Innovative NH3/CO2 Cascade Refrigeration System
1. Principles Behind the NH3/CO2 Cascade Refrigeration System
The NH3/CO2 cascade refrigeration system elegantly marries two distinct stages: the high temperature stage utilizing NH3 (ammonia) as the refrigerant, and the low temperature stage employing CO2 (carbon dioxide). In this harmonious system, NH3 refrigerant evaporates at high temperatures to condense CO2 gas emitted from the low-temperature stage. The integration is achieved through a condensation evaporator, which simultaneously acts as the condenser for the low-temperature CO2 stage and the evaporator for the high-temperature NH3 stage, seamlessly connecting these two levels.
Heat transfer within this groundbreaking system happens through the end evaporator, where the thermal load is absorbed by CO2 refrigerant. The heat-laden CO2 then transfers this energy to the high-temperature NH3 refrigerant via the condensing evaporator. This energy is subsequently released into the environment through a high-temperature condenser, facilitated by a cooling medium. The condensed CO2 proceeds to the CO2 reservoir, then traverses the dryer filter and throttle valve before entering the CO2 gas-liquid separator. Further propelled by a CO2 circulation pump, it reaches the CO2 evaporator (bypassing any end cooling devices such as single freezers or chillers). Post-evaporation, the bi-phase CO2 returns to the gas-liquid separator, where the gaseous CO2 is compressed by the compressor, resuming its journey to the condensing evaporator. This cyclical process encapsulates the entire cascade refrigeration cycle.
In the NH3/CO2 cascade refrigeration architecture, the high-temperature and low-temperature stages each operate independently, with distinct refrigerants. The high-temperature NH3 system mimics conventional refrigeration setups, comprising components such as the refrigeration compressor, condenser, liquid storage, gas-liquid separator, and throttling device. Conversely, the low-temperature CO2 system features its own specialized components, including the CO2 compressor, condensing evaporator, reservoir, gas-liquid separator, filter dryer, pump, throttling device, evaporator, and expansion vessel.
The CO2 gas-liquid separator plays a pivotal role in isolating CO2 gas droplets from the evaporator within the CO2 compression refrigeration system, preventing compressor wet stroke, stabilizing liquid levels during pump operation, and accommodating liquid return from end equipment and pipelines when the pump ceases operation. When leveraged as a CO2 reservoir during downtime, its volume must suffice to contain the entire system's CO2 liquid. An auxiliary evaporator atop the gas-liquid separator efficiently curbs post-shutdown CO2 pressure surges. Within the NH3/CO2 cascade framework, the condensing evaporator serves dual roles: as NH3 side's evaporator and CO2 side's condenser, facilitating heat absorption through compound liquid evaporation and CO2 gas condensation into liquid within the shell.
2. Key Advantages of the NH3/CO2 Cascade Refrigeration System
(1) Enhanced NH3 Safety Factors:
(1.(1)) The NH3/CO2 cascade system significantly lowers the NH3 condensing pressure, reducing the charge to roughly 1/10th of traditional ammonia refrigeration systems.
(1.(2)) NH3 usage is confined to the machine room or equipment room, akin to a 'tiger in a cage,' securely monitored by skilled personnel.
(1.(3)) Maximizes NH3's excellent heat transfer properties in high-temperature regions to efficiently cool CO2.
(2) Utilizing CO2 as a medium within personnel-dense operational areas (such as single-freezing machines) and warehouses enhances 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 cutting-edge high-tech enterprise that integrates industrial and commercial freezing, cold storage solutions, refrigeration systems, and equipment. Our expertise spans research and development, design, manufacturing, and sales.
Since our inception, we have steadfastly adhered to a philosophy of 'science and technology' as our guiding principle and 'management' as our assurance. Our mission is to meet market demands and provide unparalleled customer service. We are dedicated to offering comprehensive refrigeration system solutions, top-tier products, and exceptional services.
We proudly hold over ten national technology patents and are 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 PLC intelligent program control boxes, among others.
Our specialization lies in program design and equipment customization for a myriad of 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 processes, and thawing devices.
BINGYAN is dedicated to delivering scientifically advanced and meticulously engineered refrigeration system solutions, coupled with top-tier engineering expertise and exceptional after-sales support.
Bingyan offers an all-encompassing suite of services, including sales, design, construction, and after-sales support.
1. Our sales department excels in comprehending customer needs, accurately conveying their intentions, and fostering continuous, effective communication to ensure satisfaction.
2. The design department provides expert and practical engineering advice, crafting reliable and stable refrigeration plans tailored to each customer's specific requirements.
3. Our engineering department approaches every construction task with precision and dedication, meticulously completing each project to achieve superior quality and excellence.
4. The after-sales department remains ever-ready and vigilant, ensuring ongoing success and customer satisfaction.
Question:What sets your company apart?
Answer: Our team of expert designers tailors professional solutions based on your specific needs, selecting the ideal refrigeration equipment to ensure exceptional cooling efficiency, energy conservation, and power savings.
Question:How robust is your company?
Answer: Established in 2011, Qingdao Bingyan Refrigeration Equipment Co., Ltd. boasts a skilled cold storage design team, an adept installation crew, and seasoned after-sales maintenance personnel. We offer comprehensive cold storage design, installation guidance, and maintenance services.
Question:Where are you located? Can I visit your facility?
Answer: Absolutely, you are always welcome to visit our factory at your convenience.
Question:What is the expected delivery time?
Answer: Delivery will be completed within 60 days after your requirements are confirmed.
Question:What payment methods does your company accept?
Answer: Typically, a 30% down payment is required via T/T upon confirming the Proforma Invoice (PI), with the balance payable post-inspection and before shipment. We accept telegraphic transfer and sight letter of credit.
Question: When can I expect a quote?
Answer: We usually provide a quote within 24 hours of receiving your inquiry.
Question: What shipping methods do you offer?
Answer: We offer shipping by sea, air, and express delivery services.
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