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Routledge French Technical Dictionary Dictionnaire

by:DIGUANG     2020-11-09

Experiments to measure the condensation heat switch coefficient and the pressure drop in brazed plate heat exchangers had been carried out with the refrigerants R410A and R22. Brazed plate warmth exchangers with completely different chevron angles of 45°, 35°, and 20° have been used. Varying the mass flux, the condensation temperature, and the vapor high quality of the refrigerant, we measured the condensation warmth transfer coefficient and the pressure drops.


The pressure drop increases with rising mass flux and high quality and with decreasing evaporating temperature and chevron angle. It is discovered that the heat switch coefficients of R410A are bigger than those of R22 and the stress drops of R410A are less than these of R22. The empirical correlations of Nusselt number and friction factor are instructed for the examined PHEs. The deviations between correlations and experimental data are within ±25% for Nusselt quantity and ±15% for friction issue.


Both the warmth transfer coefficient and the pressure drop elevated proportionally with the mass flux and the vapor high quality and inversely with the condensation temperature and the chevron angle. A plate condenser is a condenser developed for condensing steam based on an evaporation or distillation system under vacuum situations.


Tubes embedded within the porous plate carry a cooling medium for transferring heat therefrom to condense the vapor. Experiments on the evaporative warmth switch and pressure drop within the brazed plate warmth exchangers had been carried out with refrigerants R410A and R22. The plate warmth exchangers with different 45°, 35°, and 20° chevron angles are used. The heat transfer coefficient will increase with increasing vapor high quality and decreasing evaporating temperature at a given mass flux in all plate warmth exchangers.


The plate heat exchanger may be in-built sections, separated with simple divider plates or more difficult divider frames with extra connections. This makes it attainable to heat, regenerate, and cool a fluid in one heat exchanger or warmth or cool multiple fluids with the same cooling or heating source. Compact Size The excessive efficiency requires less warmth transfer space resulting in a much smaller warmth exchanger than would be essential for the similar effectiveness of other warmth exchanger sorts.


Typically a plate warmth exchanger requires 20-40% less area than required by a shell & tube heat exchanger. We bear in mind gas pace, condensate film and move control, as well as geometrical issues like hole width, top and length of plates to provide the most efficient and effective heat transfer out there. For partial condensation, a two-stage mode of operation with different cooling brokers is out there to avoid wasting on costs. In this chapter it was offered the event of two models for the design and optimization of plate heat exchangers.


Estimated by extrapolation, an up-scaled bubble desalination system with a 1 m2 condenser could produce around 19 l of distilled water per day. Sodium chloride salt removing was discovered to be highly effective with condensate salt concentrations between 70 and one hundred thirty five µS. Means are supplied to assure that the surface adjacent the condensate is -wet at substantially all occasions.


Experiments to measure the condensation warmth switch coe�cient and the strain drop in brazed plate heat exchangers have been performed with the refrigerants R410A and R22. Brazed plate warmth exchangers with di�erent chevron angles of forty five�, 35�, and 20� had been used. Varying the mass ux, the condensation temperature, and the vapor high quality of the refrigerant, we measured the condensation warmth transfer coe�cients and the pressure drops. Both the heat switch coe�cient and the stress drop increased proportionally with the mass ux and the vapor high quality and inversely with the condensation temperature and the chevron angle. Correlations of the Nusselt quantity and the friction factor with the geometric parameters are advised for the examined BPHEs.


The plate condenser based mostly on the semi-welding method consists of particular plate pack and gaskets. The cooling medium is warmed up in a channel with a gasket, and the steam is condensed in the weld channel. The plate condenser is primarily used along side a plate evaporator as a condensation of steam in an evaporation or distillation system. The plate condenser is utilized in more and more condensation occasions as a result of its high heat exchange impact, low enter price and convenient maintenance operation. Therefore, such design makes it with greater heat exchange effectivity and lower fouling coefficient.

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