Thermoelectric and Thermoacoustic Technologies for Food Refrigeration

Abstract

: Refrigeration has become an important part of the food industry. It is used in all stages of
the chain, from food processing, to distribution, retail and final consumption in the home. The food
industry employs both chilling and freezing processes where the food is cooled from ambient to
temperatures above 0 °C in the former and between −18 °C and −35 °C in the latter to slow the
physical, microbiological and chemical activities that cause deterioration in foods. In these
processes mechanical refrigeration technologies are invariably employed that contribute
significantly to the environmental impacts of the food sector both through direct and indirect
greenhouse gas emissions. To reduce these emissions, research and development worldwide is
aimed at both improving the performance of conventional systems and the development of new
refrigeration technologies of potentially much lower environmental impacts. This paper provides a
brief review of both current state of the art technologies and emerging thermoelectric and
Thermoacoustic refrigeration technologies that have the potential to reduce the environmental
impacts of refrigeration in the food industry.