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DSHD Series - Heatless Modular Desiccant Air Dryers

DRYERS - COMPRESSED AIR / DESICCANT COMPRESSED AIR DRYERS

DSHD Series Modular Desiccant Air Dryers are ideal for point of use, laboratories and confined areas. They provide a continuous supply of dry compressed air by automatically cycling the flow of air through two desiccant beds.

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Features

Deltech’s DSHD Series Modular Desiccant Air Dryers protect moisture sensitive applications requiring low pressure dew points. Delivers dew points of ISO 8573-1: 2010 Class 1 (-94°F, -70°C) and Class 2 (-40°F, -40°C) with flow rates of 7 to 40 scfm (12 to 68 nm3/h). Critical applications include labs, hospitals, pharmaceutical manufacturing and other high-tech installations.
The DSHD Series incorporate a time proven design, with superior features and reliability, in a compact and easy to install package. Standard features include:

Theory of Operation

Compressed air enters the dryer and is directed to Tower 1 by valve (A), and then to the dryer outlet through shuttle valve (B). A portion of the dried air is throttled to near atmospheric pressure by means of orifice (C). This extremely dry, low-pressure air flows through and regenerates the desiccant in Tower 2 and is exhausted through purge/repressurization valve (D) and exhaust muffler (E) to atmosphere. After a set time, the automatic solid state timer closes purge/repressurization valve (D) allowing Tower 2 to repressurize slowly. At the end of 2 minutes, valve (A) shifts and purge/ repressurization valve (D) reopens. The main air flow is now dried by Tower 2 while Tower 1 is being regenerated.

Specifications

TABLE 1 - INLET & PURGE FLOWS @ 100 PSIG 

Model INLET FLOW RATING1
SCFM (NM3/H)		 PURGE FLOW2
SCFM (NM³/H)		 IN/OUT
CONNECTIONS
-40°F (-40°C) -94°F (-70°C) Average Maximum IN
DSHD-7 7 12 5 8 1.5 2.3 1.8 2.7 1/2" NPT
DSHD-13 13 22 9 15 2.7 4.5 3.7 5.1 1/2" NPT
DSHD-18 18 31 12 20 3.7 5.7 4.4 6.5 1/2" NPT
DSHD-21 21 36 14 23.5 4.6 7.2 5.4 8.1 1/2" NPT
DSHD-27 27 46 18 30.5 5.3 8.3 6.2 9.2 1/2" NPT
DSHD-40 40 68 27 45.5 9.7 15 11.6 16.1 1/2" NPT

1 Inlet flows are established in accordance with CAGI (Compressed Air and Gas Institute) standard ADF-200, Dual Stage Regenerative Desiccant Compressed Air Dryers - Methods for Testing and Rating. Conditions for rating dryers are: inlet pressure - 100 psig (7 kg/cm2); inlet temperature - saturated at 100°F (38°C).

2 Average Purge Flow is the total amount of air used to purge and repressurize off-stream towers averaged over the cycle time. Maximum Purge Flow is the flow rate through the off-stream tower during that portion of the cycle the purge/ repressurization valve is open.

TABLE 2 - INLET & PURGE FLOW CORRECTION FACTORS

INLET
PRESSURE		 psig 50 70 90 100 110 120 130 150
kg/cm2 3.5 4.9 6.3 7 7.7 8.4 9.1 10.5
MULTIPLIER A 0.31 0.54 0.83 1.00 1.09 1.17 1.26 1.44
MULTIPLIER B 0.55 0.73 0.91 1.00 1.09 1.17 1.26 1.44

CAPACITY CORRECTION FACTORS

  • To determine maximum inlet flow at inlet pressures other than 100 psig (7 kg/cm2), multiply inlet flow from Table 1 by multiplier A from Table 2 that corresponds to system pressure at inlet of dryer.
  • To determine purge flow at inlet pressures other than 100 psig (7 kg/cm2), multiply purge flow at 100 psig (7 kg/cm2), from Table 1 by multiplier B from Table 2 that corresponds to system pressure at inlet of dryer.
  • To determine outlet flow capacity, subtract purge flow from inlet flow.

Dimensions

DSHD-7

MODEL  DIMENSIONS WEIGHT
H W D
IN MM IN MM IN MM LBS KG
DSHD-7 19 494 14 346 7 168 77 35

DSHD-13

MODEL  DIMENSIONS WEIGHT
H W D
IN MM IN MM IN MM LBS KG
DSHD-13 26 666 14 346 7 168 93 42

DSHD-18

MODEL  DIMENSIONS WEIGHT
H W D
IN MM IN MM IN MM LBS KG
DSHD-18 35 884 14 346 7 168 112 51

DSHD-21

DSHD-27

DSHD-40

Downloads

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Heatless Modular Desiccant Air Dryers DSHD Series - 7 to 40 sfcm (12 to 68 m3 /h)