Energy-Saving Operation Strategies for Air-Conditioning Systems in Response to Challenges Posed by Atmospheric Environment of Taiwan

2015 ◽  
Vol 764-765 ◽  
pp. 1075-1079
Author(s):  
Hui Ting Tang ◽  
Yuh Ming Lee
Keyword(s):  
Relative Humidity ◽  
Air Conditioning ◽  
Atmospheric Environment ◽  
Heat Index ◽  
Human Beings ◽  
Precise Control ◽  
Weather Patterns ◽  
Human Needs ◽  
Occupant Comfort ◽  
Air Conditioning Systems

Taiwan, located in subtropical areas, relies heavily on air-conditioning to adjust the environment to maintain occupant comfort and work efficiency. Among numerous indicators that measure living comfort, the one corresponding to the change of temperature and relative humidity is the most felt by people. This study will investigate data on changes in the atmospheric environment in Taiwan over the years, and will correlate them to temperature and relative humidity within the comfort range for human beings. The Heat Index will also be examined and applied in this research in order to help air-conditioning systems better adapt to more volatile weather patterns and variable human needs. A simultaneous and precise control of temperature and relative humidity with reference to the Heat Index can reduce the load for air-conditioning without compromising environmental comfort.

scholarly journals Proposed Strategies for Improving Poor Hygrothermal Conditions in Museum Exhibition Rooms and Their Impact on Energy Demand

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 620 ◽  
Author(s):  
Joanna Ferdyn-Grygierek ◽  
Krzysztof Grygierek
Keyword(s):  
Relative Humidity ◽  
Energy Demand ◽  
Air Conditioning ◽  
Control Strategies ◽  
Internal Heat ◽  
Current Method ◽  
Dramatic Improvement ◽  
Precise Control ◽  
Heating And Cooling ◽  
Microclimate Conditions

In museums, poor microclimate conditions, especially large changes in relative humidity and temperature, can lead to serious deterioration of the exhibits. Properly designed heating, ventilation, and air conditioning (HVAC) systems for precise control of the air parameters are required. However, due to the financial restrictions of museums, complex air-conditioning systems are often not feasible. In this study, we tested and propose novel methods to reduce the short- and long-term fluctuations in the relative humidity in exhibition rooms of a Polish museum. The methods only include indoor temperature and ventilation airflow control strategies, without the use of (de)humidification equipment. The analysis is based on simulations using EnergyPlus software. A multi-zone thermal model of the museum building was validated and calibrated with measured data. A full calendar year was simulated for five control cases (including the current method used) and two internal heat gain schedules. The energy demand for heating and cooling for each case was calculated. The combination of temperature control and adequate ventilation using ambient airflow allows for dramatic improvement in the microclimate conditions. The proportion of the year when the instantaneous indoor relative humidity is ±5% from set point decreased from 85% to 20%. A significant effect was obtained over the summer months.

scholarly journals Hygrothermal study of dwelling submitted to passive cooling

2018 ◽  
Vol 22 (6 Part A) ◽  
pp. 2597-2604
Author(s):  
Razika Kharchi ◽  
Khaled Imessad
Keyword(s):  
Relative Humidity ◽  
Thermal Comfort ◽  
Air Conditioning ◽  
Natural Ventilation ◽  
Energy Savings ◽  
Pilot Project ◽  
Passive Cooling ◽  
Free Cooling ◽  
Air Conditioning Systems ◽  
Good Agreement

A significant portion of energy consumed in buildings is due to energy usage by heating, ventilation, and air conditioning systems. Free cooling is a good option for energy savings in the systems. In recent years, scientists, engineers, and architects designed successful and innovative buildings which use passive cooling techniques, such as natural ventilation. The house studied in the present work, is a pilot project undertaken jointly by the Centre for Development of Renewable Energies (CDER) and the National Centre for Studies and Research of the integrated building (CNERIB) in the framework of the MED-ENEC project (Mediterranean Energy Efficiency in Construction structure). The house under consideration has a surface area of 65 m2 and is located in the region of Algiers which characterized by a Mediterranean climate with relatively mild winters and a hot and humid summer. The aim of this work is to study the thermal comfort inside the house in summer without air conditioning systems, only ventilation is considered. The aim of this work is to study the effect of natural ventilation on both thermal and hygrometric comfort inside the house during the summer period. Numerical simulation is made using the TRNSYS software and the results obtained are in good agreement with measured values. The prototype home is designed in a way that natural ventilation allows thermal comfort which induced energy saving from air conditioning. The mean temperature measured in the interior of the house is 26?C. The relative humidity reaches about 70% in August. Thermal comfort is related to relative humidity that are the essential parameters of the feeling of comfort. Humidity is an important parameter in thermal comfort, it is why we can conclude that we have reached a relatively good hygrothermal comfort.

