Heat Pipe Technology for Energy Recovery

ACT-HP Heat Pipe System Basics

Wrap-Around Heat Pipe Heat Exchangers

Heat pipes function by absorbing heat at the evaporator end of the cylinder, boiling and converting the fluid to vapor.  The vapor travels to the condenser end, rejects the heat, and condenses to liquid. The condensed liquid flows back to the evaporator, aided by gravity. This phase change cycle continues as long as there is heat (warm outside air) at the evaporator end of the heat pipe. This process occurs passively (no external electrical energy required).

 

 

 

Application Example

Wrap-Around Heat Pipe Heat ExchangersStep 1. Incoming return or outside 84°F air is pre-cooled to 74°FDB/ 96.8%RH by the pre-cool heat pipe coil.

Step 2. The pre-cooled air flows through the existing AC evaporator cooling coil at 55°FDB / 98%RH. By adding a pre-cool heat pipe coil, the system now functions more efficiently and can perform higher levels of latent cooling and increased dehumidification. Often times a smaller capacity AC system can be chosen due to the increased cooling performance from the pre-cool coil.

Step 3. The air leaving the existing AC evaporator coil is in an over cooled state and requires re-heat. The re-heat heat pipe coil is sized to bring the entering building air to a more comfortable range of 65°FDB / 68.6%RH. ASHRAE standards describe many instances for the requirement of humidity control. Since the building air now has low levels of humidity and more comfort, thermostat temperatures can be set higher, saving even more energy.

The addition of the ACT-HP-WA Wrap-Around System can effectively increase the dehumidification performance of any HVAC system. In addition, there can be thousands of dollars saved on electricity or gas required for reheating the over cooled air.