If the feed is a mixture if liquid and vapor, "q" is the fraction that is liquid, i.e. q = 1-y, where y is molar fraction of vapor phase in the
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The y-intercept of the q-line for a subcooled liquid feed is negative O zero positive ; Question: The y-intercept of the q-line for a subcooled liquid feed is negative O zero positive . This problem
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Figure 2: Examples of q-line slopes The q-line (depicted in blue in Figure 1) starts at the x = y line and intersects the starting point of the rectifying section operating line. The parameter q is the mole fraction of liquid in the feed, and the slope of the q-line is q / (q - 1).
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If the feed is a vapor— liquid mixture, q is a fraction. Values of q greater than 1 indicate subcooled liquid feed. Values of q less than 0 indicate superheated vapor feed. Now let us look at the intersection points (x„ y,) of the stripping and rectifying operating lines. Use of equations (2.28) and (2.30) gives:
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At x=0.5 another small line is drawn that represents the feed or `q' line. subcooled liquid the slope of the feed line is even positive, the same for a
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Transcribed image text: Calculate the feed line (q-line) slope for the following cases. a) A two-phase feed where 80% of the feed is vaporized under column conditions VE F LE 7 v b) A superheated vapor feed where 1 mole of liquid vaporizes on the feed stage for each 9 moles of feed input b -F BC Tv c) A liquid feed subcooled by 35°F.
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For example, when a subcooled liquid with mole fraction of A=0.4 (point A) is about the condition of the feed mixture, then we can construct the q-line
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CBE3323a: Unit Operations I Course Notes - 61 - Saturated liquid (q = 1) D 45 line Liquid and vapour (0 < q < 1) Superheated vapour (q < 0) Saturated vapour (q = 0) (Z, Z) F F Subcooled liquid (q > 1) Equilibirum curve o Figure 4.13 Characteristics of the q-line It is worth some extra explanation about the feeding of subcooled liquid and
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FIG. 13-32 All five cases of q lines; (1) superheated-vapor feed, (2) saturated-vapor feed, (3) partially vaporized feed, (4) saturated-liquid
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Note that qcan be less than zero (superheated vapor) or greater than unity (subcooled liquid). The slope of the q-line is q/(q - 1). The construction of the two operating lines and the q-line is performed in Excel as follows: 1. The rectifying-section operating line is drawn using Eqs. 1 and 2 and the specifi ed values of x D and R.
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q > 1.0 subcooled liquid Position B: q = 1.0 saturatedliquidsaturated liquid Position C: 0 < q <: 1 mixture of saturated vapor and liquid PositionD:Position D: q = 0 saturated vapor Position E: q <
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Feed condition Value of q Subcooled liquid >1 • q: ratio of the increase in molar reflux rate across the feed > 1 Bubble-point liquid 1 Partially vaporized L F /F reflux rate across the feed stage to the molar feed rate L L V V Dew-point vapor 0 Superheated vapor < 0 F q F V V q 1
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SG5065 CIRCUIT BREAKER GV2ME10 q-line for subcooled liquid GV2ME10 | Schneider Electric 4 → 6.3 A TeSys Motor. Schneider Electric Motor Protection Circuit Breaker - GV2ME10. Significantly reduces downtime of machinery which allows operations to operate smoothly and safe. Forms part of the TeSys range of products, known as the TeSys GV2 (Green
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Subcooling. The term subcooling (also called undercooling) refers to a liquid existing at a temperature below its normal boiling point. For example, water boils at 373 K; at room temperature (293 K) the water is termed "subcooled". A subcooled liquid is the convenient state in which, say, refrigerants may undergo the remaining stages of a
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How many degrees is the liquid subcooled in the condenser? Therefore, the liquid must be subcooled to at least 97 degrees to prevent liquid line flash gas. This means the system would need at least 8 degrees (105 degrees - 97 degrees) of condenser subcooling to prevent liquid line flashing before getting the metering device.
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subcooled liquid Position B: q = 1.0 saturatedliquidsaturated liquid Position C: 0 < q <: 1 mixture of saturated vapor and liquid PositionD:Position D: q = 0 saturated vapor Position E: operating line after crossing the q-line, estimating the last stage if necessary.
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The MLHP with two evaporators and two condensers was tested in 2002 , finding that the MLHP's operating behavior remained proper at different temperatures of condenser cooling until the uncondensed vapor flowing from the condenser with higher temperature penetrated to the confluence of liquid line, converging with the subcooled liquid flowed
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If feed is a subcooled liquid, q>1 (i.e., L' augmented by vapor condensation), "slope" of feed equation is positive. If feed is a superheated vapor, q<0 (i.e., L' decreased evaporation), "slope" of feed equation is positive.
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Plotting the q-line. (21.3) \begin{displaymath} F=L_F+V_F \end{displaymath}. (21.4) \begin{equation*} q=\frac{(\overline L -. For sub-cooled liquid, q > 1.
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So, can we have a condition in which we have subcooled liquid from the receiver flowing into the liquid line? Subcooled liquid and receivers. This question is generally answered as follows: No, except for the minor amount of subcooling generated by static pressure due to the liquid level in the receiver. For example, R-404A liquid will generate
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subcooled liquid feed on the distillation column performance. All q-lines are parallel and meet the y = x line at the corresponding value of xF,
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