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x = =gt (Ti-Tamb)/I = =gt (Ti-Tamb) =
Presuming a typical ambient temperature of 28.4degC,
Ti= 236.16 degC
Discussion and Conclusions
Staring at the recorded inlet, outlet and ambient temperatures that are highlighted in graph 1, important conclusions, with regards to the system’s adaptability from the new conditions at the outset of the experiment, could be extracted. The nice and cozy up phase from the system can be simply observed because the inlet temperatures from the flow at the outset of the experiment are less than the ambient temperatures. These low inlet temperatures are due to a faulty functioning from the heat exchanger which cannot adequately heat the circulating water. Hence, these values need to be discarded so that accurate results could be acquired.
Generally, bigger values of outlet temperatures could be observed when compared to inlet temperatures from the waterflow and drainage. This will probably happen due to the direct heat exchange between your heat exchanger and also the outlet flow. In addition to this, a continuing increase from the inlet temperatures could be observed. Contrarily, there’s an immediate development of the opening temperatures, especially throughout the warm-up period. It may be also observed that after 29 minutes of operation so when the nice and cozy up period has ended, a continuing distinction between the inlet and outlet temperatures is achieved.
Staring at the immediate efficiencies from the evacuated tube solar thermal collector from graph 2, it may be observed that an optimum efficiency close to 37.5% is achieved. The immediate efficiencies from the collector increase quickly throughout the first 16 minutes of operation, reaching their maximum value and they notice a slight drop before the 29th minute. The immediate efficiencies remain almost constant in a worth of about 29% from that minute on.
The 3rd graph is associated with the behaviour from the solar panel. It may be clearly observed the efficiency wasn’t constant throughout the experimental procedure. The smaller sized the main difference between its inlet temperature and also the ambient temperature, the bigger the efficiency that may be achieved. It is because large variations between these temperatures result in greater heat losses in the system area as well as that the reasonable operational temperatures are maintained.
The intersection reason for the efficiency line and also the x axis is of effective significance because this is the stage where stagnation from the system occurs. Once the line reaches this time, this means the system’s efficiency is equivalent to zero. Within this situation there’s no conversion of solar power into helpful heat since it’s amount is converted straight to heat losses. The stagnation temperature from the system constitute an important parameter for any solar panel design.
Errors observed throughout the experimental procedure
Considering that experiments are man-made systems, tested under artificial conditions, great discrepancies are anticipated when evaluating acquired with real-existence results. The experimental procedure is simply approximately representation from the reality, which sometimes introduces imprecise results. This impreciseness have to be highlighted, so that more reliable conclusions could be mentioned.
First of all, ambient temperatures are an issue which was not appropriately counted. The recorded values were temperatures from the usable interior space from the laboratory, in which the experiment required place. Inside a real situation, the recorded ambient temperature will be the temperature from the outside air. In addition to this, the positioning of the thermometer, near to the source of light, it could trigger an overestimation from the recorded temperatures.
Furthermore, the low degree of insulation put on the manifold and also the water tank, evaluating to some real system’s insulation, might be a factor of inaccurate efficiency estimations the overestimation of warmth losses possibly result in an underestimation from the system’s efficiency.
In addition to this, solar radiation was imprecisely symbolized with a constant light, as hourly variations expected by real-scale solar radiation, couldn’t be counted.
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