Air Flow Straighteners’ Application to Reduce the Power Consumption of Exhaust Ventilation Schemes

2018 ◽  
Vol 875 ◽  
pp. 137-140 ◽  
Author(s):  
Valery N. Azarov ◽  
Natalia M. Sergina ◽  
I.V. Stefanenko
Keyword(s):  
Power Consumption ◽  
Air Flow ◽  
Ventilation System ◽  
Aerodynamic Resistance ◽  
Experimental Studies ◽  
Swirling Flows ◽  
Dust Collector ◽  
Exhaust Ventilation ◽  
Outlet Pipe ◽  
Ventilation Systems

It was proposed to use air flow screw straightened units in outlet pipe of the dust collectors to reduce the aerodynamic resistance of exhaust ventilation systems. It is allowed to decrease power consumption for their maintenance operation consequently. The article describes the results of experimental studies to evaluate its effectiveness by applying the tangential screw straightened unit within ventilation system. The obtained results showed that the use of this device allows reducing the aerodynamic resistance of the cyclone by 14.6%, and for counter-swirling flows’ dust collector (CSFC) by 17.2-23.6%. It was found that meanings of the aerodynamic resistance depend on value the share proportion of the flow entering into lower CSFC apparatus’ input.

OPTIMIZING THE CHOICE OF VENTILATING AIR CLEANING EQUIPMENT IN SYSTEMS OF LOCAL EXHAUST VENTILATION

2017 ◽  
Vol 7 (3) ◽  
pp. 19-23
Author(s):  
Svetlana M. PURING ◽  
Denis N. VATUZOV ◽  
Gennady I. TITOV
Keyword(s):  
Indoor Air ◽  
Desirability Function ◽  
Ventilation System ◽  
Aerodynamic Resistance ◽  
Multicriteria Analysis ◽  
Local Exhaust Ventilation ◽  
Air Cleaning ◽  
Exhaust Ventilation ◽  
Industrial Buildings ◽  
Cleaning Equipment

Functioning of industrial buildings is impossible without correctly organized ventilation system. Its work both regulates heat moist mode and the required indoor air purity that is cleaned with the help of air cleaning equipment. To make decision to construct the required air cleaning equipment at the enterprise it is worthwhile to give additional parameters and to solve a problem of multicriteria optimization to get the best results. The choice of the best variant is supposed to be carried out using Harrington’s desirability function. The conducted multicriteria analysis allowed to reveal optimum characteristics of air cleaning equipment, based on the required purifi cation air degree, the geometrical sizes of the equipment and aerodynamic resistance while introducing any particular device.

The Use of Decentralized Ventilation Systems with Heat Recovery in the Historical Buildings of St. Petersburg

2014 ◽  
Vol 635-637 ◽  
pp. 370-376 ◽  
Author(s):  
Vera Murgul ◽  
Dusan Vuksanovic ◽  
Nikolay Vatin ◽  
Viktor Pukhkal
Keyword(s):  
Heat Recovery ◽  
Ventilation System ◽  
Energy Performance ◽  
Saint Petersburg ◽  
Exhaust Ventilation ◽  
Different Types ◽  
Energy Efficiency Standards ◽  
Energy Efficient Building ◽  
Cultural Monuments ◽  
Ventilation Systems

Historic apartment buildings in Saint-Petersburg no longer meet today’s energy efficiency standards and need upgrading to achieve lower energy-consumption. The possibilities to upgrade old buildings – historic and cultural monuments – are initially limited. A controlled heat recovery ventilation system is considered to be an integral part of energy efficient building. Provided engineering facilities of a building are updated and reequipped energy performance increases without any impact on building exteriors. Different types of decentralized intake and exhaust ventilation systems with heat recovery based on various types of heat exchangers are considered in a detailed way.

scholarly journals Air Terminal Devices Developed for Personal Ventilation Systems

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1688
Author(s):  
Imre Csáky
Keyword(s):  
Thermal Comfort ◽  
Air Flow ◽  
Ventilation System ◽  
Air Velocity ◽  
Head Region ◽  
Personal Ventilation ◽  
The University ◽  
Velocity Turbulence ◽  
Ventilation Systems

Using the personal ventilation systems may improve the thermal comfort sensation. At the University of Debrecen, a personal ventilation system was developed named ALTAIR. This paper presents the results of mean air velocity, turbulence grade, and draught measurements related to newly developed air terminal devices which are connected to the ALTAIR personal ventilation system. In order to define the measurement points it was essential to test the new air terminal devices (ATDs) in front of a black wall and smoke puffs. A series of measurements were carried out with isothermal air flow, mean air velocity, turbulence grade, and draught around the occupant head region in order to improve the thermal comfort sensation. Five different ATDs were analyzed.

