scholarly journals CFD MODELLING AND VALIDATION OF AMBIENT FACTORS IN EVAPORATIVE COLD STORE FOR PEACH STORAGE

2022 ◽  
Vol 52 (1) ◽  
pp. 55-60
Author(s):  
Serap Akdemir
Keyword(s):  
Relative Humidity ◽  
Ambient Temperature ◽  
Relative Error ◽  
Storage Temperature ◽  
Cooling System ◽  
Cfd Modelling ◽  
Acceptable Error ◽  
Cfd Models ◽  
Evaporative Cooling System ◽  
Cold Store

Spatial variation of temperature and relative humidity were estimated with Computational Fluid Dynamics (CFD) at top, middle and base levels for peach storage at +1oC and 90% relative humidity and verified with measured data in a cold store with evaporative cooling system. Storage temperature was +1oC and relative humidity 90% for peach storage. Ansys Fluent Software was used for CFD modelling. CFD models were validated with sensors measurements. Results were evaluated by using descriptive statistics, relative error and variance analyses. Mean difference between the model and measurements was calculated as 0.51oC for ambient temperature and as 3.47 % for relative humidity. Relative error of the CFD model was calculated as 9.77 for the ambient temperature and 1.29 for relative humidity for peach storage. The developed CFD models estimated the ambient factors with an acceptable error in the evaporative cold store for peach storage.

scholarly journals DESIGN, CONSTRUCTION AND TESTING OF A COLD STORE WITH WATER-COOLED CHILLER

2022 ◽  
Vol 52 (1) ◽  
pp. 21-26
Author(s):  
Serap Akdemir
Keyword(s):  
Standard Deviation ◽  
Relative Humidity ◽  
Ambient Temperature ◽  
Heat Load ◽  
Cooling System ◽  
Descriptive Statistics ◽  
Air Velocity ◽  
Cold Store ◽  
Different Levels ◽  
Design Construction

Objective of this research was to design, construction and test of a cold store with chiller unit. Dimensions of the cold store were 5x4x3m. Heat load was calculated and capacity of cooling system was determined. Ambient temperature was set 2oC and relative humidity 90% for cold store testing. Ambient temperature, relative humidity and air velocity were measured for 3 different levels and 12 points for each level in the cold store. Total heat load and capacity of cooling system were calculated 5222 kcal/h. and 6.07 kW respectively.  The descriptive statistics  were calculated for the ambient temperature;  mean, 2.82oC, standard deviation 0.02oC and CV(%) 0.56, and  for the relative humidity; mean 88.01%, standard deviation 0.61 (%) and CV(%)  0.70 and for the air velocity mean 0.37m/s, standard deviation 0.22 m/s, CV 33.45 %. Even the air velocity CV was high, the ambient temperature and relative humidity variations were evaluated very good.

scholarly journals Geostatistics applied to swine facilities equipped with evaporative cooling system

2016 ◽  
Vol 20 (11) ◽  
pp. 1014-1019
Author(s):  
Paulo G. de Abreu ◽  
Osmar A. Dalla Costa ◽  
Vivian Feddern ◽  
Nelson Morés ◽  
Arlei Coldebella ◽  
...  
Keyword(s):  
Weight Gain ◽  
Relative Humidity ◽  
Cooling System ◽  
Thermal Conditions ◽  
Daily Weight Gain ◽  
Feed Conversion ◽  
Evaporative Cooling System ◽  
Air Cooler ◽  
Lower Temperature ◽  
Outer Perimeter

ABSTRACT The purpose of this study was to evaluate the spatial variation of temperature, relative humidity and black globe humidity temperature (BGHT) index in growing-finishing swine facilities, with and without evaporative air cooler. The experiment was conducted in a 60 x 9 m facility containing 32 pens of 3.20 x 4.00 m each, divided into two sectors. The treatments were without evaporative air cooler (control) and with evaporative air cooler. Temperature and relative humidity data were collected weekly in two periods (morning and afternoon) at 32 different sampling points, encompassing the center of each pen and the outer perimeter of the facility. Animal performance variables were: feed intake, feed conversion, weight out of the nursery, slaughter weight, weight gain and daily weight gain. According to the results, the analyzed variables showed spatial dependence, with lower temperature and higher relative humidity in the evaporative air cooler environment. However, evaporative air cooler system provided better environment thermal conditions inside the facilities, lowering BGHT values, which were lower in the adiabatic cooling sector. Although thermal conditions were better in the air cooler environment, swine performance was not affected.