scholarly journals Apprehending Air Conditioning Systems in Context to COVID-19 and Human Health: A Brief Communication

2020 ◽  
Vol 07 (01) ◽  
pp. 28-30
Author(s):  
Shalom Akhai ◽  
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Hvac Systems ◽  
Air Conditioner ◽  
Human Beings ◽  
Human Race ◽  
Question Mark ◽  
Air Conditioners ◽  
Current Article ◽  
Air Conditioning Systems

Nowadays human race which is strongest of all creatures on the planet is frightened to move out without precautions because of coronavirus. In the current article, a brief overview of the use of air-conditioners available in different designs is addressed in context to COVID-19. Since this virus is often transmitted by exhalations from infected airways, so Heating, Ventilation and Air-Conditioning (HVAC) systems may be important to enhance or mitigate the spread of the infection in indoor dwellings. The design of the building is directly related to the airflow through the structure of the building. One of the biggest problems that is mushrooming out of this crisis is the use of air-conditioners. The air-conditioners produce artificial built environment, which in some cases may not be good for human beings. But at home for attaining thermal comfort, it remains a question mark, whether building architecture using air-conditioner is safe or not. The paper herein tries to co-relate the literature available for providing a brief communication to these questions.

Phenomenon of Radiation Asymmetry in The Capillary Plane Air-Conditioning Systems

2013 ◽  
Vol 671-674 ◽  
pp. 2555-2558
Author(s):  
Yong An Li ◽  
Hao Gu ◽  
Xue Lai Liu ◽  
Chuan Yang Zhao
Keyword(s):  
Mathematical Model ◽  
Human Body ◽  
Air Conditioning ◽  
Engineering Practice ◽  
Occupant Comfort ◽  
South Wall ◽  
North Wall ◽  
Air Conditioning Systems ◽  
Different Parts ◽  
Radiation Angle

Based on the introduction characteristics of capillary plane radiation air conditioning systems, we focuse on the analysis phenomenon of radiation asymmetry in the radiant air conditioning systems in the engineering practice , and discuss the condition that produces this phenomenon, and establish mathematical model of radiation asymmetric in the capillary plane air conditioning systems. And we work out the radiation angle coefficient between the human body and the floor, south wall, north wall, east wall , west wall in air conditioning rooms, and expound the radiation asymmetry degree in different parts of air conditioning rooms. The result is of positive significance to research capillary plane radiation air conditioning systems deeply and to improve occupant comfort .

Energy and Exergy Analysis of an Air Conditioning System Using the Mixture of Outdoor and Return Air

2012 ◽  
Author(s):  
A. Kilicarslan ◽  
I. Kurtbas
Keyword(s):  
Heat Transfer ◽  
Relative Humidity ◽  
Air Conditioning ◽  
Exergy Analysis ◽  
Computer Code ◽  
Exergy Destruction ◽  
Moist Air ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Air Conditioning Systems

Energy and exergy analysis of the air conditioning systems employing the mixture of outdoor and return air (ACOR) are presented. The equations of heat transfer rate and exergy destruction are developed for ACOR according to the system parameters of moist air and condensate water. The effects of the incoming air dry bulb temperature to the coil and relative humidity, and leaving air dry bulb temperature from the coil on the heat transfer and exergy destruction are investigated by means of a computer code developed. The heat transfer from the air to the coil increased as the incoming air dry bulb temperature and relative humidity increased while the heat transfer decreased with the increase in the leaving air dry bulb temperature. The exergy destruction of the moist air increased as the incoming air dry bulb temperature increased, but it decreased with the increasing values of incoming air relative humidity values.

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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