for deviations from optimal. It passes first through the back to the environment. The thickness of the insulator could contribute to the structural rigidity. However, with the increase in the number of cover plates, transmittance is decreased. The absorber sheet is ultrasonically welded to the riser pipes, thus transfers heat to the heat transfer fluid.
Publisher University of Wisconsin-Madison. However, copper is quite expensive. Glass is the most common glazing material. Other disadvantages include deterioration over a period of time due to ultraviolet solar radiation. The aluminium sheet is ultrasonically welded to the copper riser pipes.
Flat Plate Solar Collectors
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