Perforated Pipe Research Articles

Efficiency of cavity dissolution in rock salt by water submerged jets

To create cavities when dissolving rock salt, it is most expedient to supply the solvent through the nozzles of a perforated pipe in the form of submerged jets. This article examines the physical dissolution of a cavity with water from a stationary nozzle with a diameter of 0.004 m at two constant velocities at the nozzle cross-section. The efficiency of cavity dissolution, which has an almost cylindrical shape with a semi-cylindrical bottom, was analyzed at a nozzle cross-section speed of 8.85 m/s. The obtained results are explained on the basis of the fact that the formed cavity is a short dead-end channel where longitudinal compression acts. The flow in such a channel is caused by the back pressure exerted by its end. And the back pressure, in turn, hinders the development of the jet that flows out of the stationary nozzle, limiting its range. The cessation of significant expansion of the jet is indirectly confirmed by the use of an empirical formula for the distribution of the maximum water velocity along the axis of the jet. Its value at the end of the section of the most intense dissolution of the cavity becomes 8.85 times smaller compared to the speed at the nozzle cross-section. The boundaries of the area of the most intense dissolution of the cavity are determined by the relationship between the depth of the cavity, the diameter of the nozzle, the velocity at its cross-section, and the time of dissolution, which can be used to model the dissolution of cavities at different values of the velocity at the cross-section of the nozzle at its constant diameter. It was found that the relationship between the radius and depth of the cavity is linear. The angle between the boundary of the cavity size change and the axis of the nozzle is 20°23'. These results show that the dissolution of cavities is effective in a limited range of their dissolution time, the limits of which depend on the velocity of the solvent at the nozzle section. To confirm the obtained results, it is necessary to investigate the geometric characteristics of the cavities for other values of the nozzle diameters.

Assessing the value of the hydraulic friction factor in pipelines working with a flow connection along the path

The results of an experimental study of the hydraulic friction factor of perforated pipelines that work with the collection of fluid along the path are reported. Clarification of this issue will make it possible to solve an important engineering task – to devise a reliable procedure for the hydraulic calculation of perforated pipes. The experiments were carried out on an assembled experimental bench. A steel pipeline with a perforated part of 1–3 m was investigated. Perforation holes were taken with a diameter of 3.6 and 9 mm. In the experiments, fluid flow, pressure loss, and average velocity were measured. Based on the data obtained, the values of the coefficient under study were calculated. It has been established that it is significantly larger than its values with uniform movement and is variable in length of the pipeline. Experimental dependences λcol on the value of the ratio of the velocities of the flowing jets of liquid to the average flow velocity in the corresponding section (Uh/V), as well as on the design characteristics of the channel, were obtained. It is shown that the lower value of the degree of pipe perforation corresponds to the higher values of λcol. This result can be explained by the influence of the attached flow rate on the main flow. The confirmation of this conclusion is the resulting shapes of diagrams of the average flow velocity obtained in the experiments, which differ significantly from standard diagrams with uniform motion. Obviously, additional energy is spent on the reformation of the velocities, and this causes additional head losses. Dependences were obtained for calculating the considered coefficient for prefabricated pipelines, including in the presence of transit flow rate. Their use in the calculation of the pipes under consideration will increase the reliability and efficiency of the sewage treatment plant, in which they are important structural elements

Study on Interaction Mechanism of Natural Gas Pipe-Landslide System Reinforced by Micropile Groups Based on Model Test

