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Azm solar powered greenhouse exhaust fan

Postby Faushakar В» 16.11.2019

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Here, we present a system that reduces interior temperature of the arbor while increasing humidity. Also, the system generates required electricity with a solar photovoltaic module to power pressurized water pump through an inverter and stores it in a battery for use when there is no sunlight. The model of the photovoltaic module was implemented using a Matlab program. As a result of being an uncomplicated system, return on investment for the system is 3.

The cooling techniques can be categorized into several forms, including pad and fan, misting, and fog. Each cooling technique utilizes the evaporative cooling EC process to decrease air temperature, as well as fan ventilation for exchanging the moist air with dry outside air. The impression of each system is highly dependent on the ambient air-water vapor properties.

Low air humidity will increase the cooling capacity of the evaporative system, while higher humidity will decrease cooling. In addition, cooling effect is dependent on the nozzle design and system operating pressure, which directly influences evaporation of the droplet due to the droplet size delivered from the nozzle. Water quality is important for the long term effectiveness and required maintenance of EC systems [ 1 ]. Providing thermal comfort conditions, the comparison of the economic and environmental aspects of evaporative and vapor compression cooling systems with the same capacity shows that EC systems have less operating cost and in terms of equivalent CO 2 emissions are more environmental compared to vapor compression cooling systems.

Different air condition should employ different EC type. Air in contact with water directly is the feature of direct EC type misting [ 2 ]. Recently, the direct and indirect evaporative cooling EC system has attracted more and more attention due to its superiority of high energy efficiency and environmental friendliness [ 3 — 17 ]. Wong and Chong [ 18 ] examined the difference in thermal comfort levels provided by the misting fan system as well as the possible increase in biological pollutants due to the increase in relative humidity brought about by the generation of mists.

Katsoulas et al. Dombrovsky et al. Sethi and Sharma [ 21 ] reviewed the available international cooling technologies for agricultural greenhouses and discussed the representative applications of each technology. Burger [ 22 ] examined the intermittent mist control via solar cells.

Hourly data were obtained from UC Davis California Irrigation Management and Information System station for comparisons between Weather Watcher responses and evapotranspiration or 1 solar radiation.

Zhang et al. The results showed that an optimal spray cycle and optimal duty ratio make more efficient use of the coolant in intermittent-spray cooling. Atieh and Al Shariff [ 14 ] demonstrated for the first time to our knowledge a misting system that is powered by solar energy.

The system was used to cool down an open area in Medina, Saudi Arabia. The ambient and surrounding temperatures were measured and compared for different timing signals that were applied to the misting system. The used solar panel performance was evaluated for different loads and tilting settings. The return on investment for the misting system was found to be about two years and a half. Eicker et al. Ban-Weiss et al. Since air conditioning systems have been introduced, they became part of daily life in many areas.

However, air conditioning systems are relatively expensive large portion of the electrical bill in hot weather regions is contributed to the energy consumed by the air conditioners , and they are not environmentally friendly. In addition to that, they are inefficient when used in outdoor and open areas such as arbor, streets, and parks. Thus new technologies become necessary to develop an efficient, low cost, environmentally friendly system that is capable of reducing the temperature using low cost components that are easy to run and maintain and flexible to be utilized [ 14 ].

In this study, solar assisted cooling system is implemented in an arbor of a site in Elazig. The temperature distribution of the arbor area was investigated by thermal camera images. Modeling of the solar cell used in the study is also conducted. This system is environmentally friendly, inexpensive, and healthy. If any cooling system is aimed at being applicable, it must be suitable by being economically feasible. Therefore return on investment of the proposed system is evaluated lastly.

Water misting systems work by forcing water via a high pressure pump and tubing through a brass and stainless steel mist nozzle that has an orifice of about 5 micrometres, thereby producing a microfine mist. The water droplets that create the mist are so small that they instantly flash-evaporate. For Patio systems, it is ideal to mount the mist line approximately 8 to 10 feet 2.

Misting is used for applications such as flowerbeds, pets, livestock, kennels, insect control, odor control, zoos, veterinary clinics, cooling of produce, and greenhouses [ 2 ].

The technology used is direct EC which is efficient and productive. Misting systems are also used because the mist that is produced is so fine that there is no chance of the surrounding area becoming wet. The effect of this system compares to that of standing in middle of a fog. One remains cooler but does not become wet. A person can only become wet from the system if they stand The water produced from this system is also hygienic.

This is because the water is filtered of impurities before it is released through the nozzles. It is also economical because it uses an average of four to eight liters per hour. There are also many outstanding features and benefits that water mist system offers which are [ 26 ] i being suitable for a wide range of outdoor applications, ii requiring small space and being very light, iii being environmentally friendly, iv being nontoxic, v having highly efficient heat suppression capability, vi using limited quantity of water, vii being cost-effective compared to other heat reducing equipment like air conditions, viii driving away many insects like mosquitoes, flies, and wasps from the area, ix cleaning the surrounding area from dust and other common pollutants.

The appearance of typical misting system during the study is shown in Figure 1. The mean sunshine duration and outside air temperature which is higher than other months are available in July for Elazig.