scholarly journals Numerical investigations of solar-assisted hybrid desiccant evaporative cooling system for hot and humid climate

2020 ◽  
Vol 12 (6) ◽  
pp. 168781402093499
Author(s):  
Shafqat Hussain ◽  
Abdulrahim Kalendar ◽  
Muhammad Zeeshan Rafique ◽  
Patrick Oosthuizen
Keyword(s):  
Relative Humidity ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Ambient Air ◽  
Coefficient Of Performance ◽  
Cooling Load ◽  
Vapor Compression ◽  
Humid Climate ◽  
Numerical Investigations ◽  
Evaporative Cooling System

This article presents numerical investigations of the solar-assisted hybrid desiccant evaporative cooling system integrated with standard air collectors for applications under the hot and humid climatic conditions of Kuwait city. The objective is to introduce the energy-efficient and carbon-free solar-assisted hybrid desiccant evaporative cooling system to alleviate the principal problems of electricity consumption and carbon emissions resulting from the use of the conventional vapor-compression cooling systems. In the normal building, during cooling load operation, the solar-assisted hybrid desiccant evaporative cooling system can cope with the cooling load particularly sensible by evaporative cooling and latent through desiccant dehumidification. The outcomes of this work indicate that solar-assisted hybrid desiccant evaporative cooling device integrated with air collectors is capable of providing average coefficient of performance of 0.85 and has the potential to provide cooling with energy saving when compared with conventional vapor-compression refrigeration systems. It was concluded that under the intense outdoor environmental conditions (ambient air at greater than 45°C and 60% relative humidity), the delivered supply air from the evaporative cooling was nearly at 27°C and 65% relative humidity. To solve this problem, the system was assisted with conventional cooling coil (evaporator of heat pump) to supply air at comfortable conditions in the conditioned space.

scholarly journals EFFECT OF POT IN POT COOLING SYSTEM ON THE STORAGE LIFE OF OKRA (ABELMOSCHUS ESCULENTUS)

2020 ◽  
Vol 5 (5) ◽  
pp. 124-127
Author(s):  
Olaifa Peter ◽  
Oyedele O.J. ◽  
Bolaji O.B. ◽  
Shittu L.L
Keyword(s):  
Relative Humidity ◽  
Cooling System ◽  
Physical Phenomenon ◽  
Extensive Literature ◽  
Measuring Devices ◽  
River Bed ◽  
Evaporative Cooling System ◽  
The Mean ◽  
Evaporative Cooler ◽  
Clay Pots

Evaporative cooling system is a physical phenomenon in which the surrounding air cools an object or a liquid in contact with it. An extensive literature has been reviewed. The materials and methods used in the research involves, the two clay pots (bigger and smaller size), water, Okra, measuring devices (Thermometer and Hygrometer), and the wooden cover. A smaller pot was kept inside a bigger clay pot and the Inter-space was filled with river-bed sand which was made moist by adding water thrice a day i.e. morning, afternoon and evening. The result obtained showed that the okra can be stored for 14days in the mean temperature of (27.27, 32.92 and 29.68 OC) and relative humidity of (97.43, 47.08 and 66.30 %). Conclusively, the pot in pot evaporative cooler could be used in New Bussa, Nigeria during the dry season when the temperature is high and relative humidity is low.

scholarly journals Experimental Investigation of Thermal Performance of Aluminum Foil Coated with Polyester in a Direct Evaporative Cooling System

2021 ◽  
Vol 27 (4) ◽  
pp. 1-15
Author(s):  
Abbas Magid Taleb ◽  
Mohammed Abdulraouf Nima
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Relative Humidity ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Aluminum Foil ◽  
Adiabatic Process ◽  
Direct Evaporative Cooling ◽  
Evaporative Cooling System ◽  
Positive Impression

