Detection and Analysis of Microbial Contamination in Central Air Conditioning System of a University

2012 ◽  
Vol 610-613 ◽  
pp. 661-664
Author(s):  
Hui Xing Li ◽  
Bei Ni Li ◽  
Geng Geng ◽  
Wei Xiao ◽  
Wei Wang
Keyword(s):  
Air Conditioning ◽  
Microbial Contamination ◽  
Ventilation System ◽  
Inner Product ◽  
Public Places ◽  
Air Conditioning System ◽  
Surface Dust ◽  
Photo Catalysis ◽  
Air Ventilation ◽  
Central Air Conditioning

Objective: Test the wind pipe dust and microorganism pollution status in the central air conditioning system of public buildings in the teaching area.Analysis of microbial pollution of the related factors.Methods:Sampling 6 functionally different area in the teaching building,using the microbiology analysis method on air conditioning system of blower tube surface dust pollution of microorganism detection,and the use of TiO2 photo catalyst purification mechanism on microbial contamination control.Results:on the basis of"centralized air ventilation system in public places sanitary specification",teaching areas of central air conditioning system of dust amount met the requirement basically.Bacterial concentrations generally beyond the standard,fungal concentration accords with the standard.The Method using TiO2 photo catalysis sterilization was proposed. Conclusion:Teaching of regional air conditioning pipe inner product dust weight is relatively large.Microbial pollution is serious.It is necessary that cleaning air conditioning system timely and using TiO2 Photocatalyst purification mechanism for killing air duct surface dust microorganism.

Investigation and Research of Biological Contamination of HVAC in Public Places

2011 ◽  
Vol 250-253 ◽  
pp. 2719-2722
Author(s):  
Xin Li ◽  
Ya Wei ◽  
Liang Li
Keyword(s):  
Public Health ◽  
Air Conditioning ◽  
Ventilation System ◽  
Cooling Water ◽  
Public Places ◽  
Biological Contamination ◽  
Central Air Conditioning ◽  
Normal Method ◽  
Number Of Bacteria ◽  
Public Health Standard

According to the normal method for sampling in the appendix of “The Central Air-Conditioning Ventilation System of Public Health Standard” by the ministry of health in 2006 were the HVAC on-site examined and sampled. The examined indicators include: total number of bacteria, fungus and beta Streptococcus in air supplied outlet, Legion Ella pneumophila in cooling water, the quantity of dust and microbe amounts to each square meter pipeline surface area and other sanitation indexes.

Optimization of Thermal Stability of Atrium Based on Computational Modeling

2016 ◽  
Vol 861 ◽  
pp. 353-360
Author(s):  
Aleš Rubina ◽  
Pavel Uher ◽  
Petr Blasinski
Keyword(s):  
Thermal Stability ◽  
Air Conditioning ◽  
Computer Modelling ◽  
Ventilation System ◽  
Air Conditioning System ◽  
Indoor Space ◽  
Central Air Conditioning ◽  
And Performance ◽  
Thermal Stability Of ◽  
Occupied Zone

The article deals with analysis of the heat balance and temperature microclimate of indoor space of a four-storey building atrium. With regard to the anticipated thermal loads in all functionally connected rooms, investor made a request to verify the thermal stability of the atrium before the implementation stage. Atrium and adjacent rooms are a geometrically complicated inner space which cannot be solved by analytical methods to ensure the required temperature conditions in occupied zone. This led to the creation of a mathematical model of the atrium with the current project solution. The result of the simulation of the existing solutions is that there is not complied desired air temperature in the occupied zone. For this reason, it was developed optimization of existing variant. Optimization was performed in steps as changing temperature of the central air conditioning system, changing number of units and performance of local refrigeration air conditioning. The conclusion of this paper is to evaluate the thermal profiles of temperature stratification in the atrium area and request the required cooling performance of the ventilation system. The article attempts to use computer modelling as a tool for the placement and performance design of ventilation equipment.

A Central Air Conditioning System Design for Guesthouse in Changsha City

2012 ◽  
Vol 170-173 ◽  
pp. 2431-2436
Author(s):  
Yun Fan Zeng ◽  
Min Hui Zhang
Keyword(s):  
Air Conditioning ◽  
Ventilation System ◽  
Water System ◽  
Exhaust System ◽  
Air Conditioning System ◽  
Cold Source ◽  
Electric Boiler ◽  
Central Air Conditioning ◽  
Reliability Of Operation ◽  
Process Energy

This article presents the design of the air conditioning system in the building. In the project, ice storage for cold source and electric boiler thermal storage for heat source are taken while variable primary flow is used for water system. Taking into account the functions of each part, all air and fan coil unit with fresh air system are applied in ventilation system. The design of air exhaust system is introduced. A detail scheme about the annual operational regulation for energy saving is proposed. During the designing process, energy conservation is given enough attention, and the reliability of operation is also ensured.

Application Study of Load Forecasting of Central Air-Conditioning System Based on Time Sequence Analysis Method

2012 ◽  
Vol 220-223 ◽  
pp. 622-625
Author(s):  
Xue Li Zhu ◽  
Bo Dong ◽  
Yong Jun Zhu
Keyword(s):  
Sequence Analysis ◽  
Air Conditioning ◽  
Time Lag ◽  
Load Forecasting ◽  
Time Sequence ◽  
Analysis Method ◽  
Air Conditioning System ◽  
Central Air Conditioning ◽  
Heating Load ◽  
Time Sequence Analysis

With the characteristics of non-stationarity, non-linearity, time-lag of refrigeration/ heating supplying in minds, load forecasting of central air-conditioning system is carried using time sequence analysis method. Firstly, acquisition sample data of central air-conditioning system is pretreated, and random time sequence AR model of system is formulated. Then, forecasting of AR refrigeration/heating load based on Yule-walker method is conducted. In order to enhance forecasting accuracy, crossover forecasting is introduced into the load forecasting, that is, to use vertical forecasting to follow household demands for load and horizontal forecasting to track changes of weather. Then, weight cross is made to vertical and horizontal forecasting results. Finally, refrigeration/heating load forecasting software of central air-conditioning system is developed, which is used in energy-saving monitoring and control of central air-conditioning system.

Sign in / Sign up

Export Citation Format

Share Document