scholarly journals THE ANALYSIS OF APPLYING DIFFERENT COOLANTS FOR COOLING SYSTEMS IN THE OFFICE BUILDING / SKIRTINGŲ ŠILUMNEŠIŲ VĖSINIMO SISTEMŲ TAIKYMO BIURŲ PASTATE ANALIZĖ

2011 ◽  
Vol 3 (5) ◽  
pp. 105-111
Author(s):  
Rasa Kanapienytė ◽  
Kęstutis Čiuprinskas
Keyword(s):  
Sensitivity Analysis ◽  
Air Conditioning ◽  
Office Buildings ◽  
Office Building ◽  
Operating Costs ◽  
Air Cooling ◽  
Electricity Prices ◽  
Cooling Systems ◽  
Energy Expenditures ◽  
Air Conditioning Systems

The paper analyzes air conditioning systems of different coolants on the basis of an example of a typical office building. Depending on the type of a coolant fan coil unit, active chilled beams, variable refrigerant volumes and air cooling systems were designed. The article suggests hydraulic and aerodynamic calculations and evaluates initial investments, energy expenditures and operating costs of the compared systems. Considering economic calculations, the pay-back time of the systems was assessed and the sensitivity analysis of electricity prices was carried out. The results of the conducted investigation show the most appropriate analysed system for office buildings taking into account the efficient use of electricity and initial investments. Santrauka Tipinio administracinio pastato pavyzdžiu nagrinėjamos skirtingų šilumnešių vėsinimo sistemos. Atsižvelgiant į šilumnešio tipą suprojektuotos ventiliatorinių konvektorių, aktyviųjų šalčio sijų, freoninė ir orinė vėsinimo sistemos. Atlikti hidrauliniai ir aerodinaminiai skaičiavimai, įvertintos sistemų pradinės investicijos, apskaičiuotos energijos sąnaudos ir eksploatacijos išlaidos. Ekonominio skaičiavimo metu buvo įvertintas sistemų atsipirkimo laikas ir atlikta elektros kainų jautrumo analizė. Šio tyrimo rezultatai rodo, kokia sistema yra tinkama biurų pastatams pagal efektyvų elektros energijos naudojimą ir pradines investicijas.

scholarly journals An approach for reducing the air conditioning costs in office buildings in Vietnam

2021 ◽  
Vol 327 ◽  
pp. 01012
Author(s):  
Van Hung Tran ◽  
Thanh Nhan Phan ◽  
Momchil Vassilev
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Office Buildings ◽  
Office Building ◽  
Operating Costs ◽  
Air Conditioning System ◽  
Cost Of Electricity ◽  
Electricity Costs ◽  
Air Conditioning Systems ◽  
The Cost

According to statistics from the Ho Chi Minh Energy Saving Center, the electricity costs of the air conditioning system for office buildings are about 70% of the electricity costs. There are many solutions that have been proposed to reduce the operating costs of the air conditioning systems, this article discusses a method of accumulating cold to reduce the cost of electricity for the air conditioning system of an office building.

scholarly journals Feasibility study for the use of variable air volume systems for office buildings

2021 ◽  
Vol 36 ◽  
pp. 62-79
Author(s):  
A. Moskvitina ◽  
M.  Shyshyna ◽  
M. Korchminskyi
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Carbon Dioxide Emissions ◽  
Air Conditioning ◽  
Office Buildings ◽  
Operating Costs ◽  
Gas Emissions ◽  
Variable Air Volume ◽  
Air Volume ◽  
Air Conditioning Systems

The main factor contributing to greenhouse gas emissions is the building up of the surrounding area. Studies have shown that buildings globally consume 30-40 % of energy use and release 40-50 % of global carbon dioxide emissions. Among all systems in houses, heating, ventilation and air conditioning (HVAC) systems are by far the most energy intensive. They consume approximately 50 % of the total energy demand of buildings. However, the systems are some of the most important systems in today's buildings. The number of these systems that are being installed has increased dramatically over the past few years. This is mainly due to the increasing demands for thermal energy, comfort and climate change. This paper presents a feasibility and ecology study between two ventilation or air-conditioning systems: constant air volume (CAV) and variable air volume (VAV). One of the purposes of this work is to determine the energy costs for each of the systems. An air conditioning system that saves operating costs usually requires a large initial investment. In this case, engineers must decide whether it is worth paying the additional upfront costs for a system that has lower operating costs. Despite the low attractiveness from the point of view of the investor, the VAV systems reduce the amount of greenhouse gas emissions and the amount of energy resources for servicing the commercial sector. Such system have less metal consumption. Thus, the cost of metal processing is also reduced. The results of this study can contribute to the future selection of ventilation systems, as well as contribute to the design and improvement of the systems under study. Energy saving is one of the main reasons why VAV systems are very popular today for the design of ventilation and air conditioning systems for office buildings and in many industries abroad. With these systems, the volume of transported air is reduced as soon as the operating load falls below the maximum projected load. The calculation of emissions of harmful substances into the environment was made while ensuring the operation of CAV and VAV systems.