Natural gas pipeline projects in mountainous areas are inevitably affected by geological disasters such as landslides, which pose a serious threat to the safe operation of pipelines along the routes crossing landslide areas. In this paper, based on a pipe-landslide project in a mountainous area in southwest China, the interaction mechanism and failure evolution process of the landslide-pipeline system reinforced by two kinds of micropiles are studied through indoor large-scale physical model tests, and some suggestions on the support work of the pipe-landslide project are put forward according to the test results. It was found that the deformation process of the engineering system composed of landslide, micropile, and pipeline presents a high degree of synergy under the external force and mainly experiences four stages: initial deformation period, uniform deformation period, accelerated deformation period, and residual deformation period. The bending deformation of the perforated pipe micropile is large at the 1/4 position of the pile top from the pile bottom, and the deformation of the screw micropile near the sliding surface is serious. The pipeline welding port is the weak position of the pipeline; after the failure of the pile, the pipeline interface is first cracked, along the interface position along the two ends of the tear, and finally completely broken. The screw micropile cannot effectively resist the landslide thrust at a large load level, so the risk of pipeline damage is greater. The yield strength and ultimate strength of the perforated pipe micropile are greater than those of the screw micropile, and the perforated pipe micropile can still exert a certain residual resistance after reaching the ultimate bearing capacity, which has a beneficial effect on the reinforcement of the pipeline crossing the landslide system. The research results provide important reference value for landslide-pipeline treatment engineering.

Bir Dizel Jeneratörde Artan Motor Yükünün Egzoz Geri Basıncı Üzerindeki Etkisinin Sayısal ve Deneysel İncelenmesi

In this study, the exhaust back pressure (EBP) behavior resulting from the gradual increase in engine load of the exhaust muffler system used in a diesel engine generator was investigated numerically and experimentally. By examining the compatibility of numerical analysis and experimental test exhaust back pressure results with each other, the possibility of eliminating the need for experimental exhaust back pressure test is examined. Firstly, the exhaust gas temperature and flow rate of the selected diesel engine under five different engine loads were experimentally measured. A reactive muffler with perforated pipe, designed to be integrated into the selected engine, was subjected to computational fluid dynamics (CFD) analyzes using measured exhaust gas temperature and gas flow rate. Numerical EBP values were obtained with these numerical analysis studies, which were carried out using the finite volume method in the ANSYS-Fluent program. Finally, the exhaust silencer system, which was manufactured, was subjected to experimental EBP tests under five different engine loads that were gradually increased. According to the numerical and experimental EBP results obtained, it has been observed that the gradual engine load increase in a diesel generator increases the EBP as parabolic. It was understood that the numerical and experimental results of the EBP for different load conditions became more compatible as the engine load increased, and the numerical analysis error rate was found as 4.06% under the 110% engine load which is the critical load condition. In addition, it was concluded that the need for experimental EBP tests can be eliminated by using only numerical studies in the generator exhaust muffler design.

Investigating the similarities and differences between front and back surface cooling for PV panels

There has been a rise in the use of alternative energy sources around the world, and solar photovoltaic (PV) electricity has gained a lot of popularity. However, the PV module's electrical efficiency decreases as its temperature increases, making it critical to find ways to boost the module's performance at high temperatures. The panel's output, efficiency, performance, and longevity all suffer as a result of the increased temperature caused by the sun's absorption. Using cooling devices to reduce cell temperature is one way to keep PV panels from overheating and damaging their performance. An essential operational consideration for solar photovoltaic systems is maintaining a cool working surface to maximize efficiency. Keeping solar modules at the right temperature might increase their useful life lifetime. The discarded heat from the cooling system has numerous potential uses in the residential, commercial, and industrial sectors. Experiments were performed to determine the impact that surface cooling from either the front or the back had on the output performance of a PV array. Water flow at a specific mass rate was utilized to cool the front exterior of the PV system, while wet grass (dry grass with water supply) was used to cool the back surface in back surface cooling. Because of this, the perforated pipe is situated so that water from the tank can flow out of the panel on both of its front faces. The average temperature drop for the experiment was found to be 21.23°. The outcome was a 28.6 percent boost in the panel's power output. The cooled PV module has an average efficiency of 34.96 percent. Both cooling approaches worked well, however the recommended front surface cooling approach had a far more noticeable and beneficial outcome on the energy output of the PV panel.

