8. You are the city engineer sitting in a discussion about a program to give ker

Question

8. You are the city engineer sitting in a discussion about a program to give kerosene heaters to needy people. Recent inspections of target homes show that the air exchange rates (Q/V) at present to be an average 4 per hour. Before the heaters are given away, the city, with the help of a team of volunteers will fix windows, caulk and add insulation so that any home receiving the heater will be at most 1.5 air exchanges per hour. The manufacturer specs show that the heaters will produce 23 mg of carbon monoxide per second. If the average home will use one heater in the living room (500 m) and one in each of the three bedrooms (each 400 m'), do you foresee any problems with this plan? Would you want to live and sleep in a home with these CO concentrations (e.g. based health standards)? Support your recommendation in a memo to the mayor and city on council. (20 points)

Explanation / Answer

concentration model for heat exchange  

is Ci = Pa Co /(a+k) + S/(a+K)V

P = penetration Coefficeint

k is decay rate

S is mass flux

V is Volume

S = 23 mg/sec

here Ci = Co + S/av

here as all the windows aew closed Co =0

so Ci = S/aV = 23*10^-3* 3600sec/(1.5*1700)

Ci = 0.0325 ppm = conc of CO

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