Document 82rxppZypm5B6QJRgp41Z6Rnm

Heating Ventilating Air Conditioning Guide 1938 20-Baths at 40 gal and 33 per cent................................................................................... ................ . 270 gal 20 Lavs, at 20 gal and 25 per cent ................. ................................. ............................................ 100 gal 20 Sinks at 30 gal and 33 per cent------------------------------------ :----------------------------------------------- 200 gal 20 Trays at 50 gal and 60 per cent_ 600 gal Total.----- -- --------------------- .--------- ----------------------------------- .--............................... ............ ............. 1170 gal Probable peak use at one time................... ................................................. ................ ................. ...... 35 per cent Probable actual peak demand.................................................................. ........................ .................. 409 gph If three persons Eire assumed to an apartment the total daily use of hot water should approximate 20 X 3 X 40 gal = 2400 gal and if the peak hour is 10 per cent of this amount, the peak hour by this method shows a probable demand of one-tenth of 2400 gal, which indicates that the values in Table 13 are safe. SWIMMING POOL HEATING REQUIREMENTS Swimming pools present a problem of hot water heating demand which is frequently overestimated. Few outdoor swimming pools require water heating, and in some cases they require the addition of cold water to regulate the. temperature. The recirculation system, of a swimming pool consists of the pumps, hair and lint catchers, and filters together with all necessary pipe connections to the inlets and outlets of the pool. The water heater, the sterilizing equipment and suction cleaner are usually installed or connected to the recirculation system and may be considered as integral parts of the system. The recirculation system and all its component parts should be designed to provide the required volume of circulation so that the water turnover ratio is at least two times per day and where heavy loads are anticipated the turnover ratio should be increased to three times or more. Many states have regulations prescribing the circulation turnover. The water heaters for swimming pools are usually instantaneous steam Table 13. Ordinary Maximum Hourly Demand for' Hot Water for Various Fixtures in Gallons and Probable Percentage of Usage Ttpb o? Building Maximum Phobablb Usage GPH Lavatories Private Public Baths Showers Sinus Sines Sines Baths Teats Av. Max. Use* 20 20 40 300 30 30 20 20 50 \ Probable Usage in .Per Cent of Maximum Ordinary Use Apt. house Club Gym. Hospital Hotel Industrial Laundries Office building Baths Residences Schools Y. M. C. A. 25 50 33 67 67 , 33 50 25 60 35 25 75 50 67 67 67 100 25 80 60 25 100 100 100 100 ,, 80 25 75 50 33 67 67 100 25 80 45 25 100 50 33 100 67 100 25 80 70 25 150 100 100 67 67 100 90 25 100 25 75 33 50 __ 100 100 20 25 150 150 100 50 100 25 50 33 50 33 50 50 60 50 25 75 100 67 33 100 50 25 25 100 100 100 67 67 100 100 80 75 Percentage of fixtures likely to be demanding maximum probable usage at any one time. 804 Chapter 43. Water Supply Piping and Water Heating coil heaters. These heaters should be sized so that they will have suf ficient capacity to heat the water delivered by the circulating pump 15 F per hour. The water temperature in a pool is usually maintained at about 72 F. A few states have regulations prohibiting higher water temperatures than 70 F. The room temperature should be approximately 5 F higher, but not more than 8 F higher nor less than 2 F lower, than the water tem perature. Example 6. Assume a swimming pool 75 ft long, 30 ft wide with an average depth of 6 ft. If the water is to be heated from a temperature of 50 to 65 F, what capacity heater and steam consumption is required with a turnover ratio of two times per day? Pool volume: 75 X 30 X 6 X 7.5 = 100,000 gal. With a turnover ratio of twice in 24 hr, the heating capacity is: X 2 _ gggg gal per hour. 1 he steam consumption would be:---------------- --------------------- = 1080 lb steam per hour. Regulation of swimming pool temperatures is essential for successful operation and economy. It is therefore recommended that the steam supply to the heater be provided with a by-pass which may be used for pool filling and initial heating and that a smaller by-pass be installed with an automatic control valve having the capacity to heat the cir culation water approximately 5 F per hour. Table 14. Hot Water Consumption in Various Types of Buildings for Different Purposes Type or Building Conditions Gallons Hotels Buildings Industrial Buildings Restaurants Room with basin only Room with bath (Transient) (Men) (Mixed) (Women) Two-room suite and bath Three-room suite and bath 10 (per day) 40 (per day) 40 (per day) 60 (per day) 80 (per day) 80 (per day) 100 (per day) Public bath or lavatory 150 (per day per fixture) Public shower 200 (per day per fixture) Public lavatory with attendant 200 (per day per fixture) Per office employee Per factory employee Cleaning floors 2 (per day) 5 (per day) 3 (per 1000 sq ft per day) $0.50 Meals $1.00 Meals $1.50 Meals 0.5 (per customer with hand washing) 1.0 (per customer with machine washing) 1.0 (per customer with hand washing) 2.0 (per customer with machine washing) 1.5 (per customer with hand washing) 4.0 (per customer with machine washing) 805