ermentation Desigh The following is how the heat transfer surface area could be designed for a small fermenter. The minimum heat transfer surface area has been alculated(based on the data below)and presented in Table 2 Assume S/S fermenter capacity 30,000gal Agitator 15hp/1,000gal Heat of fermentation(peak) 100 Btu/hr/gal Heat of agitation 38 Btu/hr/gal Heat transfer. U coils 120 Btu/hr/sq ft Heat transfer, u jacket 80 tw/hr sq ft No Btu lost in evaporation Chilled water supply 50°F Chilled water return 60°F Broth temperature(28C) Table 2. The heat Transfer Surface Area(ft2)Required for Tank with Coils onl Jacket Only Mechanical agitation Air agitation onl 150 After the heat transfer surface area requirements are known, various shaped(height to diameter)tanks should be considered. Table 3 illustrates parameters of 30,000 gallon vessels of various h/d ratiosFermentation Design 9 7 The following is how the heat transfer surface area could be designed for a small fermenter. The minimum heat transfer surface area has been calculated (based on the data below) and presented in Table 2. Assume: S/S fermenter capacity Agitator Heat of fermentation (peak) Heat of agitation Heat transfer, U coils Heat transfer, U jacket Safety factor Chilled water supply Chilled water return Broth temperature (28°C) Table 2. The Heat Transfer 30,000 gal 15 hp/ 1,000 gal 100 Btu/hr/gal 38 Btu/hr/gal 120 Btu/hr/sq A 80 Btu/hr sq A No Btu lost in evaporation 50°F 60°F 82°F Surface Area (A2) Required for Tank with: Coils Only Jacket Only Mechanical agitation 200 Air agitation only 150 5 6 After the heat transfer surface area requirements are known, various shaped (height to diameter) tanks should be considered. Table 3 illustrates parameters of 30,000 gallon vessels of various WD ratios