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Coaxial Tube Heat Exchanger

Coaxial heat exchangers, also known as "tube heat exchangers ", are composed of spirally grooved inner tubes and outer tubes, and hot and cold fluids flow in the annular gap of the inner tubes and outer tubes respectively. Different thread patterns are designed and printed inside the concentric casing, which is used to increase the heat exchange contact area and transfer different fluids, so as to achieve efficient heat transfer. Coaxial tube heat exchanger is a kind of high efficiency, compact, widely used, easy to maintain and so on.

Structural
Working
Material
Products
Industry
Case
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Structural Characteristics

Structural Feature - 1

After the refrigerant cools and condenses, the liquid film on the rib structure of the spiral groove tube becomes thinner due to surface tension, reducing thermal resistance.

Structural Feature - 2

The spiral groove structure enhances heat transfer from both sides. The fluid inside the tube flows both axially and in a spiral motion, creating localized secondary flows. This intensifies the mixing between the fluid near the wall and the central fluid, increasing turbulence intensity and heat transfer coefficient.

Characteristics Of Coaxial Heat Exchanger

Few Welds, High Pressure Resistance

Due to the minimal welding connections in the manufacturing process of spiral tube heat exchangers, the process is straightforward, and the weld quality is high. This significantly reduces the risk of leakage caused by interface cracking due to long-term exposure to vibration, pressure fluctuations, and thermal cycling.

High Heat Exchange Efficiency

The spiral groove structure enhances heat transfer from both sides. The fluid inside the tube flows both axially and spirally, intensifying the mixing between the fluid near the wall and the central fluid, increasing turbulence intensity and heat transfer coefficient.

Enhanced Heat Transfer

a. The mesh-tooth structure on the outer wall of the inner tube increases the contact area between the fluid and the tube wall; b. The mesh-tooth structure on the outer wall of the inner tube also increases fluid turbulence intensity, raising the Reynolds number; this structure effectively reduces the boundary layer thickness of the fluid. These factors improve the heat exchanger's heat transfer coefficient, enhance heat transfer efficiency, and increase the heat transfer rate per unit volume.

Good Freeze Resistance

Even at low flow rates, water can form turbulent flow within the spiral groove tube, making it less prone to freezing. The unique spiral groove structure is flexible and will not crack due to freezing.

Self-Descaling, Less Prone to Clogging

The fluid's spiral flow provides a self-descaling capability, ensuring stable performance with minimal degradation. The water-side flow channel has a large cross-sectional area, allowing larger diameter debris such as sand and fibers to pass through, reducing the likelihood of clogging. The multi-start spiral structure of the heat exchange tubes ensures that the fluid remains in a turbulent state, enhancing self-descaling and anti-scaling abilities, maintaining a high level of cleanliness within the channel.

Working Principle

Working Principle & Structural Features - 1

After the refrigerant cools and condenses, the liquid film on the ribbed structure of the spiral grooved tube becomes thinner due to surface tension, reducing the thermal resistance to heat transfer.

Working Principle & Structural Features - 2

The spiral groove structure enhances heat transfer on both sides. The fluid inside the tube flows both axially and spirally, generating localized secondary flows, which intensify the mixing between the fluid near the wall and the central fluid, thereby increasing turbulence intensity and the heat transfer coefficient.

Working Principle & Structural Features - 3

Increases the contact area between the fluid and the tube wall; enhances fluid turbulence intensity, effectively reducing the boundary layer thickness; increases the core of fluid phase change heat transfer; effectively improves heat transfer efficiency and increases the heat transfer rate per unit volume.

Material Structure

Inner Tube Material

The inner tube material can be: copper, nickel white copper (BFe10-1-1), titanium, stainless steel, and there are both smooth and embossed high/low efficiency tubes. Additionally, there is also a copper-copper double-wall inner tube structure.

Outer Tube Material

Depending on the usage environment, the outer tube material can be: steel, copper, nickel white copper (BFe10-1-1), titanium, stainless steel, etc.

