Team:Jilin China/Model/For Practices

For Practices
Energy Conservation

Model

  • Background

    For the potential use to lower down fermentation temperature, our RNA thermosensors can realize the energy conservation in fermentation production theoretically. Hence, we modeled the energy saving process based on the data from Ground.

    The schematic of fermenter has been shown below (Fig.1). Mixing system helps raw material to contact sufficiently with oxygen. And the heating jacket with flow inside is stable heat source of fermenter. The heat transfer with air should be considered as the main energy consumption. As a result, estimating the heat dissipated power is the first step to get the amount of energy saving.

    Fig 1. Fermenter

  • Methodology

    1. The Features

    Here are the features of the fermenters in Ground from HP(Table.1)

    material 304 stainless steel
    Radiating area 20.4 m2
    Capacity 6t
    Thermal conductivity 16W·m-1·K-1
    Board thickness 50 mm

    Here are the features of parameters in yogurt fermentation(Table.2)

    Real fermentation temperature 42℃
    Ideal fermentation temperature 39℃
    Fermentation duration 4h
    Environment temperature 25℃

    2. The simplifed radiating system

    Fig 2. the Radiating System

    According to the Figure. 2, the heat transfer process is relatively stable, which follows Newton’s law of cooling.

    3. Related thermodynamic equation

    Heat flux: A flow of energy per unit of area per unit of time. $$Φ_{q}=-k{{dT(x)}\over{dx}}$$ k means thermal conductivity, which is the property of a material to conduct heat. T(x) is a function of correlated with temperature distribution. Here, x represents the distance between one certain point and interior surface.(Fig 3.)

    Heat dissipated power: $$P=Φ_{q}A$$ A is the radiating area.

  • Results

  • Conclusions

    From the figures above, we got the amount of energy saving per degree down. According to Enterprise energy saving calculation method (GB/T13234-91), the energy measurement transferred into standard coal(see Table. 3).

  • Results

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