Thermal Analysis of Low-Cost Dwellings in Mexico Using Greenroofs

2011 ◽  
Author(s):  
Mari´a G. Alpuche ◽  
Irene Marincic ◽  
Jose´ M. Ochoa ◽  
Hugo C. Moreno ◽  
Paloma Giottonini
Keyword(s):  
Energy Consumption ◽  
Air Conditioning ◽  
Low Cost ◽  
Concrete Block ◽  
Building Envelope ◽  
Air Cooling ◽  
Design Strategies ◽  
Cooling Systems ◽  
Air Conditioning Systems ◽  
Electricity Energy Consumption

According to the National Energy Balance (1), the electricity consumption in the residential and commercial sector represents thirty-three percent of the total consumed in the country. Most of the energy is consumed during the summer, when it is necessary to use air conditioning to maintain comfort conditions inside buildings. This aspect takes relevance in warm-dry climates, where a deficient design of building envelope and a wrong location of windows can increase the thermal loads producing an extra load to air conditioning systems and high costs by electricity energy consumption. For this reason, adequate design strategies and thermodynamic concepts have to be applied in order to make dwellings comfortable. Two dwellings are simulated and analyzed, the first one is made of regional materials like traditional concrete block walls, reinforced concrete roofs and economic finishes, the second one is proposed with a green roof and insulation in walls. The heat gains through the different constructive elements have been obtained, to analyze their impact on global thermal comfort and the electricity energy consumption of air cooling systems. Also, an exergy analysis has been applied to analyze exergy efficiency of air cooling systems and the influence that the building envelope can have in them with the proposed changes. The minimum exergy expenditure of air conditioning systems required to achieve comfort conditions inside dwellings could be a useful benchmark for the comparison of various dwelling designs.

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.

The study of solar absorption air-conditioning systems

2005 ◽  
Vol 16 (4) ◽  
pp. 59-66 ◽  
Author(s):  
V Mittal ◽  
KS Kasana ◽  
NS Thakur
Keyword(s):  
Air Conditioning ◽  
Lithium Bromide ◽  
Cooling Systems ◽  
Solar Absorption ◽  
Air Conditioning System ◽  
Heating And Cooling ◽  
Absorption Cooling ◽  
Solar Powered ◽  
Solar Absorption Cooling ◽  
Air Conditioning Systems

An air-conditioning system utilizing solar energy would generally be more efficient, cost wise, if it was used to provide both heating and cooling requirements in the building it serves. Various solar powered heating systems have been tested extensively, but solar powered air conditioning systems have received very little attention. Solar powered absorption cooling systems can serve both heating and cooling requirements in the building it serves. Many researchers have studied the solar absorption air conditioning system in order to make it economically and technically viable. But still, much more research in this area is needed. This paper will help many researchers working in this area and provide them with fundamental knowledge on absorption systems, and a detailed review on the past efforts in the field of solar absorption cooling systems with the absorption pair of lithium-bromide and water. This knowledge will help them to start the parametric study in order to investigate the influence of key parameters on the overall system performance.

scholarly journals Comparison of Different Solar-Assisted Air Conditioning Systems for Australian Office Buildings

Energies ◽  
2017 ◽  
Vol 10 (10) ◽  
pp. 1463 ◽  
Author(s):  
Yunlong Ma ◽  
Suvash Saha ◽  
Wendy Miller ◽  
Lisa Guan
Keyword(s):  
Air Conditioning ◽  
Office Buildings ◽  
Air Conditioning Systems

scholarly journals Possibilities of using solar energy in the processes of cooling external zones of people

2018 ◽  
Vol 49 ◽  
pp. 00016
Author(s):  
Ewelina Dec ◽  
Robert Sekret ◽  
Bożena Babiarz
Keyword(s):  
Solar Energy ◽  
Radiation Energy ◽  
Air Cooling ◽  
Cooling Systems ◽  
Maximum Daily Temperature ◽  
Air Temperatures ◽  
Technical Potential ◽  
Hot Days ◽  
Hot Weather ◽  
Air Conditioning Systems

Meteorological analyzes unambiguously indicate climate warming. An increase in average air temperatures is recorded in both winter and summer. In recent years, an increasing number of hot and very hot days are observed, and the duration of series of days with maximum daily temperature above 30°C is also longer. Occurrence of hot weather adversely affects the person staying outside. The ever-increasing requirements related to thermal comfort, enforce the provision of appropriate conditions not only in the rooms, but also in the external zones of people. Cooling the air in outdoor zones using standard air-conditioning systems can be expensive due to the high demand for electricity. Ensuring cooling through the use of renewable energy, such as solar energy, is a key solution to energy and environmental problems. In this article, the technical potential of solar radiation energy was determined based on data from the Rzeszow- Jasionka meteorological station and the possibilities of using solar energy in air cooling systems in external zones were presented.

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