DriSteem Vaporstream Especificaciones descargar pdf (Pagina 42)

P a g e 3 8 • D R I - S T E E M D e s i g n G u i d e

D R I - S T E E M D e s i g n G u i d e • P a g e 3 9

Table 38-1:

How fill water type affects performance, maintenance, steam quality, and efficiency in isothermal humidification

systems

Fill

water type/

conductivity

Skimming

required?

(Y/N)

Drain/ush

frequency

Hardness

performance

(control range)

Maintenance

requirements

Humidication

steam quality

Water and

energy

efciency

Potable

(minimum

conductivity

100 µS/cm)

Y System with a

manual drain:

Humidier typically

drains one time

per season, but

may need to

increase drain and

ush frequency

based on quarterly

inspections,

especially with

water over 12 gpg

(205 mg/L).

2-35 gpg

(35-600 mg/L)

±3% of set point

with service

interrupted by

draining and

ushing

If water is harder

than 12 gpg

(205 mg/L), scale

buildup occurs

quickly. Increasing

skim and drain/ush

cycles helps reduce

scale, as does regular

cleaning. The key

is to skim or ush

minerals while they

are still in solution

and before they

attach to humidier

components as scale.

As pure as the ll

water. Dissolved

solids may transfer

to the airstream with

humidity vapor.

As water hardness

increases so does the

need for skimming

and draining, thus

increasing water

and energy usage,

for makeup water

replacing water

lost to skim and

ll cycles must be

heated. In addition,

performance

degradation can

occur in heat

exchanger-based

systems if the heat

exchanger becomes

coated with mineral

scale.

Potable

(minimum

conductivity

100 µS/cm)

Y System with auto

drain and ush:

Several times per

season.

2-35 gpg

(35-600 mg/L)

±3% of set point

with service

interrupted by

draining and

ushing

Softened

(minimum

conductivity

100 µS/cm)

Y System with a

manual drain:

Humidier typically

drains one time

per season, but

may need to

increase drain and

ush frequency

based on quarterly

inspections.

2-12 gpg

(35-205 mg/L)

±3% of set point

with no service

interruption

Can go up to two

years without

cleaning, but

quarterly inspections

are encouraged

to verify softener

operation. Drain,

ush and skim

frequency/duration

affect maintenance

requirements.

As pure as the ll

water. Dissolved

solids may transfer

to the airstream with

humidity vapor.

As water hardness

increases so does the

need for skimming

and draining, thus

increasing water

and energy usage,

for makeup water

replacing water lost

to skim and ll cycles

must be heated.

Softened

(minimum

conductivity

100 µS/cm)

Y System with auto

drain and ush:

Several times per

season.

2-12 gpg

(35-205 mg/L)

±3% of set point

with no service

interruption

High purity

(DI/RO)

N Typically need to

drain one time per

season.

0-2 gpg

(0-35 mg/L)

±1% of set point Cleaning typically

not required, but

quarterly inspections

are encouraged

to verify ltration

operation.

Pure humidication

steam. Steam

generated by an

isothermal process

is more pure than

humidication

produced by an

adiabatic process.

Efcient, because

there is no water

used for skimming

or drain/ush cycles.

However, a very

small amount of

water regularly

overows to keep

the P-trap lled.

Boiler steam

(direct

injection)

N/A N/A N/A ±1% of set point Yearly inspection.

Typically, no other

regular maintenance

is required.

Efcient, because an

existing boiler can

be used.

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