Low-temperature water chiller (-5°C to -50°C)

Low-Temperature Water-Cooled Unit

Unit Description

A low-temperature water-cooled unit designed for low-temperature conditions, composed of two or more independent refrigeration cycles, with a refrigeration temperature typically ranging from -5°C to -50°C. Due to the diversity of products, some production processes and equipment cannot meet actual working condition requirements using normal-temperature water for cooling. Only low-temperature circulating water can fulfill the requirements of actual production processes, necessitating the use of low-temperature water-cooled units.

Refrigeration Principle

The compressor operates, converting low-temperature, low-pressure gaseous refrigerant into high-temperature, high-pressure gaseous refrigerant, which enters the condenser. Part of the heat from the refrigerant in the condenser is expelled by external cooling water or cooling fans. After releasing heat, the refrigerant liquefies into a high-temperature, high-pressure liquid and flows out. It then passes through a dryer filter for drying and filtration before entering the expansion valve for throttling (a rapid cooling process) and pressure reduction. The refrigerant liquefies into a low-temperature, low-pressure liquid and enters the evaporator for heat exchange. The low-temperature, low-pressure liquid refrigerant absorbs heat from the surrounding medium (water, oil) outside the evaporator. During the heat absorption process, the refrigerant temperature remains constant while its volume changes. After absorbing heat, the low-pressure hydraulic refrigerant vaporizes into a low-temperature, low-pressure gaseous refrigerant and enters the compressor. It is compressed into a high-temperature, high-pressure gas and enters the condenser, thereby completing the entire refrigeration cycle.

Two-Stage Refrigeration Cycle System

The two-stage refrigeration cycle is developed based on the single-stage refrigeration cycle, with the compression process divided into two stages. Refrigerant vapor from the evaporator enters the low-pressure stage cylinder and is compressed to an intermediate pressure. After intermediate cooling, it enters the high-pressure stage cylinder and is compressed to the condensation pressure before entering the condenser. Generally, when the evaporation temperature is between -25°C and -50°C, a two-stage compressor should be used for refrigeration. The refrigeration system consists of an evaporator, two-stage compressor, oil separator, condenser, intermediate cooler, ammonia receiver, ammonia liquid separator, throttle valve, and other auxiliary equipment, all connected by pipes to form a closed system. Among these, the intermediate cooler uses a small amount of liquid refrigerant to vaporize and absorb heat at intermediate pressure, cooling the superheated vapor discharged from the low-pressure stage, reducing the suction temperature of the high-pressure stage, and also cooling the high-pressure liquid refrigerant.

Main Components of the Unit:

Compressor: The core component of the entire refrigeration system and the power source of the refrigerant.

Evaporator: A heat exchange component that relies on the evaporation of liquid refrigerant to absorb heat from the cooled medium.

Condenser: Plays a role in the refrigeration process by dissipating the heat output by the compressor and allowing the refrigerant to condense.

Thermal Expansion Valve: Commonly known as a throttle valve in the refrigeration system.

Liquid Receiver: Installed at the evaporator and compressor suction pipe to prevent liquid refrigerant from entering the compressor and causing liquid hammer, serving as a protective component.

Refrigerant: R22, R404a, R407c, R134a, and R410a are used as refrigerants in the refrigeration system.

To enhance the stability of the water-cooled unit during use, the EU quality management system certification has been actively implemented in the production process. Quality control over product quality is rigorously managed in the selection of suppliers.

Features

1. Compressors are selected from reputable brands, featuring built-in protection, low noise, energy efficiency, and durability.

2. Electrical components use branded products such as "Schneider," "Siemens," and "LG," ensuring stable machine operation and long service life.

3. Imported water pumps from Italy and Taiwan, featuring high flow rates, high efficiency, and durability.

4. Equipped with imported digital temperature controllers, controlling water temperature with an accuracy of ±1°C and a settable temperature range of 5–50°C.

5. Customizable non-standard equipment, controlling water temperature from -50 to 85±0.1°C, water flow from 1 to 1000L±0.03L, and pressure from 0.1 to 10±0.04Mpa.

6. Full stainless steel thick-walled tank evaporator, equipped with automatic water replenishment and other devices, low-water-level automatic protection, and an open design for easy and quick cleaning and maintenance.

7. Eight major protection functions: power phase sequence protection, leakage protection, compressor overload protection, coil overheating protection, high and low pressure protection, water shortage protection, chilled water flow protection, and anti-freeze protection.

8. For industrial water-cooled units, the condenser is a sleeve type with internal threaded copper tubes, designed for optimal heat exchange efficiency. For air-cooled units, the cooling radiator consists of fins and rows of copper tubes, manufactured using secondary flanging fin mechanical expansion tube technology and advanced heat exchanger production lines to ensure product energy efficiency.

9. Electrostatic spray-coated shell, European-style design, aesthetically pleasing and elegant. The outer panel adopts a quick-disassembly form for easy use and maintenance.

Unit Performance

The low-temperature water-cooled unit uses multiple compressors in parallel, each with its own chilled water circuit. All compressors are controlled by a unified microcomputer control system, starting and stopping sequentially. Additionally, Ninewells brand units are entirely made with imported original parts, resulting in extremely low single-unit failure rates. Combined, these factors ensure stable performance and continuous operation over long-term use.

Application Range of Industrial Water-Cooled Units:

Low-temperature water-cooled units are used in hardware processing, casting, chemical industry, electronics, papermaking, printing, leather, jewelry, glass products, aluminum products, vacuum coating, laser processing, cutting, scientific research, medical science, pharmaceuticals, electroplating oxidation, food processing, ultrasonic cleaning, plastic products, central air conditioning, bath temperature control, ice rinks, ink, agriculture, shipbuilding, construction, aquaculture, aerospace manufacturing, automotive manufacturing, and other industries.

After-Sales Service

1. All equipment from our company comes with a one-year warranty and lifelong maintenance. After the warranty period, additional agreements can be signed.

2. Response time: 72 hours for provinces outside the region, 48 hours for provinces within the region.

3. During the warranty period, all repair costs are covered by our company. After the warranty period, all repair costs are borne by the user (at cost).

4. Equipment transportation is via road transport, with dedicated direct delivery or logistics shipping selected based on equipment quantity or size.

Product Quality

If any purchased equipment is found to contain second-hand or counterfeit components after delivery, our company will compensate the user tenfold. If the equipment is found to be undersized or of inferior quality after delivery, our company will unconditionally accept returns or exchanges, with all costs borne by us.

Technical Parameters of the Unit

Water Refrigeration Machine Set Technical Parameters