Archive 2025-03-21

  • Home   /  
  • 2025
    • ( Page10 )

The purpose, structure, and type of air-to-air heat exchange core

Leave a comment

An air-to-air heat exchanger core is the central component of an air-to-air heat exchanger system, designed to facilitate the transfer of heat between two separate air streams without mixing them. This technology is widely used in ventilation systems, HVAC (heating, ventilation, and air conditioning) applications, and energy recovery systems. Below, I’ll explain its purpose, structure, types, and benefits.

Purpose of the Air-to-Air Heat Exchanger Core

The primary function of the core is to transfer thermal energy (heat) from one airstream to another, improving energy efficiency and maintaining indoor air quality. For example:

  • In winter, it transfers heat from warm exhaust air (indoor) to cold incoming fresh air (outdoor), preheating the fresh air.
  • In summer, it can cool incoming hot air by transferring heat to the cooler exhaust air. This process reduces the energy required for heating or cooling while ensuring proper ventilation.

Structure of the Core

The core is typically made up of a series of thin plates, channels, or tubes arranged to maximize heat transfer while keeping the two airstreams physically separated. Key features include:

  • Heat Transfer Surface: Made from materials like aluminum, plastic, or specialized polymers with high thermal conductivity.
  • Flow Configuration: The airstreams can flow in counterflow (opposite directions), crossflow (perpendicular directions), or parallel flow (same direction), with counterflow being the most efficient.
  • Sealing: Ensures no mixing of the two airstreams, preventing contamination (e.g., exhaust air mixing with fresh air).

Types of Air-to-Air Heat Exchanger Cores

  1. Plate Heat Exchanger Core:
    • Consists of stacked plates creating alternating channels for the two airstreams.
    • Compact, efficient, and commonly used in residential and commercial HVAC systems.
    • Best for sensible heat transfer (temperature only).
  2. Heat Pipe Core:
    • Uses sealed tubes filled with a refrigerant that evaporates and condenses to transfer heat.
    • Suitable for applications requiring high efficiency over long distances.
  3. Rotary (Enthalpy) Wheel Core:
    • A rotating wheel coated with a desiccant material transfers both heat (sensible energy) and moisture (latent energy).
    • Ideal for humid climates or where humidity control is needed.
  4. Membrane-Based Core:
    • Uses semi-permeable membranes to transfer heat and moisture selectively.
    • Often found in energy recovery ventilators (ERVs).

Benefits

  • Energy Efficiency: Recovers up to 70-90% of the energy from exhaust air, reducing heating/cooling costs.
  • Improved Air Quality: Provides fresh air without sacrificing thermal comfort.
  • Versatility: Available in various sizes and configurations for residential, commercial, or industrial use.
  • Environmental Impact: Lowers energy consumption, supporting sustainable building designs.

Applications

  • Residential: Energy recovery ventilators (ERVs) or heat recovery ventilators (HRVs) for homes.
  • Commercial: Large-scale HVAC systems in offices, malls, or hospitals.
  • Industrial: Process air management in factories or data centers.

In summary, the air-to-air heat exchanger core is a highly efficient and customizable solution for managing air temperature and energy use. Its design and material choices can be tailored to specific needs, making it a vital component in modern ventilation and climate control systems. If you have a specific type or application in mind, feel free to ask for more details!

Application of Plate Heat Exchanger in Industrial Ventilation Field

Leave a comment ,

Plate heat exchangers are mainly used for air heat exchange in the industrial ventilation industry to achieve functions such as air preheating, cooling, or energy recovery in ventilation systems. The following are their solutions and technical principles:

Application of Plate Heat Exchanger in Industrial Ventilation Field
Solution
Air air heat exchange: In some industrial places, such as large factories and workshops, it is necessary to preheat or cool the fresh air in the ventilation system. Plate heat exchangers can exchange heat between the discharged hot or cold air and the incoming fresh air, allowing the fresh air to reach a certain temperature before entering the room, thereby saving energy and improving the comfort of the indoor environment.
Energy recovery: For some industrial processes that generate a large amount of waste heat, such as metallurgy, chemical industry, etc., plate heat exchangers can be used to recover heat energy from exhaust gas and transfer it to fresh air or other media that need to be heated in the ventilation system. For example, high-temperature exhaust gas is heat exchanged with air in the ventilation system through a plate heat exchanger, and the air is heated and used for heating or other process in the workshop.
Technical principles
Structure and heat transfer method: Plate heat exchangers are composed of a series of metal plates with corrugated shapes, forming narrow channels between the plates. Cold and hot fluids flow in adjacent channels. When hot and cold fluids pass through a plate, heat is transferred through the plate. Due to the large surface area and good thermal conductivity of the plate, efficient heat exchange can occur between the hot and cold fluids.

