Dri-Eaz Dri-X Airchanger Panduan Pemilik - Halaman 9

Jelajahi secara online atau unduh pdf Panduan Pemilik untuk Dehumidifier Dri-Eaz Dri-X Airchanger. Dri-Eaz Dri-X Airchanger 12 halaman.

Halaman Cetak

1. Operating Principles

E S TIMA T IN G WAT E R RE MOV AL

The Dri-X can be very efficient as a dehumidi-

fier. Its rate of water removal depends on how

much drier the outdoor air is when compared to

the indoor air. The Water Removal Chart below

shows the unit's power. Using the chart allows

comparing the rate of dehumidification to that of

refrigerant or desiccant dehumidifiers. When justi-

fying rental rates, the unit's value as an air cleaner

should be added in.

To estimate the unit's removal of water from a

humid indoor environment, use a thermo-hygro-

meter plus the Dri-X Airchanger Calculator, or a

psychrometric chart, table or calculator and the

Water Removal Chart below.

(Numbers given in the examples are accurate

calculations. When using a psychrometric chart,

numbers will be less exact. Use larger and more

detailed charts for more precise estimates.)

Step 1.

Measure the temperature and the relative hu-

midity both indoors and outdoors, using a thermo-

hygrometer. Example: You measure indoor condi-

tions at 70°F (21°C) and 70% Rh. Outdoors, your

readings are 59°F (15°C) and 40% Rh.

Step 2.

Convert your readings into grains per pound

using the Dri-X Airchanger Calculator, or a psy-

chrometric chart or calculator. This figure is often

called the specific humidity. Example: Using the

example above, the indoor condition is 77 gpp.

The outdoor condition is 30 gpp.

Step 3.

Subtract outdoor from indoor gpp. Look up this

number on the bottom scale of the Water Removal

Chart. Move up to the graph line, then left to gal-

lons per day, or right to pints per day. Example: In

this case, the difference between indoor and out-

door conditions is 77 gpp less 30 gpp, or 47 gpp.

(77 - 30 = 47.) Looking up 47 gpp on the graph,

you find that the water removal is 166 pints or

about 21 gallons per day.

IMPORTANT: The outdoor gpp must NOT be

higher than that of the indoors. This would mean

that the outdoor air is more humid – it is holding

more water vapor. Do not use the Dri-X Air-

changer in these conditions, because it will bring

additional water vapor indoors, which would raise

indoor humidity.

Water Removal Chart

Difference between Indoor s and Outdoor s , in GPP

Examples by Geographical Areas

Example 1. During early stages of a job in

Minneapolis during the winter, indoor conditions

are 75°F and 85% Rh. From your calculator or

chart you find that indoor specific humidity is 111

gpp (grains per pound). Outdoor conditions are

20°F (-4°C) and 25% Rh, for a specific humidity

of about 4 gpp. The difference is 107 gpp (111-

4=107). Reading from the Water Removal Chart,

the Dri-X is removing 377 pints or 47 gallons per

day.

Example 2. You're in Seattle. It's cool and

foggy outdoors where your measurements are

48°F and 85% Rh, or 42 gpp. Indoor conditions

are 70°F and 65% Rh, or 71 gpp. The outdoor air

is drier by 29 gpp (71-42=29). Water removal is

102 pints or 13 gallons per day, similar to a large

refrigerant dehumidifier used in the same room.

Example 3. In a Miami summer, the outdoor

air is 85°F with 70% relative humidity. Thus it

holds 128 gpp of water vapor. Indoor conditions

are 70°F and 90% Rh, or 99 gpp. Don't be fooled

450

400

350

300

250

200

150

100