Answer / bharat

temperature inside heat-exchanger changes exponentially so
taking average would give erroneous results. and LMTD is
calculated by considering a small elemental area of heat
exchanger so it gives more accurate temperature difference.

Answer / awkash

Because temperature change in heat exchanger is not linear
in nature so we can not take airthmatic mean here,
physically you can think in the manner like if we inlet
temp. of a pipe is 80 and outlet temp. is 40 then u cannot
say that temp in middle will be 60.
thats why for accurte measurement we take lmtd.

Answer / abina

in heatexchanger temperature changes from point to point along the length so we are calculating Lmtd. ..Bt avg temperature dosnt gv correct value

Answer / anil

LMTD value it gives the correct average temperature without any errors compare to average temperature

colour of flame is blue as well red. why?

1 Answers   Oxford,

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CHEMICAL ENERGY BALANCE - EXAMPLE 11.4 : Calculate the bubble temperature T at P = 85-kPa for a binary liquid with x(1) = 0.4. The liquid solution is ideal. The saturation pressures are Psat(1) = exp [ 14.3 - 2945 / (T + 224) ], Psat(2) = exp [ 14.2 - 2943 / (T + 209) ] where T is in degree Celsius. Please take note that x(1) + x(2) = 1. Please take note that y(1) + y(2) = 1, y(1) = [ x(1) * Psat(1) ] / P, y(2) = [ x(2) * Psat(2) ] / P, * is multiplication. P is in kPa.

1 Answers  

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Heat transfer: In a steady state one dimensional conduction with no heat generation, the differential equation is d / dx (k dT / dx) = 0. Prove that T(x) = ax b, where k, a and b are constants. (b) At x = 0, T = c and at x = L, T = d. Prove that T(x) = (d - c) x / L c for boundary conditions.

1 Answers  

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sir i am senthil B.Tech Chemical Engineer which book is refer for objective type questions?

2 Answers   BARC, GATE,

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how to convert Nm3/hr to Kg/hr for air, @ 10.4 kg/cm2.g dischare pressure, does density doesn't affect on calculation?

1 Answers  

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Name the some common problems associated with bellow expansion joints?

0 Answers  

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i am giving BARC Trainee exam in chemical. Can anyone tell the syllabus and question paper pattern for OCES for BARC trainee?

1 Answers  

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QUANTUM BIOLOGY - EXAMPLE 33.7 : (a) In a DNA of a living cell, the quantum information available in the bases guanine (G) and thymine (T) are | G > = | 110 > and | T > = | 010 > respectively. Calculate | G > - | T >. (b) In a living biological cell, the step time for random walk of an electron is t. The localization time of an electron is T. If i is the geometric average of T and t, find log T as a function of t and i.

1 Answers  

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why do tangential entry require for a cyclone separator?

1 Answers  

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Oil and fat containing food items are flushed with nitrogen. Why?

0 Answers  

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BIOCHEMICAL ENGINEERING INSTRUMENTATION - EXAMPLE 29.5 : The following formula is used as a reference : (analyte signal) / (internal standard signal) = (f-factor) x (concentration of analyte) / (concentration of internal standard). A solution containing 3 mM of analyte and 4 mM of internal standard gave peak signals of 2 and 3 mamps respectively. Another similar solution containing 2 mM of analyte and 1 mM of internal standard gave peak signals of 1 and 4 mamps respectively. Find the average f-factor.

1 Answers  

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What's -74C, dew point is better the -70C dew point In draying unit .

1 Answers  

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