Extending the Validity of Basic Equations for One-dimensional Flow in Tubes with Distributed Mass Sources and Varying Cross Sections

Flow problems are solved using so-called fundamental equations and the corresponding initial and boundary conditions. The fundamental equations are the motion equation, the continuity equation, the energy conservation equation, and the state equations. In our paper, we extend the validity of the equation of motion used to describe one-dimensional, steady-state tubular flow to a case in which the mass flow of the medium changes along the tubular axis during the flow. Such flows occur in perforated and/or porous pipes and air ducts. The research in this direction was motivated by the fact that the extension and formulation of the equation of motion in this direction has not been carried out with completely general validity. In the equation of motion used to solve the problems, the isochoric and isotherm nature were assumed. In our paper, we present fundamental equations that formulate differential equations to describe polytrophic and expanding flows.

An experimental study of flow-induced noise from perforated pipes

An experimental study was performed to understand the generated flow noise by perforated pipes inside of concentric tube resonators. Six perforated pipes with 2% to 45% open areas and hole diameters ranging from 0.8 mm to 4.65 mm are considered. The six concentric tube resonators are compared to a straight pipe and a simple expansion chamber. All cases are tested at ten flow velocities ranging from 0.1 Mach to 0.28 Mach with a 0.02 Mach increment. The effect of the hole diameter and perforation rate on the noise generation and the overall level of the radiated noise is examined. It is found that the whistle frequency is inversely proportional to the hole diameter and proportional to the flow velocity. The amplitude of the generated flow noise is proportional to the perforation rate. Finally, an insertion loss method is used to demonstrate that minimizing the hole diameter and perforation rate decreases the generated flow noise.

Numerical study on the influence of porous baffle interface and mesh typology on the silencer flow analysis

The study of the internal component geometries (i.e. perforated elements) is relevant for the acoustic performance optimisation of a silencer. During the design phase, the evaluation of the properties of a silencer is performed by numerical analysis. In the literature, there is a lack of general guidelines and comparisons among different modelling strategies. So, in this study, the influence of grid type (i.e. trimmed vs tetrahedral) on the numerical prediction of the flow inside a reactive silencer is analysed. Moreover, using a porous baffle interface to model the perforated pipe is investigated, searching for a faster and easier way to model perforated elements. The simulations are carried out with the commercial CFD software STAR-CCM+. The comparison of the obtained axial velocity with a literature case study assesses the numerical model reliability. The analysis highlights that velocity and pressure predicted with both the mesh typologies does not significantly differ, but the trimmed mesh allows to save cells number, reducing the computational cost. Instead, obtain a reliable flow description using the porous baffle interface is strictly correlated to the settings of the resistance coefficient. This assumption does not provide accurate results for the analysed perforated pipe. On the other hand, using a simplified model allows to easily perform a comparison between different muffler geometries, as the holes have not to be drowned and meshed after each modification.

Enhancement of the electrokinetic removal of heavy metals, cations, anions, and other elements from soil by integrating PCPSS and a chelating agent

BackgroundRecently, we have developed a new soil electrokinetic remediation (SEKR) process, hereinafter referred to as the perforated cathode pipe SEKR system (PCPSS), to achieve remediation intensification. Some obstacles, such as the low removal of some heavy metals, particularly Ni, limited our previous PCPCS. MethodsWe aim to improve the removal efficiency of the PCPSS by adding a chelating agent (i.e., ethylenediaminetetraacetic acid (EDTA)). Given the unsatisfactory remediation results obtained in our previous studies, the Taguchi approach (L9OA) was exploited in this work as an experimental design to determine the optimal level of factors that could enhance Ni removal. Significant findingsResults showed that an electric potential of 3 V, addition of 0.5 mol of EDTA, and an initial Ni concentration in the range of 10–20 mg kg−1 could optimize Ni removal. Confirmation experiments conducted on natural contaminated soil showed the following order of removal of heavy metals and other elements: Al (70%) > Co (69%) > Fe (63.5%) > Cu (55%) > Mn (52.8%) > Zn (43.17%) > Cr (41.41%) > Ni (22.26%). Among the studied soil cations, Mg showed the best removal rate, Ba showed moderate removal rate, and Ca showed the lowest removal rate. Notably, the removal rate of V was much higher than that of born (B).