Comparison of Mixed and Stratified Ventilation Systems in Production Areas: Experimental and Simulation Studies

2013 ◽  
Author(s):  
Mirko Schäfer ◽  
Johannes Wagner ◽  
Jens Hesselbach ◽  
Long Phan ◽  
Cheng-Xian Lin
Keyword(s):  
Energy Demand ◽  
Ventilation System ◽  
Experimental Studies ◽  
Carbon Dioxide Concentration ◽  
Simulation Models ◽  
Cooling Capacity ◽  
Climatic Regions ◽  
Industrial Buildings ◽  
Mass Loads ◽  
Ventilation Systems

Ventilation system can have significant influences on the energy consumption, especially in factories with high thermal loads. To remove generated thermal and mass loads from manufacturing areas, several mechanisms can be applied: mixing and layering ventilation. This paper shows experimental studies to compare mixed and stratified ventilation systems for industrial buildings. These experiments were conducted in a factory model with a scale of 1:2.5. The measurements consist of vertical distribution of carbon dioxide concentration and temperature in the ambient room. Additionally, a simulation study was conducted based on the same factory model to predict the annual energy demand of mixed and stratified ventilation systems in different climatic regions. The simulation models were validated with measurements from machines and devices in the authors’ laboratories and in the factories of project partners. The results show advantages in airflow, air quality, cooling capacity and energy demand at different climatic zones when using stratified ventilation.

scholarly journals Study of the optimal placement of exhaust ventilation equipment in a poultry house using numerical simulation

2020 ◽  
pp. 89-101
Author(s):  
V. Trokhaniak ◽  
Keyword(s):  
Mass Transfer ◽  
Numerical Modeling ◽  
Heat And Mass Transfer ◽  
Egg Production ◽  
Air Flow ◽  
Ventilation System ◽  
Optimal Placement ◽  
Feed Consumption ◽  
Poultry House ◽  
Exhaust Ventilation

Keeping poultry in damp and cold rooms with poor ventilation system reduces the weight gain of the bird, reduces its egg production and increases the incidence of young animals, as well as excessive feed consumption and exceeding the growing period established by technical regulations. The aim of the study was to determine the effective placement of exhaust ventilation equipment at the height of the end wall of the poultry house to improve the ventilation system, reduce stagnant air zones and improve the microclimate. The numerical modeling of hydrodynamics, heat and mass transfer processes during air ventilation in poultry buildings is carried out. The analysis of the conditions of heat and mass transfer in the poultry house, depending on the placement of fans along the height of the house, and the efficiency of the location of such equipment was determined. The system for maintaining the microclimate in poultry houses was considered in the presence of a system for cooling the outside air with water from an underground well. The ventilation system uses exhaust ventilation equipment with a fan wheel diameter of 1.25 m. In the simulation, the fans were installed at a height of 1.125, 1.5 and 1.875 m from the floor to the center of the fan axis. Simulation was performed for 2D CFD models using ANSYS Fluent software. The results of CFD analysis of the air flow pattern and the thermal state inside the house are presented. As a result of numerous studies, the geometry of the location of the ventilation equipment has been found. It is shown that it is advisable to install ventilation equipment at a height of 1.5 m. At the same time, the size of stagnant zones and the uneven distribution of air velocity near the bird are reduced. Numerical modeling was carried out in order to minimize the size of stagnant zones, equalize the air flow and improve the temperature indicators in the poultry house.

scholarly journals Exergy-based Control of a Dwelling Ventilation System with Heat Recovery

2019 ◽  
pp. 114-116
Author(s):  
Volodymyr Voloshchuk ◽  
Mariya Polishchuk
Keyword(s):  
Power Consumption ◽  
Heat Recovery ◽  
Operation Mode ◽  
Ventilation System ◽  
Primary Energy ◽  
Energy Sources ◽  
Annual Saving ◽  
Operating Modes ◽  
Ventilation Systems

On the base of exergy-based approach it is shownthat for the ventilation systems there are operating modes forwhich heat recovery increases exergy of fuel expended to providethe ventilation air compared to cases without bringing anyrecovery of heat and additional power consumption to drive theair flow by the fans. For the specified system, in case of switchingventilation unit to the operation mode of lower values of spentfuel exergy it is possible to provide annual saving from 5 to 15 %of the primary energy sources.

