Estimation of Pollutant Dispersion from A Stack by CFD Analysis
Dispersive transport takes place as a dispersed phase moves into a continuous phase available in its surroundings. The dispersion of pollutants from a flue gas stack is one such phenomena. Pollutant dispersion studies are mandatory for regulatory requirements. Hazardous gases, when emitted into the atmosphere for a long period of time can cause severe detrimental Continue reading
CFD in Air Cooled Condensers
Air-conditioning systems work on principle of vapor compression cycle with refrigerant as the working fluid. Condensers are part of air-conditioning systems those facilitate heat rejection from hot refrigerant fluid to ambient. Few benefits of CFD will be discussed while describing key parameters affecting performance of air-cooled condensers of split ACs and central air conditioning.The outdoor Continue reading
CFD Analysis of Duct Flows and Mitigation of Flow Induced Vibration
Flow frequencies in a duct flow if in-phase with structural eigen frequencies, can cause severe vibrations. Reduction or complete elimination of such flow induced vibrations might not even require major structural modifications! The basic question to be pondered about is how the frequencies are generated in a flow. The cause of a frequency in flow Continue reading
CFD Analysis of Diesel Generator (DG) Housing
Diesel engines dissipate heat during electric energy generation and a sufficiently ventilated space is required to keep the temperature within threshold. Heat is removed from the generator set by inducing flow with fans. The fan flow is obstructed primarily due to diesel engine and generator. Some minor resistance to the flow is offered due to Continue reading
CFD Analysis of Cyclone Separators
Cyclone separators are prevalent in process industries for separating oil droplets or dust particles from gases. These work on the principle that centrifugal force on a particle is proportional to its mass. So higher the mass, higher the centrifugal force. In cyclones, gas enters tangentially and produces a swirl motion. Due to the swirl higher Continue reading
Fire and smoke simulation in high-rise buildings
Fire in a high rise building is the worst nightmare of any occupant because of its destructive nature to cause property loss as well as human causalities. Fire along with its companion smoke causes lot of destruction to human habitat. Smoke contains toxic gases which upon inhalation can cause issues depending on the concentration of Continue reading
CFD Analysis of Warehouse
Warehouses store goods for considerable time. HVAC systems and distributions should be carefully designed for larger spaces as they have energy implications also. In large warehouses an under sized HVAC system makes the work environment tiresome. The areas of human movement should be comfortable. A Storage containing fabrics and related products may emit odor in Continue reading
CFD analysis for a transformer room
Electric substations use transformers to step up or step down voltage. In Gulf countries like Saudi Arabia, where dust storms are prominent, transformers are kept inside a room with perforated walls and roofs. The transformers generate a lot of heat due to various losses. For small transformers losses are less hence air circulation keeps the Continue reading
CFD analysis of stacked condensers in a high-rise apartment
Ductable air conditioning systems generate good amount of heat owing to their higher capacities. In a high-rise apartment where such systems are used the ambient air temperature near the out door condenser unit (ODU) rises due to heat rejection. A gravity driven flow is expected because of density variations resulting from high temperatures. If the Continue reading
CFD Analysis of Data Center
Data centers are high energy consuming facilities. The server racks with CPUs should be properly conditioned else CPU speeds would be much lesser than its rated value. Better air conditioning of spaces in a data center would also have considerable energy savings. Cold and hot aisles for supply and return air segregation is a common Continue reading
Dynamic thermal modeling of warehouse
Warehouses spread over a large area have higher energy consumption. The biggest portion of the energy consumption is due to the HVAC systems. ASHRAE recommendations based HVAC system designs can be improved based on hourly energy needs. Weather conditions affect solar heat gains and infiltration loads. Nearby structures may cast shadow on the facility, blocking Continue reading
CFD Analysis of HVAC Duct
Supply air from AHU’s are carried to diffusers through ducts. The area of duct depends on volume flow rate. Starting from the AHU a cross-section reduction is preferred for the ducts, so that velocity will be maintained even at increased distance from the AHU. Besides flow rate, pressure drop is another parameter for duct design. Continue reading
Energy efficient building design : energy modeling & analysis
Energy efficiency of buildings, more particularly for the commercial establishments, is a very important aspect of facility-design. Energy cost is a major contributor to the operational expenditure of a building. Hence, any step to improve the energy efficiency, pays back as huge energy cost saving, also reducing the carbon foot-print. Energy modeling is a tool, Continue reading
Green approach of building design: natural ventilation
Designing a proper ventilation system is integral to building & facility planning, because it is has direct impact on safety and health of the occupants. Also, an environment friendly building with proper ventilation system reduces the energy cost significantly . The principal goal of a ventilation unit is to provide thermal comfort and good indoor Continue reading