X-ray Image of Coaxial Heat Exchanger

Heat Pump Water Heater
HZSS coaxial heat exchanger for heating heat pumps is primarily designed for heating and cooling water units, making it particularly suitable for the "coal-to-electricity" market. It offers high heating efficiency while also accommodating cooling.
Heat Pump Heating Unit
The primary function of a coaxial heat exchanger in a heat pump system is to transfer heat, enabling energy exchange between the refrigerant and water or air to achieve heating or cooling.
Commercial Air Conditioner (Heat Pump)
The primary function of a coaxial heat exchanger in a heat pump system is to transfer heat, enabling energy exchange between the refrigerant and water or air to achieve heating or cooling.
Water (Ground) Source Heat Pump
HZSS water (ground) source coaxial heat exchanger is specially designed for water and ground source heat pumps, functioning as either an evaporator or condenser. It offers multiple shape options, high efficiency, and a compact structure.
Industrial Chiller (Oil Cooler)
The coaxial heat exchanger plays a crucial role in industrial chillers (oil coolers). Its unique design makes it an ideal choice for many industrial cooling applications, offering advantages such as high heat transfer efficiency, space-saving, anti-fouling properties, durability, easy maintenance, and reliability.
Supercritical CO₂ Heat Pump
HZSS supercritical CO₂ heat exchanger is suitable for CO₂ heat pumps or CO₂ refrigeration (freezing) units. It is specially designed according to the physical and heat transfer characteristics of transcritical CO₂, featuring high pressure resistance and extremely high heat transfer efficiency.
Brine Solution Air Conditioner
In a brine solution air conditioning system, the coaxial heat exchanger's compact design effectively saves space. The direct contact of the two-layer tubes results in higher heat transfer efficiency, making it especially suitable for situations requiring rapid heat exchange.
Swimming Pool Heat Pump
Made from high-efficiency internally threaded tubes bent into an Ω shape and a plastic shell, this efficient heat exchanger ingeniously combines the features of shell-and-tube and plate heat exchangers.
Seawater Aquaculture Thermostat
Made from high-efficiency internally threaded tubes bent into an Ω shape and a shell with baffles, this efficient heat exchanger ingeniously combines the features of shell-and-tube and plate heat exchangers.
Fluid Ice Slurry System
The crystals in fluid ice slurry are extremely small, smooth, and rounded, allowing them to reach every corner of the product being cooled. This enables the fastest heat transfer, cooling the product evenly and immediately, while preventing the formation of potentially harmful bacteria, enzyme reactions, and discoloration. Fluid ice slurry helps maintain peak product freshness for a longer period.
Refrigeration System
In refrigeration systems, this is a high-efficiency, energy-saving heat exchange device primarily used to cool or freeze the medium to maintain the freshness of food during storage or transportation.
Economizer
In the refrigeration cycle of screw or centrifugal compressors, the economizer is used to further cool the refrigerant flowing from the evaporator (i.e., subcooling) to enhance the overall system efficiency.
Ice Maker
An ice maker is a refrigeration machine that cools water through the evaporator using a refrigerant to produce ice. It uses a refrigeration system, with water as the carrier, to create ice when powered on and passed through specific equipment.
Water Purifier
Shenshi water purifier coaxial heat exchangers use food-grade stainless steel for both the inner and outer tubes, providing safe and reliable ice water or hot water for water purifier users through refrigeration or heat pump systems.
Cold (Hot) Beverage Machine
Cold (Hot) Beverage Machine
Dishwasher
A dishwasher is a device that automatically cleans tableware such as bowls, chopsticks, plates, and utensils. Currently, fully automatic dishwashers on the market can be divided into household and commercial types. Household dishwashers are suitable for family use, and mainly include cabinet, countertop, and integrated sink types.
Washing Machine
Shenshi washing machine coaxial heat exchangers can be used in washing machines. We currently offer standardized products and can also customize products based on customer requirements.

Industry

HVAC

The HVAC system is designed to provide comfortable indoor air quality and temperature while effectively managing energy consumption.

Refrigeration

The goal of using heat exchangers is to ensure temperature control, energy efficiency, and product quality, helping to keep food, pharmaceuticals, and other temperature-sensitive items at the right temperature to extend their shelf life and ensure safety.

Home Food

The key role of heat exchangers in home appliances and industry lies in enhancing energy efficiency, reducing costs, and promoting sustainability by enabling precise thermal control to improve equipment performance and production efficiency.

Swimming Pool Heat Pump

The key role of heat exchangers in swimming pool heat pumps is to increase water temperature and optimize energy efficiency, ensuring the pool operates under more comfortable conditions.

Shipping

Effectively regulating the temperature of ship systems improves the performance of engines and equipment while ensuring that fuel and other fluids are transported within the appropriate temperature range, promoting the safety and efficiency of the vessel.

Energy

By transferring heat efficiently, heat exchangers optimize temperature control in energy systems, improving the performance of power generation equipment and energy utilization efficiency.

Case

Midea Residential Heating Unit

The Midea residential heating unit provides dual first-level energy efficiency for cooling in summer and heating in winter, saving users approximately 10%-15% on electricity consumption. The high-efficiency heat exchange capability of HZSS Technology's coaxial heat exchanger plays a crucial role in this. The unit operates stably in ambient temperatures ranging from -26°C to 48°C, providing a comfortable indoor environment for users.

TCL Dual First-Level Inverter Spray Enthalpy Heating Unit

HZSS Technology coaxial sleeve heat exchanger is applied in the TCL dual first-level inverter spray enthalpy heating unit, significantly enhancing the reliability and energy efficiency of the unit. The dual first-level energy efficiency for both cooling and heating has reached IPLV(H) = 3.44, IPLV(C) = 4.42, truly achieving energy savings. This model operates stably even in extremely low temperatures as low as -35°C, showcasing the heat exchanger's excellent anti-freeze performance.

Gree Fire Phoenix Residential Cooling and Heating Unit

The exceptional performance of HZSS Technology heating heat pump coaxial heat exchanger powers the Gree Fire Phoenix residential cooling and heating unit. This unit can stably heat in ultra-low temperatures as low as -35°C, providing 60°C high-temperature heating water to meet the heating needs of underfloor heating, fan coil units, and radiators. For cooling, it operates stably in a wide ambient temperature range of 10-48°C, providing 7-22°C medium to low-temperature cooling water to meet the cooling needs of fan coil units and ceiling radiant panels.

Service

We have a team of experts who understand your industry. Whenever and wherever you purchase our equipment, we can provide professional technical support.HZSS portfolio of energy saving services covers the entire life cycle of equipment, including equipment installation, maintenance, improvement, etc., to achieve maximum uptime and optimal performance of equipment.