Document mpQROdDOqq0ewGpvnrveGDLrJ

American Society of Heating and Ventilating Engineers Guide Table 7. Hot Water Requirements for Apartment Buildings Class lavatories Ho^BW--- Fix-tore, peh Apartment Bath Tube Showers Over Tubs Kitchen Sinks Class Gallows , Add tor Kitchens Per Meal Capacjtt I Add Hot Water perH. W. Fixture per Day PerH. W. Fixture per Maximum Hour Per Day "------ " --------- Per MaHxoimurum Per Piece 1 Per Day High-class transient....----- ( Medium-class transient... Apartment hotels---------- 85 70 50 6.8 6.5 5.0 3.0 2.5 2.0 1.0 0.80 0.60 1.0 1.0 1.0 Having hot water in public toilets only......... ................ Having hot water in private offices as well as in public toilets.......................-- ....................................... .... For self-closing hot-water fixtures deduct.____________ PerMaximmaHoa \ - Table 10. Hot Water Requirements for Hospitals Hot Water Hot Watsj Gallons used per average day.......................................................... Per Patient Per Fixtcw Gallons used per maximum day..... .......................... .... :.................. Average maximum rate of flow for 15 min. in gallons per hour__ Maximum rate of flow for 15 min. in gallons per hour..................... j 82 127 11 j 48 675 19 8 Sole.--The'values in.this table are based on Utility Demands of a Modern Hospitals by Larson. Neho and Rose (A.S.H.V.E. Transactions, Vol. 34, 1928).' . ...... Note.--The hot water used is 25 per cent of totai water, requirements. The above requirements are io a hospital without a laundry. 300 Chapter 19--Water Supply Systems aMion, when the other fixtures within the building are in use to their wilted average capacity? m'The answer, according to Table 5, is found to be 75.8 lb. at the inter'section of 100 ft- vertical height and 75 ft. horizontal run. only 10 lb. be required at the uppermost fixture, then 70 8 lb ild be the answer. Sgotire Tank on Roof ^2lf the tank is elevated above the highest fixture, similar computations `i frili: apply fr branch connections and main risers except that the main .lifisef will have its greatest diameter at the top. It will be seen that an ^elevation of 3d ft. or more will give the necessary 15 lb. pressure at the shighest .. f.ixJtut-r--e-------atonna ftivhla-utrethsedopwrens,snurre40drIohp. nmeray100b.e made e^qual to the Table 11. Water Requirements for Hospitals ac Total Water Total Water Used Ex clusive or Amount Used in .Toilets, Slop Sinks, Softener Flush ing and Refrigeration Cooling Cold Water Used Ex clusive or Amount Used In Toilets, Slop Sinks, Softener Flush ing and Refrigeration Cooling Per Patieutb Per Fixture Per Patient Per Fixture Per Patient Gallons used per average day........... Gallons used per maximum day....-- Average maximum rate of flow for 15 min. in gallons per hour.TM.TM.Maximum rate of flow for 15 min. in gallons per hour.......... ............. 366 527 29 50 77 275 104 193 116 423 174 296 7 25 8 14 12 44 16 30 afhe values given are based on Utility Demands of a Modern Hospital, by Larson, Nelson and Rose {(A.S.H.V.E. Transactions, Vol. 34,1928). bThe items in this column, include water used for flushing softeners and refrigeration condenser. eLaundry not included. Pipe Sizes for Hot Water Supply Tables 7, 8, 9 and 10 give the hot-water requirements for several kinds of buildings in terms of gallons per maximum hour and per day. Table 11-gives the total water requirements for hospitals. `-."Pipe sizes for hot-water systems may be calculated from the foregoing data on cold-water systems, using the same quantities for the gallons of hot water required per minute as is given for the cold water. It should be borne in mind that a column of hot water is lighter than one of cold water, amounting to about 2^ ft. per 100 ft. in the height of columns of .equal weight. In case the cold water must first be fed down from roof tanks to heaters in the basement and then back up to the top-floor ;fixtures, the extra length of run must be taken into consideration. As'a check on the total quantity of hot and cold water required per day, this ;i.s generally from two to three times the amount of hot water required .and from 80 to 100 gal. per occupant of the building. . The return main for circulating systems may be the size of the most .distant hot water flow main. It is obvious that no advantage, will be gained by making the return any larger than this, but it is pqually obvious