Heat Recovery

Heat Recovery

Clean Air Designs


Clean Air Designs Inc is dedicated to developing and producing cost-effective energy recovery ventilation products that improve indoor environments.  They can construct and design custom products or supply catalogue products for institutional, commercial, and industrial applications.  They also offer a myriad of heating, cooling, dehumidification, humidification, and filtration pre and post conditioning options.

Their product lines and expertise are broad enough to offer three different recovery devices; heat pipes, total enthalpy wheels, or air-to-air plate type heat exchangers, so you can choose the best device for the application.

Flexibility, price and the growing mandate to implement energy conservation devices have created an ideal catalyst for the phenomenal growth that Clean Air Designs Inc. has experienced over the last year and will continue to experience in the coming years.



Greenheck is the leading supplier of air movement and control equipment that includes fans, dampers, louvers, kitchen ventilation hoods, and energy recovery and make-up air units. Greenheck equipment is used in all types of commercial, institutional, and industrial buildings in applications from comfort ventilation to manufacturing processes.

Greenheck energy recovery products provide fresh outdoor air to meet ASHRAE 62 ventilation rates, while recovering energy from the exhaust air stream.  The benefits include improved indoor humidity levels, reduced energy costs and lower first cost for air conditioning (due to reduction in outdoor air load).

Many designers have realized the benefits of energy recovery.  In addition to complying with ASHRAE 62-1999 while controlling operating expenses, a properly designed ventilation system that incorporates total enthalpy recovery will realize the following benefits:

  • Control Indoor Humidity — with the high percentage of outdoor air mandated for commercial and institutional buildings, controlling indoor humidity levels can become a challenge. Applying an ERV to the system reduces the latent load of the outdoor air entering the space.
  • Control Initial Cost — because the ERV reduces the outdoor air load (both sensible and latent), the cooling equipment size may be reduced, which leads to an initial cost reduction.


Greenheck is known worldwide as the leading manufacturer of air-movement and control equipment.  Its flagship ventilation products are typically found behind walls, in ductwork or on the roofs of hospitals, office buildings, hotels, shopping malls, restaurants, schools, industrial plants and other commercial buildings.  Their function, basically, is to move air in, out and around a building — making life inside a lot more pleasant.

Des Champs


Des Champs Laboratories was founded in East Hanover, New Jersey in 1973 by Nicholas H. Des Champs, Ph.D. for the purpose of developing a patented, vacuum brazed aluminum heat exchanger that could be easily formed into any shape.  To generate income, several contract jobs, unrelated to the original patent, were undertaken. One of these contracts dealt with designing and building a prototype heat exchanger that would be used to cool the cockpit of an F-15 fighter aircraft while the plane was operating prior to takeoff and after landing.  It was during this contract that the
Z-DUCT® air-to-air heat exchanger was conceived.

The Present and Future for Des Champs Technologies
The company now produces products for the Commercial, Institutional, Industrial, and Original Equipment Manufacturer (OEM) markets. Its products are marketed under trade names such as: WRINGER®, MOACS®, CompleVent®, E-Z-Aire®, ThermoZ®, VariMax®, and Z-DUCT®.

Exhaust recovery ventilation products utilize energy from the exhaust air stream to precondition the outside air being introduced into the building.  In the winter it provides free heating and in the summer free cooling.

DesChamps heat exchangers offer designs utilizing plate counterflow heat exchangers, heat pipe, and energy recovery wheels.  These heat exchangers form the backbone of many system configurations and can be configured with unique traversing frost prevention.  DesChamps heat exchangers have been used everywhere from the hottest climates to Antarctica.

CompleVent can provide the ventilation and dehumidification required by ASHRAE Standard 62, while minimizing operating costs. Air-to-air energy exchangers used by the CompleVent serve to reduce loads on heating and cooling systems.  Six different CompleVent designs are available to meet a variety of applications based on climate and function. Because of its efficient energy recovery technology, CompleVent can provide the fresh air required for a healthy indoor environment with minimal increase in your energy bill.

Annex Air


The state of the environment is a concern for all of us, and the enormous ecological challenges facing industrialized societies can only be dealt with by the joint efforts of science, government and industry.

