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M-Cycle Dew Point Indirect Cooler Calculator HVAC
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M-Cycle Dew Point Indirect Cooler Calculator

Model Maisotsenko thermodynamic cycle heat exchangers, evaluate sub-wet-bulb sensible cooling with zero added moisture, and compute ultra-high EERs.

Working Air Fraction (%):
Total Fan + Pump Power (W):
Baseline DX AC EER (Btu/Wh):
Operating Altitude (ft):
Ambient Psychrometric State:
-

M-Cycle Performance & Cooling Delivery

Supply Air Temp (T_supply) -
Wet-Bulb Effectiveness -
Sub-Wet-Bulb Temperature Drop: -
Sensible Cooling Capacity: -
Tons of Refrigeration (Sensible): -
Supply Moisture Change: 0.0 gr/lb (100% Sensible)
Water Consumption Rate: -

Energy Efficiency & Power Draw Comparison

M-Cycle System EER: -
Equivalent COP: -
Baseline DX Compressor Power: -
Electrical Demand Reduction: -
Thermodynamic Milestone: Unlike conventional swamp coolers limited by ambient wet bulb (e.g. 70°F), the M-Cycle breaks the wet-bulb barrier by pre-cooling the working air, delivering cold supply air down toward the dew point (55°-62°F) without adding any moisture into the building.

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Thermodynamic Principles of the Maisotsenko Cycle (M-Cycle)

Conventional direct evaporative coolers are bound by the ambient wet-bulb temperature ($T_{wb}$) as a theoretical limit, while inevitably raising indoor humidity to uncomfortable levels. The Maisotsenko Cycle (M-Cycle) is an innovative indirect evaporative cooling process that uses specialized dry and wet channel heat exchanger geometry to break past the wet-bulb boundary, cooling product air toward the ambient dew-point temperature ($T_{dp}$) while keeping product air moisture content strictly constant.

How the M-Cycle Heat Exchanger Works

The M-Cycle uses a cross-counterflow plate heat exchanger:

  1. Product Air Passages (Dry Channels): Primary outdoor air flows through sealed dry channels, transferring heat sensibly to the adjacent wet channels. No water touches this airstream.
  2. Working Air Diversion: At intervals along the dry channel, a fraction of the already pre-cooled air (typically 25% to 35%) is diverted into adjacent counterflow wet channels.
  3. Sub-Wet-Bulb Heat Sink: Because the working air enters the wet channels already pre-cooled, its wet-bulb temperature is lower than the ambient wet-bulb temperature. As water evaporates into this pre-cooled airstream, it absorbs latent heat at continually lower temperatures, allowing the product air in the dry channel to be cooled below ambient wet bulb.

Effectiveness Metrics & Energy Economics

In traditional evaporative cooling, wet-bulb effectiveness $\varepsilon_{wb} \le 85\%$. In an M-Cycle, wet-bulb effectiveness commonly exceeds $100\%$ (typically $110\% - 130\%$):

\[ \varepsilon_{dp} = \frac{T_{db,in} - T_{db,out}}{T_{db,in} - T_{dp,in}}, \quad \varepsilon_{wb} = \frac{T_{db,in} - T_{db,out}}{T_{db,in} - T_{wb,in}} \]

Because no mechanical vapor compression refrigeration cycle is used (only low-power ECM fan motors and a fractional horsepower water distribution pump), the effective Energy Efficiency Ratio (EER) reaches 40 to 80 Btu/Wh, delivering up to $80\%$ electricity savings compared to standard DX air conditioners.

Frequently Asked Questions

Does an M-Cycle cooler add moisture to the indoor conditioned space?

No! The supply (product) air travels strictly through dry channels sealed from the water. Heat is transferred across the plate membrane into the working air channels, which exhaust all evaporated moisture outdoors. Indoor absolute humidity (grains per pound) remains 100% unchanged.

How does M-Cycle cooling achieve wet-bulb effectiveness above 100%?

Conventional evaporative coolers use ambient air to evaporate water, so they can never cool below ambient wet-bulb temperature. The M-Cycle diverts air that has already been pre-cooled in the dry channel into the wet channel. This pre-cooled working air possesses a depressed wet-bulb temperature, creating a deeper thermal sink that drives product air temperatures below ambient wet bulb toward ambient dew point.

What happens to M-Cycle performance on humid days?

Like all evaporative systems, the driving force is the wet-bulb depression (T_db - T_wb) and dew-point depression. In high humidity climates (e.g. 90°F with 75°F dew point), the cooling delta is smaller. In arid and semi-arid climates (Southwest US, Middle East, Mediterranean, Australia), M-Cycle can replace vapor-compression chillers entirely with 70-80% power savings.