Simple Physical Process Can Slow Down the Progression of Cancer

If a liquid contains suspended solids and flows out of a perforated pipe, the suspended particles of the right size can accumulate and eventually clog the openings. It is suggested that this physical process could be employed to effectively block the openings of the intercellular gaps in angiogenic capillaries supplying cancer tissues. Clogging the big openings supplying cancer tissues would reduce the nutrition supply, resulting in deprivation. This process predictively could slow down the tumor progression. If the proposed physical process is effective, then societies that drink water containing colloidal-size particles should have fewer occurrences of cancer. Epidemiological data is consistent with this prediction and shows an inverse correlation between the total dissolved solid concentrations in drinking water and the incidence of cancer. The effectiveness of the proposed physical process was tested in a pilot project on six rats. Four of them had suspended kaolinite minerals in the drinking water, and two of them got regular tap water. All the treated rats developed smaller tumors than the untreated control group of two. The average weight of the developed tumors was 42 percent less in the treated group. Doi: 10.28991/SciMedJ-2022-0401-4 Full Text: PDF

A pilot system integrating a settling technique and a horizontal subsurface flow constructed wetland for the treatment of polluted lake water

An integrated system was tested at pilot-scale for treating polluted water from the Marriot Lake in Egypt, comprising a settling technique followed by three parallel horizontal subsurface flow constructed wetland (HFCWs) units operating under a continuous flow mode; one HFCW unit was planted with Typha angustifolia and contained a perforated pipes network for enhanced passive aeration (CWA), one unit was planted without the perforated pipe network (CWR) and one served as a Control unit (unplanted and without perforated pipes). Changes in physicochemical parameters, BOD5, nutrients (nitrogen, phosphorus), microbial community, and trace metals at different hydraulic retention times (HRT; 0.5–6 h) and hydraulic loading rates (HLR; 750, 1000, 1250, and 2000 L/m2/d) were monitored. The CWA unit had an overall better performance than the CWR unit, while both planted units outperformed the Control unit. CWA showed the highest performance at HLR of 1000 L/m2/d and 4-6 h-HRT with 95.3% removal for turbidity, 83% for BOD5, 99.3% for ammonia nitrogen (NH4–N), 70.8% for Total Nitrogen (TN), and 66.7% for Total Phosphorus (TP), while higher NO3–N and NO2–N effluent concentrations were observed. Trace metals levels were significantly reduced and accumulated in plant tissues. Microbial communities’ densities fluctuated in the CWA unit. The integrated system with the settling stage and the planted CWA unit was proved to achieve a high removal efficiency and reached the national discharge limits, thus representing a novel nature-based solution for the sustainable remediation of polluted lake water.

Load Capacity of Perforated Reinforced Concrete Sewer Pipes

In cities, reinforced concrete pipes are often employed to construct storm sewer systems. Due to impervious base layers, stormwater runoff dominates rather than rainwater infiltration, leading to problems in aquatic ecosystems (e.g., degradation in urban watersheds, flood attenuation, and water quality). A thermoplastic perforated pipe can provide drainage channels in applications of solid waste landfills, mining heap leach pads, or irrigation systems. Inspired by these applications, perforation can be implemented in a reinforced concrete sewer to alter the moisture conditions in the ground under impervious base layers. Three-edge bearing tests and four-point flexural tests are conducted to investigate the structural integrity of perforated sewer pipes. A numerical model is also calibrated for use to optimize the layout design of drainage holes. It is found that perforation can result in strength degradation in concrete pipe, but the reduction in strength is not significant. A correlation between the ultimate load and opening ratio is established for the two testing conditions. The allowable opening ratio is determined as 0.2%, below which a perforated sewer can fulfill the requirements for both drainage and load resistance.

