Heat Pipe

Heat pipes is a heat-transfer passive device that employs phase transition from one location to another within closed-loop systems. They are used as heat recovery system.

Heat Pipe transmits heat using capillary & gravity action and the laws of thermodynamics. It is made up of a working fluid within an evacuated tube. The tube’s material is of high thermal conductivity, moving working refrigerant from the cold end (condensation) to the hot end (evaporation) of the heat pipe. The refrigerant within a heat pipe needs to have a low boiling point and a high latent heat of vaporization.

Heat Pipe circuits comprise multiple tubes connected in series, end-to-end for enhance performance.

ENERGY RECOVERY

H & M energy recovery heat pipes can be used for comfort applications for process applications.

e.g. In Comfort cooling application during Summer, incoming fresh air is pre-cooled, and enthalpy is reduced before the fresh air enters the room or the air conditioning unit that further performs heat and moisture treatment. (AHU). This enhance Dehumidification for Humidity Control. Pre-conditioning the fresh air by above method reduces the heat load of HVAC systems and save the building energy costs.

PASSIVE SYSTEM

Heat pipes contain no mechanical moving parts or the energy input to operate the heat pipes.

Temperature difference between the two air streams activates the heat pipes and causes them to exchange heat.

Heat pipe operation utilizes the working fluid phase change, from a liquid to a vapor and back again.

NO CROSS CONTAMINATION

HVAC systems play a crucial role to maintain healthy and comfortable indoor air quality (IAQ) in almost all buildings. Research shows good IAQ substantially helps improve productivity in business, raise grades in schools, and minimize hazardous pathogens in the air.

Air by-passing the heat pipe or leakage between the two sides of the heat pipe will reduce performance and may also carry particles, odors, and condensate between the two sides.

H & M heat pipes are suitable for all applications, especially where cross contamination is not acceptable. Airstreams can be located with a horizontal and/or vertical separation to completely isolate hazardous exhaust to fresh intake air.

Best practise design of the air handling unit must be made in such a way that there always will be a higher pressure on the supply side than on the exhaust side.

DESIGN OPTIONS

H & M offer heat pipes with variations in types, sizes, materials specification, fin pitch, circuiting and configurations to meet the customer requirement.

LOW MAINTENANCE

H & M heat pipes are low in maintenance, lower in operating costs and last a very long time.

Since the heat pipes have no moving parts no complex maintenance is needed. A periodic cleaning is sufficient.

H & M recommends Heat pipe surfaces must be kept clean on regular interval to maximize system performance & increase the life span of heat pipe.

Adding the Pre-Filters in both the supply and exhaust airstreams can reduce fouling, cleaning frequency hence trouble free operation.

Heat Pipe Types

• Wrap Around (Horse Shoe Type) Heat Pipe Heat Exchanger

H & M Wrap Around Heat Pipe system has two basic coils i.e. a pre-cool coil and a re-heat coil that are inter-connected and placed around the air handling unit’s cooling coil (chilled water or DX).

• the first pre-cool coil, precools the entering air before it goes through the AHU cooling coil.
• the precooled air approaches the AHU cooling coil at a lower temperature, lowering the cooling load on the coil or force a lower dew point to increase the AHU coil ability to remove moisture (latent energy)
• the AHU cooling coil cools the air further before being reheated by the second re-heat coil, using the same heat originally absorbed by the first coil.
• the reheated air from the re-heat coil reduce the energy cost by savings in resistive heating and provide required air temperature discharge to area.

Entire process of precool and reheat is accomplished with no additional energy due to the passive nature of the heat pipe. System ability to remove more moisture, control the humidity for better IAQ and energy savings.

• Horizontal & Vertical Heat Pipe Heat Exchanger

Material Specifications

H & M offers energy recovery heat pipes in sizes customized for the particular application. H & M heat pipes are manufactured from high quality copper tubes for durability with high thermal performance.

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