Please help me solve. Show good details Anna Lytical purchased a mobile home las

Question

Please help me solve. Show good details

Anna Lytical purchased a mobile home last year. She has been suffering severe allergic symptoms and has detected a strong odor of formaldehyde. An analysis of the mobile home air has revealed that the formaldehyde concentration is 0.28 ppm. Anna's friend, Sybil Injuneer, has measured the air flow in the ventilation system and found that the ventilation rate is 0.56 air changes per hour (ach). She has recommended increasing the ventilation rate to reduce the formaldehyde concentration below the threshold odor level of 0.05 ppm (Lee et al., 2001). Assuming the mobile home volume is 148 m^3 and that the outdoor air concentration is 0.0 ppm, estimate the ach required to achieve the threshold odor level. Answer: 4.97 ach

Explanation / Answer

Assume that the rate of formaldehyde “production” (P),i.e, rate of desorption fromcarpeting, etc., is constant.

A material balance may be written for the mobile homevolume as:

Input+Production=Output

0+P=Q y

where, y = the mole fraction of formaldehyde in the inside air.

For Q1 = 0.56 ach, y1=0.28, and y2= 0.05,

Q2 = (Q1y1) / y2 = (0.56 * 0.28 ) / 0.05 = 3.136 ach

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