Applications - Page 2

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

Mar 14,2025 Leave a comment leather industryWaste heat recovery system

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.

[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

Mar 13,2025 Leave a comment fresh air system, 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

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

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.

Wind Generator Air to Air Indirect Cooling System

Mar 3,2025 Leave a comment Air to Air, Wind Generator

Wind power system background

Wind power is a kind of clean energy, with the characteristics of renewable, pollution-free, large energy and broad prospects. The development of clean energy is the strategic choice of all countries in the world.

However, if the air is directly fed into the generator cabin for cooling, the dust and corrosive gas will be brought into the cabin (Especially wind turbines installed offshore).

Indirect cooling system solution

The indirect cooling method can make the air from inside and outside perform indirect heat exchange to achieve the effect of cooling the wind generator cabin without bringing dust and corrosive gases from outside into the cabin.

The main component of the indirect cooling system is the BXB plate heat exchanger. In the BXB plate heat exchanger, two channels are separated by aluminum foil. The air in the cabin is closed circulation, and the outside air is open circulation. The two airs are doing heat exchange. The air in the cabin transfers heat to the outside air, which reduces the temperature in the wind generator. In addition, the air inside and outside the cabin will not be mixed due to the isolation of aluminum foil, which prevents dust and corrosive gases outside the cabin from being brought into the cabin.

Cooling effect analysis

Taking a 2MW unit as an example, the motor's heat generation is 70kW, The circulating air volume in the engine room is 7000m3/h and the temperature is 85℃. The outside circulating air volume is 14000m3/h and the temperature is 40℃. Through the BXB1000-1000 plate heat exchanger, the air temperature in the cabin can be reduced to 47℃ and the heat dissipation capacity can reach 72kW. The relevant parameters are as follows:

Introduction to indirect cooling system

Fresh air system for public places

Mar 3,2025 Leave a comment fresh air system

At present, the utilization rate of air conditioning in public places, more and more people in a closed environment for a long time, because of the lack of the necessary air flow, indoor air quality is very poor, easy cause fatigue unwell and the spread of disease, therefore, measures must be taken for air exchange, using fresh air ventilation with heat recovery unit make the fresh air and exhaust air heat exchange equipment, can be very good to solve this problem.

Current status of air quality in public places:

1. Poor ventilation;

2. Large flow of people, more pollution sources, poor indoor air quality;

Measures:

The introduction of fresh air, "Public Health indicators and Limits requirements" for fresh air volume put forward clear requirements.

Causing problems:

Introduce a large number of fresh air, direct discharge of indoor air, resulting in a large waste of energy;

How to solve:

The fresh air ventilation equipment with heat recovery device makes heat exchange between fresh air and exhaust air, which not only effectively improves indoor air quality, but also solves a large amount of energy waste.

Schematic diagram of heat recovery fresh air ventilation equipment

New air volume recommended table for comfortable air-conditioned rooms

Purify air conditioning fresh air system

Mar 3,2025 Leave a comment Air-conditioning, fresh air system

Medical treatment, biopharmaceutical and high-end electronic intelligence industries have emerged as the country's large-scale industrial strategy, and these industries cannot be separated from the application of purification systems. Because of the particularity of the purification system, the introduction of fresh air and the discharge of some indoor air are realized by power, so the demand for energy is fixed. In the system without new and exhaust energy recovery devices, fresh air will consume a lot of energy, while the energy in exhaust air will be wasted. If the energy in exhaust air can be recovered and the fresh air can be pre-cooled or preheated, the waste of resources can be reduced to the maximum extent. The system mode of strong delivery and strong exhaust is more conducive to the arrangement and utilization of new and exhaust energy recovery.

In the air conditioning system design of major hospitals, treatment centers and animal laboratories, in order to avoid cross pollution, the distance between new fans and exhaust fans is usually relatively far. Our company can provide liquid circulating energy recovery scheme. This energy recovery method can effectively avoid cross-contamination of fresh and exhaust air, effectively recover the cold heat in exhaust air through liquid circulation, and release the recovered energy into fresh air, so as to achieve the purpose of reducing energy consumption of fresh air. This recovery system can drag one or more modes.

In the process purification site, in order to ensure the purification level of the confined space, these areas are relatively independent and closed. In order to maintain the oxygen content of the air in these areas, the supply of fresh air must be increased to a certain proportion. In this case, air-conditioning systems and plate, wheel or heat pipe energy recovery devices can be used.

Indirect Evaporative Cooling Air-conditioning System

Mar 3,2025 Leave a comment Air-conditioning

With the advent of the 5G big data era, network evolution and the rapid development of the data industry, the scale of large data centers(DC) is getting larger and larger, and the power consumption of data centers is also increasing. According to statistics, the national DC electricity consumption in 2018 was 160.889 billion kW/h, surpassing Shanghai's total electricity consumption in 2018, accounting for 2.35% of China's total electricity consumption. Moreover, It is expected to reach 266.792 billion kW/h in 2023, The average annual growth rate will reach 10.64%, which is approximately equal to the power generation capacity of 2.5 Three Gorges.