Over the last few years, protection of the environment has reached a high standard in North America with the adoption of many laws regarding air, water and ground pollution.  Yet, we have not accomplished as much as we should have in trying to reduce the combustion of fossil fuels and avoiding wastes that are at the heart of many production processes.

It is to everyone’s benefit to reduce environmental pollution as much as possible through reorientation, inventiveness and efficiency.  We must always be aware that the best environmental technologies reduce pollution at its source.  Annexair strives towards this ideal by providing products that recover energy and therefore contribute to diminishing energy consumption, while at the same time improving indoor air quality, thereby benefiting man and nature. This is our ultimate objective.

Annexair’s commitment to conserving the environments is also manifested in their design and production principles: Avoiding the use of polluting processes and designing our units for maximum efficiency together with minimal weight and raw material use.

With imagination and technological innovation we can build a better world for our children… together.

The energy recovery wheel is the main technology implemented in Annexair’s units.  This is a high efficiency energy transfer device that constitutes the most economical way to comply with energy saving requirements in many applications.

Through the years, Annexair has acquired substantial experience in designing and building wheel-based ventilators.  Their wheels are purchased from leading manufacturers in the world.  All wheels feature an integral bearing and maintenance free drive motor.  The wheel casing includes low-leak full contact seals made of ultra-high molecular weight material.  A factory-adjusted double purge sector reduces carry over to 0.1%.

Doucette Industries


In 1976, Doucette Industries, Inc. entered the heat recovery market with a device designed to recover energy from air conditioning and refrigeration systems and used to heat potable water.  This device, called a Desuperheater / Water Heater was upgraded in 1977 to include the vented double wall to preclude water contamination and refrigeration system damage.  It was the first such device to win an Underwriters Laboratory listing and to meet nationwide health codes.  In 1978, the mechanically cleanable vented double wall heat exchanger was introduced to the solar energy market and other markets and won immediate acceptance by all municipal, county, state and federal agencies.  A patent was granted on the vented double wall heat exchanger on July 1, 1980.

The Doucette Industries CADS Series Ammonia Desuperheater/Water Heater™ delivers cost-effective energy savings by heating potable water through the recovery of waste heat from industrial refrigeration systems.  The CADS unit supplements potable hot water heating used for process applications by capturing “superheat” which accounts for approximately 10% to 15% of the total system heat of rejection. The CADS Series can effectively heat the water up to 140 degrees F.

  • Food Processing Plants
  • Food Distribution Plants
  • Beverage Plants
  • Ice Rinks


Extends Your Hot Water Capability Inexpensively

  • Lowers hot water heating costs by utilizing waste heat
  • Heats potable water up to 140 °F
  • Reduces refrigeration operating costs 3% to 5%
  • Typical Payback Period of Two Years or Less
  • Vented double-wall construction prevents cross contamination
  • UL and USDA Listed with CRN


Installation of a Doucette Desuperheater/Water Heater™ into your existing cooling configuration is equivalent to adding 15% more condenser capacity.  The result is a 3% to 5% reduction in refrigeration operating costs, enhanced condenser performance and prolonged compressor life.

Field-Proven Performance and Reliability
The CADS Series utilizes efficient counterflow design with low refrigerant pressure drop for efficient operation. Vented double-wall 304L Stainless Steel tube construction guarantees Desuperheater compliance with all code requirements and prevents cross-contamination between working fluids.  The CADS Series includes positive oil and liquid refrigerant return design for compressor protection, and the unit is equipped with high pressure water fittings for mechanical cleaning.



Enviro-Temp is the latest in a long line of industry-leading innovations from Turbotec Products, Inc.  They are the only resource you need for high-performance, high-quality heat exchanger products for virtually any space conditioning, refrigeration, plumbing, and water heating application.  For more than 35 years, Turbotec has been a leader in innovative heat exchange technology.

