NH3/CO2 Cascade Refrigeration System
1. NH3/CO2: The Principle of Cascade Refrigeration System
The NH3/CO2 cascade refrigeration system is ingeniously engineered with two distinct stages: high temperature and low temperature. The high-temperature stage utilizes NH3 as the refrigerant, while the low-temperature stage leverages CO2. During operation, the evaporative cooling of NH3 in the high-temperature stage condenses the CO2 gas expelled from the low-temperature stage. A specialized condensation evaporator seamlessly bridges these two stages, functioning simultaneously as the low-temperature condenser and the high-temperature evaporator.
Heat management within the system is efficiently handled by transferring the heat load to the CO2 refrigerant through the end evaporator. The absorbed heat by CO2 is then conveyed to the NH3 refrigerant via the condensing evaporator. Subsequently, this high-temperature NH3 refrigerant releases the heat to the external environment through a high-temperature condenser with a cooling medium. Post-condensation, CO2 is directed to a reservoir and subsequently to a gas-liquid separator via a dryer filter and throttle valve. The liquid CO2 is propelled to the CO2 evaporator using a circulation pump, and after evaporative cooling, the CO2 returns in a two-phase state to the gas-liquid separator. The gaseous CO2 is then compressed back into the condensing evaporator, repeating the cycle for a sustained refrigeration process.
In the NH3/CO2 cascade refrigeration system, the distinct high and low temperature levels are each dedicated to a single refrigerant system. The high-temperature NH3 system mirrors conventional setups with a refrigeration compressor, condenser, liquid storage, gas-liquid separator, and throttle device. Conversely, the low-temperature CO2 system includes a CO2 compressor, condensing evaporator, reservoir, gas-liquid separator, filter dryer, pump, throttle device, evaporator, and expansion vessel.
The CO2 gas-liquid separator is pivotal for removing CO2 gas droplets from the evaporator, thereby preventing compressor wet strokes. It stabilizes liquid levels during pump operation and retains liquid in the system when the pump halts. Additionally, its design allows it to function as a CO2 reservoir, capable of holding the entire system's CO2 liquid volume. An auxiliary evaporator atop the gas-liquid separator mitigates excessive CO2 pressure upon shutdown. Within the NH3/CO2 cascade system, the condensing evaporator dual-functions as the NH3 side evaporator and the CO2 side condenser, facilitating efficient heat absorption and condensation.
2. Advantages of NH3/CO2 Cascade Refrigeration System
(1) Enhanced Safety by Reducing NH3 Risks:
(1.(1)) The NH3/CO2 cascade system significantly lowers the NH3 refrigerant charge pressure to about 1/10th of that in traditional ammonia systems.
(1.(2)) NH3 is confined to controlled environments like machine rooms and equipment rooms, akin to a 'tiger in a cage,' monitored by skilled personnel.
(1.(3)) Optimal use of NH3's superior heat transfer properties in the high-temperature zone to cool CO2.
(2) CO2 as a refrigerant ensures safety within personnel-intensive areas (e.g., single-freezing machines and warehouses), safeguarding both staff and assets.
51397e0f
| 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. Established in 2011, Qingdao Bingyan Refrigeration Equipment Co., Ltd. is nestled in the picturesque coastal city of Qingdao. We specialize in the comprehensive integration of industrial and commercial freezing and cold storage solutions, including the research, development, design, manufacturing, and sales of advanced refrigeration systems and equipment. As a high-tech enterprise, we are committed to delivering cutting-edge solutions.
From our inception, we have steadfastly adhered to a philosophy guided by science and technology, supported by robust management practices. Our mission is to meet market demands by providing impeccable customer service and delivering comprehensive refrigeration system solutions, products, and services that exceed expectations.
Holding over ten national technology patents, we are dedicated to the perpetual research and development of high-efficiency, energy-saving, and environmentally friendly refrigeration systems. Our innovations include high-efficiency refrigeration units, energy-saving barrel pumps, and PLC intelligent program control boxes, underscoring our commitment to technological excellence.
We excel in the program design and equipment customization for a diverse array 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. Our tailored solutions are designed to meet the specific needs of each industry.
BINGYAN is dedicated to delivering customers scientifically-backed, carefully crafted refrigeration system solutions, complemented with top-tier engineering and exceptional after-sales services.
Bingyan offers an all-encompassing suite of services including sales, design, construction, and after-sales support to ensure a seamless experience.
1. Our sales department expertly understands and captures customer needs, accurately conveys their intentions, and maintains robust and continuous communication to ensure full transparency and satisfaction.
2. The design department provides insightful and professional engineering advice, tailoring reliable and stable refrigeration plans that align perfectly with the specific needs of each customer.
3. The engineering department meticulously handles every construction process with precision and dedication, striving for perfection to deliver high-quality, exemplary projects.
4. Our after-sales department stands ready at all times, prepared to ensure customer success and satisfaction with prompt and efficient support.
Q:What's your advantage?
A:Our professional designers tailor solutions to your needs, selecting the most suitable refrigeration equipment. This ensures high cooling efficiency, energy savings, and power conservation.
Q: How strong is your company?
A: Established in 2011, our company boasts a specialized cold storage design team, experienced installation crew, and proficient after-sales maintenance personnel. We deliver comprehensive services from design and installation guidance to after-sales maintenance.
Q:Where are you? Can I visit you?
A: Absolutely, you're welcome to visit our factory at any time.
Q:How about the delivery time?
A: Delivery is within 60 days after we confirm your requirements.
Q:What kind of payment does your company support?
A: Typically, a 30% down payment is made through T/T after confirming the Proforma Invoice (PI), with the remaining balance paid after inspection and before shipment. We accept telegraphic transfers and sight letters of credit.
Q: When can I get the price?
A: We usually quote within 24 hours after receiving your inquiry.
Q: Which shipping methods can you provide?
A: We offer shipping by sea, air, and express services.
){kind=link}