ВУЗ:
Составители:
Рубрика:
117
three-hour turnover to the learners' pool. The temperature in the hall is main-
tained several degrees higher than that of the water and a plenum ventilation
supplies 2
1
/
2
changes of fresh air without recirculation. The extract system is
planned to give three air changes an hour but can be increased to four air
changes. The plenum plant is supplemented by underfloor electric heating.
Superstructure of the hall is steel with lattice girder roof member
spanning 115 ft. The refreshment block is also concrete encased steel
framed construction and has reinforced concrete floor and roof slabs.
The main pool, diving bay and learners' pool and changing room block
are of reinforced concrete construction.
Panel heating
Heating and ventilation are two branches of engineering which are very
closely connected, they are therefore treated as a dual subject. Both are con-
cerned with providing a required atmospheric environment within a space, the
former with respect to heat supply to produce a desired temperature for main-
taining comfort, health or efficiency of the occupants, the latter with regard to
supply and removal of air frequently with emphasis on contamination of the air.
Air-conditioning is closely related to both heating and ventilation and will
therefore be dealt with later.
It is for heating to prevent the too rapid loss of heat from the body. By
heating, the ambient air of walls, ceiling or floor the rate of heat loss from the
body is controlled. Some old concepts of heating were gradually changed since
engineers obtained more precise knowledge about how the body loses heat. In-
sufficient attention was paid formerly to loss by radiation, which is the trans-
mission of energy in the form of waves from a body to surrounding bodies at a
temperature. The human being also loses heat by conduction (through his
clothes) and convection, the latter by air currents not only past his skin or out-
side clothing surface but also by evaporation of moisture from his skin (respira-
tion). The determination of the capacity or size of the various components of
the heating system is based on the fundamental concept that heat supplied to a
space equals heat lost from the space. The most widely used system of heating
is the central heating, where the fuel is burned in one place - the basement or a
specially designed room and from which steam, hot water or warm air is dis-
tributed to adjacent and remote spaces to be heated.
Страницы
- « первая
- ‹ предыдущая
- …
- 115
- 116
- 117
- 118
- 119
- …
- следующая ›
- последняя »
