NH3/CO2 Cascade Refrigeration System
1. NH3/CO2: The Ingenious Principle of Cascade Refrigeration
The NH3/CO2 cascade refrigeration system is a pioneering technology that uniquely combines two stages: a high-temperature stage utilizing NH3 (Ammonia) and a low-temperature stage employing CO2 (Carbon Dioxide) as refrigerants. In this sophisticated system, NH3 acts as the refrigerant in the high-temperature stage, facilitating the condensation of CO2 refrigerant gas emitted from the low-temperature stage. An integrated condensation evaporator bridges these two stages, serving as a dual-purpose component—acting simultaneously as the condenser for the low-temperature level and the evaporator for the high-temperature level.
In this ingenious setup, the heat load collected by the end evaporator is efficiently transferred to the CO2 refrigerant. The heat absorbed by CO2 is then passed on to the high-temperature NH3 refrigerant via the condensing evaporator. Subsequently, the NH3 refrigerant releases this heat to the environment using a cooling medium in the high-temperature condenser. The CO2, now condensed within the evaporator, proceeds to the CO2 reservoir, advancing through the dryer filter and throttle valve to the gas-liquid separator. From there, liquid CO2 is propelled by a circulation pump to the CO2 evaporator (absent any end cooling devices such as a freezer or chiller). Post evaporation, the two-phase CO2 is returned to the gas-liquid separator, where gaseous CO2 is drawn by a compressor and compressed into the condensing evaporator. This seamless process repeats to complete the entire cycle of the cascade refrigeration system.
The NH3/CO2 cascade refrigeration system is divided into two distinct refrigeration systems, each utilizing a single refrigerant. The high-temperature NH3 system mirrors conventional setups, featuring a refrigeration compressor, condenser, liquid storage, gas-liquid separator, and throttling device. Meanwhile, the low-temperature CO2 system includes a CO2 compressor, condensing evaporator, reservoir, gas-liquid separator, filter dryer, pump, throttling device, evaporator, and expansion vessel, collectively working in harmony to maintain optimal cooling performance.
The A CO2 gas-liquid separator plays a crucial role in separating CO2 gas droplets from the evaporator within the CO2 compression refrigeration system. This ensures the prevention of wet strokes in the compressor, maintains a stable liquid level during pump operation, and accommodates end equipment and pipeline liquid return when the pump is inactive. When the system is not operational, this separator also acts as a CO2 reservoir, holding all system CO2 liquid within its capacity. Moreover, an auxiliary evaporator is strategically placed atop the gas-liquid separator to effectively prevent excessive CO2 pressure post-shutdown. In the NH3/CO2 cascade system, the condensing evaporator serves a dual function—as the NH3-side evaporator and CO2-side condenser—where compound liquid evaporates to absorb heat in the tube, simultaneously condensing carbon dioxide gas into liquid within the shell.
2. Advantages of the NH3/CO2 Cascade Refrigeration System
(1) Enhanced Safety by Minimizing NH3 Risks:
(1.(1)) The NH3/CO2 cascade refrigeration system significantly reduces the condensing pressure of NH3 charges, approximately 1/10 compared to traditional ammonia refrigeration systems, effectively enhancing safety.
(1.(2)) NH3 is strategically confined to the machinery and equipment rooms, metaphorically akin to a 'tiger in a cage', safeguarded by experienced professionals and technical experts.
(1.(3)) This system maximizes the superior heat transfer properties of NH3 in high-temperature regions, effectively cooling CO2 for optimized performance.
(2) CO2, as a medium, is safely introduced into personnel-dense operation rooms (such as single-freezing machines) and storage facilities, ensuring the utmost safety for both personnel and property.
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| Compressor type |
Piston, screw |
| Condensor |
enough condenser heat exchanger surface |
| Fan type |
Axial fan:High degree of protection, large Air flow, low noise |
| Unit kinds |
Open type, box type, side discharge type |
| Cooled type |
Air cooled |
| Refrigeration type |
R717;R507;R22;CO2 |
| Copper tube connector |
fitting reducer |
| Place to assemble |
Indoor/out door(concrete construction building/steel
construction building). |
| Voltage |
220V/50HZ, 220V/60HZ, 380V/50HZ etc |
| Controller |
Automatic electric controller, PLC |
| Warranty |
1 Year |
| Case material |
The galvanized sheet is coated with plastic powdered painted |
| Quality Assurance |
2.6Mpa leak-proof stress test |
| Package |
Plywood box and pallet |
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Spanning an impressive area of 60,542 square meters, this project boasts a total construction area of 72,370.31 square meters. It houses state-of-the-art production workshops and an extensive cold storage area covering 65,538.50 square meters, designed to meet the highest industry standards.
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Qingdao Bingyan Refrigeration Equipment Co., Ltd. Established in the picturesque coastal city of Qingdao in 2011, Qingdao Bingyan Refrigeration Equipment Co., Ltd. stands as a beacon of innovation in the realm of industrial and commercial refrigeration. As a high-tech enterprise, we integrate the art and science of cold storage, refrigeration system research, design, manufacturing, and sales into a seamless operation.
From day one, our company has embraced the guiding light of 'science and technology', underpinned by robust 'management' to meet and exceed market demands. Our mission is to offer unparalleled customer service, delivering impeccable refrigeration system solutions, top-tier products, and exceptional services.
With an impressive portfolio of over ten national technology patents, we are dedicated to the relentless pursuit of developing high-efficiency, energy-saving, and environmentally friendly refrigeration configurations. Our innovations include advanced refrigeration units, energy-saving barrel pumps, and cutting-edge PLC intelligent program control boxes.
We specialize in customizing and designing systems for a diverse range of projects. Our expertise spans food quick-freezing storage, food cold storage solutions, ultra-low temperature preservation, pharmaceutical storage, fruit and vegetable air-conditioning storage, and sophisticated systems for workshops, quick-freezing, freeze-drying, and thawing devices.
BINGYAN IS DEDICATED TO DELIVERING SCIENTIFICALLY-BACKED AND METICULOUSLY ENGINEERED REFRIGERATION SYSTEM SOLUTIONS. WE PRIDE OURSELVES ON DELIVERING EXCEPTIONAL QUALITY IN ENGINEERING AND PROVIDING UNPARALLELED AFTER-SALES SUPPORT.
Bingyan offers an all-encompassing suite of services that includes sales consultation, innovative design, precise construction, and reliable after-sales service, ensuring a seamless experience for our clients.
1. Our sales department excels at thoroughly understanding and anticipating customer needs. We ensure clear and precise communication of customer intentions while maintaining open, ongoing dialogue to foster effective collaboration.
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A: Through our professional designers according to your needs for your professional design, and select the appropriate refrigeration equipment. Ultimately, we achieve the purpose of high cooling efficiency, energy saving and power saving.
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