An experimental study was carried out for an evaporative cooling system in order to investigate the effect of using an aluminum pad coated with fabric polyester. In the present work, it was considered to use a new different type of cooling medium and test its performance during the change in the wet-bulb temperature and dry-bulb temperature of the supply air outside of the pad, the relative humidity of the supply air, the amount of air supplied (300-600) CFM and also the change of the amount of circulated water (1.75, 2.5, 4.5) liter per minute. A decrease in the WBT of the air was obtained, whereas the WBT of the air entering the pad was 26.5 . In contrast, the WBT of the outside air had reached 23  even though evaporative cooling is an adiabatic process which makes the WBT of the air that comes out of the pad is equal to the entering air WBT. The decrease in DBT is by changing the amount of air and water passing through the aluminum pad, whereas the DBT of the air entering the pad was 45 , while the DBT of the outside air had reached 29 . Also, an essential thing was obtained as this rise in the relative humidity of the air is very small 57%RH compared to the conventional pads, and this gives a positive impression as the air supplied from this pad has less moisture and its ability to carry moisture is much higher than that of air supplied from other pads. This gives a positive impression because the air supplied from this pad has lower humidity and its ability to hold moisture much higher than the air supplied from other traditional pads.

scholarly journals Energy-Based Performance Analysis of a Sustainable Farming Compartment with Evaporative Cooling System

2018 ◽  
Author(s):  
M. Sina Mousavi ◽  
Siamak Mirfendereski ◽  
Jae Sung Park ◽  
Jongwan Eun
Keyword(s):  
Relative Humidity ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Experimental Results ◽  
Treated Wastewater ◽  
Total Power ◽  
Field Site ◽  
Sustainable Farming ◽  
Total Power Consumption ◽  
Evaporative Cooling System

The United Arab Emirates (UAE) is significantly dependent on desalinated water and groundwater resource, which is expensive and highly energy intensive. Despite the scarce water resource, only 54% of the recycled water was reused in 2015. In this study, an “Oasis” complex comprised of Sustainable Farming Compartments (SFCs) was proposed for reusing treated wastewater to decrease the ambient temperature of the SFC via an evaporative cooling system. A prototype SFC with half the original scale (width = 1.8 m, depth = 1.5 m, front height = 1.2 m back height = 0.9 m) was designed, built, and tested in an environmentally controlled laboratory and field site to evaluate the feasibility and effectiveness of the SFC under the climatic conditions in Abu Dhabi. Based on the experimental results, the temperature drops obtained from the SFC in the laboratory and field site were 5 ̊C at initial relative humidity of 60% and 7- 15 ̊C at initial relative humidity of 50%, respectively. An energy simulation using dynamic numerical simulations was performed in comparison to the results of the experiment. The energy-based dynamic simulation shows good agreement with the experimental results. The total power consumption of the SFC system was approximately three and a half times lower than that of an electrical air conditioner.

Experimental Study on Effect of Meteorologic Parameters on Evaporative Cooling System Performance

2014 ◽  
Vol 1070-1072 ◽  
pp. 1998-2001
Author(s):  
Xiao Feng Zhou ◽  
Xiao Ping Miao ◽  
Jun Yang ◽  
Feng Jiang
Keyword(s):  
Energy Consumption ◽  
Relative Humidity ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Real Data ◽  
Linear Quadratic ◽  
Consumption Ratio ◽  
Quadratic Surface ◽  
Evaporative Cooling System ◽  
Energy Consumption Ratio

Based on experimental platform of the evaporative cooling system and a large number of experimental data, the influence of air relative humidity and dry bulb temperature on the energy consumption ratio (ECR) of the evaporative condenser is studied. Resorting to the test data, linear, quadratic and cubic fitting surfaces are used to get the function of energy consumption ratio with two variables, dry bulb temperature and relative humidity. The fitting and validation results show that the quadratic surface approaches the real data best among the three manners.

