Project Background and Challenges

In Jinjiang, Fujian Province, known as the "Shoe Capital of China", the footwear and apparel industry, as its core economic pillar, has nurtured numerous large-scale and modern shoe-making enterprises. The client of this service is a large-scale shoe factory in the local area, which has a complete production process line from raw materials to finished products, including cutting, sewing, bonding and assembly, forming, quality inspection and packaging, and other full process links.

Jinjiang, Fujian Province, is located on the southeast coast and has a subtropical maritime monsoon climate. The summer is long and humid, with an average temperature of 30-35 ℃ and a relative humidity of over 75% throughout the year, making it unbearable to feel hot and stuffy. For labor-intensive footwear industry, the high temperature and high humidity working environment not only affects the comfort and production efficiency of workers, but also poses challenges to product quality (such as bonding strength) and employee stability.

The factory area is an old-fashioned standard factory building with a multi story reinforced concrete structure, which has a relatively old building age and average overall sealing. The workshop has a spacious area, with each floor about 5 meters high. Although there are glass windows for natural lighting, the natural ventilation effect is limited. The key areas that need improvement this time are concentrated in the cutting workshop, needle assembly line workshop, bonding assembly workshop, and quality inspection packaging workshop. These areas are not only densely populated, but also emit a certain amount of harmful gases during bonding and other processes. Traditional ventilation methods are no longer able to meet the increasingly stringent workshop environmental requirements.

Ruifeng Plan: Tailored to local conditions and scientifically combined

Faced with the actual pain points of customers - the large area, poor sealing, high floor height, and complex usage functions of the old factory building, the design team of Ruifeng Environmental Protection Refrigeration went deep into the site and comprehensively considered multiple factors such as geographical climate characteristics, building structure status, production process requirements, personnel density distribution, and customer budget costs. Finally, they abandoned the single thinking of traditional industrial air conditioning and adopted a comprehensive ventilation and cooling solution of "multiple equipment combinations and precise zoning management".

1. Personnel intensive area: Long distance air supply to create a "fresh air comfort zone"

For areas such as the needle car assembly line workshop and the quality inspection packaging workshop where personnel are highly concentrated and equipment layout is compact, we have selected high-power evaporative air coolers. By utilizing the high evaporation efficiency principle of relatively dry air in Fujian region (or through humidity pretreatment), clean cold air that has been cooled and humidified is accurately delivered to each worker's work site through long-distance air ducts and multi outlet fixed-point air supply.

Considering that although the workshop area is large, there are numerous ground equipment and limited available space, we innovatively adopted an external wall hanging installation, which not only does not occupy valuable production line ground area, but also ensures the uniformity of air supply. At the same time, in order to quickly dissipate the heat generated by machine operation and human body heat dissipation, we have matched a negative pressure fan with sufficient air exchange rate (designed to be 60-80 times per hour) to form a stable convective negative pressure on the other side of the workshop, forcing hot air, dust, and odors to be quickly discharged outdoors, ensuring a continuous supply of fresh air.

2. Special process area: Strong exhaust and water curtain cooling to overcome "odor and high temperature"

In the cutting and bonding assembly workshops, although the personnel density is relatively low, the main contradiction in the production process is the gas emitted by the adhesive. For this, we adopted the classic combination of water curtain wall and negative pressure fan.

The physical principle is that a negative pressure fan forcefully draws air from one side of the workshop, forming a negative pressure zone that forces the air at the water curtain wall on the other side of the workshop to pass through the moist honeycomb wet curtain at high speed. When water evaporates on the surface of the wet curtain, it absorbs a large amount of heat from the air (evaporation heat absorption principle), thereby converting outdoor hot air into cool and humid cold air and sending it into the workshop. This process not only achieves significant cooling (usually up to 4-10 ℃), but also efficiently replaces and discharges harmful gases generated during the bonding process through strong airflow organization, ensuring the air quality and operational safety of the workshop.

Why not choose air conditioning? - Ruifeng's professional considerations and cost-effectiveness analysis

At first, the factory considered installing industrial air conditioners with dehumidification function. After in-depth analysis, the Ruifeng team provided more reasonable suggestions:

Physical structure mismatch: The old factory building has a huge area and poor sealing. Installing air conditioning means that the cold air will quickly dissipate, resulting in equipment running at full capacity but ineffective, causing huge energy waste.

Cost accounting cannot be accurately calculated: In the current competitive environment of low profit and high cost in the domestic footwear industry, the high equipment procurement cost of industrial air conditioning and the sky high electricity and maintenance fees in the later stage will seriously erode the profits of enterprises. In contrast, the combination scheme of evaporative air cooler and negative pressure fan has an initial investment cost of only 1/3 to 1/5 of the air conditioner, and the operating energy consumption is as low as 1/5.

Balance between effectiveness and comfort: Although the cooling effect of fan products cannot achieve the constant temperature accuracy of air conditioning, by scientifically designing the air exchange rate, the temperature in the workshop can be reduced by 4-8 ℃ compared to outdoors, while maintaining high air circulation and freshness. Workers no longer feel stuffy and oppressed, and dizziness and fatigue are significantly reduced. The comfort level of work is greatly improved, which directly drives the improvement of production efficiency and the stability of product qualification rate.

Project Value and Customer Feedback

After the completion of the project, the workshop environment has been significantly improved. The workers work in the cool and flowing air, and their mental outlook is refreshed; The concentration of harmful gases in the workshop has significantly decreased, meeting occupational health and safety standards. The person in charge of the factory said, "Ruifeng not only helped us solve major problems, but more importantly, from our perspective, it considered the input-output ratio and truly achieved 'spending small money, doing big things'

Ruifeng Capability Extension

The success of the Fujian Jinjiang Shoe Factory project is another powerful proof of Ruifeng Environmental Protection Refrigeration's professional ability in the field of large space ventilation and cooling. Although the main body of the project is a shoe factory, the pain points it faces, such as "large space, high heat, dense personnel, air pollution, and cost sensitivity," are commonly present in many industry scenarios such as clothing factories, toy factories, electronics factories, packaging and printing factories, and warehousing and logistics centers.

We have comprehensive equipment selection capabilities for different building structures and production processes, as well as rigorous on-site survey and scheme design and construction capabilities. We always insist on starting from the actual needs of our customers and long-term operating costs, replacing expensive equipment with scientific solutions, and creating a comfortable working environment for enterprises that is both easy to use and affordable with professional technology.

If you also have similar ventilation and cooling needs, please feel free to contact Ruifeng Environmental Protection Refrigeration. We will provide you with a customized solution.