Improving the Ventilation of Machinery Spaces with Direct Adiabatic Cooling System

Mihai, Victor; Rusu, Liliana

doi:10.3390/inventions7030078

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…In order to improve the ventilation system in case of high temperatures and dry outside air, additional systems like adiabatic cooling can be analysed. [8]…”

Section: Fig1 Typical Arrangement For Ventilation Of Engine Roommentioning

confidence: 99%

Main requirements for ventilation of different rooms on the ships

Mihai

Rusu

Presura

2022

Ann.UDJG.ShipBuilding

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The ventilation system is vital for the good functionality of the vessels and its purpose is to ensure the requested environmental condition for equipment and people. In addition, the ventilation system is assuring the safety of the vessels by reducing the concentration of the flammable and toxic gases which can escape from the equipment, systems, and storage tanks. Also, in case of fire, the ventilation system must be able to extract the smoke from engine rooms and public atriums spaces in passenger's vessels. The paper is a short over-view of the main requirements and recommendations for ventilation systems of different compartments on the vessel and different types of vessels. The requirements related to the safety of the vessel and people on board are stated in Class and IMO / Administration rules and regulations while the calculation of the air flow needed to remove the heat radiated inside the room is indicated in ISO standards.

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“…In order to improve the ventilation system in case of high temperatures and dry outside air, additional systems like adiabatic cooling can be analysed. [8]…”

Section: Fig1 Typical Arrangement For Ventilation Of Engine Roommentioning

confidence: 99%

Main requirements for ventilation of different rooms on the ships

Mihai

Rusu

Presura

2022

Ann.UDJG.ShipBuilding

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CFD Analysis and Wind Tunnel Experiment for Ventilation Ducts with Structural Elements Inside

Mihai

Rusu

2023

JMSE

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Ventilation ducts with a high cross-sectional area are frequently built as structural ducts that include inside transversal structural beams. In this way, the cross-sectional area requested is respected, but the transverse structural elements will have a big impact on the airflow, with eventually additional noise and vibration and a high amount of energy wasted across the beams. From this perspective, the aim of this study is to evaluate the impact of the transversal beams inside the ventilation ducts, to analyze different alternatives for airflow improvement using computational fluid dynamics (CFD) simulation, and to check the simulation results in the wind tunnel with an experimental model. The results of the experimental measurements have highlighted the high-pressure drop and, consequently, the high energy wasted across the transversal structural beams. It was found that the airflow downstream of the beam is changing the flow direction, and high turbulences and vortices are initiated in the shadow of the beam. According to the CFD analysis, the ventilation system can be improved by adding airflow deflectors in the beam area. In this way, the high turbulences are reduced, the vortices and backflow are canceled, and the pressure losses across the beam area of the ventilation duct are reduced by up to 90% compared with the beam without a deflector. Therefore, the energy wasted in the beam area can be reduced by up to 90%.

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Adiabatic Cooling System Working Process Investigation

et al. 2023

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Avoiding heat stress in cows is an important condition for animal productivity and the maintaining of animal health. For this, it is necessary to provide an optimal microclimate in cowsheds using systems of air cooling. The paper analyzes one of these systems—an air humidification–cooling system. The research was carried out in a semi-insulated box-type cowshed containing 244 places. The changes in temperature, relative humidity, and temperature humidity index (THI) were studied for the air coming from outside and for the air inside the cowshed. Considering the fact that the cows were in the cowshed most of the time (51.5%) under heat stress, the use of a cooling system is appropriate. It was established that a cooling system is capable of compensating for heat released by animals. It was determined that with an increase in air temperature the relative efficiency of a cooling system increases. An intensive constant air exchange provided using fan operation avoids an excessive growth of relative humidity in a cowshed. To reduce the consumption of electricity and water, the paper suggests regulation of both the power of the fans of the system and the water supply to the nozzles not using temperature but using THI. Theoretically, when THI is used to regulate the operation of the cooling system, the consumption of electrical energy is reduced by 17.8%, and the consumption of water is reduced by 43.2% when compared to the option when the temperature is used to regulate the operation of a cooling system.

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Improving the Ventilation of Machinery Spaces with Direct Adiabatic Cooling System

Cited by 3 publications

References 8 publications

Main requirements for ventilation of different rooms on the ships

Main requirements for ventilation of different rooms on the ships

CFD Analysis and Wind Tunnel Experiment for Ventilation Ducts with Structural Elements Inside

Adiabatic Cooling System Working Process Investigation

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