Expansion Tank Structural Reconstruction for Central Heating Systems With Re-Engineering Consideration and Energetic Losses Minimization

2015 ◽  
Author(s):  
Hamed Mohsenian ◽  
Hossein Ghadamian ◽  
Ali Asghar Hamidi ◽  
Karim Alizad
Keyword(s):  
Air Conditioning ◽  
Experimental Models ◽  
Efficient Design ◽  
Heating Systems ◽  
Central Heating ◽  
Proposed Model ◽  
Energy Auditing ◽  
Proper Design ◽  
Air Conditioning Systems ◽  
Energy Survey

Open expansion tanks are applied vastly in central heating and air-conditioning systems. Central heating systems are subjected to great deals of energy losses, owing to the lack of proper design. In this paper, the structure of Open Expansion Tanks is revised and some modifications for reducing energy and heat loss are made to their elements. Moreover, some common designs available in the market are studied in order to better recognize their defects and capabilities. To reach an efficient design, several scenarios are tested using Computational methods (CFD based). In order to validate the new design, an experimental model was created and heat and energy survey operations were performed. The results of energy auditing were analyzed to show the convergence of numerical and experimental models. Additionally, the proposed model was economically evaluated. The final presented model named “Optimized OET with twin containers” is capable of reducing the energy loss by 85 to 95 percent.

scholarly journals Assessing the Environmental Impact of Thermal Transmittance Tests Performed in Façades of Existing Buildings: The Case of Spain

2020 ◽  
Vol 12 (15) ◽  
pp. 6247
Author(s):  
David Bienvenido-Huertas
Keyword(s):  
Energy Consumption ◽  
Environmental Impact ◽  
Thermal Gradient ◽  
Air Conditioning ◽  
Experimental Methods ◽  
Existing Buildings ◽  
Heating Systems ◽  
Thermal Transmittance ◽  
Test Conditions ◽  
Air Conditioning Systems

Thermal transmittance tests constitute an appropriate tool to assess the energy performance of existing buildings. The heat flow meter method and the thermometric method are the most used experimental methods. One of the main criteria to guarantee appropriate test conditions and the representation of results is to ensure a high thermal gradient. For this purpose, heating or air conditioning systems should be used from three to seven days. Most studies related to experimental methods have addressed the appropriate test conditions; however, the environmental impact related to these conditions have not been analyzed. This study analyzes the energy consumption and the CO2 emissions related to the conditions of the thermal gradient required for tests. An energy analysis of 129,600 cases located in Spain was conducted. The results showed that heating systems are the best option to perform thermal transmittance tests, whereas air conditioning systems do not guarantee appropriate test conditions. As for the energy consumption and the percentage of hours with an appropriate thermal gradient, the adequacy of the heating setpoint temperature according to the predicted estimations of the external temperature during tests would mitigate their environmental impact. The reason is that, in certain cases, the increase of the setpoint temperature does not improve test conditions. Also, the use of heating systems would imply short test durations. Finally, the selection of small rooms with a small façade length would reduce the percentage of CO2 emissions between 31.37% and 36.1%. The results of this study could guarantee a more sustainable performance of thermal transmittance tests. In addition, the results could be used to perform life cycle analysis on buildings where thermal transmittance tests are performed.

scholarly journals An Intelligent Feedback Controller Design for Energy Efficient Air Conditioning System

2020 ◽  
Vol 2 (3) ◽  
pp. 168-174
Author(s):  
P. Hengjinda ◽  
Dr. Joy Iong Zong Chen
Keyword(s):  
Energy Consumption ◽  
Air Conditioning ◽  
Controller Design ◽  
Comfort Level ◽  
Sensor Data ◽  
Air Conditioner ◽  
Human Comfort ◽  
Air Conditioning System ◽  
Proposed Model ◽  
Air Conditioning Systems

Air conditioning systems were invented to improve human comfort in a room or hall. An efficient air conditioner systems are always needed to minimize the power consumption. There are several settings with lot of control devices were introduced in the past years to achieve minimal energy consumption rate. Those control systems were minimized the energy consumption to certain limit without considering human comfort. The proposed model is designed to minimize the energy consumption with maximum human comfort. Several sensor modules were introduced in the model to predict human comfort level in a room or hall. The sensor data are taken as feedback to the air conditioning system for attaining maximum human comfort level. The proposed design is verified with energy consumption calculation and change in room temperature measurements.

Bath Central Heating and Air Conditioning Systems Economic Analysis

2014 ◽  
Vol 852 ◽  
pp. 745-748
Author(s):  
Jin Gang Yang
Keyword(s):  
Air Conditioning ◽  
System Management ◽  
Management Service ◽  
Air Conditioning System ◽  
Service Effectiveness ◽  
Central Heating ◽  
Operation Costs ◽  
Cold Source ◽  
Source Program ◽  
Air Conditioning Systems

According to the building to its own characteristics, functions, and local circumstances existing cold source author believes that the heating and air conditioning system to determine which technology lies cold and heat source and system solutions optimize indoor hot and cold source program will directly greatly affect the project's initial investment and operation costs and system management service effectiveness.

THE CREATION OF THE COMFORTABLE MICROCLIMATE IN THE HOTEL-TYPE BUILDINGS

2021 ◽  
Author(s):  
Анатолий Петрович Зыков ◽  
Александр Владимирович Барков
Keyword(s):  
Air Conditioning ◽  
Central Heating ◽  
The Creation ◽  
Air Conditioning Systems

Создание оптимального микроклимата в зданиях является важной составляющей формирования комфортных условий пребывания человека в гостинично-ресторанных комплексах. В статье были рассмотрены особенности обеспечения и поддержания комфортных параметров воздуха с помощью систем отопления, вентиляции и кондиционирования на указанных объектах. The creation of an optimal microclimate in buildings is an important component of the formation of comfortable conditions for the guests in hotel complexes. The article considered the features of ensuring and maintaining comfortable air characteristics that are achieving by the using of central heating, ventilation and air conditioning systems in hotel complexes

An Economic Comparison between Two Types of Heating and Air-Conditioning Systems for Public Buildings in Severely Cold Regions

2013 ◽  
Vol 671-674 ◽  
pp. 2507-2510
Author(s):  
Shou Hong Ren ◽  
De Ying Li
Keyword(s):  
Energy Conservation ◽  
Air Conditioning ◽  
Heating System ◽  
Public Buildings ◽  
Cold Regions ◽  
Air Conditioning System ◽  
Public Building ◽  
Central Heating ◽  
Air Conditioning Systems ◽  
Economic Comparison

The overall cost of the cooling type air-conditioning plus central heating system is less than that of the all-season air conditioning system in life spans of the two types of systems, which demonstrates the applicability of the principle on design of heating, ventilation and air-conditioning in chapter 5 of Standards of Design for Energy Conservation for Public Building, which suggests that the central heating system should be adopted instead of the air-conditioning system for public buildings in severely cold regions.

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.

Sign in / Sign up

Export Citation Format

Share Document