NH3/CO2 Cascade Refrigeration System
1. NH3/CO2 - The Principle of Cascade Refrigeration System
The NH3/CO2 cascade refrigeration system operates with two distinct stages: high temperature and low temperature. The high temperature stage utilizes NH3 as the refrigerant, while CO2 is used in the low temperature stage. The evaporative cooling of NH3 in the high temperature level condenses the CO2 gas from the low temperature level. A condensation evaporator mediates between the two, functioning as both the condenser for the low temperature level and the evaporator for the high temperature level.
Heat is transferred through the CO2 refrigerant via the end evaporator. This heat is then passed from the CO2 to the high-temperature NH3 refrigerant through the condensing evaporator. The high-temperature NH3 refrigerant dissipates the heat to the environment via a high-temperature condenser and cooling medium. Condensed CO2 in the evaporator moves to the CO2 reservoir, then through a dryer filter and throttle valve into the CO2 gas-liquid separator. The CO2 is pumped to the CO2 evaporator and cycles back, maintaining the cascade refrigeration cycle.
In the NH3/CO2 cascade refrigeration system, the high and low temperature levels operate as separate refrigeration systems, each using a single refrigerant. The high-temperature NH3 system comprises conventional components like 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 CO2 gas-liquid separator effectively separates CO2 gas droplets from the evaporator in the compression refrigeration system to prevent compressor wet stroke and ensure stable liquid levels during pump operation. It also stores returning liquid from equipment and pipelines when the pump is off. When used as a CO2 reservoir, it should hold all system CO2 liquid and include an auxiliary evaporator to manage CO2 pressure after shutdown. In the NH3/CO2 cascade system, the condensing evaporator acts as both the NH3 side evaporator and CO2 side condenser, facilitating heat exchange and CO2 condensation.
2. Advantages of NH3/CO2 Cascade Refrigeration System
(1) Minimized NH3 Safety Risks:
(1.(1)) The NH3/CO2 system significantly lowers NH3 charge condensing pressure to about 1/10th of traditional ammonia systems.
(1.(2)) NH3 is confined to machine rooms and equipment rooms, akin to a 'tiger in a cage,' monitored by experts.
(1.(3)) The system maximizes NH3's excellent heat transfer properties in high-temperature regions to cool CO2.
(2) CO2 can be safely introduced into personnel-dense areas (like single-freezing machines and warehouses), ensuring safety for people and assets.
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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, Qingdao Bingyan Refrigeration Equipment Co., Ltd. is situated in the picturesque coastal city of Qingdao. As a high-tech enterprise, we specialize in the integration of industrial and commercial freezing, cold storage solutions, refrigeration systems, and equipment. Our expertise spans from research and development to design, manufacturing, and sales.
From the beginning, our company has been guided by the principles of 'science and technology' and reinforced by rigorous 'management' practices. Our mission is to meet market demands and deliver exceptional customer service by providing comprehensive refrigeration system solutions, superior products, and unmatched services.
Boasting over ten national technology patents, Qingdao Bingyan is committed to the continuous research and development of high-efficiency, energy-saving, and environmentally-friendly refrigeration systems. Our product offerings include high-efficiency refrigeration units, energy-saving barrel pumps, and PLC intelligent program control boxes, among others.
We excel in the program design and customization of equipment for various projects, including food quick-freezing storage, cold storage for food and pharmaceuticals, ultra-low temperature storage, fruit and vegetable air-conditioning storage, workshop air conditioning, quick-freezing and freeze-drying, and thawing devices.
BINGYAN IS DEDICATED TO DELIVERING SCIENTIFICALLY-INNOVATIVE AND REASONABLY-PRICED REFRIGERATION SYSTEM SOLUTIONS. WE PRIDE OURSELVES IN OFFERING TOP-TIER ENGINEERING AND EXEMPLARY AFTER-SALES SERVICES.
Bingyan offers a holistic suite of services that encompass sales, design, construction, and unparalleled after-sales support.
1. Our sales department excels in precisely understanding and capturing customer needs. They ensure customer intentions are communicated with utmost accuracy, maintaining seamless and uninterrupted communication.
2. The design department provides expert engineering suggestions and crafts tailored, reliable, and stable refrigeration plans that meet the specific needs of each customer.
3. Our engineering department meticulously handles every step of the construction process, striving for perfection to deliver high-quality projects that exceed expectations.
4. The after-sales department stands ready, always on alert, to guarantee customer success and satisfaction.
Question:What distinguishes your company from others?
Answer:Our advantage lies in our professional design team that tailors refrigeration solutions to your specific needs. We meticulously select the optimal equipment, ensuring superior cooling efficiency, energy conservation, and power savings.
Q: How robust is your company?
A: Established in 2011, Qingdao Bingyan Refrigeration Equipment Co., Ltd. boasts a highly skilled cold storage design team, a proficient installation team, and seasoned after-sales maintenance personnel. We offer comprehensive services, including design, installation guidance, and maintenance for complete cold storage solutions.
Q:Where is your company located? Can I visit you?
A: Absolutely! You are warmly welcome to visit our factory at any time.
Q:What is your delivery time?
A: Delivery will be completed within 60 days after your requirements are confirmed.
Q:What payment methods does your company accept?
A: Typically, a 30% down payment is required via Telegraphic Transfer (T/T) upon confirmation of the Proforma Invoice (PI). The remaining balance is due after inspection and prior to shipment. We accept telegraphic transfers and sight letters of credit.
Q: When can I expect a price quote?
A: We generally provide a quote within 24 hours of receiving your inquiry.
Q: What shipping options are available?
A: We offer multiple shipping options, including sea freight, air freight, and express delivery.
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