RETIREMENT HOMES
Worksheet 8.A(M)—User Group—Example Temperature at Outlet a (°C)
A B C (L/Sec = A × B L/H = A × B × C × 60 Sec/Min)
41° 43° 60° Other
Min ___________ ___________ ___________ ___________
Fixture Qty. L/Sec Use/H L/Sec L/H L/Sec L/H L/Sec L/H L/Sec L/H Bathroom group
Small hydro-tubd Based on
(less than 378.5 L) 3 0.95 Tub Size
Large hydro-tubd Based on
(more than 378.5 L) 3 0.95 Tub Size
Usage Factors (UF) (Refer to Table 8.2):
User Group Totals (UF × Totals); Transfer to Worksheet 8.B
(Continued)
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(Worksheet 8.A[M] Example continued)
Note: L/sec calculation is for a semi-instantaneous water heating system. L/h calculation is for a storage type water heating system.
aTemperatures are at faucet outlet NOT system temperature.
bBased on ANSI Standard of 0.16 L/sec for showerheads, 0.16 L/sec for sinks, 0.13 L/sec for lavatories, and 0.03 L/sec for public lavatories.
cBased on the shower as the dominant fixture.
dBased on the valve size used. Designer must base design on the type of valve that is specified or present in an existing facility.
eSame as “d” except 2 baths per hour.
fBased on 0.28 L/sec and DN15 hot water supply running full open at 1.83 m/sec maximum velocity.
gConsidered same as shower.
h0.57 L/sec based on DN20 hot water supply running full open at 1.83 m/sec maximum velocity.
iBased on Table 8.1, “General Purpose Hot Water Requirements for Various Kitchen Uses” (L/h).
jBased on the equipment used. Designer must determine which model is used.
kWhere a dash (—) appears, please refer to Table 8.1 for the recommended hourly use figure.
lAn asterisk (*) indicates the recommended outlet temperature.
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Table 8.1—General Purpose Hot Water Requirements for Various Kitchen Uses
This table, which supplies information on water usage for vari-ous kitchen uses, should be used for the dietary and food service user group.
Table 8.1 General Purpose Hot Water Requirements for Various Kitchen Uses
Equipment GPH L/H
Vegetable sink 45 170.33
Single compartment sink 30 113.55
Double compartment sink 60 227.10
Triple compartment sink 90 340.65
Prescrapper (open type) 180 681.30
Prerinse (hand operated) 45 170.33
Prerinse (closed type) 240 908.40
Recirculating prerinse 40 151.40
Bar sink 30 113.55
Lavatories (each) 5 18.93
Source: Values are extracted from Dunn et al. [1959] 1989. Chapter 4. ASPE Data Book. Table 9.
Note: Requirements are for water at 140°F (60°C).
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Table 8.2—Usage Factors for User Groups
This table provides the recommended usage factors for use with Worksheet 8.A. The following discussion gives the background of how these numbers were determined. (They represent a consen-sus of opinion of a group of experienced designers; however, designers should use their best judgment when working with these figures).
Table 8.2 Usage Factors for User Groups Nursing/Intermediate Care Facility User Groups
Dietary
Resident Nurses’ Hydro- & Food Central Misc.
Area Station therapy Service Bathing Areas
GPM (L/Sec) 0.10 0.05 0.25 0.40 0.25 0.05
GPH (L/H) 0.30 0.50 0.90 0.90 0.90 0.10
Retirement Home User Groups
Resident Rooms Laundry Misc. Areas
GPM (L/Sec) 0.10 0.50 0.05
GPH (L/H) 0.40 0.75 0.10
Note: Based on a peak usage hour with a 3-h peak period.
General
The “gpm (L/sec)” figure is based on the possibility that every hot water using fixture will be operated in any 1 min (sec). The “gph (L/h)” figure is based on the possibility that every hot water us-ing fixture will be operated durus-ing a 1-h period.
These figures are based on a peak usage hour with a 3-h peak period.
Nursing/Intermediate care facility
Resident area
Many residents in nursing care areas are not ambulatory and require staff assistance to use the toilet/bathing facilities.
Residents of intermediate care areas generally are ambula-tory and thus can use the shower facilities without assistance.
The lavatory is a fixture that is heavily used by the staff.
The 0.10 (10%) usage factor for the gpm (L/sec) is based
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on the fact that not all residents use their fixtures during the same minute. Also, fixtures in this user group flow less water per minute than fixtures elsewhere and are used for short periods of time.
The 0.30 (30%) usage factor for the gph (L/h) is based on the fact that fixtures in this user group use less water than fixtures elsewhere and are used for short periods of time.
Nurses’ station
This user group is in use 24 h a day but typically is used most heavily during shift changes. This is because of the preparation necessary before residents can be aided.