Relative humidity is lowest in this month. For the province of Elazig meteorological values are given in Table 1. For a period of 3 hours of Elazig outside temperature changes are given in Figure 2 for the month of July. The data for the other years was also reviewed and similar conclusions were achieved. These results provide great evidence that the misting system is well suited for operation in Elazig, Turkey. It will be useful to analyze PV panel performance before analyzing general performance of the system.

Therefore, characteristics of solar panel are considered under a separated heading in this study. A PV panel consists of generator solar cells, junctions, protector parts, and secondary elements.

Solar cells consist of p-n junctions that are aggregated on a thin silicon circuit sheet or on a semiconductor layer. When solar energy photons arrives in solar cell with an amount of energy greater than band gap energy of the semiconductor, collision occurs and then electron pair arises.

These carriers are swept to a separated area under the influence of interior electric field of p-n junctions and create a current proportional to incident radiation. This current flows to external circuit when short circuit occurs in the panel cell and it is directed to interior parallel circuit by p-n junction diode when the circuit is open.

Thus, characteristics of this diode shape the open circuit characteristics of the panel cell. Therefore, the simplest solar cell equivalent circuit is a parallel current source with the diode. Output acquired from current source is directly proportional to radiation on the panel cell. Solar cell is not an active element in dark. It performs as a diode. It does not generate current or voltage. Diode determines the characteristics of the cell. In order to achieve the best chart curve match-up, the diode ideality factor and a single parallel diode were used.

This model is the simplified version of two-diode model by Gow and Manning [ 34 ]. Solar cell circuit diagram is shown in Figure 4. Middle level complexity model was used in this study. Consider where is elementary charge 1.

Equations 2 , 3 , and 4 are not enough to draw the curve: , , and are required to complete the model. We should know the values of because it has a considerable effect on characteristic curves:. Constants in these equations can be determined by analyzing curve charts which are measured or published in product catalogues of PV system producers. Specific characteristics of solar cell for determined and are shown in Figure 3.

Characteristic of a resistive charge is a linear line within the scope of. Also it should be mentioned that power delivered to this charge is based only on the resistance value [ 32 ]. However, panel has an effect on field of the curve chart if value is low. Cell acts as a constant current source here and it is almost equal to short circuit current. On the other hand panel has an effect on field of the curve chart if value is high. Cell acts as a constant voltage source here and it is almost equal to open circuit voltage [ 29 ].

A real solar cell can be characterized by the following basic parameters shown in Figure 5. Short circuit current, : this is the maximum current value produced by the cell. It can be produced by short circuit conditions. Open circuit voltage corresponds to diminished voltage in the diode p-n junction when it is crossed by.

In other words, it represents the cell voltage in dark, when the produced voltage is. Maximum power point is the operating point in Figure 5. This is the consumed power when the resistive charge level is maximum:.

Maximum efficiency is the ratio between maximum power and incident light:. The efficiency of our system was calculated and the result was found as Fill factor is the ratio between maximum power delivered to charge and output of and :. Fill factor is a measure of actual characteristics.

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Re: azm solar powered greenhouse exhaust fan

Postby Aram В» 16.11.2019

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Re: azm solar powered greenhouse exhaust fan

Postby Dojind В» 16.11.2019

The fan sold under continue reading "fantastic fan" name used for RV vents has the most air movement for the money but they aren't cheap. I have found that panels over watts usually are a higher voltage used in multiples for home or commercial use. View at: Google Scholar B.

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Re: azm solar powered greenhouse exhaust fan

Postby Tokazahn В» 16.11.2019

No customer reviews. Our employees Our team consist of employees. Advantages of wind roof ventilator Commercial and residential buildings, regardless of their sizes, cant avoid a problem--air quality. Like Save. Anyone think of roman air conditioning?

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Re: azm solar powered greenhouse exhaust fan

Postby Monris В» 16.11.2019

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Re: azm solar powered greenhouse exhaust fan

Postby Naktilar В» 16.11.2019

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Re: azm solar powered greenhouse exhaust fan

Postby Kagasida В» 16.11.2019

Supplier Types Trade Assurance. The solar radiation values obtained for 10 days in the http://gettedemou.tk/shop/7th-heaven-cake-shop-darbhanga.php of July. Oliveira, A. Since air conditioning systems have been introduced, they became part of daily life in many areas.

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Re: azm solar powered greenhouse exhaust fan

Postby Taum В» 16.11.2019

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Re: azm solar powered greenhouse exhaust fan

Postby Tecage В» 16.11.2019

Of course if you are on a low salt diet their milk might not make your Doctor happy. Table messages hard loofah sponge apologise. I have bothnot by choice but by a bad e-bay seller, and the 15 watters are intended as portable auto battery chargers with a plastic frame that I think will deteriorate too quickly and a small pre-wired connection not intended for permanent installation. Thus new technologies become necessary grreenhouse develop an efficient, low cost, environmentally friendly system that is capable of reducing the temperature using low cost components that are easy to run and maintain and flexible to be utilized [ 14 ].

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