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PCM COMBINATION

Phase change type air dryer, it only runs when it's needed, so the cost of electricity is 1/10

Optimum dew point with lowest energy cost!
Energy savings are now a necessity, not an option.
This world’s first patented technology developed by SPX FLOW produces super-dried air (up to – 100℃ dew point) and yet is able to maintain lowest energy cost.

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Product Features

Optimum discharge air temperature without the use of after cooler.

Achieves a super dry dew point, as low as – 100℃.

Minimizes dew point spike during tower switch over.

Energy saving steps:

Drastically reduces energy consumption by pre-removing up to 75% of moisture by using the PCM dryer.
PCM dryer, cycles (on/off) are controlled automatically according to inlet load: e.g. lunch time, season change.
Reduces total energy consumption by operating PCM dryer alone if necessary. (except winter)
Reduces energy consumption by controlling the desiccant dryer cycle time according to outlet dew point, which corresponds to inlet moisture load.
Integrated high efficiency blower, which regenerates with ambient air. No purge loss.

Operating Fundamental

Phase change in PCM dryer

When a refrigeration compressor and condenser fan are running, the cold refrigerant in the chiller (evaporator) cools the liquid Phase Change Material(PCM) and it gradually freezes.
When a PCM is sufficiently cooled and frozen, the refrigeration compressor and condenser fan stop.
The compressed air is continuously cooled by the PCM while the refrigeration compressor is inactive. No power is consumed during this period.
The PCM gradually melts as it adsorbs heat from the compressed air, and when fully melted, the refrigeration compressor and condenser fan resume to cool down the PCM.

Dehydration of Compressed Air

Compressed air saturated with water vapor enters reheater, and is pre-cooled by the outgoing chilled air.
It is then directed to chiller where it is further cooled by the Phase Change Material (PCM).
As the air is cooled, water vapor condenses into liquid droplets, which are then removed by high efficiency integral moisture separator with a NO Loss Drain.
Chilled air enters the heated desiccant tower to dry and supply lower than guaranteed dew point of -40℃ or -70℃.
Dried air returns to the PCM dryer’s reheater, where it is reheated with very low dew point. This in turn, supplies clean and dry compressed air to point of use.

Desiccant Dryer VS PCM COMBINATION
Dryer Type	Flow Capacity [Nm3/hr]	Power Consumption [kW]	Purge Air [%]	Regeneration Time [hr]	Daily Power Consumption [kW]	Daily Energy for Purging [kW]	Annual Power Consumption [USD]	Energy Saving [%]
Heated Purge	14,000	120 (Heater 120)	15	4 (Drying 3 + Cooling 1)	2,160	5,880	352,152	68%
Combination Heated Purge	14,000	96 (Heater 42 + PCM Dryer 54)	5	16 (Drying 10 + Cooling 3 + Stand by 3)	1,019	1,593	114,375	68%

Blower Purge	14,000	197 (Heater 179 + Blower 18)	15	4 (Drying 3 + Cooling 1)	3,546	1,470	219,700.80	68%
Combination blower Purge	14,000	111 (Heater 46 + Blower 11 + PCM Dryer 54)	5	16 (Drying 10 + Cooling 3 +Stand by 3)	1,244	368	70,575	68%

Blower Non-Purge	14,000	250 (Heater 230 + Blower 20)	0	6 (Drying 4.25 + Cooling 1.25 + Parallel 0.5)	4,350	0	190,530	59%
Combination Blower Non-Purge	14,000	135.5 (Heater 74 + Blower 7.5 + PCM Dryer 54)	0	16 (Drying 11 + Cooling 4 + Stand by 1)	1,779	0	77,900	59%

※ Purge cost USD 0.01 per 1 Nm3/hr ※ Power cost USD 0.12 per kW/hr ※ PCM dryer energy saving of 70% ※ Daily energy for purge air [kW] : (purge flow rate x purge cost) ÷ power cost ※ Following figures varies on customer’s environment

Above table shows an energy savings comparison rate between a desiccant and a PCM COMBINATION without changing the dryer type.
The below example shows the detailed energy cost, when a heater purge dryer is converted into a PCM COMBINATION- blower non-purge.
AS a result, energy saving are maximized when a desiccant dryer is converted to a PCM COMBINATION along with their types.

Heated Purge Energy Cost (Annual)
Total 124,173 + 343,392 USD 467,565
Electric HeaterUSD 124,173 189kW x (2.5hr ÷ 4hr) x 24hr x 365day x 0.12$/kW)
Purge AirUSD 343,392 (14,000Nm3/hr x 20%) x (24day x 0.014$ ÷ 0.12$/kW) x 365day x 0.12$/kW) .

PCM COMBINATION Blower Non-Purge Energy Cost (Annual)
Total 53,480 + 7,391 + 17,029 USD 77,900

PCM COMBINATION Blower Non-Purge Energy Cost (Annual)
Total 53,480 + 7,391 + 17,029 USD 77,900
Electric HeaterUSD 53,480 (74kW x (11hr ÷ 16hr) x 24hr x 365day x 0.12$/kW)
BlowerUSD 7,391 (7.5kW x (11+4)hr ÷ 16hr) x 24hr x 365day x 0.12$/kW)
PCM DryerUSD 17,029 (54kW x Average utilization rate 30% x 24day x 365day x 0.12$/kW)

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