The 0.05 (5%) usage factor for the gpm (L/sec) is based on the relationship between the staff and residents. During a peak 3-h period of hot water use, the resident area is used more heavily than the nurses’ station. Since many residents need assistance using the bathing/shower facilities, staff members are in the resident area aiding residents and not at the nurses’ station using the fixtures there.
The 0.5 (50%) usage factor for the gph (L/h) is also based on these same issues, but because of the time staff members spend at the nurses’ station organizing/distributing medi-cines and doing other work, the hand washing fixtures there are used extensively.
Hydrotherapy
When in operation, this area is a large water user. The therapy staff can be split between the physical therapy and the hy-drotherapy areas.
The 0.25 (25%) usage factor for the gpm (L/sec) is based on the cyclical use of the hydrotherapy tubs and on the as-sumption that staff members are also doing physical therapy.
The 0.90 (90%) usage factor for the gph (L/h) is based on the assumption that during the peak usage time, almost all of the fixtures in this area are in use. This assumes that the staff schedules the water therapies during one time and the physical therapies during another.
Dietary and food service
This area is a large water user. Depending on the size of the facility, the usage of water for cooking and for cleaning may
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lap.
The 0.40 (40%) usage factor for the gpm (L/sec) is based on the assumption that cleaning (washing of dishes, etc.) does not occur in the same minute as food prepa-ration. Also, it assumes that the sinks are filled and then work is done using an intermittent, not a steady, water sup-ply.
The 0.90 (90%) usage factor for the gph (L/h) is based on the assumption that most of the area fixtures are used dur-ing one of the hours of the facility’s peak usage time.
Central bathing
When in operation, this area is a large water user. Staff mem-bers set a schedule for bathing nonambulatory residents, and during that time only one bathing fixture is used. The worst case scenario is when the residents are assisted by staff. This is because the staff are on a schedule and bathe the resi-dents based on that schedule.
The 0.25 (25%) usage factor for the gpm (L/sec) is based on the use of one tub at a time in each room (assuming each room has a shower, a residential tub, and a non-ambulatory residents’ bathing tub). Also taken into consideration was the time needed for the staff to get the residents and to dry them off.
The 0.90 (90%) usage factor for the gph (L/h) is based on the fact that during peak usage time almost all of the fixtures in this area are used.
Miscellaneous areas
The rest of the facility uses water, but not during the facility’s peak usage time and not as much as those areas already discussed. This is because most of the staff are not in the miscellaneous areas. These areas should be taken into ac-count, though, because water using fixtures are available and used there.
The 0.05 (5%) usage factor for the gpm (L/sec) is based on the fact that a very small number of the fixtures are used during 1 min of the facility’s peak usage time.
The 0.10 (10%) usage factor for the gph (L/h) is based on the fact that most of the fixtures in these areas are not used during the facility’s peak usage hour.
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Retirement home
Resident rooms
The residents of a retirement home are ambulatory and do not require staff assistance to use the toilet/bathing facilities. As noted earlier, this type of facility is similar to an apartment building, but its residents are of a uniform age group.
The 0.10 (10%) usage factor for the gpm (L/sec) is based on the fact that when the shower is in use, the room’s lavatory and kitchen sink are not in use during the same minute, and not all residents are using the fixtures.
The 0.40 (40%) usage factor for the gph (L/h) is based on the fact that the kitchen sink and either the shower or the lavatory are used during an hour of peak usage time.
Laundry
The laundry area of a retirement home is smaller than one for a typical apartment building. This is because the usage time for a retirement home laundry is more spread out over the course of the day since residents typically do not work.
The 0.50 (50%) usage factor for the gpm (L/sec) is based on the assumption that when one washer starts its filling cycle another is being filled with clothes, and the second machine’s cycle begins when the first washer is still filling.
Though the two washers fill at the same time, it is assumed that only half of the other washers are in use in the peak moment. Also, when a resident is using the washers, the fix-tures in his/her apartment are not in use.
The 0.75 (75%) usage factor for the gph (L/h) is based on most of the washers being used during a peak usage period.
Also, there is the possibility that a resident may leave the laundry room and go back to his/her room and use the fix-tures there.
Miscellaneous areas
Though the rest of the facility’s fixtures use water, they are not heavily used fixtures. That is because, if the facility is separate from the nursing care facility, the staff is small. If it is attached to the nursing care facility, staff members are generally in the other areas. Miscellaneous areas should be taken into account, though, because water using fixtures are available and used there.
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The 0.05 (5%) usage factor for the gpm (L/sec) is based on the assumption that only a very small number of the fix-tures are used during any 1 min of the facility’s peak usage time.
The 0.10 (10%) usage factor for the gph (L/h) is based on the assumption that most of the fixtures in these areas are not used during the facility’s peak usage hour.