Cooling Potential of Bin Stored Wheat by Summer and Autumn Aeration

A one-dimensional mathematical model based on the formulation of mass and energy balance in stored grain was used to simulate grains storage conditions. The objective of such simulations was to produce grain ventilation strategies. The model was validated using data obtained from the monitoring of wheat stored in a galvanized steel cylindrical tank with corrugated conical bottom ventilated by perforated distribution pipes. A control strategy based on night time aeration from July to November followed by day time aeration for December to January was applied. Good agreement between the predicted and measured storage conditions has been observed (R2= 0.9698, S.E.= 1.479 °C in average temperature and R2= 0.99, S.E.= 0.00079 kg kg-1for moisture content). Night time grain aeration provided sufficient cooling (temperature near 10 °C in November). However, an 18% grain humidification process was induced. Day time aeration started at the end of November corrected this humidification effect for a grain temperature of 15 °C and a grain moisture content of 15% on dry basis.

The assessment of rill irrigation and perforated pipes for Lowland paddy rice under the system of rice intensification (SRI)

The assessment of rill irrigation and perforated pipes for Lowland paddy rice under the system of rice intensification (SRI)

Tracking the hydrologic response of agricultural tile outlet terraces to storm events

Agricultural practices in intensively managed landscapes are thought to be shifting hydro-bio-geochemical behavior from transformation to transport dominated systems. Here we explore the impacts of a best management practice known as tile-outlet-terraces (TOT). Tiles at this site are a set of perforated vertical pipes that can receive direct surface water, soil water and groundwater inputs that are connected to horizontal pipes that transport water to a receiving pond. Terraces are constructed, horizontal areas created to divide sloping terrains to reduce slope steepness and erosion, and in so doing they redirect surface water toward standpipes and promote soil and groundwater discharge as a result bisecting local flowpaths. While the impact of tiles on hydrologic behavior has been well studied, the combined impact of TOTs has not been well quantified. To address this knowledge gap, we focus on the response of TOT discharge and biogeochemical behavior across three adjacent agroecosystems in Kansas over three growing seasons (2016–2018). TOT discharge was measured every minute at each location and discharge during storm events was collected and analyzed for dissolved and total nutrients as well as major anion and cation chemistry. Additionally, suction cup lysimeters were installed at the ridges and depression of the terraces to capture soil water solute chemistry prior to storm events. Recession curve analysis revealed that tile inlet density was not directly related to the proportion of quickflow, mixing models showed that antecedent conditions played a critical role in the degree of connectivity of event water to the tiles, and concentration discharge behavior showed the dominant behavior for all constituents was chemostatic across all tile densities. Interestingly, these findings suggest that while TOTs shift the hydrology of agroecosystems away from natural conditions, the storm event size and antecedent conditions can still dominate the hydrologic and biogeochemical response to storm events.

Influence of Subsurface Pipe Perforations on Transient Water Table Response and Steady Soil-Water Flux under Subirrigation

