MIL-HDBK-1003/6
Table 2
Advantages and Disadvantages of HTW Plants and Steam Plants
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*
*
High Temperature Water
Steam
*
*
Advantages
Advantages
*
*
* 1. Minimal system water loss; therefore 1. Steam system operation more *
familiar to most operators. *
*
makeup primarily required for losses
*
*
from pump glands, valve packing,
*
*
expansion tank overflow.
2. Less pumping horsepower
*
*
required.
* 2. Supply and return water thermal
*
*
*
energy is retained in system
3. Provides energy for uses
*
*
and not lost through leaking
other than heating; i.e.,
*
*
traps, condensate losses, PRV
turbine driven equipment.
*
*
stations and flashing.
*
*
*
* 3. If desirable or necessary,
4. Fewer and less complicated
*
*
heat storage in system will
controls.
*
*
allow continued operation
*
*
for a period of time after
5. Usually considered safer
*
due to possibility of highly *
heat input has been cut off.
*
dangerous rupture with HTW. *
* 4. Temperatures of the HTW and space
*
*
*
conditions can be closely controlled.
*
*
* 5. Systems will respond to quick
*
*
*
load swings.
*
*
* 6. Heat storage (fly wheel) effect can
*
*
*
can reduce size of HTW generators.
*
*
* 7. Water treatment requirements are
*
*
*
minimal in closed circulation loop
*
*
systems.
*
*
* 8. No deaeration required.
*
*
*
* 9. No steam traps or pressure reducing
*
*
*
stations required.
*
*
* 10. Distribution system can more nearly
*
*
*
follow natural topography.
*
*
* 11. Boiler blowdown not required for HTW
*
*
*
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