NH3/CO2 Cascade Refrigeration System
1. NH3/CO2: The Principles of Cascade Refrigeration System
The NH3/CO2 cascade refrigeration system ingeniously integrates two stages: high temperature and low temperature. The high-temperature stage utilizes NH3 as the refrigerant, while the low-temperature stage employs CO2. Within this system, the evaporation of NH3 in the high-temperature stage is harnessed to condense the CO2 refrigerant from the low-temperature stage. A condensation evaporator effectively links these two stages, serving as the low-temperature condenser and high-temperature evaporator.
Heat load is efficiently transferred to the CO2 refrigerant via the end evaporator. The absorbed heat by CO2 is then relayed to the high-temperature NH3 refrigerant through the condensing evaporator. The NH3 refrigerant subsequently transfers this heat to the high-temperature condenser, releasing it into the environment through a cooling medium. Condensed CO2 enters a reservoir, and passes through a dryer filter and throttle valve into the CO2 gas-liquid separator. Liquid CO2 is circulated to the CO2 evaporator by a CO2 pump. Post-evaporation, the two-phase CO2 returns to the separator, where gaseous CO2 is compressed back into the condensing evaporator by the compressor, completing the cascade refrigeration cycle.
In the NH3/CO2 cascade refrigeration system, the high and low-temperature stages operate as independent refrigeration systems using single refrigerants. The high-temperature NH3 system mirrors conventional systems, comprising a refrigeration compressor, condenser, liquid storage, gas-liquid separator, and throttling device. The low-temperature CO2 system includes a CO2 compressor, condensing evaporator, reservoir, gas-liquid separator, filter dryer, pump, throttling device, evaporator, and expansion vessel.
The The CO2 gas-liquid separator plays a vital role in isolating CO2 gas droplets from the evaporator in the CO2 compression refrigeration system. This prevents compressor wet strokes, maintains a stable liquid level during pump operation, and stores end equipment and pipeline liquid return when the pump stops. If used as a CO2 reservoir when idle, its volume should accommodate all system CO2 liquid. An auxiliary evaporator on top of the separator helps prevent excessive CO2 pressure post-shutdown. In the NH3/CO2 cascade setup, the condensing evaporator functions as both the NH3 side evaporator and CO2 side condenser, facilitating heat absorption and CO2 condensation.
2. Advantages of NH3/CO2 Cascade Refrigeration System
(1) Enhanced Safety with Reduced NH3 Risks:
(1.(1)) The NH3/CO2 cascade system significantly lowers the NH3 refrigerant charge pressure, reducing it to about 1/10th of traditional systems;
(1.(2)) NH3 is confined to the machine room, monitored by skilled technicians, akin to a 'tiger in a cage';
(1.(3)) It leverages NH3's superior heat transfer properties in high-temperature regions to cool CO2.
(2) CO2 is safely utilized in personnel-dense areas like single-freezing machines and warehouses, ensuring 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 |
Qingdao Bingyan Refrigeration Equipment Co., Ltd. Founded in 2011 and nestled in the picturesque coastal city of Qingdao, Qingdao Bingyan Refrigeration Equipment Co., Ltd. is a premier high-tech enterprise specializing in industrial and commercial freezing, cold storage, and advanced refrigeration systems. Our expertise spans across research and development, design, manufacturing, and sales of state-of-the-art refrigeration equipment.
Since our inception, we have steadfastly adhered to a philosophy driven by 'science and technology'. Guided by rigorous management principles and a commitment to excellence, we strive to meet market demands and provide unparalleled customer service. Our ultimate goal is to deliver comprehensive refrigeration system solutions, exceptional products, and outstanding services to our valued clients.
Our innovative edge is backed by over ten national technology patents. We are dedicated 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 PLC intelligent program control boxes, among others.
We specialize in the program design and equipment customization for a diverse range of projects, including food quick-freezing storage, cold storage for food and medicine, ultra-low temperature cold storage, fruit and vegetable air-conditioning storage, workshop air conditioning, quick-freezing and freeze-drying, and thawing devices.
BINGYAN IS DEDICATED TO DELIVERING CUSTOMERS SCIENTIFICALLY-ENGINEERED AND OPTIMALLY DESIGNED REFRIGERATION SYSTEM SOLUTIONS, ALONG WITH TOP-TIER ENGINEERING AND COMPREHENSIVE AFTER-SALES SERVICES.
Bingyan offers a full suite of services encompassing sales, design, construction, and after-sales support, ensuring a seamless customer experience from start to finish.
1. Our sales department excels in understanding and capturing customer requirements, ensuring precise communication of customer intentions, and maintaining close, effective communication with our clients throughout the process.
2. The design department delivers expert and practical engineering suggestions, crafting reliable and stable refrigeration plans tailored to meet the exact needs of each customer.
3. Our engineering department approaches each construction process with meticulous attention to detail, aiming for nothing less than excellence in every task to create high-quality projects.
4. The after-sales department stands ready and vigilant at all times, dedicated to ensuring the continued success and satisfaction of our customers.
Question:What sets your company apart as a preferred choice?
Answer:Our distinct advantage lies in our team of professional designers who tailor refrigeration solutions to your specific needs. We meticulously select the most suitable refrigeration equipment, ensuring high cooling efficiency, energy conservation, and significant power savings.
Q: How robust is your company in terms of capability and experience?
A: Since our establishment in 2011, Qingdao Bingyan Refrigeration Equipment Co., Ltd. has developed a highly skilled cold storage design team, a proficient installation team, and seasoned after-sales maintenance experts. We offer comprehensive services including design, installation guidance, and maintenance of cold storage systems.
Question:Where is your company located, and can I arrange a visit?
A: Absolutely, you are welcome to visit our factory at your convenience.
Question:What is your typical delivery time frame?
A: Our standard delivery time is within 60 days after the confirmation of your requirements.
Question:What payment methods does your company accept?
A: Typically, we require a 30% down payment via T/T upon confirmation of the Proforma Invoice (PI), with the remaining balance due after inspection and prior to shipment. We accept telegraphic transfers and sight letters of credit.
Question: When can I expect to receive a price quote?
A: We usually provide a price quote within 24 hours of receiving your inquiry.
Question: What shipping options are available?
A: We offer various shipping methods, including sea freight, air freight, and express delivery.
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