Iterative substructuring methods for incompressible non-isothermal flows and its application to indoor air flow simulation

2002 ◽  
Vol 40 (12) ◽  
pp. 1527-1538 ◽  
Author(s):  
T. Knopp ◽  
G. Lube ◽  
R. Gritzki ◽  
M. Rösler
Keyword(s):  
Indoor Air ◽  
Air Flow ◽  
Flow Simulation ◽  
Iterative Substructuring ◽  
Isothermal Flows ◽  
Indoor Air Flow

Application of domain decomposition methods to indoor air flow simulation

2008 ◽  
Vol 85 (10) ◽  
pp. 1551-1562 ◽  
Author(s):  
G. Lube ◽  
T. Knopp ◽  
R. Gritzki ◽  
M. Rösler ◽  
J. Seifert
Keyword(s):  
Domain Decomposition ◽  
Indoor Air ◽  
Air Flow ◽  
Flow Simulation ◽  
Decomposition Methods ◽  
Domain Decomposition Methods ◽  
Indoor Air Flow

Indoor air flow analysis based on lattice Boltzmann methods

2002 ◽  
Vol 34 (9) ◽  
pp. 941-949 ◽  
Author(s):  
B Crouse ◽  
M Krafczyk ◽  
S Kühner ◽  
E Rank ◽  
C van Treeck
Keyword(s):  
Indoor Air ◽  
Lattice Boltzmann ◽  
Air Flow ◽  
Flow Analysis ◽  
Lattice Boltzmann Methods ◽  
Indoor Air Flow

Simulation of Indoor Air Flow Fields in Buildings With Large Interior Spaces With Stratified Air Conditioning and Perforated Side Wall Diffusers

2010 ◽  
Author(s):  
Bing Wei ◽  
Li Zhang
Keyword(s):  
Energy Consumption ◽  
Flow Field ◽  
Energy Conservation ◽  
Indoor Air ◽  
Air Conditioning ◽  
Air Flow ◽  
Side Wall ◽  
Flow Fields ◽  
Flow Mode ◽  
Indoor Air Flow

The energy consumption of AC (air conditioning) systems in large buildings is normally higher than the energy consumption in smaller buildings, and its indoor air flow field is also more complex than that in small building. To study the air flow mode and the indoor air flow fields in large spaces is of great significance to the energy conservation of AC systems and thermal comfort of the occupants. This paper presents an example using a large building that uses stratified air conditioning delivered through the linear slot sidewall diffusers and perforated sidewall diffusers. Using CFD simulation methods, three air flow field situations were simulated: (1) total air volume supplied from linear slot diffusers located in the middle of a side wall, (2) 50% flow through the linear slot diffusers the remainder supplied through the perforated sidewall diffusers, (3) 30% of the volume supplied with linear slot diffusers, 70% supplied through the perforated sidewall diffusers. The simulated results show that the third airflow mode is the optimal one for the three modes, which is good for achieving energy conservation and a comfortable building thermal environment in buildings with large spacial areas.

EML Thoron Gas Measurements

1994 ◽  
Vol 56 (1-4) ◽  
pp. 263-266 ◽  
Author(s):  
E.O. Knutson ◽  
A.C. George ◽  
P. Shebell ◽  
C.V. Gogolak
Keyword(s):  
Indoor Air ◽  
Air Flow ◽  
The Other ◽  
Coincidence Method ◽  
Flow Paths ◽  
Filter Tube ◽  
Current Measuring ◽  
Low Levels ◽  
Gas Measurements ◽  
Indoor Air Flow

Abstract The Environmental Measurements Laboratory's experience with two methods of measuring thoron gas, and its findings on the feasibility of using these measurements to diagnose indoor air flow paths, are presented. One method is an updated version of the two-filter tube, and the other is a modified Falk-More-Nyblom delayed coincidence method. Measurements made with these instruments in six houses indicated that thoron concentrations are very low (median about 11 Bq.m-3); this is consistent with values previously reported for US housing. Both methods had difficulty measuring these low levels, particularly in houses with high radon gas levels. At one house, thoron levels measured outdoors over bare earth were higher than indoor levels. At the low levels encountered and with the current measuring technology, it seems unlikely that thoron gas measurements can be used to trace indoor air motion.

scholarly journals The effect of evaporative cooling on climatic parameters in a stable for sows

2014 ◽  
Vol 60 (Special Issue) ◽  
pp. S85-S91 ◽  
Author(s):  
Ľ. Botto ◽  
J. Lendelová ◽  
A. Strmeňová ◽  
T. Reichstädterová
Keyword(s):  
Flow Velocity ◽  
Indoor Air ◽  
Cooling System ◽  
Air Flow ◽  
Evaporative Cooling ◽  
Apparent Temperature ◽  
Climate Index ◽  
Pressure System ◽  
Indoor Air Flow ◽  
Air Flow Velocity

The aim of this study was to find out the effect of indirect evaporative cooling on microclimatic parameters in a stable for sows. A high-pressure system was used for cooling, the nozzles sprayed water into the outside air before its entering into the building. Temperature-humidity index during cooling was higher by 0.9 than in the section without cooling (P < 0.001). Due to low indoor air flow velocity (below 0.18 m/s), a change in apparent temperature by the Comprehensive Climate Index (CCI) was only 1.94°C. It would be possible to provide markedly better cooling effectiveness by increasing the air velocity up to 2 m/s, which may improve the CCI by 19.8% and thus to achieve better environmental conditions for housed sows. The efficiency of evaluated evaporative cooling system was moderate because the nozzles were placed outdoors and only part of humidified and cooled air was drawn into the building through inlet openings, and also because the indoor air-flow velocity was low.

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