scholarly journals Experimentation and Simulation of a Small-Scale Adsorption Cooling System in Temperate Climate

2012 ◽  
Vol 30 ◽  
pp. 704-714 ◽  
Author(s):  
Sébastien Thomas ◽  
Samuel Hennaut ◽  
Stefan Maas ◽  
Philippe Andre
Keyword(s):  
Cooling System ◽  
Temperate Climate ◽  
Small Scale ◽  
Adsorption Cooling System

scholarly journals Numerical Investigation of Small-Scale Adsorption Cooling System Performance Employing Activated Carbon-Ethanol Pair

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1499 ◽  
Author(s):  
Marzia Khanam ◽  
Skander Jribi ◽  
Takahiko Miyazaki ◽  
Bidyut Saha ◽  
Shigeru Koyama
Keyword(s):  
Activated Carbon ◽  
Numerical Investigation ◽  
System Performance ◽  
Cooling System ◽  
Small Scale ◽  
Adsorption Cooling System

scholarly journals Simulation and Analysis of Small-Scale Solar Adsorption Cooling System for Cold Climate

2015 ◽  
Vol 6 (1) ◽  
pp. 54-60 ◽  
Author(s):  
Karolis Januševičius ◽  
◽  
Giedrė Streckienė ◽  
Violeta Misevičiūtė ◽  
◽  
...  
Keyword(s):  
Cooling System ◽  
Cold Climate ◽  
Small Scale ◽  
Adsorption Cooling System

Simultaneous Transport of Heat and Adsorbate in Closed Type Adsorption Cooling System Utilizing Solar Heat

1986 ◽  
Vol 108 (3) ◽  
pp. 239-245 ◽  
Author(s):  
A. Sakoda ◽  
M. Suzuki
Keyword(s):  
Cooling System ◽  
Adsorption Properties ◽  
Operating Conditions ◽  
Small Scale ◽  
Scale Unit ◽  
Closed Type ◽  
Quantitative Analyses ◽  
Solar Powered ◽  
Adsorption Cooling System ◽  
Model Structures

Quantitative analyses are tried for the simultaneous transport of heat and adsorbate in the operation of a closed-type solar-powered adsorption cooling system. Experimental results obtained with a small-scale unit are successfully interpreted by the model proposed here, which takes into account adsorption properties of a combination of adsorbate and adsorbent employed in the system, structures of the equipment, and its operating conditions. Also, the coefficient of performances of the system of various conditions are estimated by numerical simulations on the basis of the model. Structures of the container of adsorbents are optimized to provide larger COP.

Performance of a small-scale solar-powered adsorption cooling system

2017 ◽  
Vol 14 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Ahmed M. Reda ◽  
Ahmed Hamza H. Ali ◽  
Ibrahim S. Taha ◽  
Mahmoud G. Morsy
Keyword(s):  
Cooling System ◽  
Small Scale ◽  
Solar Powered ◽  
Adsorption Cooling System

scholarly journals Development and Evaluation of an Ultrasonic Humidifier to Control Humidity in a Cold Storage Room for Postharvest Quality Management of Dates

Foods ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 949
Author(s):  
Maged Mohammed ◽  
Nashi Alqahtani ◽  
Hamadttu El-Shafie
Keyword(s):  
Quality Management ◽  
Cold Storage ◽  
Cooling System ◽  
Positive Impact ◽  
Droplet Diameter ◽  
Postharvest Quality ◽  
Main Element ◽  
Small Scale ◽  
Storage Room ◽  
Ultrasonic Humidifier