HighlightsWater table rise was slower under a sparsely perforated pipe as compared to a pipe that was densely perforated.Response time increased as buried pipe depth decreased for both combinations of perforation characteristics.Fluxes from buried pipes spaced at 15 m in loamy sand satisfied the water demand for cereal/grain crops (6 mm d-1).Increasing perforation density on the pipe wall is the most effective way to reduce exit head losses.Abstract. It is important to consider the water table rise into the unsaturated zone when designing subsurface irrigation systems that consist of buried perforated corrugated pipes. Corrections to pipe spacing equations for head losses due to perforations are based on the entrance resistance, which is derived for buried pipes operating in drainage mode. However, the boundary condition at the soil-pipe interface when operated in subsurface irrigation mode requires the use of the exit resistance to accurately account for perforations in the pipe wall. Simulations of a subsurface irrigation system with four soil textures, three lateral pipe spacings, and three buried depths were carried out, with the numerical model COMSOL, to demonstrate the effects of variable perforation characteristics on the transient water table rise into the unsaturated zone. Soil-water fluxes were also computed for the system when operated under steady-state conditions. The simulated water table rise exceeded or approached a predetermined target water level of 1.65 m above the buried pipes in coarse-textured soils (loamy sands and silt loams) with lateral pipe spacings as large as 10 m. Increasing the number and length of rectangular slots in the pipe wall (densely perforated) can reduce the water table response time to reach the target level by 15 h in a silt loam soil and 25 h in a clay soil. The optimum pipe spacing needed to sustain a soil-water flux of 6 mm d-1 (common to eastern Canada and the U.S. Midwest) can be increased from 15.1 to 16.2 m in loamy sands by using densely perforated pipes. In contrast, increasing perforations in pipes buried in clays and sandy clays will result in pipe spacing increases of less than 0.2 m because these fine-textured soils have lower hydraulic conductivity. This study has demonstrated that variable perforation characteristics can be included in the analysis and design of subsurface drainage systems for improving water management. Keywords: Corrugated perforated pipes, Exit resistance, Head loss, Subirrigation, Unsaturated zone, Water table response.

A review on acoustic performance analysis of reactive muffler

This paper highlights on acoustic performance analysis of different types of reactivemufflers. The performance of the muffler is measured in terms of insertion loss(IL), transmissionloss (TL), leveldifference (LD)or noise reduction (NR). The transmission loss (TL) is one of the important parametermostly used for acoustic performance analysis of muffler.The transmission loss of the muffler is determined with incident power by decomposition theory and transmitted power by plane wave approximation assuming anechoic termination. The exhaust noise generated by the vehicle must be within limit as prescribed by pollution control board norms to meet the customer expectations.The exhaust system noise makes a huge contribution to the exterior noise. To attenuate the noise generated from the vehicle different types of reactive muffler are used as per target frequency of engine.This paper presents a review on the acoustic performance of reactive muffler with simple expansion chamber-circular, elliptical&rectangular cross section, muffler with Extended Inlet and Extended outlet, conicalmuffler, muffler with perforated pipe, muffler with baffle plate, Plug muffler, Split stream rushing muffler and muffler with corrugated pipe.

Choice of Pipe Material Influences Drain Spacing and System Cost in Subsurface Drainage Design

HighlightsFor 3- or 4-row regular-perforated pipes, the effective radius ranged from 0.3 to 0.9 cm (average 0.6 cm).For 8-row regular-perforated pipes, the effective radius was 1.9 cm.The effective radius of sock-wrapped pipes ranged from 5.7 to 6.0 cm (average 5.9 cm).The 8-row sand-slot pipes had a lower initial system cost than the sock-wrapped pipes.The 8-row regular-perforated pipes had a lower initial system cost than the 4-row regular-perforated pipes.Abstract. Knitted-sock envelopes are applied in agricultural subsurface drainage to prevent sediment clogging of the drain pipes. In the United States and Canada, sand-slot pipes are sometimes used as a cheaper alternative to sock-wrapped pipes. However, their initial system cost has not been compared. The main objective of this study was to evaluate the effect of pipe material on drain spacing and initial system cost. First, the theoretical effective radius of each pipe material was estimated. Then, the drain spacing was calculated for each pipe material in a drainage design, such that each pipe would provide the same design drainage rate (i.e., same water removal rate). The results showed that the effective radius of sock-wrapped pipes (average 5.9 cm) was much greater than that of 4-row (average 0.4 cm) and 8-row perforated sand-slot pipes (average 1.6 cm). Rows refer to number of longitudinal rows of perforations. The sock-wrapped pipes considerably increased the effective radius of the pipe by reducing the entrance head loss. Furthermore, the sock-wrapped pipes allowed for a wider drain spacing (ranging from 0.8 to 5.4 m wider) in soil with risk of drain sedimentation, thereby reducing the total length of the lateral drain pipe needed for drainage design compared to both 4- and 8-row sand-slot pipes. The 8-row regular-perforated pipes allowed for a wider optimum drain spacing, thereby reducing the initial system cost in soil without a drain sedimentation issue compared to 4-row regular-perforated pipes. In conclusion, even though the sock-wrapped pipe reduced the total length of the lateral drain pipe, the 8-row sand-slot pipe had a lower initial system cost compared to the sock-wrapped pipe, when designed at the same design drainage rate and drain depth. Keywords: Drain spacing, Effective radius, Entrance resistance, Geotextile, Knitted sock, Perforation.

