Heat recovery system solutions in supermarkets are used
mainly to heat up the space air. The practical experience
indicated that though seemingly high quantity of heating
energy is rejected by supermarket refrigeration systems, only
40e70% of the necessary heating energy can be recovered
(Arias, 2005). Arias (2005) explains that in a typical Swedish
supermarket HVAC and refrigeration systems are installed
and operated by separate companies. Therefore, HVAC and
refrigeration systems are coupled by heat exchanger which in
a way separates the entities, i.e. responsibilities, so the control