Removal of air blown dust from photovoltaic arrays using forced air flow of return air from air conditioning systems

2012 ◽  
Author(s):  
Ali Assi ◽  
Ahmad Hassan ◽  
Maitha Al-Shamisi ◽  
Hassan Hejase
Keyword(s):  
Air Conditioning ◽  
Air Flow ◽  
Photovoltaic Arrays ◽  
Forced Air ◽  
Air Conditioning Systems

scholarly journals МОДЕЛИРОВАНИЕ И АЛГОРИТМИЗАЦИЯ ПРОЦЕССОВ УПРАВЛЕНИЯ ЭКСПЛУАТАЦИЕЙ СУДОВЫХ ЭНЕРГЕТИЧЕСКИХ СИСТЕМ

2020 ◽  
pp. 46-51
Author(s):  
Ходарина Кристина Валериевна ◽  
Гаркуша Галина Геннадиевна
Keyword(s):  
Air Conditioning ◽  
Air Flow ◽  
Control Process ◽  
Integrated System ◽  
Normal Operation ◽  
Climate Control ◽  
Air Conditioning Systems ◽  
Technical Solutions ◽  
Marine Climate ◽  
Accuracy Speed

An approach to solving the problem of optimizing the climate control process in a ship`s room using elements. The specific microclimate of the ship`s premises is determined by their isolation from external atmospheric influences, small volumes and a relatively large number of people, as well as the saturation with various mechanisms, systems, devices, various cargoes transported and the features of the marine climate. Presented technical solutions at the stage of elaboration and the implementation of algorithms based on modern components assume performance of the specified requirements for normal operation of ventilation systems and conditioning of the working area. The article presents the algorithm of the methodology and calculation of elements of system of ventilation and air conditioning systems with rapidly varying air flow in one zone of production facilities. With the aim of improving the accuracy, speed and efficiency, the integrated system that combines proper ventilation, air conditioning and a quantitative regulation of intake air.

scholarly journals Coupling Effect of Air Flow Rate and Operating Conditions on the Performance of Electric Vehicle R744 Air Conditioning System

2021 ◽  
Vol 11 (11) ◽  
pp. 4855
Author(s):  
Anci Wang ◽  
Jianmin Fang ◽  
Xiang Yin ◽  
Yulong Song ◽  
Feng Cao ◽  
...  
Keyword(s):  
Electric Vehicle ◽  
Flow Rate ◽  
Air Conditioning ◽  
Volume Flow Rate ◽  
Air Flow ◽  
Volume Flow ◽  
Air Flow Rate ◽  
Air Volume ◽  
Discharge Pressure ◽  
Air Conditioning Systems

The air flow rate on the gas cooler side is one of the key parameters affecting the performance and running safety of transcritical CO2 electric vehicle air conditioning systems. After experimentally analyzing the effects of the air volume flow rate in the gas cooler on the cycle parameters and system performance, a novel method to evaluate the optimal air flow rate was proposed. In addition, the effect of the gas cooler air volume flow rate on the key performance parameters of the system (e.g., optimal discharge pressure) was explored. Finally, the coupling effects of the compressor speed, ambient temperature and optimal air flow rate on the system performance was also exhaustively assessed. It was found that as the discharge temperature, the CO2 temperature at the gas cooler outlet and the discharge pressure did not vary more than ±2%, the corresponding gas cooler air volume flow rate was optimal. For the single-row and dual-process microchannel evaporator used in this work, the recommended value of the optimal gas cooler air volume flow rate was 2500 m3·h−1. The results could provide reference for the fan speed design of electric vehicle CO2 air conditioning systems, especially for the performance under idling model.

scholarly journals Minimization of fan energy consumption in ventilation and (or) air-conditioning systems as an optimization calculus of variations

2019 ◽  
Vol 116 ◽  
pp. 00033
Author(s):  
Michał Karpuk
Keyword(s):  
Energy Consumption ◽  
Calculus Of Variations ◽  
Flow Rate ◽  
Air Conditioning ◽  
Air Flow ◽  
Rate Function ◽  
Hazardous Substances ◽  
Air Flow Rate ◽  
Starting Conditions ◽  
Air Conditioning Systems

The article presents an optimization calculus of variations of fan energy consumption in ventilation and (or) air-conditioning systems. It defines an air flow rate function that depends on the time of operation in the defined room size, starting conditions and the function of hazardous substances emission rate in the room. The differential form of air flow rate dependence on density of hazardous substances allows to establish a connection between air pollution in the room and a fan air flow rate, i.e. fan energy consumption. Creating a fan energy model experiment in the room in different conditions allows to minimize energy consumption to 5–30% depending on existing conditions.

scholarly journals Optimization of recirculating laminar air flow in operating room air conditioning systems

2016 ◽  
Vol 6 (2) ◽  
pp. 115-120
Author(s):  
Enver Yalcin ◽  
Mehmet Ziya Sogut ◽  
Seckin Erdogmus ◽  
Hikmet Karakoc
Keyword(s):  
Laminar Flow ◽  
Operating Room ◽  
Air Conditioning ◽  
Air Flow ◽  
Operating Rooms ◽  
Flow Energy ◽  
Flow Device ◽  
Laminar Air Flow ◽  
Almost All ◽  
Air Conditioning Systems

The laminar flow air-conditioning system with 100% fresh air is used in almost all operating rooms without discrimination in Turkey. The laminar flow device which is working with 100% fresh air should be absolutely used in Type 1A operating rooms. However, there is not mandatory to use of 100% fresh air for Type 1B defined as places performed simpler operation. Compared with recirculating laminar flow, energy needs of the laminar flow with 100 % fresh air has been emerged about 40% more than re-circulated air flow. Therefore, when a recirculating laminar flow device is operated instead of laminar flow system with 100% fresh air in the Type 1B operating room, annual energy consumption will be reduced. In this study, in an operating room with recirculating laminar flow, optimal conditions have been investigated in order to obtain laminar flow form by analyzing velocity distributions at various supply velocities by using computational fluid dynamics method (CFD).