How to choose a suitable heat exchanger in the field of food drying

Leave a comment

How to choose a suitable heat exchanger in the field of food drying

The rotary heat exchanger, with its advanced technical principles and carefully designed solutions, has brought a new and efficient, energy-saving, and high-quality drying experience to the field of food drying, and is becoming the best choice for many food production enterprises to enhance their competitiveness. ​​

Selection design: Based on the specific needs of food drying, such as the type of food to be dried, production scale, drying process requirements, etc., accurately select the appropriate specifications of rotary heat exchangers. For example, for large-scale bread drying production lines, it is necessary to use large rotary heat exchangers with high processing air volume and high heat exchange efficiency; For small nut drying enterprises, small and compact heat exchangers are more suitable. ​
System integration: Cleverly integrate the rotary heat exchanger into the food drying system. Reasonably arrange heat exchangers between the exhaust gas discharge outlet and the fresh air inlet of the drying equipment to ensure that the exhaust gas can flow smoothly through the hot side of the impeller and the fresh air flows through the cold side. At the same time, through an intelligent control system, the speed of the rotary wheel and the flow rates of hot and cold fluids are accurately adjusted to meet the needs of different drying stages, ensuring the stability and efficiency of the drying process.
Energy saving and efficiency improvement: By recovering the heat from exhaust gas, the energy consumption during the drying process can be significantly reduced, reducing the use of fuel or electricity, lowering production costs, while improving drying efficiency and increasing output. ​
Improving quality: Stable drying temperature and humidity control helps ensure even drying of food, avoiding excessive or insufficient drying, enhancing the quality and taste of food, and reducing the rate of defective products. ​
Environmental sustainability: While reducing energy consumption, it also reduces the impact of exhaust emissions on the environment, which is in line with the production concept of green environmental protection. ​

hepa full form in pharma

Leave a comment

In the pharmaceutical industry, HEPA stands for High-Efficiency Particulate Air.

HEPA filters are used in HVAC and AHU systems to remove airborne particles, dust, bacteria, and contaminants, ensuring a clean and sterile environment in pharmaceutical manufacturing, cleanrooms, and laboratories. These filters are essential for compliance with GMP (Good Manufacturing Practice) and ISO cleanroom standards, helping prevent contamination in drug production and research facilities.

ahu full form in medical

Leave a comment

In the medical field, AHU stands for Air Handling Unit.

An AHU is a key component of HVAC (Heating, Ventilation, and Air Conditioning) systems, used in hospitals, laboratories, and healthcare facilities to ensure clean, filtered, and temperature-controlled air. It helps maintain air quality, infection control, and sterile environments, which are essential for operating rooms, ICUs, cleanrooms, and pharmaceutical production areas.

hvac full form in pharma

Leave a comment

In the pharmaceutical industry, HVAC stands for Heating, Ventilation, and Air Conditioning.

The HVAC system is essential for maintaining controlled environmental conditions, including temperature, humidity, air filtration, and pressure differentials, to ensure compliance with Good Manufacturing Practice (GMP) and cleanroom standards. It plays a critical role in preventing contamination, ensuring product stability, and maintaining sterile manufacturing conditions in pharmaceutical production and research facilities.

ahu full form in pharma

Leave a comment

In the pharmaceutical industry, AHU stands for Air Handling Unit.

An AHU is a critical component of the HVAC (Heating, Ventilation, and Air Conditioning) system, designed to regulate and circulate air in pharmaceutical manufacturing areas, cleanrooms, and laboratories. It ensures controlled temperature, humidity, filtration, and air pressure to maintain clean and contamination-free environments, meeting regulatory standards like GMP (Good Manufacturing Practice) and ISO cleanroom classifications.

ahu system in pharmaceutical industry pdf

Leave a comment

https://drive.google.com/file/d/1JmXS_VOQH8o3hjndC7uhes2Zkrk4TTZX/view?usp=sharing

​Air Handling Units (AHUs) are integral components of Heating, Ventilation, and Air Conditioning (HVAC) systems in the pharmaceutical industry. They play a crucial role in maintaining controlled environments essential for the production, testing, and storage of pharmaceutical products. Proper design, operation, and validation of these systems ensure product quality, regulatory compliance, and personnel safety.

