NH3/CO2 Cascade Refrigeration System
1. NH3/CO2: The Principle of Cascade Refrigeration System
NH3/CO2: The cascade refrigeration system comprises two stages: a high-temperature stage and a low-temperature stage. The high-temperature stage uses NH3 as the refrigerant, while the low-temperature stage utilizes CO2. The NH3 refrigerant evaporates at the high temperature level to condense the CO2 gas from the low temperature level. A condensation evaporator connects these stages, serving as both the condenser for the low-temperature stage and the evaporator for the high-temperature stage.
The heat load transfers to the CO2 refrigerant via the end evaporator. The CO2 refrigerant absorbs this heat and transfers it to the high-temperature NH3 refrigerant through the condensing evaporator. The high-temperature NH3 refrigerant then dissipates this heat to the environment via a high-temperature condenser and cooling medium. The condensed CO2 from the condensing evaporator moves into the CO2 reservoir, then into the CO2 gas-liquid separator through a dryer filter and throttle valve. A CO2 circulation pump sends the liquid CO2 to the CO2 evaporator, which then returns as two-phase CO2 to the gas-liquid separator. The gaseous CO2 is compressed by the compressor into the condensing evaporator, repeating the cycle to complete the refrigeration process.
NH3/CO2: In this cascade refrigeration system, high and low temperature levels operate as individual refrigeration systems with single refrigerants. The high-temperature NH3 system mirrors a conventional refrigeration setup, including a refrigeration compressor, condenser, liquid storage, gas-liquid separator, and throttling device. Conversely, the low-temperature CO2 system includes a CO2 compressor, condensing evaporator, reservoir, gas-liquid separator, filter dryer, pump, throttling device, evaporator, and expansion vessel.
TheCO2 gas-liquid separator ensures the separation of CO2 gas droplets from the evaporator in the CO2 compression refrigeration system, preventing compressor wet strokes. It maintains a stable liquid level during pump operation and stores the equipment and pipeline liquid return when the pump stops. As a reservoir, it should accommodate all CO2 liquid in the system. An auxiliary evaporator atop the gas-liquid separator prevents excessive CO2 pressure after shutdown. In the NH3/CO2 cascade system, the condensing evaporator functions as both the evaporator on the NH3 side and the condenser on the CO2 side, where the compound liquid evaporates and absorbs heat, condensing the CO2 gas into a liquid.
2. Advantages of the NH3/CO2 Cascade Refrigeration System
(1) Enhanced Safety with NH3 Reduction:
(1.(1)) The NH3/CO2 cascade system significantly lowers the NH3 refrigeration medium charge by approximately 1/10 compared to traditional ammonia systems, reducing condensing pressure.
(1.(2)) NH3 is confined to the machine room, akin to a 'tiger in a cage', monitored by professional technicians.
(1.(3)) Maximizing NH3's superior heat transfer properties in high-temperature regions to cool CO2.
(2) Utilizing CO2 as a medium in personnel-intensive areas like single-freezing machines and warehouses ensures the safety of 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 pioneering high-tech enterprise specializing in the research, development, design, manufacturing, and sales of industrial and commercial freezing, cold storage, and advanced refrigeration systems and equipment.
From its inception, the company has steadfastly adhered to guiding principles rooted in science and technology, ensuring top-notch management practices to meet market demands and deliver exceptional customer service. Our mission is to provide flawless refrigeration system solutions, products, and services tailored to customer needs.
Boasting over ten national technology patents, our company is dedicated to the perennial research and development of high-efficiency, energy-saving, and environmentally friendly refrigeration systems. Our product range includes advanced refrigeration units, energy-saving barrel pumps, and PLC intelligent program control boxes.
We excel in designing programs and customizing equipment for a multitude of projects, such as 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 offering customers scientifically sound and intelligently engineered refrigeration system solutions, complemented by top-tier engineering and exceptional after-sales services.
Bingyan provides an all-encompassing suite of services including sales, design, construction, and after-sales support, ensuring every aspect of your refrigeration needs is impeccably covered.
1. Our sales department expertly understands and precisely captures customer needs, ensuring seamless communication and accurately conveying customer intentions for an impeccable service experience.
2. The design department offers professional, well-considered engineering advice and crafts reliable, stable refrigeration plans uniquely tailored to meet customer requirements.
3. The engineering department approaches each construction phase with meticulous attention to detail, aiming for nothing short of excellence in every project to deliver superior quality outcomes.
4. Our dedicated after-sales department is perpetually prepared and on standby, committed to ensuring the ongoing success and satisfaction of our valued customers.
Q:What's your advantage?
A: Our strength lies in our tailored design solutions, crafted by professional designers to meet your specific requirements. We carefully select the most suitable refrigeration equipment to ensure high cooling efficiency, energy savings, and significant power reductions.
Q:How strong is your company?
A: Established in 2011, Qingdao Bingyan Refrigeration Equipment Co., Ltd. boasts a highly skilled team specializing in cold storage design, installation, and after-sales maintenance. We offer comprehensive services, including tailored design, installation guidance, and reliable maintenance support.
Q:Where are you? Can I visit you?
A: Absolutely! We warmly welcome you to visit our factory at your convenience.
Q:How about the delivery time?
A: We ensure delivery within 60 days after confirming your requirements.
Q:What kind of payment does your company support?
A: Typically, we require a 30% down payment via T/T upon confirming the Proforma Invoice (PI), with the remaining balance due after inspection and before shipment. We accept telegraphic transfer and sight letter of credit.
Q: When can I get the price?
A: We usually provide a quote within 24 hours of receiving your inquiry.
Q: Which shipping methods can you provide?
A: We offer versatile shipping options, including sea freight, air freight, and express delivery.
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