COMBINED CASCADE REFRIGERATION AIR-CONDITIONING SYSTEM AND CONTROL METHOD THEREFOR

摘要

A combined cascade refrigeration air-conditioning system and the control method therefor, characterized in that a cold-source system of the cascade air-conditioner is comprised of two or more outdoor combined refrigeration modules (1) arranged on the outdoor side of the cascade air-conditioning system. The outdoor combined refrigeration module (1) is comprised of a vapour-compressing refrigeration circulation circuit for a first refrigerant and a circulation circuit for a second refrigerant. One or more indoor air-cooler modules (3) are provided on the indoor side. A storage and transport unit (2) for the second refrigerant is connected between the outdoor combined refrigeration module (1) and the indoor air-cooler module (3) via a liquid collecting pipe (4), a liquid supply main pipe (5) and an air returning main pipe (6) so as to constitute a closed circulation system. The air-conditioning system configures the number of indoor and outdoor modules based on the designed thermal load of the object to be air-conditioned, regulates the refrigerating capacity precisely, and meets the thermal control requirements of all kinds of data rooms and electronic apparatuses; the system can make full use of the positive indoor-outdoor temperature difference in winter and transition seasons to discharge heat at a low cost, thereby achieving the energy-saving of the air conditioning system.