Increasing the energy efficiency of fan systems by using outlet diffuser

Popov, Gencho; Klimentov, Kliment; Kostov, Boris; Dimitrova, Reneta

doi:10.1109/eeae49144.2020.9279107

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…As mentioned in the Introduction, the use of a diffuser installed at the outlet of a fan system can improve the system energy efficiency. In accordance with [3], the reduction of specific fan power ∆SFP when using a diffuser installed at the system output and achieving the initial operating mode after VFD flow regulation is applied, may be determined using the following equation:…”

Section: Analysis Of the Results Obtainedmentioning

confidence: 99%

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Methods for increasing the energy efficiency of fan systems using wide-angle plane diffusers with splitter vanes

Klimentov,

Popov,

Kostov

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Fan systems used to transport fluids are widely used and have become a major consumer of electrical energy worldwide. A significant part of the available energy of transported air in HVAC systems has usually been lost (in the form of dynamic pressure) at the system outlet. It is well-known that using outlet diffusers leads to this energy loss be reduced. In some cases, it is necessary to use shortened wide-angle diffusers, which have a higher coefficient of minor energy loss (local resistance). In the present work, a numerical study of the possibilities of increasing the energy efficiency of wide-angle plane diffusers, using splitter vanes, is accomplished. Diffusers with expansion angles of 30, 45 and 60 deg studied. The results obtained indicate the impact of the number of splitter vanes on the minor energy (local resistance) loss coefficient of the studied diffusers.

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Section: Analysis Of the Results Obtainedmentioning

confidence: 99%

“…Studies concerning the determination of the impact of the geometric features of conical diffusers on reducing the consumption of fan systems are presented in [2] and [3]. Often, air ducts, used in ventilation systems, are designed with a rectangular cross-section.…”

Section: Introductionmentioning

confidence: 99%

Methods for increasing the energy efficiency of fan systems using wide-angle plane diffusers with splitter vanes

Klimentov,

Popov,

Kostov

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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show abstract

“…To realize the high-speed operation of the valve and the displacement of the spool, high power of the controlled spool and high electrical power consumption are required. The technical solution for the pneumatic high-speed valve to have a powerful coil 80 W; 24 VDC which enables the fast control [8]. Once the pneumatic valve is energized at 24 VDC, its spool is moved to switch from the "OFF" position to the "ON" position, but to hold it in this position usually not the full power is needed, but only part of it to hold the spool in the operating position, usually this is 70/75% less power than the rated Fig.…”

Section: Methodsmentioning

confidence: 99%

Speed Control of Pneumatic Cylinders Using High Speed 2 Port on/Off Valves With Pulse Width Modulation

Iliev,

Hristov

2024

ETR

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This paper presents the possibility of controlling the speed of a different types of pneumatic cylinder with high speed 2-position valves a controller using Pulse Width Modulation /PWM/. To increase the energy efficiency of pneumatic power transmission systems, modern control method for speed control pneumatic cylinders is applied. This is realised by high speed 2 port ON/OFF valves, digital control by computer and virtual instruments made with specialized software. An electronic block implemented with a PWM and an energy saving amplifier is used for control high speed 2 port ON/OFF valves. Practical realization of PWM controlled electropneumatic power transmission system is shown and experimental characteristics for variable speed of the pneumatic actuator are obtained. The experimental results are shown in few graphs. The presented experimental studies prove the possibility of smoothly adjusting the speed of pneumatic cylinders using two-position valves, controlled with PWM. Using this control method makes it possible to replace expensive servo valves for precise speed control.

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Analysis of the Meteorological Factors Affecting the Efficient Use of Electricity in Water Supply Systems

Krasteva

Ivanova

2022

2022 8th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)

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Increasing the energy efficiency of fan systems by using outlet diffuser

Cited by 3 publications

References 4 publications

Methods for increasing the energy efficiency of fan systems using wide-angle plane diffusers with splitter vanes

Methods for increasing the energy efficiency of fan systems using wide-angle plane diffusers with splitter vanes

Speed Control of Pneumatic Cylinders Using High Speed 2 Port on/Off Valves With Pulse Width Modulation

Analysis of the Meteorological Factors Affecting the Efficient Use of Electricity in Water Supply Systems

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