NH3/CO2 Cascade Refrigeration System
1. NH3/CO2 Cascade Refrigeration System Principles
The NH3/CO2 cascade refrigeration system is ingeniously designed with two stages: high-temperature and low-temperature. In this system, NH3 is utilized in the high-temperature stage and CO2 in the low-temperature stage. The NH3 refrigerant evaporates in the high-temperature level system, effectively condensing the CO2 refrigerant gas from the low-temperature level. A condensation evaporator seamlessly connects the two stages, serving a dual purpose as both the condenser for CO2 and the evaporator for NH3.
Heat is transferred to the CO2 refrigerant via the end evaporator. This absorbed heat is then transferred from the CO2 refrigerant to the high-temperature NH3 refrigerant through the condensing evaporator. The NH3 refrigerant subsequently releases the heat to the environment through a high-temperature condenser. The condensed CO2, now liquid, moves to the CO2 reservoir and then to the gas-liquid separator via a dryer filter and throttle valve. The liquid CO2 is circulated to the evaporator by a circulation pump. Post-evaporation, the two-phase CO2 returns to the gas-liquid separator, where the gaseous CO2 is compressed by the compressor and re-enters the condensing evaporator, thus completing the cycle.
In the NH3/CO2 cascade refrigeration system, the high and low-temperature stages are single refrigerant systems. The high-temperature NH3 system includes a refrigeration compressor, condenser, liquid storage, gas-liquid separator, and throttling device. The low-temperature CO2 system comprises a CO2 compressor, condensing evaporator, reservoir, gas-liquid separator, filter dryer, pump, throttling device, evaporator, and expansion vessel.
The The CO2 gas-liquid separator efficiently separates CO2 gas droplets from the evaporator, preventing compressor wet stroke. It maintains a stable liquid level during pump operation and stores the liquid return when the pump is off. When used as a reservoir, it must hold all system CO2 liquid. An auxiliary evaporator atop the separator prevents excessive CO2 pressure post-shutdown. In the NH3/CO2 cascade system, the condensing evaporator acts as both the NH3 evaporator and the CO2 condenser, with the compound liquid evaporating and absorbing heat within the tube, while CO2 gas condenses into liquid in the shell.
2. Advantages of NH3/CO2 Cascade Refrigeration System
(1) Enhanced NH3 Safety Factors:
(1.1) The system drastically reduces NH3 condensing pressure to about 1/10th of traditional ammonia systems.
(1.2) NH3 is confined to machine and equipment rooms, akin to a 'tiger in a cage,' monitored by professional technicians.
(1.3) It leverages NH3's excellent heat transfer properties in the high-temperature region to cool CO2.
(2) CO2 can be safely introduced into personnel-intensive areas (like single-freezing machines and warehouses), ensuring the safety of 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 |
Qingdao Bingyan Refrigeration Equipment Co., Ltd. Established in 2011 in the picturesque coastal city of Qingdao, Qingdao Bingyan Refrigeration Equipment Co., Ltd. stands as a beacon in the realm of industrial and commercial refrigeration. Our expertise spans the entire spectrum of freezing and cold storage solutions, from innovative research and development to cutting-edge design, manufacturing, and sales-all under one roof. We are proud to be recognized as a high-tech enterprise.
From the very beginning, we have championed a philosophy of 'science and technology' as our guiding star and 'management' as our steadfast guarantee. Our mission is to cater to market demands and elevate customer satisfaction by delivering impeccable refrigeration system solutions, products, and services.
Our company boasts over ten national technology patents and is deeply committed to the continuous research and development of high-efficiency, energy-saving, and environmentally friendly refrigeration systems. Our product lineup includes high-efficiency refrigeration units, energy-saving barrel pumps, and state-of-the-art PLC intelligent program control boxes, all designed to set industry benchmarks.
We specialize in the program design and customization of equipment for diverse projects, including food quick-freezing storage, food cold storage, ultra-low temperature cold storage, medicine storage, fruit and vegetable air-conditioning storage, workshop air conditioning, quick-freezing and freeze-drying, and thawing devices. Our solutions are tailored to meet the unique needs of each application, ensuring optimal performance and reliability.
BINGYAN is dedicated to delivering scientifically engineered refrigeration solutions and top-tier engineering and after-sales services, ensuring our customers receive nothing but the best.
At Bingyan, we offer a full spectrum of services including sales, cutting-edge design, meticulous construction, and dedicated after-sales support.
1. Our sales department expertly discerns and captures customer needs, accurately relaying their intentions while maintaining seamless and direct communication.
2. Our design department delivers expert and practical engineering advice, crafting reliable and stable refrigeration plans tailored to meet the specific needs of our customers.
3. Our engineering department meticulously handles each construction process, executing every task with precision and striving for excellence to deliver high-quality projects.
4. Our after-sales department is perpetually prepared, ensuring customer success with unwavering readiness and support.
Question:What sets your company apart from the competition?
Answer:Our highly skilled designers tailor their expertise to your specific needs, selecting the most suitable refrigeration equipment for your requirements. This personalized approach ensures maximum cooling efficiency, energy conservation, and power savings.
Question: How robust is your company?
Answer: Since our establishment in 2011, Qingdao Bingyan Refrigeration Equipment Co., Ltd. has developed a specialized team for cold storage design, installation, and after-sales maintenance. We provide comprehensive services, from initial design and installation guidance to ongoing maintenance.
Question:Where are you located? Can I visit your facility?
Answer: Absolutely, we warmly welcome you to visit our factory anytime.
Question:What is your standard delivery time?
Answer: We typically deliver within 60 days after confirming your requirements.
Question:What payment methods does your company accept?
Answer: We generally require a 30% down payment via T/T upon confirming the Proforma Invoice (PI), with the balance due after inspection and prior to shipment. We accept telegraphic transfer and sight letters of credit.
Question: When can I expect a quotation?
Answer: We usually provide a quotation within 24 hours of receiving your inquiry.
Question: What shipping options do you offer?
Answer: We offer various shipping methods, including sea freight, air freight, and express delivery.
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