Prozessberechnungen für eine CO2-Anlage zur Kälte- und Wärmeerzeugung für Supermärkte. Teil 2: Begrenzte bzw. keine 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 and it’s 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 reference, the results for ambient temperatures between − 15 °C and + 10 °C are applicable for other supermarket sizes as well.