NH3/CO2 Cascade Refrigeration System
1. NH3/CO2: The Principle of Cascade Refrigeration Systems
The NH3/CO2 cascade refrigeration system comprises two distinct stages: a high temperature stage using NH3 as the refrigerant and a low temperature stage using CO2. In this sophisticated setup, the evaporation of NH3 in the high-temperature stage is employed to condense the CO2 gas discharged from the low temperature stage. A condensation evaporator ingeniously connects these two stages, functioning as both the condenser for the low temperature stage and the evaporator for the high temperature stage.
Heat load is efficiently transferred to the CO2 refrigerant via the end evaporator. The absorbed heat is then channeled to the high-temperature NH3 refrigerant through the condensing evaporator. Subsequently, the NH3 refrigerant releases the heat to the environment via a high-temperature condenser and cooling medium. The condensed CO2 from the condensing evaporator flows into the CO2 reservoir and then through a dryer filter and throttle valve into the CO2 gas-liquid separator. Liquid CO2 is powered to the CO2 evaporator by a circulation pump. Post-evaporation, two-phase CO2 returns to the gas-liquid separator, where gaseous CO2 is compressed by a compressor into the condensing evaporator. This continuous cycle ensures a seamless cascade refrigeration process.
In the NH3/CO2 cascade refrigeration system, both high and low temperature stages utilize single refrigerants. The equipment is categorized into two parts: the high-temperature NH3 refrigeration system, which includes a refrigeration compressor, condenser, liquid storage, gas-liquid separator, and a throttling device, resembles conventional systems. On the other hand, the low-temperature CO2 refrigeration system incorporates a CO2 compressor, condensing evaporator, reservoir, gas-liquid separator, filter dryer, pump, throttling device, evaporator, and expansion vessel.
TheCO2gas-liquid separator efficiently segregates CO2 gas droplets from the evaporator in the CO2 compression refrigeration system, preventing compressor wet stroke. It maintains liquid level stability during pump operation and stores liquid return from end equipment when the pump halts. When used as a CO2 reservoir during non-operation, its volume should accommodate all system CO2 liquid. An auxiliary evaporator on the gas-liquid separator's top is crucial to avert excessive CO2 pressure post-shutdown. In NH3/CO2 cascade systems, the condensing evaporator serves dual roles: the NH3 side's evaporator and the CO2 side's condenser, effectively managing heat absorption and condensation.
2. Advantages of NH3/CO2 Cascade Refrigeration Systems
(1) Reduced NH3 Unsafe Factors:
(1.(1)) The NH3/CO2 cascade refrigeration system significantly lowers the condensing pressure of the NH3 refrigerant charge, reducing it to about one-tenth of that in traditional ammonia systems;
(1.(2)) NH3 is confined to machine and equipment rooms, akin to a 'tiger in a cage,' supervised by skilled technicians;
(1.(3)) Maximizes NH3's excellent heat transfer properties in high-temperature regions, effectively cooling CO2.
(2) CO2, being a safer medium, can be utilized in personnel-intensive areas such as single-freezers and warehouses, safeguarding 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, our company is nestled in the picturesque coastal city of Qingdao. We specialize in industrial and commercial freezing and cold storage, offering comprehensive solutions in refrigeration systems. We are a high-tech enterprise that integrates research and development, design, manufacturing, and sales.
From the very beginning, we have been guided by the principles of science and technology, ensuring that our management practices guarantee the highest standards. Our mission is to meet market demands and serve our customers with impeccable refrigeration system solutions, outstanding products, and unparalleled services.
With over ten national technology patents, we are dedicated to the continuous research and development of high-efficiency, energy-saving, and environmentally responsible refrigeration systems. Our innovative products include high-efficiency refrigeration units, energy-saving barrel pumps, and PLC intelligent program control boxes, among others.
We excel in program design and equipment customization for a range of projects, including food quick-freezing storage, food cold storage, ultra-low temperature cold storage, pharmaceutical storage, fruit and vegetable air-conditioned storage, workshop air conditioning, quick-freezing and freeze-drying, and thawing devices.
Bingyan is passionately dedicated to delivering customers with meticulously crafted and scientifically sound refrigeration system solutions. We pride ourselves on offering top-tier engineering support and exceptional after-sales services.
Bingyan offers a comprehensive suite of services encompassing sales, design, construction, and unparalleled after-sales support.
1. Our sales department excels in deeply understanding and anticipating customer needs. We ensure precise communication of customer intentions and maintain close, seamless communication with our clients.
2. Our design department provides expert and practical engineering recommendations, crafting reliable and stable refrigeration plans tailored to meet the unique needs of each customer.
3. The engineering department approaches every construction task with utmost seriousness and precision. We meticulously complete each process, striving for excellence to deliver high-quality projects.
4. Our after-sales department is perpetually prepared and on standby, committed to ensuring our customers' continued success and satisfaction.
Question:What sets your company apart?
Answer: Our professional designers will tailor a design specifically for your needs and select the most suitable refrigeration equipment. This ensures high cooling efficiency, energy conservation, and significant power savings.
Q: How robust is your company?
A: Established in 2011, our company boasts a specialized team for cold storage design, installation, and experienced after-sales maintenance. We offer comprehensive services from design and installation guidance to after-sales support.
Q:Where is your company located? Can I visit your facilities?
A: Absolutely! We warmly welcome you to visit our factory at any time.
Q:What is your delivery timeline?
A: Delivery is within 60 days after we confirm your requirements.
Q:What types of payment do you accept?
A: Generally, a 30% down payment is required via T/T after the Proforma Invoice (PI) is confirmed. The remaining balance is due after inspection and before shipment. We accept telegraphic transfer and sight letter of credit.
Q: When can I expect to receive a price quote?
A: We typically provide a quote within 24 hours of receiving your inquiry.
Q: What shipping options are available?
A: We offer shipping by sea, air, and express courier services.
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