COMCHETE DAGE rising and condensing when flooding the rink. (3) The riding academy required to be warmed in order to enable the sawdust and tanbark floor to be damped, for the purpose of keeping down dust, without freezing, at times when the rink was not being used; the rink being heated whilst the riding academy is not in use. (4) It was desired to supplement the heat already in the club building by heating additional rooms, not already heated. (5) It was desired to provide means for cooling the air in the building during the Summer. HOT BLAST SYSTEM SELECTED. After considering various alternative schemes, it was decided to warm the building by circulation of air drawn. through steam coils by electrically-driven fans. For this purpose a 150-H.P. re PLAN AND ELEVATIONS OF FAN ROOM. turn tube portable boiler, supplied by the Stuart Machinery Co., Winnipeg, was installed in the basement of the club house, and was connected to Vento cast-iron coils, 60-in. high, arranged in two stacks. of eight groups of 13 sections each, having a total heating surface of 3,328 sq. ft. The coils are enclosed in a steel casing, open at the two ends for the admission of the returning air from the building, and connected in the centre to the inlets of the fans, which stand below. The coils are placed with their lower ends at a height of 4 ft. above the level of the water line of the boiler, so that the condensation will return to the boiler by gravity, without the use of pumps. The main steam pipe supplying the coils is 7 in., with 21⁄2-in. branches, separately valved to each of the 16 sections. A 12-in. pipe, connected to the blow-off pipe, returns the condensation to the boiler, and the blow-off pipe is also connected to a blow-off tank, with an overflow outlet to the sewer, for the purpose of draining the system, valves being provided on the different connections. On the return from each group of coils are placed two automatic air valves and also a petcock, to insure the thorough venting and draining of the coils when steam is shut off. In addition to the 7-in. pipe to the Vento coils, the boiler is connected by a 4-in. steam pipe to the original heating system in the clubhouse, each pipe being valved, so that the whole of the heating may be done by the new boiler, or the two original boilers may be used as auxiliaries, if desired. An 8-in. pipe from the boiler supplies steam to these two pipes. The boiler is lagged with magnesia blocks and 1⁄2 in. of asbestos cement, the whole being covered with canvas. The steam pipes are covered with air cell asbestos pipe covering, and the breeching is covered similarly to the boiler, but with 1 in. air space between the breeching and covering. The smoke stack is of brick, 32 in. square inside, to a height of 50 ft. above the grates, lined with firebrick, and surmounted by a steel stack 36 in. diameter by 52 ft. high, giving a total height of 102 ft. above the grates. The combustion is such that when burning bituminous slack coal and Funning the plant to its full capacity, there is little or no smoke to be seen coming from the stack. The air is circulated by means of two Sturtevant 7-housed Multivane fans, the larger one having a wheel 521⁄2 in. diameter, designed to run at a speed of 289 R.P.M., and the smaller one having a wheel 461⁄2 in. diameter, designed to run at a speed of 317 R.P.M., belt-driv en, respectively, by 20-H.P. and 15-H.P. variable speed Canadian General Electric Co.'s A. C. electric motors. The object of the variable speed motors is to enable the discharge of air to be varied to suit varying conditions of weather. ARRANGEMENT OF AIR DUCTS. This arrangement is sufficient to provide, when the fans are running at their full speeds, four changes of air per hour in the main building. The fans, coils, and motors are placed in an extension of the basement underneath the seats at the southeast corner of the main building. The warm air is distributed through the main building by means of galvanized-iron ducts concealed under the tiers of seats. The duct from the larger fan is 48 in. square near the fan, and extends along the east side and the in., and 50 along the north end, 160 sq. in. each. The air is discharged from these outlets at a temperature of about 100° F., with a velocity of about 300 ft. per min., and the ducts are so designed that there is practically the same rate of discharge from each of the outlets throughout the building. AIR SUPPLY FOR RIDING ACADEMY. For the purpose of warming the riding academy, the duct from the larger fan is fitted with a 48-in. square branch running up to a height of about 20 ft. above the ground, and branching into two 41-in. diameter outlets set at 45°, discharging horizontally above the heads of the horses. A damper is provided so that the air may be discharged either into the main building, or into the riding academy, as desired. The height of the discharge in the riding academy is neces north end, being gradually tapered down to 25 in. diameter at the end near the northwest corner of the building. The duct from the smaller fan is 41 in. square near the fan, and extending along the south end and west side of the building, reduces down to 14 in. at the end, which is close to, but not connected with, the end of the larger duct. From these ducts, small branches are taken, terminating in outlets under the seats. The 96 outlets along the two sides and the south end have an area of 180 sq. DETAILS OF BOX FOR AIR DUCTS. sary to prevent an unpleasant flow of air to horses and riders. A separate duct is also provided from the larger fan, 24 in. in diameter, for the purpose of warming some of the rooms in the basement of the club house, which are not steam heated, and for supplying warm air to the ticket office at the main entrance on the ground floor to prevent draft of cold air, when the outside doors are open to admit the public. UNUSUAL CONDITIONS ATTENDING OPERATION OF PLANT. As an indication of the requirements in the heating of this building, it may be noted that during cold weather the temperature inside the building has been recorded as low as -21° F. With the present heating system it is possible to maintain, in the coldest weather, a temperature as far above freezing as is permissible without damaging the ice. |