NH3/CO2 Cascade Refrigeration System
1. NH3/CO2: The Principle of Cascade Refrigeration System
The NH3/CO2 cascade refrigeration system is a sophisticated, dual-stage cooling system that brilliantly integrates two temperature levels: high and low. In this innovative setup, NH3 is utilized as the refrigerant at the high-temperature stage, while CO2 is harnessed at the low-temperature stage. The process begins with the evaporation of NH3 in the high-temperature system, which subsequently condenses the CO2 gas released from the low-temperature system. This interconnection is achieved through a condensation evaporator, serving a dual purpose as both the condenser of the low-temperature stage and the evaporator of the high-temperature stage.
Within this system, the heat load is seamlessly transferred to the CO2 refrigerant via the end evaporator. The absorbed heat is then conveyed to the high-temperature NH3 refrigerant through the condensing evaporator. The NH3 refrigerant releases the heat to the high-temperature condenser, which then dissipates it into the environment through a cooling medium. After condensation, CO2 enters the CO2 reservoir and subsequently passes through a dryer filter and throttle valve into the CO2 gas-liquid separator. The liquid CO2 is distributed to the CO2 evaporator by the CO2 circulation pump, excluding end cooling devices like single freezers or chillers. Post-evaporation, the two-phase CO2 returns to the gas-liquid separator, where the gaseous CO2 is recompressed by the compressor into the condensing evaporator, perpetuating the cycle for continuous refrigeration.
The NH3/CO2 cascade refrigeration system operates with two distinct stages, each employing a single refrigerant. The high-temperature NH3 refrigeration system mirrors conventional refrigeration systems, encompassing components such as the 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 plays a critical role in the CO2 compression refrigeration system by effectively separating CO2 gas droplets from the evaporator. This prevents compressor wet strokes, maintains a stable liquid level during pump operation, and manages liquid return when the pump ceases operation. Should the gas-liquid separator function as a CO2 reservoir when idle, its volume must accommodate all CO2 liquid in the system. Additionally, an auxiliary evaporator installed atop the separator ensures CO2 pressure remains controlled post-shutdown. In the NH3/CO2 cascade system, the condensing evaporator simultaneously acts as the NH3 evaporator and the CO2 condenser, facilitating heat absorption and condensation processes.
2. Advantages of NH3/CO2 Cascade Refrigeration System
(1) Enhanced Safety with NH3:
(1.(1)) The NH3/CO2 cascade refrigeration system significantly lowers the condensing pressure of the NH3 refrigerant charge, reducing it to approximately 1/10 of the traditional ammonia refrigeration system's charge.
(1.(2)) NH3 is confined to the machine and equipment rooms, akin to a 'tiger in a cage,' overseen by skilled technicians.
(1.(3)) This system maximizes NH3's excellent heat transfer properties in high-temperature regions to cool CO2.
(2) CO2, as a safer medium, can be utilized in personnel-dense operational areas (such as single-freezing units) and storage facilities, ensuring 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. Established in 2011 and nestled in the picturesque coastal city of Qingdao, our company stands as a beacon of innovation in the realm of industrial and commercial freezing and cold storage. We specialize in the cutting-edge research, development, design, manufacturing, and sales of advanced refrigeration systems and equipment, making us a distinguished high-tech enterprise.
From the very beginning, Qingdao Bingyan Refrigeration Equipment Co., Ltd. has embraced a philosophy rooted in 'science and technology' as our guiding light, and 'management' as our steadfast guarantee. Our mission? To exceed market demands, deliver unparalleled customer service, and provide flawless refrigeration system solutions, products, and services.
With a portfolio boasting over ten national technology patents, our company is steadfastly dedicated to the 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.
Our expertise extends to the design and customization of equipment for a diverse array of projects. These include food quick-freezing storage, food cold storage, ultra-low temperature cold storage, pharmaceutical storage, fruit and vegetable air-conditioning storage, workshop air conditioning, and advanced solutions such as quick-freezing, freeze-drying, and thawing devices.
BINGYAN IS DEDICATED TO DELIVERING INNOVATIVE, SCIENTIFIC, AND CUSTOMIZED REFRIGERATION SYSTEM SOLUTIONS. WE PRIDE OURSELVES ON OFFERING PREMIUM ENGINEERING SERVICES AND EXCEPTIONAL AFTER-SALES SUPPORT.
Bingyan excels in providing a full spectrum of services, encompassing sales, design, construction, and after-sales support, ensuring a seamless customer experience.
1. Our Sales Department excels at understanding and capturing customer requirements, accurately translating their intentions, and maintaining proactive and clear communication with clients.
2. The Design Department offers expert, tailored engineering advice, crafting reliable and stable refrigeration plans that precisely meet customer needs.
3. Our Engineering Department treats every construction phase with the utmost care and precision, striving for perfection to deliver top-tier projects.
4. The After-sales Department is perpetually on standby, ready to ensure our customers' continued success and satisfaction.
Q:What's your advantage?
A: Leveraging our team of professional designers, we tailor our solutions to your specific needs, selecting the optimal refrigeration equipment. Our goal is to deliver unparalleled cooling efficiency while maximizing energy and cost savings.
Q: How strong is your company?
A: Founded in 2011, Qingdao Bingyan Refrigeration Equipment Co., Ltd. boasts a robust team of cold storage design experts, skilled installation crews, and seasoned after-sales maintenance personnel. We provide comprehensive cold storage solutions, from design and installation guidance to ongoing maintenance services.
Q:Where are you located? Can I visit you?
A: Certainly! We warmly welcome you to visit our factory at your convenience.
Q:How about the delivery time?
A: Delivery will be within 60 days after we confirm your requirements.
Q:What kind of payment does your company support?
A: Typically, a 30% down payment is required via T/T after confirming the Proforma Invoice (PI), with the remaining balance due after inspection and before shipment. We accept both telegraphic transfers and sight letters 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 multiple shipping options, including by sea, by air, and by express courier.
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