Key Aspects of AHU Systems in Pharmaceutical Settings:

  1. Air Filtration: AHUs utilize multi-stage filtration, including High-Efficiency Particulate Air (HEPA) filters, to remove airborne particles, dust, and microorganisms, thereby preventing contamination.
  2. Temperature and Humidity Control: Maintaining precise temperature and humidity levels is vital for product stability and process efficiency. AHUs are equipped with heating and cooling coils, along with humidifiers and dehumidifiers, to achieve these conditions.
  3. Airflow and Pressure Differentials: Controlled airflow patterns and pressure differentials between rooms minimize cross-contamination. Positive pressure is maintained in critical areas to prevent ingress of contaminants.
  4. System Validation: Comprehensive validation protocols, including Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ), are implemented to ensure AHU systems perform as intended.

 

Waste heat recovery system helps the leather industry save energy and reduce consumption

Leave a comment

In the core processes of leather processing, including tanning, soaking, drying, dyeing, and finishing, traditional production techniques rely heavily on high energy consuming equipment such as steam boilers and thermal oil furnaces, resulting in energy waste rates of up to 40% -60%. Direct discharge of waste heat not only leads to low energy utilization efficiency, but also faces the risk of environmental fines.

Waste heat recovery system helps the leather industry save energy and reduce consumption
[Qi Yu] Waste Heat Recovery Solution
Zibo Qiyu has been deeply involved in the research and development of plate heat exchangers for 15 years. Based on the characteristics of leather technology, Qiyu has developed a three-level system of "pre recovery+deep recovery+intelligent management", achieving a waste heat utilization rate of ≥ 90% and reducing gas consumption by 40% -60%. working principle:
Using stainless steel plate heat exchangers, the waste heat (50-80 ℃) from tanning tanks and immersion tanks is recovered and used to preheat fresh water or chemical raw materials (such as tannin extract and dyes), thereby reducing steam consumption by 25% -35%. The reaction efficiency of preheated raw materials is increased by 20%, and the tanning cycle is shortened by 12%. Introducing waste heat pump technology to boost low-grade waste heat (30-50 ℃) to above 80 ℃ for constant temperature use in the dyeing workshop; Equipped with a digital management platform, real-time optimization of production line energy consumption models.
Our advantages:
We have jointly developed with the Department of Thermal Engineering at Tsinghua University and hold 12 patents for waste heat recovery;
Member unit of China Energy Conservation Association and Vice President unit of Shandong Energy Conservation and Environmental Protection Industry Association.
We will use plate heat exchangers to lock in every minute of heat energy, making green production within reach!
Please feel free to contact me at any time.

fresh air system for painting with heat recovery

Leave a comment ,
fresh air system for painting with heat recovery

A fresh air system with heat recovery for painting applications is essential for maintaining air quality, temperature control, and energy efficiency in painting booths or industrial painting areas. These systems typically integrate:

Key Components

  1. Heat Recovery Ventilator (HRV) or Energy Recovery Ventilator (ERV) – Recovers heat (or cool energy) from exhaust air to pre-condition incoming fresh air.
  2. Filtration System – Removes contaminants, dust, and paint particles to ensure clean incoming air.
  3. Supply and Exhaust Fans – Maintain balanced airflow to create a controlled environment.
  4. Temperature and Humidity Control – Ensures proper drying and curing conditions for paint.
  5. Pressure Control System – Maintains positive or negative pressure to manage overspray and fumes.
fresh air system for painting with heat recovery

fresh air system for painting with heat recovery

Benefits

✅ Energy Savings – Reduces heating/cooling costs by reusing heat from exhaust air.
✅ Improved Air Quality – Removes harmful VOCs and airborne particles.
✅ Better Paint Finish – Stable airflow minimizes defects like dust contamination.
✅ Compliance with Regulations – Meets environmental and workplace safety standards.

Need Help?