Performance of evaporative condenser changes with the outside weather condition and mainly it depends upon WBT of outside air. There is rise in condenser capacity take place with reduction in WBT temperature. So it possible to optimize the condenser capacity by reducing condenser pressure and by varying air flow rate and water flow rate. The purpose of this guide is to provide the necessary background information on the Condenser Water Pump calculator to be able to use the calculator and to fill out a condenser water pump schedule. This guide covers the overall condenser water system, the calculator and the condenser. Kodiak manual. The Spray Condenser. The coolant is sprayed, using nozzles, into a vessel to which the vapor is supplied. Cricket captain 2006 torrent. This is shown schematically in Figure 1.It is important that the spray nozzles and vessel are designed to produce a fine spray of liquid (to give a large interfacial area for heat transfer), and a long enough residence time of liquid droplets in the vessel. Condenser Heat Exchanger is very common in process industry, condensers may be classified in two main types; Condensers which have a coolant and a condensing vapor brought into direct contact and other types which have the coolant and a condensate stream separated by a tube wall or a solid surface.
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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PROCESS DESIGN OF SHELL AND TUBE HEAT EXCHANGER, CONDENSER AND REBOILERS. Calculation of heat transfer co-efficient. Type of heat exchanger and design pressure. Downloads lagu opick taubat. The optimum thermal design of a shell and tube heat exchanger involves the. Roadblock 1 5 9 – content blocker safari. Tube heat exchangers calculations it is very important to remember some. 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. Ekaterina velika diskografija download.