NH3/CO2 Cascade Refrigeration System
1. The Principle of NH3/CO2 Cascade Refrigeration System
NH3/CO2, the cascade refrigeration system consists of two distinct stages: high temperature and low temperature. The high temperature stage utilizes NH3 (Ammonia) as the refrigerant, while the low temperature stage employs CO2. In this system, the NH3 evaporates in the high temperature stage to condense the CO2 gas discharged from the low temperature stage. A condensation evaporator serves to link both stages, functioning as both the condenser of the low temperature stage and the evaporator of the high temperature stage.
The heat load is transferred to the CO2 refrigerant through the end evaporator. The heat absorbed by the CO2 refrigerant is then transferred to the high-temperature NH3 refrigerant via the condensing evaporator. This high-temperature NH3 refrigerant subsequently transfers the heat to a high-temperature condenser, releasing it into the environment using a cooling medium. The condensed CO2 in the condensing evaporator flows into the CO2 reservoir and then into the CO2 gas-liquid separator through a dryer filter and throttle valve. Liquid CO2 is circulated to the CO2 evaporator by a CO2 circulation pump. Post-evaporation, the two-phase CO2 returns to the gas-liquid separator, with gaseous CO2 being compressed back into the condensing evaporator by the compressor. This cycle continues, completing the entire cascade refrigeration process.
In the NH3/CO2 cascade refrigeration system, the high and low temperature stages operate as independent refrigeration systems, each using a single refrigerant. The high-temperature NH3 refrigeration system includes familiar components like a refrigeration compressor, condenser, liquid storage, gas-liquid separator, and throttling device. The low-temperature CO2 refrigeration system, on the other hand, includes a CO2 compressor, condensing evaporator, reservoir, gas-liquid separator, filter dryer, pump, throttling device, evaporator, and expansion vessel.
The CO2 gas-liquid separator serves a critical role in separating CO2 gas droplets from the evaporator within the CO2 compression refrigeration system. This prevents compressor wet stroke, maintains a stable liquid level during pump operation, and stores return liquid from end equipment and pipelines when the pump is off. If used as a CO2 reservoir when inactive, the gas-liquid separator must accommodate the entire system's CO2 liquid. An auxiliary evaporator is also mounted atop the gas-liquid separator to prevent excessive CO2 pressure post-shutdown. In the NH3/CO2 cascade refrigeration system, the condensing evaporator doubles as the NH3 side evaporator and the CO2 side condenser, where compound liquid evaporates to absorb heat and carbon dioxide gas condenses into a liquid.
2. Advantages of the NH3/CO2 Cascade Refrigeration System
(1) Reduced NH3 Safety Risks:
(1.(1)) The NH3/CO2 cascade refrigeration system significantly lowers the NH3 condensing pressure, reducing the NH3 charge to roughly 1/10th of that in traditional ammonia systems.
(1.(2)) NH3 is confined to the machine room, effectively caging the 'tiger' under the watch of skilled technicians.
(1.(3)) The system leverages NH3's excellent heat transfer properties in the high-temperature region to cool CO2 efficiently.
(2) CO2 serves as the refrigerant in personnel-intensive areas like single-freezing machines and warehouses, ensuring the safety of both personnel and property.
96cf6d67
| 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 situated in the picturesque coastal city of Qingdao. Qingdao Bingyan Refrigeration Equipment Co., Ltd. is a high-tech enterprise that integrates industrial and commercial freezing and cold storage solutions, refrigeration systems, and equipment research, development, design, manufacturing, and sales.
Since our inception, we have been guided by 'science and technology,' ensuring robust 'management' to meet market demands. Our mission is to deliver impeccable refrigeration system solutions, products, and services to our esteemed clients.
We proudly hold over ten national technology patents and are dedicated to the continuous research and development of high-efficiency, energy-saving, and environmentally friendly refrigeration systems. Our product range includes highly efficient refrigeration units, energy-saving barrel pumps, and PLC intelligent program control boxes.
Our expertise spans program design and equipment customization for various 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.
BINGYAN IS DEDICATED TO DELIVERING SCIENTIFICALLY DESIGNED, REASONABLY ENGINEERED REFRIGERATION SYSTEM SOLUTIONS, ALONG WITH TOP-TIER ENGINEERING AND EXEMPLARY AFTER-SALES SERVICES.
Bingyan offers a full suite of services, encompassing sales, design, construction, and unparalleled after-sales support.
1. Our sales department excels in understanding and capturing customer requirements, seamlessly communicating their intentions, and maintaining robust customer engagement.
2. The design department provides expert and well-considered engineering recommendations, crafting dependable and stable refrigeration solutions tailored to each client's needs.
3. Our engineering department meticulously manages every construction phase, ensuring each task is performed to perfection and delivering high-caliber projects.
4. The after-sales department is perpetually prepared and on standby, committed to ensuring our customers' continued success.
Q:What's your advantage?
A: Our professional designers craft tailored designs to meet your specific needs, selecting the perfect refrigeration equipment to ensure optimal cooling efficiency and significant energy savings.
Q:How strong is your company?
A: Established in 2011, our company boasts a skilled cold storage design team, a proficient installation team, and highly experienced after-sales maintenance personnel. We offer comprehensive services including cold storage design, installation guidance, and dedicated after-sales maintenance.
Q:Where are you? Can I visit you?
A: Absolutely! We warmly invite you to visit our factory at your convenience.
Q:How about the delivery time?
A: Delivery is typically within 60 days after confirming your requirements.
Q:What kind of payment does your company support?
A: Our standard payment terms are a 30% down payment via T/T upon PI confirmation, with the remaining balance payable after inspection and before shipment. We accept telegraphic transfers and sight letters of credit.
Q: When can I get the price?
A: We generally provide quotations within 24 hours of receiving your inquiry.
Q: Which shipping way can you provide?
A: We offer shipping options by sea, air, and express courier.
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