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
Condenser Design Calculation Pdf Reader Free
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
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Condenser Design Calculation Pdf Reader Software
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