System for simultaneous production of heat and cold for storage of temperature sensitive food product in e.g. supermarket, has re-cooler and control valve arranged between cooler and collector to control pressure in carbon dioxide circuit

摘要

The system (1) has an evaporator stage comprising parallel evaporators in which liquid carbon dioxide expands to gas phase by extracting heat from environment. Compressor stages (4a-4c) compress and heat the gaseous carbon dioxide. An external cooler (7) emits the heated carbon dioxide to the atmosphere. A downstream collector (10) decompresses and condenses the carbon dioxide. A re-cooler (8) e.g. heat exchanger, and a control valve (9) are arranged between the outdoor cooler and the collector for controlling pressure in a carbon dioxide circuit.