Start Date

26-4-1989 4:00 PM

Description

A unique application of an air-to-air heat pipe heat exchanger (HPHX) in a cooling and dehumidification process of an airconditioning system has been developed. It provides significant energy savings in many applications which routinely require reheat of cold supply air for maintaining low humidity within the conditioned space. When a HPHX is placed between cold supply air leaving and room air entering a cooling coil, not only is the cold supply air reheated free, but the room air is also precooled free. The precooling reduces the cooling requirement from the airconditioning system. This concept was studied analytically and experimentally under sponsorship of the NASA Technology Utilization Office (Khattar 1984, 1985). Its energy effectiveness was recently demonstrated in a candy warehouse which required low humidity of 40 percent. The application of a HPHX, along with fine tuning of the air-conditioning system and controls, resulted in significant energy savings. This technology can also be effectively used in many low-humidity applications which are commonly encountered in high-tech and aerospace facilities: This paper discusses the concept of using a HPHX to replace reheat, the results of the field application, and the potential for low-humidity applications such as clean rooms.

Comments

Technology Benefits

Session Chairman: Bill Rock, Manager, Advanced Projects, Technology and Commercialization Office, NASA KSC

Session Organizer: Tina Phillips, Advanced Projects, Technology and Commercialization Office, NASA KSC

Share

COinS
 
Apr 26th, 4:00 PM

Paper Session II-C - Heat Pipes For Low-Humidity Applications

A unique application of an air-to-air heat pipe heat exchanger (HPHX) in a cooling and dehumidification process of an airconditioning system has been developed. It provides significant energy savings in many applications which routinely require reheat of cold supply air for maintaining low humidity within the conditioned space. When a HPHX is placed between cold supply air leaving and room air entering a cooling coil, not only is the cold supply air reheated free, but the room air is also precooled free. The precooling reduces the cooling requirement from the airconditioning system. This concept was studied analytically and experimentally under sponsorship of the NASA Technology Utilization Office (Khattar 1984, 1985). Its energy effectiveness was recently demonstrated in a candy warehouse which required low humidity of 40 percent. The application of a HPHX, along with fine tuning of the air-conditioning system and controls, resulted in significant energy savings. This technology can also be effectively used in many low-humidity applications which are commonly encountered in high-tech and aerospace facilities: This paper discusses the concept of using a HPHX to replace reheat, the results of the field application, and the potential for low-humidity applications such as clean rooms.

 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.