Book - School of Science and Technology

586 Hot water supply systemsTable 20.4 Daily hot water demands (adapted from Institute of Plumbing Guide)Type of buildingDaily demand(litre/person)Storage per24 hour demand (litre)Recoveryperiod (h)Colleges and schoolsboarding115 23 2.0day 15 4.5 2.0Dwelling houseseconomic local authorityhousingstock 115 115 4.0medium private property 115 45 2.0luxury private property 136 45 2.0Flatseconomic local authorityhousingstock 68 23 4.0medium private property 115 32 2.0luxury private property 136 32 2.0Factories 15 4.5 2.0Hospitals ageneral 136 27 1.0infectious 225 45 1.0infirmaries 68 23 1.5infirmaries with laundry 90 27 1.0maternity 225 32 2.0mental 90 23 2.0nursingstaff accommodation 136 45 2.0Hostels 115 32 2.0Hotels5 star rating136 45 1.02 star rating114 36 1.5Offices 14 4.5 2.0Sports pavilions 40 40 1.0Restaurants per meal 6 2.0Notea For hospital design refer to HTM2027Table 20.5 Hot water storage at 65 C and boiler power per person and per mealBuildingand useValidityof data(persons ormeals/day)Required storage capacity (litre per person or litre per meal)when the recovery period is as follows (hours)1 ¤ 2 1 2 3 4Hostelservice 80±320 3.0 5.0 7.2 9.7 12.2Hotelservice 80±320 7.5 11.0 15.0 16.8 18.5catering140±840 2.4 3.4 4.7 5.5 5.9Officeservice 110±660 0.7 0.9 1.2 1.6 2.0catering40±370 2.0 3.5 5.0 6.1 7.1Restaurantservice 100±1010 0.3 0.4 0.5 0.6 0.7catering100±1010 0.4 0.6 0.9 1.1 1.3Continued on facing page