Hot water from a cooling system?
It sounds counterintuitive, but it’s really quite logical. While a central air conditioning or refrigeration system cools the air, it creates a lot of excess hot waste gas. But with Enviro-Temp, that hot gas isn’t wasted. Instead, it is diverted through our vented double-wall heat exchanger, where it safely and efficiently heats commercial hot water for free, dramatically reducing the use of the existing water heating system. Enviro-Temp is environmentally friendly, eminently practical, and exceptionally engineered.

Hot water is just the beginning.
In addition to hot water, Enviro-Temp also delivers longer compressor life and greater A/C or refrigeration system efficiency. Because Enviro-Temp returns the hot gas to the cooling system at a much lower temperature, the compressor doesn’t work as hard to cool it, the system draws less power, and work load is reduced — increasing efficiency, reducing the carbon footprint and decreasing dependency on fossil fuel.

Where can Enviro-Temp be used?
Enviro-Temp is easy to add to new or existing commercial or industrial applications or to any facility that utilizes air conditioning.  Enviro-Temp is ideally suited for restaurants, laundries, sports complexes, hotels, medical facilities, schools and other commercial uses.

Enviro-Temp’s small footprint is the perfect match for 10 to 200 ton commercial/ industrial A/C system. It is best suited for establishments where A/C use is greater, resulting in a typical ROI of one to three years. Geography is less of a factor where Enviro-Temp is used with a commercial refrigeration system in the 120,000 to 240,000 Btu/h range, and ROI is typically one year or less.



After space heating, water heating is the second most costly energy demand in homes, accounting for 20-30% of energy consumption. Likewise, drain-water is easily one of the largest overlooked sources of energy savings in commercial and commercial enterprises. Approximately $40 billion dollars goes down the drain in North American each year.

When warm water goes down the drain, it carries away valuable energy with it.  Ninety percent of the energy used to heat water in a home can be washed out to the sewer.  Drain-water heat recovery (DWHR) systems can re-capture some or most of this valuable energy and use it to preheat cold fresh water.  There are many ways that DWHR units are deployed in commercial and industrial installations, while there is one primary and simple method for residential installations.
Based on their patent pending technology, the Power-Pipe® brings you high performance energy savings with ultra-low pressure loss  Few, if any other manufacturer of drain-water heat recovery technology can say that! heatrecovery_clip_image015

Heat Pipe Technology


Heat Pipe Technology, Inc. was founded by president and inventor Khanh Dinh in 1983.  With funding from private investors and a grant from the Department of Energy, HPT began research on new uses for heat pipes, a passive heat transfer device previously used in various applications ranging from orbiting satellites to the Alaskan Pipeline ground spikes.  By applying the principle of heat pipes to air conditioning systems, the dehumidification performance and efficiency was greatly enhanced, with moisture removal increased by 30 to 50%.

Projects to follow proved the technology could be applied on any scale, while being commercially viable and practical to implement.  While humidity control became a widely recognized requirement for indoor air quality in all modern buildings, heat pipes were proving to be the most cost effective and efficient method of dehumidification in the world. Compared to other dehumidification technology, HPT heat pipes can save up to 50% of the energy normally consumed.

Heat pipes may be described as having two sections: precool and reheat.  The first section is located in the incoming air stream.  When warm air passes over the heat pipes, the refrigerant vaporizes, carrying heat to the second section of heat pipes, placed downstream.   This entire process of precool and reheat is accomplished with no additional energy use.  The result is an air conditioning system with the ability to remove 50 to 100% more moisture than regular systems.

Heat pipes have been used successfully in a variety of HVAC design applications over the past 15 years for passive dehumidification – ranging from 2 ton residential units to 230 ton commercial applications.

HPT has a complete line of packaged dehumidifiers, wrap- around heat pipes, controllable heat pipes, and heat recovery systems.  Heat pipe products provide the following benefits:

  • Free precool and reheat
  • No heat added to conditioned space
  • Allows entire system to work more efficiently
  • Increases latent capacity without additional energy consumption
  • Dehumidifies air entering the ductwork.  Helps better meet the ASHRAE 62-1999 Standard.
  • No moving parts to break down or wear out
  • Often allows downsizing of entire HVAC systems
  • Helps prevent IAQ problems associated with high humidity


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