Experimental studies and comparative analysis on various flat plate roof mounted solar energy systems
0
Citation
0
Reference
20
Related Paper
Cite
Cite
Citations (0)
Cite
Citations (0)
Three roof types including single roof without solar collector and two types of integration of flat solar collectors and roof are considered and researched by experimental testing during daytime and nighttime. Through analysis of data from experimental testing, the following conclusions are obtained: (1) During summer daytime, heat flow into the building through the integration of flat solar collector and roof is significantly reduced compared to the roof without collector. The heat gain of sealed type of integration is lower than the none-sealed type of integration. (2) During winter night, heat flow out of the building through the integration of flat solar collector and roof is significantly reduced compared to the roof without collector. The heat loss of sealed type of integration is lower than the none-sealed type of integration. (3) Integration of roof and flat solar collector can reduce the heat gain in summer daytime and heat loss in winter nighttime, the sealed type of integration is better than none-sealed type of integration whether in summer daytime or winter night.
Solar gain
Cite
Citations (2)
Thermosiphon
Cite
Citations (3)
Abstract The flat plate solar energy collector has been re-analysed to give the basic equations necessary to understand how they work and to design new devices. This is a strong deviation from the past, where the heat removal factor was used to determine the water temperature rise. The analysis procedure was developed to allow flexibility so new and novel devices can now be envisioned and designed. Since many readers have computers to solve coupled algebraic equations, the basic equations can be easily manipulated, eliminating the need to use the old charting techniques and are therefore not a serious drawback. In addition, this new procedure allows the reader to calculate the stagnation temperature of the device which was not readily found with contemporary analysis procedures. This is an important design parameter for materials selection in new flat plate solar energy collectors.
Cite
Citations (0)
Flat Plate Collector (FPC) is widely used for domestic hot-water, space heating/drying and for applications requiring fluid temperature less than 100 o C. Three main components associated with FPC namely, absorber plate, top covers and heating pipes.The absorber plate is selective coated to have high absorptivity.It receives heat by solar radiation and by conduction; heat is transferred to the flowing liquid through the heating pipes.The fluid flow through the collector pipes is by natural (thermosyphon effect) or by forced circulation (pump flow).For small water heating systems natural circulation is used for fluid flow.Conventionally, absorbers of all flat plate collectors are straight copper/aluminum sheets however, which limits on the heat collection surface transfer area.Thus, higher heat collection surface area is optimized by changing its geometry with the same space of conventional FPC.The objective of present study is to evaluate the performance of FPC with different geometric absorber configuration.It is expected that with the same collector space higher thermal efficiency or higher water temperature can be obtained.Thus, cost of the FPC can be further bring down by enhancing the collector efficiency.A test setup is fabricated and experiments conduct to study these aspects under laboratory conditions (as per IS standard available for the flat plate collector testing).
Cite
Citations (40)