Online Optimal Ventilation Control of Building Air-conditioning Systems

2010 ◽  
Vol 20 (1) ◽  
pp. 129-136 ◽  
Author(s):  
Shengwei Wang ◽  
Zhongwei Sun ◽  
Yongjun Sun ◽  
Na Zhu
Keyword(s):  
Energy Consumption ◽  
Flow Rate ◽  
Control Strategy ◽  
Air Conditioning ◽  
Air Flow ◽  
Air Flow Rate ◽  
Ventilation Control ◽  
Occupancy Detection ◽  
Critical Zones ◽  
Air Conditioning Systems

This paper presents a ventilation control strategy for multi-zone variable air volume (VAV) air-conditioning systems; integrating the sequential split-range control strategy for air-handing units with an aim to optimise the fresh air flow rate by compromising the indoor air quality and energy consumption. In this strategy, a CO2 -based adaptive demand-controlled ventilation scheme would employ a dynamic multi-zone ventilation equation for multi-zone air-conditioning systems, in which a CO2-based dynamic occupancy detection scheme would be used for online occupancy detection. The strategy would identify the critical zones online, and fully consider the outdoor air demand of critical zones, while, a model-based fresh air flow rate optimal control scheme is employed for VAV air-conditioning systems with the primary air handling units. An adaptive optimisation algorithm would be used for optimising the fresh air flow rate to minimise the energy consumption. The energy saving potentials in the Hong Kong climate condition by optimising fresh air ventilation and the practical implementation of the control strategy are also discussed in this paper.

scholarly journals Using Neural Networks for Determining Velocity Vectors of Air Flow Visualized by Helium Bubbles

2014 ◽  
Vol 62 (4) ◽  
pp. 757-768
Author(s):  
Jiří Šťastný ◽  
Jan Richter ◽  
Petr Šťastný
Keyword(s):  
Neural Network ◽  
Air Conditioning ◽  
Velocity Vector ◽  
Comprehensive Evaluation ◽  
Air Flow ◽  
Helium Bubbles ◽  
Video Footage ◽  
Video Frames ◽  
Air Stream ◽  
Air Conditioning Systems

One of the important characteristics of air flow is the velocity of flow. To determine the speed, in addition to other methods, we also use the helium bubbles seeding visualization method, when bubbles are injected into the air stream so that the air flow is obvious to the eye. If a video of such flow is taken, it is possible to determine velocity vectors in a pair of consecutive frames of this video footage, derived from the change in position of individual bubbles.This article describes a method of monitoring the bubbles in consecutive video frames. During this process, helium bubbles are detected in the first image of the pair, either by a firmly defined procedure, or with the use of a neural network. For detected bubbles, the velocity vectors are determined according to the way in which they move, therefore, according to their location in the following frame. Another neural network then determines the velocity vector at any point of image, which will be implemented in the construction of vector maps for the first image. A vector map is used for comprehensive evaluation of air flow and thus, plays an important role in the development of ventilation and air conditioning systems.

ANALYSIS OF COMPETING VARIANTS OF AIR CONDITIONING SYSTEMS WITHOUT AIR EXTRACTION FROM ENGINES AT THE STAGE OF PASSENGER AIRCRAFT ONBOARD SYSTEMS CONCEPTUAL DESIGN

2019 ◽  
Vol 6 (3) ◽  
pp. 80-85
Author(s):  
Denis Igorevich Smagin ◽  
Konstantin Igorevich Starostin ◽  
Roman Sergeevich Savelyev ◽  
Anatoly Anatolyevich Satin ◽  
Anastasiya Romanovna Neveshkina ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Air Conditioning ◽  
Research University ◽  
Cooling System ◽  
Fuel Efficiency ◽  
Air Cooling ◽  
Moscow Aviation Institute ◽  
Air Conditioning System ◽  
Low Efficiency ◽  
Air Conditioning Systems

One of the ways to achieve safety and comfort is to improve on-board air conditioning systems.The use of air cooling machine determines the air pressure high level at the point of selection from the aircraft engine compressor. Because of the aircraft operation in different modes and especially in the modes of small gas engines, deliberately high stages of selection have to be used for ensuring proper operation of the refrigeration machine in the modes of the aircraft small gas engines. Into force of this, most modes of aircraft operation have to throttle the pressure of the selected stage of selection, which, together with the low efficiency of the air cycle cooling system, makes the currently used air conditioning systems energy inefficient.A key feature of the architecture without air extraction from the main engines compressors is the use of electric drive compressors as a source of compressed air.A comparative analysis of competing variants of on-board air conditioning system without air extraction from engines for longrange aircraft projects was performed at the Moscow Aviation Institute (National Research University).The article deals with the main approaches to the decision-making process on the appearance of a promising aircraft on-board air conditioning system at the stage of its conceptual design and formulated the basic requirements for the structure of a complex criterion at different life cycle stages.The level of technical and technological risk, together with a larger installation weight, will require significant costs for development, testing, debugging and subsequent implementation, but at the same time on-board air conditioning system scheme without air extraction from the engines will achieve a significant increase in fuel efficiency at the level of the entire aircraft.

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