Performance analysis of an integrated cooling system consisted of earth-to-air heat exchanger (EAHE) and water spray channel

Ahmadi, Somayeh; Shahrestani, Misagh Irandoost; Sayadian, Shahide; Maerefat, Mehdi; Poshtiri, Amin Haghighi

doi:10.1007/s10973-020-09268-9

Cited by 21 publications

(6 citation statements)

References 27 publications

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“…Heat transfer by forced convection was estimated through a dimensionless model in [10,20], where ℎ is estimated by (7) for Nusselt number (Nu): The equivalent length refers to the longest building length in the wind direction for a finite length building, expressed by:…”

Section: A Energy βAlancementioning

confidence: 99%

A Numerical Model for Heat and Moisture Transfer in Porous Media of Building Envelopes

Scussiato

Ito

Ramis

et al. 2022

Eng. Technol. Appl. Sci. Res.

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This study presents a one-dimensional quantitative analysis of unsaturated flow in natural stones using a numerical model (Finite Difference Method) and a mass balance for the heat flow. For that, we considered heat and moisture transfer between the external environment and a porous media (sandstone and limestone) with homogeneous characteristics. For unsaturated water flow, Richards’ equation and the formulation proposed by Gardner for volumetric water content and hydraulic conductivity were considered. The results of the numerical analysis showed that the evaporation of porewater throughout summer days (January 3rd and 4th) considerably reduced the temperature of the roof by about 8°C. The accumulated conductive heat flow and the volumetric water content were also reduced due to the evaporation process. This fact indicates that evaporation can be useful in providing thermal comfort and, consequently, in improving the energy efficiency of buildings with natural stones as envelopes.

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Section: A Energy βAlancementioning

confidence: 99%

A Numerical Model for Heat and Moisture Transfer in Porous Media of Building Envelopes

Scussiato

Ito

Ramis

et al. 2022

Eng. Technol. Appl. Sci. Res.

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“…In the last few decades, integrated cooling systems have been developed by various authors for air conditioning of residential buildings, school classrooms, animal houses, and greenhouses (Ahmadi et al, 2021; Morshed et al, 2018), which indicates that conventional cooling systems can be substituted with renewable energy‐based systems. Furthermore, the performance of cooling system is often affected by many input parameters, including the thickness of the cooling pad, water flow rate, air velocity, and so forth.…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of integrated earth air heat exchanger and direct evaporative cooling system using ANN and RSM approaches for preserving fruits and vegetables

Nishad,

Mangaraj

2023

J Food Process Engineering

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Conventional air‐conditioned storage systems are more energy intensive which requires a consistent supply of electricity. Apart from this, it is costly and not suitable in remote areas where electricity is almost inaccessible. Therefore, the present study aimed to test the performance and feasibility of an integrated earth air heat exchanger and direct evaporative cooling system for storage of fruits and vegetables. The effects of air velocity (4–6 m/s), water flow rate (0.032–0.096 kg/s), and thickness of the cooling pad (50–150 mm) with corresponding responses were investigated in order to develop response surface methodology (RSM) and artificial neural network (ANN) models and compared them to predict temperature drop and humidity rise. Using RSM model, the optimum values for maximum temperature drop (16.80°C) and humidity rise (70.85%) within a range of input variables were found to be 4 m/s air velocity, 0.065 kg/s water flow rate, and 150 mm thickness of the cooling pad. For predicting the temperature drop and humidity rise, the higher (0.992 and 0.998) lower MAE (0.045 and 0.064), RMSE (0.187 and 0.266), and values (0.028 and 0.001) were observed in the ANN model. The developed ANN model was better than RSM models, and the model prediction was in good agreement with experiment values within the range of ±5% uncertainty. The results of this study indicate that the proposed cooling system can be successfully applied to store horticultural commodities.Practical ApplicationIntroduced hybrid cooling technique is low‐cost and eco‐friendly, and can be commercially used for on‐farm storage of fruits and vegetables to enhance their shelf life. The system is helpful for smallholder farmers/retailers to maintain the quality of the commodity during storage, minimize post‐harvest losses, and fetch good market value for the commodity.

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“…Because of the complexity of two phase flow in evaporative cooling and participation of a lot of attendant parameters in it, numerical studies are more prevalent than the experimental studies [11]. These numerical investigations were carried out for inlet air flow of cooling towers, hot plates, air-cooled condensers, heat exchangers and other thermal components [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis on the impact of spray charactristics on evaporative cooling process

Amoli

Ajarostaghi

SEDIGHI

et al. 2022

Journal of Thermal Engineering

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In hot and dry climates, evaporative cooling of the air by water spray can be applied in several requirements, such as evaporative condensers which the airflow is precooled by the water spray before it reaches the condenser. The interaction between water droplets and the air is a complicated two-phase flow that is affected by the several parameters. Here, an Eulerian-Lagrangian 3D model was developed to investigate the influence of important parameters on spray cooling performance in a rectangular duct. The evaluated parameters include the number of nozzles, inlet air flow rate, and spray water flow rate. The results represented that growth in the number of nozzles causes a reduction in the spray cooling efficiency. Thi s is due to decrease of droplets retention time within the duct by increasing the number of nozzles at a constant total spray flow rate in the cases. The maximum and minimum spray cooling efficiency belong to the cases with one nozzle at water flow rate of 20 l/h and four nozzle at water flow rate of 5 l/h, respectively. The difference between spray cooling efficiency at 3 and 4 number of nozzles is less than 1.8%. Moreover, increasing the air flow rate from 0.5 l/h to 2 l/h (by 300%) makes a decrease in the spray cooling efficiency up to 58.6%.

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Performance analysis of an integrated cooling system consisted of earth-to-air heat exchanger (EAHE) and water spray channel

Cited by 21 publications

References 27 publications

A Numerical Model for Heat and Moisture Transfer in Porous Media of Building Envelopes

A Numerical Model for Heat and Moisture Transfer in Porous Media of Building Envelopes

Modeling and optimization of integrated earth air heat exchanger and direct evaporative cooling system using ANN and RSM approaches for preserving fruits and vegetables

Thermal analysis on the impact of spray charactristics on evaporative cooling process

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