Under normal conditions the cooling water ratio to vapour condensed in around 50 to 60 for barometric condensers, 60 to 70 for Multi jet condensers and 40 to 50 for single entry type condensers. In the next revision of this article will provide online calculation sheet of condenser design. Sep 04, 2020 Condenser Design. Shell and Tube Condenser Design (CnD) is a software that is made to demonstrate thermal analysis and design calculations required for designing shell and tube condensers. This software can design, horizontal shell side condensers, horizontal tube side condensers, vertical shell side condensers, vertical tube side condensers.
CONDENSER DESIGN Condensation on horizontal tubes (Nusselt theory) Heat transfer coefficient is obtained by h=0.728[kL3 ϸL(ϸL- ϸV)g ƛ /µL (Tv –TW) D] Where kL – thermal conductivity of liquid ϸL – density of liquid ϸV –density of vapour ƛ – latent heat of condensation of steam g- Gravitational acceleration =9.81m/s2 µL – viscosity of liquid TW – temperature of surface Tv –temperature of vapour D –diameter The above eqn applies for a single tube or single row of tubes. When tubes are stacked over each other the heat coefficient is calculated as H=h NR-1/6 Nr- no of rows of horizontal tubes
As the properties(kL, ϸL, µL) of the condensate changes with the temperature ,so some modifications are being done to compensate for that . Tf =βTw +(1- β)Tsat Where β-weight factor (recommended in the literature from 0.5 to 0.75) Condensate sub cooling The temp in the condensate film drops from Tsat at the liquid vapour interface to Tw at the wall. Therefore the avg condensate temperature, TL is less than Tsat, and hence the condensate leaving the surface is sub cooled. Accounting for sub cooling, the rate of heat transfer is Q=W ƛ +WCp,L (Tsat - TL)= Whfg*
Cp,L heat capacity of condensate W- condensation rate to account for both sub cooling and inertial effects h/hNu =(1+(0.683 -0.228 PrL-1)Ԑ)^0.25 hNu - heat transfer coeff by basic nusselt theory Ԑ- Cp,L (Tsat - Tw)/ƛ PrL - Cp,L µL/ kL above eqn is valid for Pr>0.6 Q=NhD0L∏(Tsat - Tw) Tw=…………… Then Tf can be obtained by the eqn given above Mass flow rate of water =ϸAu U –flow velocity A of tube can be calculated from the above eqn And the total area= N∏DL And the condensation rate –Q/hfg* Some FACTS to remember
In drop wise condensation Heat transfer coefficient is considerably high as compared to film condensation. The reason being the direct contact of vapor with the cooler surface. The effectiveness of a condenser can be calculated as (1 - eNTU) NTU=(UA/Cmin) Cmin=(mCp)min
References –process heat transfer principles and applications by ROBERT W SERTH Heat and mass transfer –cengel and ghajar
As the properties(kL, ϸL, µL) of the condensate changes with the temperature ,so some modifications are being done to compensate for that . Tf =βTw +(1- β)Tsat Where β-weight factor (recommended in the literature from 0.5 to 0.75) Condensate sub cooling The temp in the condensate film drops from Tsat at the liquid vapour interface to Tw at the wall. Therefore the avg condensate temperature, TL is less than Tsat, and hence the condensate leaving the surface is sub cooled. Accounting for sub cooling, the rate of heat transfer is Q=W ƛ +WCp,L (Tsat - TL)= Whfg*
Cp,L heat capacity of condensate W- condensation rate to account for both sub cooling and inertial effects h/hNu =(1+(0.683 -0.228 PrL-1)Ԑ)^0.25 hNu - heat transfer coeff by basic nusselt theory Ԑ- Cp,L (Tsat - Tw)/ƛ PrL - Cp,L µL/ kL above eqn is valid for Pr>0.6 Q=NhD0L∏(Tsat - Tw) Tw=…………… Then Tf can be obtained by the eqn given above Mass flow rate of water =ϸAu U –flow velocity A of tube can be calculated from the above eqn And the total area= N∏DL And the condensation rate –Q/hfg* Some FACTS to remember
In drop wise condensation Heat transfer coefficient is considerably high as compared to film condensation. The reason being the direct contact of vapor with the cooler surface. The effectiveness of a condenser can be calculated as (1 - eNTU) NTU=(UA/Cmin) Cmin=(mCp)min
References –process heat transfer principles and applications by ROBERT W SERTH Heat and mass transfer –cengel and ghajar
PROCESS DESIGN OF SHELL AND TUBE HEAT EXCHANGER, CONDENSER AND REBOILERS. Calculation of heat transfer co-efficient. Mods for the escapists. Type of heat exchanger and design pressure. Downloads lagu opick taubat. Business communication notes in hindi pdf. The optimum thermal design of a shell and tube heat exchanger involves the. Tube heat exchangers calculations it is very important to remember some. Lumion 6 crackeado. Sandhya namam lyrics in malayalam pdf software. Tower Design Free Online eBook Collection at: www.pdftop.com/ebook/tower+design. Thermal design calculations of Shell & Tube condensers for horizontal condensers, vertical condensers including reflux condensers; main features: +Support S.I.
Tube Condenser Calculations
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- History Of Refrigeration
- History Of Refrigeration ? Development Of Refrigerants And Compressors
- Applications Of Refrigeration & Air Conditioning
- Review of fundamental principles ? Thermodynamics : Part I
- Review of fundamental principles ? Thermodynamics : Part II
- Review of fundamentals: Fluid flow
- Review of fundamentals: Heat and Mass transfer
- Methods of producing Low Temperatures
- Air cycle refrigeration systems
- Vapour Compression Refrigeration Systems
- Vapour Compression Refrigeration Systems:Performance Aspects And Cycle Modifications
- Multi-Stage Vapour Compression Refrigeration Systems
- Multi-Evaporator And Cascade Systems
- Vapour Absorption Refrigeration Systems
- Vapour Absorption Refrigeration Systems Based On Water-Lithium Bromide Pair
- Vapour Absorption Refrigeration Systems Based On Ammonia-Water Pair
- Refrigeration System Components: Compressors
- Performance Of Reciprocating Compressors
- Rotary, Positive Displacement Type Compressors
- Centrifugal Compressors
- Condensers & Evaporators
- Expansion Devices
- Analysis Of Complete Vapour Compression Refrigeration Systems
- Refrigerants
- Psychrometry
- Psychrometric Processes
- Inside And Outside Design Conditions
- Psychrometry Of Air Conditioning Systems
- Evaporative, Winter And All Year Air Conditioning Systems
- Cooling And Heating Load Calculations - Estimation Of Solar Radiation
- Cooling And Heating Load Calculations -Solar Radiation Through Fenestration - Ventilation And Infilt
- Cooling And Heating Load Calculations -Heat Transfer Through Buildings - Fabric Heat Gain/Loss
- Cooling And Heating Load Calculations -Estimation Of Required Cooling/Heating Capacity
- Selection Of Air Conditioning Systems
- Transmission Of Air In Air Conditioning Ducts
- Design Of Air Conditioning Ducts
- Space Air Distribution
- Ventilation For Cooling