An evaporator is an indispensable core component in refrigeration, air conditioning, and heat pump systems. Its primary function is to absorb heat from the surrounding environment (such as air or liquid), causing the refrigerant to evaporate into a gas under low pressure, thereby achieving continuous cooling or freezing. As the key to efficient heat exchange, the performance of an evaporator directly impacts the overall system's energy efficiency, stability, and operating costs. With nearly three decades of deep R&D and manufacturing experience focused on the refrigeration field, Zhejiang Kaidi Refrigeration Equipment Co., Ltd. provides technologically advanced, highly reliable, and application-adaptable evaporator products and customized solutions.
I. Working Principle: The Core Process of Heat Energy Conversion
The evaporator operates on the principle of phase-change heat transfer. High-pressure liquid refrigerant, after passing through an expansion device (like an expansion valve), becomes a low-pressure, low-temperature mixture of liquid and gas and enters the evaporator tubes. Inside the evaporator, the refrigerant absorbs heat from the medium flowing outside the tubes (the coolant or air), completely evaporating into a low-pressure vapor, thus cooling the medium. This process is the sole stage in the refrigeration cycle that produces cooling capacity.
II. Main Types and Application Comparison
Kaidi offers multiple series of evaporators based on different heat transfer media, structures, and operating modes to meet various complex requirements ranging from commercial refrigeration and industrial freezing to process cooling.
| Type |
Working Principle / Structure |
Core Features & Advantages |
Typical Application Scenarios |
Kaidi Product Highlights |
| Air Cooling Type |
Refrigerant evaporates inside tubes; air is blown over the external fins/tubes and cooled. |
Flexible installation, directly cools air, widely used. |
Cold storage, refrigerated display cases, air handling units. |
Utilizes high-efficiency internally grooved tubes and hydrophilic aluminum fins, improving heat exchange efficiency by ~15%; fans and motors from reputable brands ensure smooth, low-noise operation. |
| Liquid Cooling Type |
Refrigerant evaporates in the shell or tube side, cooling the coolant (water, glycol solution, etc.) flowing in the tube or shell side. |
High heat exchange efficiency, precise temperature control, facilitates long-distance cooling distribution. |
Chillers, process cooling, central air conditioning. |
Shell-and-tube design offers high pressure resistance and long life; optional anti-corrosion coatings adapt to complex water qualities; all units undergo rigorous factory testing at 2.5 times design pressure. |
| Flooded / Immersion Type |
Evaporator coils are directly immersed in the liquid tank requiring cooling. |
Compact structure, direct heat exchange, no pump required for circulation. |
Beer brewing, chemical reactors, low-temperature storage tanks. |
Coils can be customized to tank shape; materials like stainless steel or copper tubes are available to ensure compatibility and safety with process media. |
III. Application Fields & Kaidi Solutions
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Food Cold Chain: In large logistics cold storage facilities, Kaidi's high-efficiency air coolers (air cooling evaporators), combined with precise defrost control technology, ensure uniform and stable storage temperatures, significantly reducing weight loss of meat, fruits, and vegetables, and safeguarding food safety and quality.
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Industrial Refrigeration: In chemical or pharmaceutical industries, Kaidi's titanium or stainless steel shell-and-tube evaporators (liquid cooling type) offer corrosion resistance and high-pressure tolerance, providing stable and reliable low-temperature coolant for reaction processes, which is crucial for continuous production.
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Commercial Air Conditioning: The evaporators within Kaidi's air-cooled screw chillers, known for their high efficiency and large cooling capacity, provide chilled water for comfortable air conditioning in shopping malls and hotels. Their optimized flow path design effectively reduces unit operating energy consumption.
As a technology-integrated company encompassing R&D, manufacturing, and service, Kaidi not only supplies standard products but also offers customized evaporator design and production based on your specific project needs (such as special temperatures, space constraints, medium characteristics). This is carried out in our modern factory located in Shengzhou, Zhejiang, providing one-stop service from program design to after-sales support.
IV. Professional Maintenance Guidance
Proper maintenance significantly extends evaporator service life and maintains high-efficiency operation. Kaidi's professional after-sales service team recommends:
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Regular Cleaning: For air-cooled evaporators, clean the fins regularly to prevent dust and oil fouling from affecting heat transfer. For liquid-cooled types, clean the water-side piping periodically based on water quality.
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Check Frosting and Defrosting: Pay attention to frost buildup on evaporators operating in low-temperature environments. Ensure the defrost system (electric, hot water, or hot gas defrost) functions correctly to prevent excessive frost from degrading performance.
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Monitoring and Recording: Regularly check refrigerant-side pressure and temperature. Comparing this data with historical records can help identify potential issues like refrigerant leaks or internal blockages early.
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Professional Servicing: Annual systematic inspection by Kaidi or authorized service providers is recommended, including checking fastener status, lubricating fan bearings, and performing leak detection.
V. Frequently Asked Questions (FAQ)
Q1: How do I choose the right type of evaporator for my project?
A: The choice depends on what is being cooled (air or liquid), target temperature, spatial layout, and energy efficiency requirements. The complimentary program design service provided by Kaidi during the initial project phase will comprehensively evaluate these factors to recommend the most optimized and economical evaporator model and configuration.
Q2: What are the energy-saving advantages of Kaidi evaporators?
A: Our evaporators are designed for high efficiency from the ground up, utilizing Computational Fluid Dynamics (CFD)-optimized fin and tube row designs, high-efficiency internally grooved heat transfer tubes, and low-energy-consumption fan motors. Verified in our high-standard testing laboratory, their energy efficiency ratios consistently outperform industry averages.
Q3: Can your evaporators be used in corrosive environments or for special processes?
A: Yes. For special environments like seafood processing plants (high-salinity air) or chemical plants, we can provide customized anti-corrosion solutions such as epoxy-coated fins, stainless steel, or titanium alloy tubes to ensure long-term durability of the equipment.
Q4: How often does an evaporator need maintenance? Is maintenance costly?
A: Routine cleaning can be done every 1-3 months depending on the operating environment. Professional in-depth maintenance is recommended annually. Regular preventive maintenance avoids production interruptions from unexpected failures, and its cost is far lower than the long-term operational waste caused by equipment damage repairs or low efficiency. Kaidi's extensive service network across China and overseas provides timely and cost-effective maintenance support.
Q5: Can you accommodate very limited installation space?
A: This is one of Kaidi's specialties. Our R&D center in Shanghai Hongqiao and our strong technical team are experts in custom-designing compact or specially shaped evaporators based on customer site space constraints, maximizing space utilization without compromising performance.
02 Nov,2026
