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_posts/2021-09-07-design-of-the-koji-room-koji-muro.md

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@@ -121,16 +121,16 @@ The koji room's ventilation must be sufficient to remove excess heat, humidity,
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Let's demonstrate which of these three design criteria is our limit, using our example.
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First, consider the requirements for **heat removal**. We can show that our 300kg of rice-koji at *hiki-komi* has a dry weight of 195kg, and will generate 1623W at the peak of its metabolism (see Appendix - [Step 4](step-4---determine-the-ventilation-requirements-for-heat-removal)). Our conductive heat losses were calculated to be 764W, so we know that ventilation for heat removal must equal 859W by exchanging indoor air with cold, outdoor air. This requires a ventilation rate of 41m³/h.
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First, consider the requirements for **heat removal**. We can show that our 300kg of rice-koji at *hiki-komi* has a dry weight of 195kg, and will generate 1623W at the peak of its metabolism (see Appendix - [Step 4](#step-4---determine-the-ventilation-requirements-for-heat-removal)). Our conductive heat losses were calculated to be 764W, so we know that ventilation for heat removal must equal 859W by exchanging indoor air with cold, outdoor air. This requires a ventilation rate of 41m³/h.
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![Heat balance of the koji room with ventilation sized for heat removal](/assets/images/koji_room/02kojiroomheat.png)
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Next, let's consider the requirements for **moisture removal**. About 80% of the heat generated by koji is lost as water vapour, with the remaining 20% lost due to other effects. At the peak of its heat generation, we can show that the our 300kg of koji will emit 2.16kg of water per hour (see Appendix - [Step 5](step-5---determine-the-ventilation-requirements-for-moisture-removal)). By exchanging moist indoor air with dry, outdoor air, we can show that a ventilation rate of **119m³/h** is necessary to remove the moisture emitted by koji.
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Next, let's consider the requirements for **moisture removal**. About 80% of the heat generated by koji is lost as water vapour, with the remaining 20% lost due to other effects. At the peak of its heat generation, we can show that the our 300kg of koji will emit 2.16kg of water per hour (see Appendix - [Step 5](#step-5---determine-the-ventilation-requirements-for-moisture-removal)). By exchanging moist indoor air with dry, outdoor air, we can show that a ventilation rate of **119m³/h** is necessary to remove the moisture emitted by koji.
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![Mass balance of the koji room with ventilation sized for moisture removal](/assets/images/koji_room/03kojiroomwater.png)
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Finally, let's consider the requirements for **carbon dioxide removal**. Koji has a respiratory coefficient of around 1.0 throughout its entire process, which means that the koji's peak heat generation of 1623W equates to a CO₂ generation rate of 0.3m³ CO₂/h (see Appendix - [Step 6](step-6---determine-the-ventilation-requirements-for-co-removal)) using the aerobic metabolism equation:
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Finally, let's consider the requirements for **carbon dioxide removal**. Koji has a respiratory coefficient of around 1.0 throughout its entire process, which means that the koji's peak heat generation of 1623W equates to a CO₂ generation rate of 0.3m³ CO₂/h (see Appendix - [Step 6](#step-6---determine-the-ventilation-requirements-for-co-removal)) using the aerobic metabolism equation:
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$$
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C_6H_{12}O_6+6O_2 \rightarrow 6CO_2 +6H_2O+2872kJ/\text{mol} \cdot \text{glucose}
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### 4. Heating
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Knowing that our maximum ventilation rate will be **119m³/h**, let's size the heating panels of the koji-room. Our conductive heat losses are 764W, and ventilating fresh air at 119m³/h removes 2480W of heat. Our koji generates 1623W of heat at its peak, so our heater must provide at least 1621W of heat (see Appendix - [Step 7](step-7---determine-the-heating-requirements)):
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Knowing that our maximum ventilation rate will be **119m³/h**, let's size the heating panels of the koji-room. Our conductive heat losses are 764W, and ventilating fresh air at 119m³/h removes 2480W of heat. Our koji generates 1623W of heat at its peak, so our heater must provide at least 1621W of heat (see Appendix - [Step 7](#step-7---determine-the-heating-requirements)):
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![Final heat balance the koji room with ventilation with ventilation sized for moisture removal](/assets/images/koji_room/05kojiroomfinal.png)
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