NH3/CO2 cascade refrigeration system
1.NH3/CO2, the principle of cascade refrigeration system
NH3/CO2, the cascade refrigeration system is composed of two parts: high temperature stage and low temperature stage, the high temperature stage uses NH3 as the refrigerant, and the low temperature stage uses CO2 as the refrigerant. The evaporation of refrigerant NH3 in the high temperature level system is used to condense the refrigerant gas CO2 discharged from the low temperature level. A condensation evaporator is used to connect the two parts of the high and low temperature levels, which is both the condenser of the low temperature level and the evaporator of the high temperature level.
The heat load is transferred to the CO2 refrigerant through the end evaporator, and the heat absorbed by the CO2 refrigerant is transferred to the high-temperature NH3 refrigerant through the condensing evaporator, and the high-temperature NH3 refrigerant then transfers the heat to the high-temperature condenser and releases it to the environment through the cooling medium. The condensed CO2 in the condensing evaporator enters the CO2 reservoir, and then enters the CO2 gas-liquid separator through the dryer filter and throttle valve. The liquid CO2 is sent to the CO2 evaporator through the CO2 circulation pump (no end cooling device, such as single freezer or chiller, etc.). After the evaporator, the two-phase CO2 returns to the gas-liquid separator, and the gaseous CO2 is sucked by the compressor and compressed into the condensing evaporator. This cycle is repeated to complete the entire cascade refrigeration cycle.
NH3/CO2, in the cascade refrigeration system, the high and low temperature levels are respectively refrigeration systems using a single refrigerant. The equipment composition is also divided into two parts: the high-temperature NH3 refrigeration system is the same as the conventional refrigeration system, in addition to the refrigeration compressor, but also includes the condenser, liquid storage, gas-liquid separator and throttling device; Low temperature CO2 refrigeration system, in addition to CO2 compressor, also includes condensing evaporator, reservoir, gas-liquid separator, filter dryer, pump, throttling device, evaporator and expansion vessel.
The CO2 gas-liquid separator is used to separate the droplets of CO2 gas from the evaporator in the CO2 compression refrigeration system to avoid the wet stroke of the compressor, maintain a stable liquid level when the pump is running, and store the end equipment and pipeline liquid return when the pump stops running. If the gas-liquid separator is used as a reservoir of CO2 when it is not running, its volume should be able to hold all the CO2 liquid in the system. At the same time, the auxiliary evaporator should be set on the top of the gas-liquid separator to effectively prevent the CO2 pressure from being too high after shutdown. In the NH3/CO2 cascade refrigeration system, the condensing evaporator is both the evaporator on the NH3 side and the condenser on the CO2 side, in which the compound liquid evaporates and absorbs heat in the tube, and the carbon dioxide gas is condensed into a liquid in the shell.
2. Advantages of NH3/CO2 cascade refrigeration system.
(1) Reduced NH3 unsafe factors:
(1.(1))NH3/CO2 cascade refrigeration system greatly reduces the condensing pressure of the NH3 refrigeration medium charge, about 1/10 of the traditional ammonia refrigeration system charge;
(1.(2))NH3 is limited to the machine room, equipment room, equivalent to the "tiger" in the "cage ", guarded by professional and technical personnel;
(1.(3))full use of NH3 in the high-temperature region of the good heat transfer properties, used to cool CO2.
(2) CO2 as a medium into the personnel-intensive operation room (such as single-freezing machine) and the warehouse, to ensure the safety of personnel and property.
3) CO2 is applied as a low-temperature grade work medium. Not only can it overcome the shortcomings of its high pressure, but also make full use of the advantages of CO2's high heat transfer efficiency in low-temperature conditions.
| 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 |
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Qingdao Bingyan Refrigeration Equipment Co., Ltd. Was founded in 2011, located in the beautiful coastal city of Qingdao. Is a collection of industrial and commercial freezing and cold storage, refrigeration systems, refrigeration equipment research and development design, manufacturing and sales in one of the high-tech enterprises.
Since its inception, the company has been adhering to the "science and technology" as the guide, to "management" as a guarantee to meet market demand, customer service, to provide customers with perfect refrigeration system solutions, products and services as the goal.
The company now has more than ten national technology patents, perennial commitment to research and development of high-efficiency, energy-saving, environmentally friendly refrigeration system configuration, high-efficiency refrigeration units, energy-saving barrel pumps, PLC intelligent program control box and so on.
Mainly serves the program design and equipment customization 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, thawing device.
BINGYAN IS COMMITTED TO PROVIDING CUSTOMERS WITH SCIENTIFIC AND REASONABLE REFRIGERATION SYSTEM SOLUTIONS, AS WELL AS HIGH-QUALITY ENGINEERING AND AFTER-SALES SERVICES.
Bingyan provides comprehensive services including sales, design, construction and after-sales service
1.The sales department accurately understands and grasps customer needs,accurately conveys customer intentions, andmaintains close communication with customers Cut communication.
2.The design department provides customers with professional and reasonable engineering suggestions, and tailors reliable and stable refrigeration according to customer needs Plan.
3.The engineering department takesevery construction process seriously and meticulously completes every construction task,striving for excellence to createhigh-quality projects
4.The after-sales department is always ready and on standby to ensure the success of customers.
Q:What's your advantage?
A: Through our professional designers according to your needs for your professional design, and select the appropriate refrigeration equipment. Ultimately, we achieve the purpose of high cooling efficiency, energy saving and power saving.
Q:How strong is your company?
A:Our company was established in 2011 and has a professional cold storage design team, installation team, and experienced after-sales maintenance personnel. We can provide a complete set of cold storage design, installation guidance, and after-sales maintenance services.
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A: Sure,welcome to you visit our factory at any time.
Q:How about the delivery time?
A: Within 60 days after we confirm you requirement.
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A:Usually, a 30% down payment is made through T/T after confirming the Proforma Invoice (PI), and the balance will be paid after inspection and before shipment. We accept telegraphic transfer and sight letter of credit.
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