Design, Construction, and Performance Evaluation of an Evaporative Cooling System for Tomatoes Storage

2020 ◽  
Vol 24 (4) ◽  
pp. 1-12
Author(s):  
Edward A. Awafo ◽  
Samuel Nketsiah ◽  
Mumin Alhassan ◽  
Ebenezer Appiah-Kubi
Keyword(s):  
Relative Humidity ◽  
Cooling System ◽  
Storage System ◽  
Evaporative Cooling ◽  
Ambient Conditions ◽  
Data Logger ◽  
Significant Difference ◽  
Jute Sack ◽  
Tomato Processing ◽  
Evaporative Cooling System

AbstractAn evaporative cooling system was designed and constructed to increase the shelf life of stored vegetables. The evaporative cooler was tested and evaluated using freshly harvested roma tomatoes. The equipment operates on the principle of evaporative cooling which increased the relative humidity and decreased temperature in the preservation chamber. The storage system was made up of wood of 25.4 mm thickness. A side of the system is made of jute sack, which was moistened with water flowing through a series of perforated pipes from a reservoir located at the top of the storage system. The water flowed under gravity. The relative humidity and temperature of the tomatoes were analyzed using tinytag humidity, temperature data logger. The weight loss of the tomatoes was also analyzed using a dial gauge scale. The results revealed that there was significant difference in using the evaporative cooling system for storing tomatoes as compared to ambient conditions. The average cooling efficiency was found to be 81%. The average temperature achieved in the cooling system dropped to an average of 23℃ when compared to the average ambient temperature of 33℃, and the relative humidity also increased up to 99% when compared to the average ambient of 59%. The analysis of the evaporative cooling system showed that tomatoes can be stored for more than 6 days with negligible changes in weight, colour and firmness as compared to those under ambient condition, which deteriorated after day 3. The evaporative cooling system was found to be effective and hence can be used by farmers, households, and tomato processing factories for short term storage of fresh tomatoes.

scholarly journals A Numerical Analysis of the Cooling Performance of a Hybrid Personal Cooling System (HPCS): Effects of Ambient Temperature and Relative Humidity

2020 ◽  
Vol 17 (14) ◽  
pp. 4995
Author(s):  
Pengjun Xu ◽  
Zhanxiao Kang ◽  
Faming Wang ◽  
Udayraj Udayraj
Keyword(s):  
Numerical Analysis ◽  
Relative Humidity ◽  
Ambient Temperature ◽  
Thermal Performance ◽  
Environmental Temperature ◽  
Cooling System ◽  
Cooling Performance ◽  
Hot Environment ◽  
Four Levels ◽  
Personal Cooling

Hybrid personal cooling systems (HPCS) incorporated with ventilation fans and phase change materials (PCMs) have shown its superior capability for mitigating workers’ heat strain while performing heavy labor work in hot environments. In a previous study, the effects of thermal resistance of insulation pads, and latent heat and melting temperature of PCMs on the HPCS’s thermal performance have been investigated. In addition to the aforementioned factors, environmental conditions, i.e., ambient temperature and relative humidity, also significantly affect the thermal performance of the HPCS. In this paper, a numerical parametric study was performed to investigate the effects of the environmental temperature and relative humidity (RH) on the thermal management of the HPCS. Five levels of air temperature under RH = 50% (i.e., 32, 34, 36, 38 and 40 °C) and four levels of environmental RH at two ambient temperatures of 36 and 40 °C were selected (i.e., RH = 30, 50, 70 and 90%) for the numerical analysis. Results show that high environmental temperatures could accelerate the PCM melting process and thereby weaken the cooling performance of HPCS. In the moderately hot environment (36 °C), HPCS presented good cooling performance with the maximum core temperature at around 37.5 °C during excise when the ambient RH ≤ 70%, whereas good cooling performance could be only seen under RH ≤ 50% in the extremely hot environment (40 °C). Thus, it may be concluded that the maximum environmental RH under which the HPCS exhibiting good cooling performance decreases with an increase in the environmental temperature.

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