q-line for subcooled liquid

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Jan 08,  · Y = (q/(q-1))X - (Xf/(q-1)) Pick an arbitary value for X just a little to either side of Xf. You now have two points to draw the q line. You will need to get your hands on a boiling point

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.

Draw the q-line for the following conditions: a) Feed is 30 mole % methanol and is a saturated liquid. b) Feed is 30 mole % methanol and is a two phase mixture that is 30% vapor . Subcooled liquid, q= (Ḹ - L)/F = ((F+F/5 +L)-L)

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 

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, 

May 22,  · If the temperature of the liquid is lower than the saturation temperature for the existing pressure, it is called either a subcooled liquid or a compressed liquid. The term

Step 6: Draw the line with slope 0.5 which is the rectifying section OL. Step 7. Draw the stripping section operating line from the Bottoms composition to the intersection of the rectifying section OL and the q-line. y drawing a x Solution: Step 1: From x D locate x 1 and y 1 horizontal line to the equilibrium condition for stage 1. Step 2

Where q is the mole fraction of liquid in the feed. For a sub-cooled liquid the slope of the line is between 45° and vertical.

Subcooled flow boiling has various applications in industrial processes, which includes the regasification of liquefied natural gas at the gas terminal. As subcooled liquid enters the inlet, it is heated up by a constant heat flux applied to the wall surface. The model consists of an inlet region, a heating region, and an outlet region

For sub-cooled liquid, q > 1 and the slope of the feed line is positive but less than infinity. For super-heated vapor, q < 0 and the slope of the feed line is 

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 has been solved! See the answer See the answer See the answer done loading. Show transcribed image text

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

These limits are derived when the feed is either a superheated vapor or a subcooled liquid (when the enriching section operating line coincides \\·ith the diagonal line on the x -y diagram). 3. Some conceptual errors will appear in the deri,·at.ion of q-line.

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,

Subtract the actual liquid line temperature from the condensing temperature. The answer is the degrees of subcooling the system has. Systems that have no receiver, or any special devices to increase subcooling, should have about 10°F subcooled liquid refrigerant. Systems that use regular receivers will have little or no subcooling.

a) Subcooled liquid Vapor to vapor, liquid to liquid. (d) Dew point vapor However, if the feed condition is fixed, q-line is also fixed and then we.

Slope of the q-line is: Answer (a) V/F denotes the vapor fraction, hence the liquid fraction is=(1-0.37)=0.63 Slope of q-line: Feed is 50% ethanol and is a subcooled liquid. One mole of vapor must be condensed to heat 12 moles of feed to their boiling point. f. Feed is 20% ethanol, and 70% is vaporized in a flash distillation system.

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.

Oct 03,  · Adding the material balance (Q-line) to the y-x diagram

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

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.

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

The q-values. If the condition of the feed is known to be either saturated liquid or saturated vapour, then the value of q is either 1 or 0.

Equation 7 is the equation of the operating line for the stripping section. The feed type is characterized by using a factor q, defined as the number of moles of liquid flow in the stripping

used for the distillation of subcooled liquid ( or superheated vapor) feed. There is also the q-1. (10). This is known as the equation of the feed line.

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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Liquid can lose heat and subcool in the receiver, filter drier, and liquid line before it gets to the metering device. However, if there is any refrigerant vapor in the receiver, the subcooled liquid will not subcool further. The vapor will recondense to a liquid in the receiver. Both the liquid and the vapor will reach a new saturation

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.