Case study: Numerical study of the noise reduction characteristics of corrugated perforated pipe mufflers

Resistant mufflers are commonly used in the wide band noise control of the exhaust of tractor internal combustion engines due to their simple structure, broadband frequency performance and long service life. In this paper, a corrugated perforated pipe muffler was proposed based on an improved design of a straight-through perforated pipe muffler to reduce the exhaust noise of internal combustion engines. The acoustic attenuation performance of the corrugated perforated tube muffler under the action of nonuniform flow and a temperature gradient was predicted by using the one-way flow-acoustic coupling method, which combines computational fluid dynamics and the acoustic finite element method. The pressure loss and self-noise of the corrugated perforated tube muffler were compared with those of the straight-through perforated tube muffler. The influence of the structural parameters of the corrugated perforated tube mufflers on the transmission loss was analyzed. The significance level of the perforation diameter, peak height, distance between adjacent peaks, and peak width on the transmission loss of the corrugated perforated tube muffler was studied by multiple linear regression analysis.

PERFORMANCE EVALUATION OF AN EVAPORATIVE CHARCOAL COOLER UTILIZING THIN-FILM PHOTOVOLTAIC SYSTEM FOR PRESERVATION OF AVOCADO

Fruits are high moisture agricultural produce rendering them highly perishable hence the danger of postharvest losses is also lurking when there are inadequate storage facilities. The losses result from physical, chemical, and physiological changes that are triggered by the loss in moisture content. Preservation of fruits using available and affordable technologies (such as charcoal coolers) can benefit small-scale farmers in minimizing postharvest losses. An evaporative charcoal cooler 4 m long, 4 m wide, and 2.5 m high providing a 40 m3 storage capacity was utilized in the study. The cooler with a 150 mm wide cavity filled with charcoal had a perforated pipe connected to a 1000-litrecistern raised at 2.5 m above the ground and connected to a water pump (Pedrollo PKm 60, Italy) that kept the charcoal wet by a drip system. The pump and the three axial fans (REC-21725 A2 W, USA) rated 180 cubic feet per minute (CFM) and 2600 revolutions per minute (RPM) were powered by fast fold thin-film PV (FFMAT-10, Renovagen, UK) system connected to a 10-kWh rated energy hub (FFENERGYHUB-10, Renovagen, UK). Temperature, relative humidity and product quality parameters (weight loss, total soluble solids, vitamin C content and firmness were evaluated).The evaporative cooler temperatures reduced significantly (P<0.05) with an average 25.0±0.37 oC and 32.1±0.99 ºC outdoors temperatures. The cooler relative humidity increased significantly (P˂0.05) averaging 76.8±1.6% and 43±2.8% for ambient conditions. The average cooling efficiency in the charcoal cooler was 83.0%.The percentage weight loss of the avocado was 3.9% and 7.5% for the cooler and outdoors respectively. The percentage vitamin C loss was 39.0% for the cooler and 49.6% for those kept outside. The total soluble solids in the cooler rose from 0.5 to 1.6 oBrix and 0.5 to 2.6 oBrix in ambient conditions. Firmness decreased from an average 65.0 N to 10.7 N and 65.0 N to 8.0 N after 12 days for samples in the cooler and ambient conditions, respectively. In conclusion, the evaporative charcoal cooler incorporated with thin-film PV system preserved the postharvest quality and extended the shelf life of hass avocado.