Experimental Studies of VKR-4 Fans Working in Agricultural Premises

2021 ◽  
Vol 2 (43) ◽  
pp. 9-14
Author(s):  
Nikolay V. Ksenz ◽  
◽  
Gennadiy V. Stepanchuk ◽  
Pavel V. Gulyaev ◽  
Konstantin K. Pupenko
Keyword(s):  
Power Consumption ◽  
Electric Motor ◽  
Supply Voltage ◽  
Ventilation System ◽  
Experimental Studies ◽  
Animal Husbandry ◽  
Research Purpose ◽  
Line Voltage ◽  
Air Supply ◽  
Agricultural Producer

One of the most important factors for increasing productivity in animal husbandry, poultry farming, and in greenhouse complexes, including for growing mushrooms, is the microclimate. To ensure normal air exchange in agricultural premises, roof fans with horizontal discharge of the VKR-4 type are recommended and used. When using ventilation equipment, it is necessary to take into account the technological requirements for creating a microclimate and the capabilities of the equipment. (Research purpose) The research purpose is in justifying the rational parameters of the system for creating a microclimate in agricultural premises when using a fan of the VKR-4 type, and to give recommendations to the agricultural producer. (Materials and methods) Authors investigated the efficiency of regulating the performance of the ventilation system by means of a valve in the exhaust shaft of the ventilator and by changing the supply voltage of the electric motor. (Results and discussion) The article presents experimental studies of the operation of the ventilation system when using a roof fan of the VKR-4 type to determine its effectiveness in order to maintain the required zootechnical parameters in rooms for keeping animals at the lowest energy costs. (Conclusions) Regulating the performance of the ventilation unit by means of a mechanical flap in the exhaust shaft of the fan by changing the angle of its opening is uneconomical. The regulation by reversing the electric motor provides a 1:2 ratio of the air supply, but the power consumption of the electric motor increases almost twice during the reverse. When the fan performance is controlled by changing the motor voltage from 70 to 173 volts of line voltage, the performance increases, but with a further increase in voltage, it does not change, and the power consumption continues to increase.

scholarly journals Reducing power consumption of local exhaust ventilation systems

2020 ◽  
Vol 1683 ◽  
pp. 042015
Author(s):  
K I Logachev ◽  
A M Ziganshin ◽  
O A Averkova ◽  
A B Gol’tsov
Keyword(s):  
Power Consumption ◽  
Reducing Power ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation ◽  
Ventilation Systems

scholarly journals Choosing a Universal Air Collector Design for a Cylindrical-Shaped Hot-Wire Anemometer

2021 ◽  
Vol 24 (2) ◽  
pp. 6-15
Author(s):  
Oleh S. Tsakanian ◽  
◽  
Serhii V. Koshel ◽  
Keyword(s):  
Flow Rate ◽  
Measurement Errors ◽  
Air Flow ◽  
Aerodynamic Resistance ◽  
Experimental Studies ◽  
Flow Distribution ◽  
Hot Wire ◽  
Air Flow Rate ◽  
Measuring Device ◽  
Calibration Dependence

Air flow measurement at the outlets of air terminal devices installed in ventilation systems is very difficult. At the outlets of anemostats, swirl diffusers, grilles, the air flow can swirl, contract, or expand sharply, change its direction, etc., which causes great measurement errors. Therefore, it was necessary to develop a universal measuring device that would make it possible to measure air flow rate with high accuracy. It should consist of an air collector (for collecting and rectifying air flow) and a sensor for measuring air flow rate (integral hot-wire anemometer). Several air collector designs have been investigated. The parabolic air collector was chosen as the rational one. It has low aerodynamic resistance and good air flow distribution. To reduce the influence of turbulence and air swirling, a cylindrical stilling channel with a built-in rectifying grille is connected to the air collector. Experimental studies on various air distribution devices made it possible to obtain a refined calibration dependence for an integral hot-wire anemometer, the dependence being used to calculate air flow rate. The influence of the aerodynamic resistance of an airflow meter on air flow rate is taken into account with the help of a correction that must be introduced into the values measured.

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