Andrew Mongar

18-Oct-2018, 9:00 - 9:30AM

Session: New Energy Savings Technologies

Track L | Emerging Energy Trends

Humidity Issues in Buildings and Research Results of Third Generation Liquid Desiccant Technology

Andrew Mongar
Airgreen, Inc.


Humidity is the primary determinant of building comfort and health. If humidity could be properly controlled with existing technologies, people would set their thermostats at 74F or higher in summer. Why aren’t they? Thermostats have to be lowered to compensate for high relative humidity levels in buildings. The humidity control provided by traditional HVAC equipment does not meet comfort and health requirements. The presenter will provide an overview of humidity issues with existing HVAC technology in new and existing buildings. He will review research into Third Generation Desiccant Technology that provides a complete solution to both temperature and humidity control. Increases in energy efficiencies and moisture removal performance will be shown, as well as lower first cost for equipment. Revolutionary process design breakthroughs that allow the integration of low temperature heat recovery and renewable energy into the equipment design will be discussed. Existing and newly built buildings suffer from problems in handling latent loads in almost all climatic regions of the World. Refrigerant compression systems remove humidity by cooling air to below the dew point. To perform humidity control, the air temperature is cooled to around 40oF and then reheated. This approach has three main drawbacks: the energy required to cool to these low temperatures is mostly wasted because of the reheat required; equipment is costly; and the underlying humidity problem is only partially solved. Humidity problems in buildings are becoming worse because sensible heat ratios required by buildings are falling due to better insulated buildings, energy efficient lighting, and increasing amounts of Outside Air to meet Standards. However, conventional systems operate best when SHRs are above 70%. Energy conservation measures are reducing the sensible load at the same time as increased outside air is increasing latent (humidity) loads. The presenter will review research and testing results of Third Generation Liquid Desiccant Technology. Complete humidity and temperature control provides optimal comfort and health conditions. Energy efficiency is increased. Revolutionary process design breakthroughs allow the integration of low temperature heat recovery and renewable energy into the equipment design.


As the Founder of AirGreen Inc., Andrew is President and CTO and has been an energy innovator and senior R&D manager for over 30 years. His work has taken him from corporate innovation at British Gas to positions at the highest levels of government in the U.K. Cabinet Office and the European Commission where he set up programs of Technology Assessment. Andrew helped manage a small technology innovation company based in Phoenix and became an expert with liquid desiccant systems. Andrew is the technical leader on product performance and design of the "third generation" liquid desiccant system being pioneered by AirGreen. He was Program Chair of the ASHRAE Technical Committee on Desiccants. Andrew has a degree in Mathematics from Bristol University, UK and a Masters in Operations Research from Imperial College, London, UK. He also studied and taught International Business at Temple University. His career highlights include:

  • Three years as Energy R&D Advisor to Prime Minister Thatcher and European Union governments
  • 20-year career in corporate innovation at British Gas
  • 16 years in two start-up technology development companies.



    Track: L Emerging Energy Trends | Session: New Energy Savings Technologies


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