Screening MRD Analysis #1

Description

Execute a screening analysis for the multi-room dwelling exposure simulation model

Usage

mrd.screen1(HOUSE = 1:4, RA = 1:3, SCENARIO = 1:6,
            DEP.DES=1:3, FORCE=1:2, labels=TRUE, ...)

Arguments

Details

The function will execute the mrd exposure model for a limited set of inputs, according to a factorial design determined by the combination the specified factor levels.

A set of factor levels are specified as arguments with the total number of cases to be simulated determined from the number of unique combinations. The meaning of the integer factor levels are as follows:

HOUSE

Types of housing

1. 1 main room, 1 story, 1 kit/din/liv/bed/aux, 1 bath
2. 3 main rooms, 1 story, 1 kitchen/dining, 1 living/aux area, 1 bedroom, 1 hall, 1 bath
3. 4 main rooms, 1 story, 1 kitchen/dining area, 1 living room, 1 bedroom, 1 auxiliary, 1 hall, 1 bath
4. 6 main rooms, 2 stories, 1 kitchen, 1 dining, 1 living room, 1 bedroom, 2 auxiliary, 2 halls, 2 baths

RA

Receptor Time-Activity Patterm

1. Spends entire day at home, following the smoker exactly ("follower")
2. Spends entire day at home, only time in kitchen/dining with smoker, napping in the middle of the day in the bedroom ("napper")
3. Spends entire day at home, avoiding the smoker ("avoider")

SCENARIO

Mitigation Strategy, note that smoking is allowed everywhere except in bathrooms and laundry rooms. Air exchange is always 0.5 per hour.

1. doors open & windows closed
2. doors closed (when smoking) & windows closed
3. doors closed & windows open (when smoking)
4. doors open & windows closed & ventilation on 10%. Episode duration is 10 min.
5. doors open & windows closed & ventilation on 100%. Episode duration is 10 min.
6. doors open & windows open (for both smoker/nonsmoker)

DEP.DES

Deposition/Desorption/Sorption

1. Deposition loss rate set to 0.1 per hour, varying deposition velocity per room. Desorption is zero. Corresponding to airborne particles.
2. Deposition velocity is 1.4 m/h and Desorption coefficient is 0.00042/h, corresponding to nicotine on painted wallboard. Initial nicotine mass on walls is zero. Emissions are 5 mg of nicotine per cigarette.
3. Same as 2. but initial nicotine concentration on walls is 50 mg/m2.

FORCE

Driving Force for Flow

1. Temperature-driven. Open doors are 100 m^3/hr, when doors close the interior flow is reduced to 1 m^3/hr. Windows are 150 m3/hr in both directions.
2. Wind-driven. See sim.flows.

If all possible levels are specified as input, which is the default, then there are a total of 432 distinct cases.

The following inputs are fixed for each simulation:

SA

The smoker is home most of the day, smoking in every room they visit. 30 total cigarettes are smoked by the smoker (not necessarily in the house).

SPOUSE

We assume the two occupants are spouses, and sleep in the same BED room, if the RA and SA time-activities demand it.

VOL

Corresponding to each house above: We specify them precisely, based on most likely house volumes from the 2001 American Housing Survey

1. main room: 200 m3, bath: 7 m3
2. main rooms: 100 m3, 100 m3, 50 m3, hall: 30 m3, bath: 7 m3
3. main rooms: 100 m3, 50 m3, 50 m3, 50 m3, hall: 30 m3, bath: 7 m3
4. main rooms: 60 m3, 60 m3, 80 m3, 70 m3, 50 m3, 50 m3, halls: 30 m3, baths: 7 m3

CIGS

1.5 packs (30 cigs) smoked throughout the day. 10000 ug/cig. 10-min dur.

MECH.PERC

When on the HVAC operates at a duty-cycle of 10% or 100% when at least one occupant is awake, with "on"-times of 10 minutes. Flow rate is 5 house volumes per hour divided evenly between a hall vent and make-up outdoor air for return and the supply evenly divided between all rooms.

AER

Air exchange rate is 0.5 per hour, corresponding to ventilation rate off

FLOW

Open doors are 150 m3/hr, when doors close the interior flow is set to 1 m3/hr. When windows are opened the flow is set to 150 m3/hr.

DEP

Deposition loss rate set to 0.1 per hour for particles, deposition velocity set to 1.4 m/h for nicotine.

DES

Desorption rate set to 0.00042 per hour for nicotine

Value

A dataframe with components:

Author(s)

Neil Klepeis