Innovation in Ultra-Efficient Air-Conditioning Crista Shopis - - PowerPoint PPT Presentation

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Feb 03, 2024 381 likes •551 views

Innovation in Ultra-Efficient Air-Conditioning Crista Shopis Advanced Energy Conference October 13, 2011 The Challenge Air conditioning = 16% of energy use and large system load peaks. The Challenge Air Conditioning = Reducing Air

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Crista Shopis Advanced Energy Conference October 13, 2011

Innovation in Ultra-Efficient Air-Conditioning

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Air conditioning = 16% of energy use and large system load peaks. The Challenge

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Air Conditioning = Reducing Air Temperature + Dehumidification

The Challenge

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Source of the Idea: Cool Ground Temperatures

“Free” source of “coolth”
But: Well water temperatures

not cold enough to dehumidify directly

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The Idea If we split an air stream, heat one of the two streams, and then pass both through a desiccant wheel, the heated and humidified air stream dewpoint will rise above the temperature

f ground water.

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In Slow Motion

If we split an air stream, heat one of the two streams, and then pass both through a desiccant wheel, the heated and humidified air stream dewpoint will rise above the temperature of ground water.

COOLING COIL GEOTHERMAL COOLING COIL WATER MOISTURE CONDENSATE DESICCANT WHEEL HEAT SOURCE AIR FROM BUILDING AIR TO BUILDING

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Psychrometric Chart

Enthalpy, Btu/lb(a) Saturation temperature, F Humidity ratio, lb/lb(a) Pressure: 14.6959 psi Dry bulb temperature, F 50 60 70 80 90 100 110 120 130 140 150 0.010 0.020 0.030

2 % 4 % 60%

20 30 40 50 60 70 40 50 60 70 50 60 70 80

1 2 3 4 5 8 6 9 7

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Efficiency – Original Projection

COEFFICIENT OF PERFORMANCE (COP) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Geothermal Desiccant Cooling (Natural Gas Fired) Ventilation Cycle Desiccant Cooling Absorption Cooling COP

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Efficiency – Lab Results Efficiency: 1.85 COP Sensible Heat Ratio: 0.74

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Other Findings Independent Temperature vs. Humidity controllability is

utstanding

Sensible Heat Ratio from 0 – 1.0 Typical air conditioner’s maximum Sensible Heat Ratio is about 0.75

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The Vision: A simple four pipe fan coil Possible heat sources: Boiler Solar Waste heat 60°F cooling “sink”: Geothermal Lake Ocean Low-lift chiller Industrial dehumidifier

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US Potential

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Summary

A new cooling cycle
Efficiency over 1.8 COP,

likely higher

Heat-fired: Fossil-fuel,

solar, waste heat

Quiet (no compressor)
Outstanding humidity control
A possible path to zero-energy buildings

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Support – Thank You

Taitem Engineering:
Idea
Prototype development
Continued technical and business

support

NYSERDA:
Feasibility Study
Demonstration project
Syracuse Center of Excellence
Technology Application and

Demonstration

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…The future of air conditioning is here

Questions?