More importantly, power consumption has become a bottleneck restricting the development of data center services. The following table shows the proportion of energy consumption of each system configuration in the data center. From the analysis of the data in the table, it can be found that in the non-IT energy consumption, about 63% of the loss is caused by the data center cooling system.

In response to the high energy consumption of the data center cooling system, various energy-saving solutions have been tried in the industry. At the result, Indirect Evaporative (IEC) is one of the most promising cooling solutions.

The following figure shows the working principle diagram and product structure diagram of indirect evaporative cooling system.

The indirect evaporative cooling system mainly includes three core components: plate heat exchanger, spray system, and compressor supplementary cooling system. During the cooling process, the air to be treated inside the data center passes through the air heat exchange device. Firstly, the outdoor air is used to cool the closed indoor air. At the same time, the spray system spray water uses the heat of the outdoor air to evaporate in the plate heat exchange device. Absorb heat to reduce the temperature of the air to be processed. As the result, making cool the circulating air inside the DC to the greatest extent. Throughout the process, indoor air is a closed loop system, while outdoor air is an open system. Outdoor air does not allow enter the DC, thus preventing moisture and pollutants in the outdoor air from entering the DC. Since the treated air does not directly contact with water, its moisture content remains unchanged, realizing isohumid cooling of air.

Operating mode

Depending on the outdoor temperature, the Evaporative Cooling Air-conditioning can adopt three operating modes.

Taking a single set of system (selecting BXB2000-2200-12.0 plate heat exchanger) as an example, the selection calculation shows that compared to a pure refrigeration and air-conditioning system, adopting an indirect evaporative cooling system. The air sensible plate heat exchanger can recover 194kw per hour. Spray system can absorb 686kw of heat, and recover a total of 880kw of heat. It can be seen that the use of an indirect evaporative cooling system can save 352kw*h of electricity per hour for the evaporative cooling system, and the energy saving effect is significant.

Case show

Heat pump drying heat recovery energy saving system

Mar 3,2025 Leave a comment Heat pump drying, heat recovery

With the further development of China's economy, the use of green energy will be more and more extensive. Heat pump dehumidification dryers with plate type obvious heat recovery function have developed rapidly in recent years and have been widely used in the Yangtze River basin, southwest China and South China.

The unit using the inverse cano principle at the same time, combined with efficient heat recovery technology, in the whole drying dehumidifying process, through the duct the wet air within the chamber connected to the host using the sensible heat plate heat collector recovery of the sensible heat and latent heat of hot and humid air, thermal recycling, greatly improve the performance of the host, improve the drying speed and material quality. The waste heat can not only improve the performance of the unit, but also reduce the thermal pollution to the environment and alleviate the urban heat island effect.

The heat pump drying heat recovery system is not only used in the mud drying system, but also widely used in many other drying industries. It has the characteristics of good drying quality and high degree of automation, and is the best choice product for energy saving, green and environmental protection in the modern drying industry.

Heat pump dryers with and without heat recovery working principle

When the heat pump dryer dries the air, the air forms a closed cycle between the drying chamber and the equipment. The evaporator's heat absorption function is used to cool and dehumidify the hot and humid air, and the condenser's heat release function is used to heat the dry cold air, so as to achieve the effect of cycle dehumidification and drying.

The main difference between heat recovery function and heat pump dryers without heat recovery function lies in the different air circulation modes. The former is equipped with plate type sensible heat exchanger, which plays the function of pre-cooling and preheating in the air circulation process, reducing the load of compressor operation and achieving the purpose of energy saving.

Heat pump drying heat recovery energy saving system(图1)

Heat pump drying system operation mode

Heat pump drying heat recovery energy saving system(图2)

Energy saving analysis of heat recovery

Taking a heat pump dryer as an example, the air temperature of drying is designed to be 65℃, the relative humidity is 30%, the circulating air temperature is 65℃, the temperature before passing through the evaporator is 65℃, and the temperature after evaporation cooling is 35℃. The condenser needs to heat the air of 35℃ to 65℃ before it can be used.

After matching with BXB500-400-3.5 heat exchanger, 35℃ return air absorbs heat from exhaust air after passing through plate heat exchanger, and the temperature rises to 46.6℃. The condenser only needs to heat the air from 46.6℃ to 65℃ to meet the use requirements, greatly reducing the load of evaporator and condenser, thus reducing the power of the whole machine, achieving the purpose of energy saving.

Energy saving analysis of heat recovery

Heat pump drying heat recovery energy saving system(图3)

Selection and economic calculation

We are very glad to show you the calculation and selection software of plate heat exchanger jointly developed by us and Tsinghua University. If you need, please contact us!

Category Applications

Key Components

Benefits