Heat Pipe Heat Exchangers

Heat Pipe
Bry-Air heat pipe is a self-contained passive energy recovery device. A heat pipe can transfer up to 1000 times more thermal energy, than copper, the best known conductor; that too with less than -17oC per foot temperature drop. One of the amazing features of the heat pipes is that they have no moving parts and hence require minimum maintenance. They are completely silent and reversible in operation and require no external energy other than the thermal energy they transfer. Heat pipes are ruggedly built and can withstand a lot of abuse.


Construction
The Bry-Air heat pipe comprises of three elements... a sealed container, a capillary wick structure and a working fluid. The capillary wick structure is integrally fabricated into the interior surface of the container tube.

Due to the pressure gradients thus created within the heat pipe by the rapid generation of vapour near the surface, the excess vapour is forced to a remote area within the heat pipe having low temperature and pressure. The vapour then travels to the other end of the pipe where the thermal energy is removed causing the vapour to condense into liquid again, thereby giving up the latent heat of the condensation. This part of the heat pipe works as the condenser region. The condensed liquid then flows back to the evaporator region to be reused, thus completing a cycle.

Heat is removed from the external surface of the condenser region by conduction, convection or radiation. The heat pipe works continuously in a close-loop condensation/evaporation cycle and thus, the capillary pumping force is established within the wick structure that returns the working fluid from the condenser region to the evaporator region. The transfer efficiency level of each heat pipe is 99%.

Unique Finned Construction

Bry-Air heat pipe has a unique integrated fin construction providing significant advantage over plate fin or duplex fin design. Specifically, tube and fin bond resistance is eliminated to maximise thermal transfer efficiency. Cleaning is greatly simplified. The integral fin smooth surface simplifies application of protective phenolic coatings. For almost every application, you are sure that the Bry-Air heat pipes provide you all benefits of this advanced heat transfer technology.

Heat Pipe Heat Exchanger

Bry-Air industrial and commercial heat pipe heat exchanger contains a number of heat pipes. These heat pipes are placed horizontally across the width of the exchanger and pass through a center seal partition to avoid cross contamination. The exchanger is installed across two side-by-side air ducts. The exhaust air and the supply air are discharged in counter flow direction across the exchanger through the ducts to facilitate the maximum energy transfer. The heat pipes pick up the thermal energy from the exhaust (evaporator region) and transfer it to supply air (condenser region).

Bry-Air heat pipe heat exchanger can recover up to 85% of exhausted thermal energy. However under ideal conditions the thermal efficiency of an economic system ranges between 55% to 70% and saves millions of BTUs year after year.

Bry-Air heat pipe heat exchangers as standard are suitable for air-to air heat recovery for a temperature range of - 10°C to + 260°C. With special materials of construction for the tube, the exchanger can be designed to extend the range to 427°C to 482°C.

INDUSTRIAL APPLICATIONS

Process to Space Heating
Bry-Air heat pipe heat exchangers transfer the thermal energy from process exhaust for building heating. The pre-heated air can be blended if required. The requirement of additional heating equipment to deliver heated make - up air is drastically reduced or eliminated.

Process to Process

Bry-Air heat pipe heat exchangers recover waste thermal energy from the process exhaust and transfer this energy to the incoming air thus becomes warm and can be used for the same process/ other processes, and reduces process energy consumption.

 

Typical Industrial Applications

Annealing furnaces	Reverberatory furnace
Bakery Oven Boiler Brick Kiln Chemical fluid bed dryer Dehumidifier Epoxy coating curing Oven Foundry hot blast Fume scrubber Heater flue gas Heat treatment furnace Humber dryer Plastic laminate dryer Print dryer	Solvent boil off oven Spray dryer Textile cloth finishing oven Tanter frame textile drying oven Tumble dryer Veneer dryer etc.