NH3/CO2 Cascade Refrigeration System
1. NH3/CO2: The Ingenious Principle of the Cascade Refrigeration System
The NH3/CO2 cascade refrigeration system is meticulously engineered with two distinct stages: the high-temperature stage utilizing NH3 and the low-temperature stage employing CO2 as refrigerants. In this innovative setup, the evaporative process of NH3 in the high-temperature stage is purposefully harnessed to condense the CO2 gas vented from the low-temperature stage. Acting as a crucial bridge between these two stages, the condensation evaporator serves the dual purpose of being both the condenser for the CO2 and the evaporator for the NH3, ensuring efficient thermal exchange within the system.
The heat load is expertly transferred to the CO2 refrigerant via the terminal evaporator, from where the absorbed heat is carried to the high-temperature NH3 refrigerant through the condensing evaporator. This NH3 refrigerant then efficiently transfers the gathered heat to the high-temperature condenser, releasing it into the environment with the aid of a cooling medium. In this seamless process, the CO2, once condensed, is collected in the CO2 reservoir, subsequently progressing through the CO2 gas-liquid separator after passing through a dryer filter and a throttle valve. The liquid CO2 is then meticulously circulated through the CO2 evaporator using a circulation pump, completing a cycle by returning to the gas-liquid separator, while the gaseous CO2 is drawn by the compressor and recompressed, perpetuating the cycle.
NH3/CO2: Within this cascade refrigeration system, separate high and low temperature levels are seamlessly managed by individual refrigerant systems. The high-temperature NH3 refrigeration system mirrors a traditional system, comprising a refrigeration compressor, along with a condenser, liquid storage, gas-liquid separator, and throttling device. Meanwhile, the low-temperature CO2 refrigeration system is equipped with a CO2 compressor, condensing evaporator, reservoir, gas-liquid separator, filter dryer, pump, throttling device, evaporator, and expansion vessel, ensuring robust and efficient cooling performance.
The CO2 gas-liquid separator plays an essential role in the CO2 compression refrigeration system by efficiently separating droplets from the evaporator to prevent compressor wet stroke, maintain a stable liquid level during pump operation, and store returning liquids when the pump halts. When used as a CO2 reservoir during inactivity, its capacity must accommodate the entire system's CO2 liquid volume. Additionally, to prevent excessive CO2 pressure post-shutdown, an auxiliary evaporator is strategically placed atop the separator. In the NH3/CO2 cascade system, the condensing evaporator uniquely operates as the NH3-side evaporator and CO2-side condenser, where compound liquid evaporates and absorbs heat inside the tube, while CO2 gas undergoes condensation in the shell.
2. Advantages of the NH3/CO2 Cascade Refrigeration System
(1) Reduced NH3 Risk Factors:
(1.(1)) The NH3/CO2 cascade refrigeration system significantly diminishes the NH3 refrigerant charge's condensing pressure, slashing it to a mere one-tenth of the traditional ammonia system, enhancing safety.
(1.(2)) NH3 containment is strategically limited to machine and equipment rooms, akin to keeping a 'tiger in a cage,' vigilantly guarded by experienced technical personnel.
(1.(3)) This system maximizes NH3's excellent heat transfer properties in the high-temperature region, effectively utilizing it to cool CO2.
(2) With CO2 as the medium, this system safely incorporates it into personnel-centric operational areas and warehouses, ensuring comprehensive 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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This expansive project spans an impressive 60,542 square meters, with a total construction area reaching 72,370.31 square meters. It boasts a state-of-the-art production workshop along with a vast cold storage area encompassing 65,538.50 square meters, ensuring efficient and safe cold storage operations.
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Since our establishment, we have steadfastly embraced 'science and technology' as our guiding light, and 'management' as our unwavering foundation. Our mission is to fulfill market demands and provide unparalleled customer service. We strive to deliver impeccable refrigeration system solutions, innovative products, and premium services to our esteemed clientele.
With a portfolio boasting over ten national technology patents, we are tirelessly dedicated to the research and development of high-efficiency, energy-saving, and environmentally friendly refrigeration system configurations. Our offerings include superior refrigeration units, energy-efficient barrel pumps, and advanced PLC intelligent program control boxes, among others.
Our expertise lies in the program design and equipment customization for an array of projects such as food quick-freezing storage, comprehensive food cold storage solutions, ultra-low temperature facilities, pharmaceutical storage, fruit and vegetable air-conditioning storage, as well as workshop air conditioning, quick-freezing, freeze-drying, and innovative thawing devices.
BINGYAN prides itself on delivering scientifically advanced and meticulously crafted refrigeration system solutions. Our unwavering commitment extends to offering top-tier engineering and unparalleled after-sales support, ensuring complete customer satisfaction.
Bingyan is a one-stop destination, providing an all-encompassing suite of services that include sales, design, construction, and comprehensive after-sales support, ensuring a seamless customer experience.
1. Our sales department excels in precisely understanding and addressing customer needs, ensuring that every intention is effectively communicated. We maintain proactive and robust communication with our valued customers to enhance mutual understanding.
2. The design department stands out by offering expert engineering advice and crafting bespoke, reliable, and stable refrigeration solutions that are perfectly aligned with customer requirements.
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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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A:Our company was established in 2011 and has a professional cold storage design team, installation team, and experienced after-sales maintenance personnel. We can provide a complete set of cold storage design, installation guidance, and after-sales maintenance services.
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