starting at the business section, traverse the residential quarters and end in
two large parks bordering the sea. These would make a handsome setting
for the two cathedrals, indicated on the plan.
Thick masses of verdure, in the form of a long band of parks, gardens
and play-grounds, bordering the second canal, separate the one zone from
the other. Directly connected, however, with the Railway Station, the navi-
gable canal and business quarters, are the freight depots, gas and power-
and 5, which will be provided with static transformers. But these sub-stations will also receive
steam at high pressure from another quarter : from the special boiler houses B C D E for the
sub-stations i, 2, 3, 4, and from the principal boiler house A for the sub-station 5.
The steam produced in the boiler-houses at the pressure of 10 kilos, will have a drop of pi cs
sure of 2 kilos on full load. The steam received at 8 kilos will be expanded in the turbo alter-
nators to a maximum pressure of 1 kilo, pressure under which it will then be distributed in each
district for heating purposes. During the winter, the turbo alternators in each sub-station will
supply the quantity of electric current which, by its previous expansion, the quantity of steam used
for heating may have produced. The static transformers will supply the surplus. For the full
amount of heating, each of these stations 1 2 3 and 4, will thus use about 240000 kgs of steam
an hour, while producing 7000 k. w. Sub-station 5 will use 120000 kgs of steam while producing
3 5oo k. w. Each of these stations will be provided with turbo alternators thus distributed :
Stations 1234: 3 turbo alt. 2000 k. w.
1 turbo alt. 1000 k. w.
Station 5 : 3 turbo alt. of 1000 k. w.
i turbo alt. of 500 k. w.
In these conditions, a good efficiency can be obtained whatever the load. The space necessary
for the sub-stations will be : 800 m2 for No 1 2 3 and 4, and 5oo m2 for No 5.
The annex boiler-houses will each produce i3oooo kgs of steam an hour, and will contain
boilers with a total heating surface of 6700 m2, occupying a space of iooo ui2. The total surface
of each of these boiler-houses is approximately 2 000 m2. Each of these groups of boilers will also
provide the steam necessary for special services such as laundries, steam cooking, disinfecting
in the hospitals and other neighbouring buildings. The circulation of hot water, heated by a part of
the economisers and by the exhaust steam from the auxilliary machines in the boiler-house, will
provide heat for these same buildings.
The annex boiler-houses will be provided with the same improvements in the system of draft
and for separating the substances of the gases as the main boiler-house. They will burn the coke
furnished by the city gashouse, and if this is insufficient, hard coal will be added. If this supply
is small or difficult to obtain, special measures will be taken to provide smoke consuming hearths.
DISTRIBUTION of EXHAUST STEAM THROUGHOUT THE CITY
t V '*
The steam is distributed by means of pipes under the sidewalks. A pressure regulator will
be placed at the entrance of each building. Steam will be sold by the weight, the measure of the
condensed water being taken by means of a meter. The distributing pipes will be so joined that
at any point they can be fed from both sides. Under these conditions an injury to the pipes can
only paralyse the service for a very short time and within a very limited area.
THE PRODUCING CAPACITY OF THE INSTALLATION
The loss of heat in the transportation of steam at high pressure is :
From B to 1 and from D to 3, 5 °/0-
From C to 2 and from E to 4, 8 °/o-
From A to 5, 2, 3 Ve-
in the transportation of exhaust steam, the condensation in the pipes may reach 1 5 to 20 °/»
of the consumption of heat.
Ingdnieur des Arts et Manufactures.
Membre de la Society des Ingenieurs Civils de France.
Membre de la American Society of Heating and Ventilating Engineers.
Membre de la National District Heating Association.