Partager

Éjecteur à jet de vapeur utilisé pour produire du froid gratuit par récupération de chaleur pour les systèmes de refroidissement pour les applications militaires.

Vapor jet ejector used to generate free waste heat driven cooling in military environmental cooling units.

Numéro : pap. 2164

Auteurs : ELBEL S., BOWERS C. D., REICHLE M., et al.

Résumé

The waste heat driven vapor jet ejector cooling cycle is a very promising approach to produce ‘free’ cooling by utilizing low-grade energy sources. The mechanism behind ejector-based waste heat cooling is very different from absorption or adsorption cooling technologies that are also aimed at producing heat driven cooling. The ejector cooling system is actually more closely related to vapor compression technology, in which an ejector, a waste heat source, and a liquid pump are used to replace the vapor compressor. Despite the fact that ejectors were first used in refrigeration systems almost 100 years ago, commercially available waste heat driven ejector cooling systems do not exist at this point. However, this intriguing technology continues to draw significant attention from academia, Government laboratories, and research departments in industry. Rising energy costs and the desire to utilize otherwise unused low-grade energy that becomes available as a byproduct in many processes, such as power generation, justify increased research efforts on this promising approach. This paper presents both numerical and experimental research carried out with vapor jet ejector cooling cycles. A military-style, trailer-mounted technology demonstrator was designed, built, and evaluated. The concept consists of a diesel-electric generator with a nominal electric power output of 15 kW. A conventional, transcritical R744 vapor compression environmental control unit (ECU) is powered by the generator, thereby loading the generator’s combustion engine. Waste heat from the generator is extracted at two different temperature levels, namely from the generator’s exhaust and engine coolant streams. The extracted heat is transferred to the R134a working fluid inside the vapor jet ejector ECU where it ultimately produces the desired cooling effect. Measurements show that a cooling effect of 1.54 kW can be produced with electrical input of approximately 0.16 kW. It is demonstrated that the total cooling output per liter fuel spent is improved by up to 11 % by operating the ejector system in addition to the conventional vapor compression system.

Documents disponibles

Format PDF

Pages : 9 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Vapor jet ejector used to generate free waste heat driven cooling in military environmental cooling units.
  • Identifiant de la fiche : 30007148
  • Langues : Anglais
  • Source : 2012 Purdue Conferences. 14th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 16/07/2012

Liens


Voir d'autres communications du même compte rendu (195)
Voir le compte rendu de la conférence

Indexation