Prozessberechnungen für eine CO2-Anlage zur Kälte- und Wärmeerzeugung für Supermärkte. Teil 1: Weitestgehende CO2-Abkühlung durch Umgebungsluft

摘要

CO2 processes are used in supermarkets for medium- and low-temperature refrigeration and by now even for room heating and hot tap-water preparation via heat recovery. Through systematic thermodynamic process calculations, the limits of the heat recovery from a CO2 plant and its influence on the refrigeration process as well as the complete system are investigated for a supermarket with 100 kW medium-temperature refrigeration capacity. This investigation focuses on the energy efficiency of the heat supply by the extended CO2 plant. By using the medium-temperature refrigeration capacity as a reference, the results for ambient temperatures between − 15 °C and + 10 °C are applicable for other supermarket sizes as well.