Dates are subjected to postharvest losses in quality and quantity caused by water loss, fermentation, insect infestation, and microbial spoilage during storage. Cold storage is the main element in the postharvest quality management used for fruit preservation. Although cold storage is used for dates, precision control of the relative humidity (RH) using ultrasonic applications is not used thus far, or it is applied to other fruits on a small scale. Therefore, we designed and constructed an ultrasonic humidifier (DUH) for RH control in the cold storage room (CSR) of dates. The optimum air velocity of 3 m s−1 at the outlets of the DUH ducts produced a mist amount of 6.8 kg h-1 with an average droplet diameter of 4.26 ± 1.43 µm at the applied voltage of 48 V and frequency of 2600 kHz of the transducers. The experimental validation was carried out by comparing a CSR controlled with the DUH with two conventional CSRs. The three tested CSRs were similar in dimensions, cooling system, and amount of stored dates. The time required for cooling 800 kg of dates in the controlled CSR from 25 °C to the target temperature of 5 °C was approximately 48 h. The DUH precisely controlled the RH at the maximum RH set point of 80% in the tested CSR at 5 °C. The controlled RH at 80% has a positive impact on the physicochemical characteristics of the stored dates. It significantly reduced the weight loss of the fruits and preserved fruit mass, moisture content, water activity, firmness, and color parameters. However, no significant effect was observed on fruit dimensions, sphericity, and aspect ratio. The microbial loads of mesophilic aerobic bacteria, molds, and yeasts fell within the acceptable limits in all tested CSRs. Both stored date fruits and artificially infested dates showed no signs of insect activity in the controlled CSR at the temperature of 5 °C and RH of 80%. The DUH proved to be a promising technology for postharvest quality management for dates during cold storage.

scholarly journals Performance investigation of integrated PVT/adsorption cooling system under the climate conditions of Middle East

2020 ◽  
Vol 6 ◽  
pp. 168-173
Author(s):  
Ahmed A. Hassan ◽  
Ahmed E. Elwardany ◽  
Shinichi Ookawara ◽  
Ibrahim I. El-Sharkawy
Keyword(s):  
Middle East ◽  
Cooling System ◽  
Climate Conditions ◽  
Adsorption Cooling System

Net precipitation assessment in a grassland and soil moisture response at plot scale in a temperate climate

2021 ◽  
Author(s):  
Gökben Demir ◽  
Johanna Clara Metzger ◽  
Janett Filipzik ◽  
Christine Fischer ◽  
Beate Michalzik ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Spatial Variation ◽  
Canopy Structure ◽  
Sampling Period ◽  
Temperate Climate ◽  
Small Scale ◽  
Spatial Effects ◽  
Mixed Effect ◽  
Canopy Development ◽  
Canopy Effect

<div> <p>Evidence on spatial variation of net precipitation in grasslands is scarce. Challenges arise due to a small-scale canopy structure of grasslands.</p> <p>In this study, we designed and tested a new in-situ measurement device (interception grid) to assess net precipitation in grasslands. The collector allows the natural development of the canopy. We tested the device both in the lab for splash loss and in the field to test its capacity to assess net precipitation. In the field, we installed 25 collectors on a grassland within the Hainich Critical Zone Exploratory (Thuringia, Germany), 23 of which were paired with soil moisture sensors. We conducted weekly measurements gross and net precipitation (above and below the canopy), along with grass height in 2019 (March-August) and 2020 (January -February). We categorized the data into two groups (‘covered,’ ‘uncovered’), accounting for canopy development.</p> <p>In the lab, we found that the drop size strongly affects splash loss. Drops of ca. 2 mm, created more than 16% splash loss, decreasing to less than 3% for drops <1.5 mm. Drop sizes <1.75 mm during the sampling period (2019) suggest low to intermediate splash loss in the field, further decreased in the covered period as the canopy contact slows down the drops. Grid measurements corrected with estimated splash loss during the uncovered period agreed well with gross precipitation. Using linear mixed effect models, we found that wind speed and grass height significantly affected the grid measurements of covered periods. Therefore, grids were able to capture net precipitation variation due to grass development. These steps encouraged us to examine the canopy effect in the soil moisture response to rainfall.</p> <p>Soil moisture response over the entire period was not related to the spatial variation of net precipitation. However, for the drier period (June-August 2019), when the spatial variation in soil moisture is higher, and the overall response to rain events stronger, net precipitation slightly affected soil moisture response. LMEM analysis to estimate factors on soil moisture response showed that grass height, net precipitation are significant predictors. Yet, there is no remarkable difference between using net precipitation and gross precipitation as potential drivers for soil moisture response, indicating that the spatial effects are comparatively small. Overall, our findings suggest that the grids are cable to catch canopy effects on the precipitation, while the effect of wind on under-catch still needs to be investigated further.</p> </div>

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