Modeling

This year our team created a fermenter model of our light-induced self-lysin system. Our model informed the possible positions for company to input the light source. And it also provide cost budget in fermentation process for reference. This model, presenting below, consists of the ideal figure of fermenter and calculating process of the cost budget.

I. Fermentation Tank Model

Figure 1: Two possible positions to input the LED lamp:①fixing in the side of the fermentation tank;②fixing on the stirring shaft and rotating with the stirring shaft.

• The choice of light source:
  Considering that the fermentation broth is a multi-solute turbid solution and the flow of fermentation liquid will have a greater impact on the light-emitting device, we choose scattered high-power LED blue light source. It has many advantages such as high purity, low spectrum, low energy consumption, which suited for the process of fermentation.
• Related LED lights parameters：
  1. Wavelength λ = 435nm
  2. power P = 3W
  3. luminous flux Φ = 80lm (generally between 80 ~ 100lm / W)
  4. price k= 55 yuan
• Fermentation tank parameters:
  1. diameter D = 5280mm;
  2. height H = 11617mm;
  3. oval head short axle b = 1320mm

II. Cost Budget Model

• The required number of lamps
According to the experiment, light intensity should reach 20lux. In the Fermenter’s center cross section, the average illuminance (Eav) can be calculated with the following equation:
Φ- luminous flux of one lamp
N - the number of lamps
CU - the space utilization factor (the ratio of the luminous flux reaching the illuminated surface to the total luminous flux emitted by the fixture), which is related to the design of the LED lamp, the height of the installation, the geometric characteristics of the space and the reflectivity.
K - maintenance factor (light loss factor, the ratio of average illumination after a period of fermentation process to the average illumination while the system is on installation.
S - surface area