The diagram is used to engineer an air handling unit. In this example, we will show you how to calculate the following aspects of a unit using the Mollier diagram: • • •
Cooling coil Heater capacity Steam humidifie
We start by establishing the outside and inside conditions. This is our field of operation, which sets the boundaries within which we work. A common mistake is to set the conditions extremely high. To be ‘on the safe side’. We often get requests for outside conditions like 50°C – 80%RH. Not only are these impossible ambient conditions, it will make the installation unnecessary heavy and more difficult to operate. For this example, we will assume the following conditions: Outside: Inside:
35 °C – 70% RH 21 °C – 60% RH
Energy ef ficiency
Every system reduces energy loss by using the heat or cold that are already present and transferring part into the outside air. There are a range of ways to reduce energy, each of which has its pros and cons. In this example, we will use one of the most common methods: a recirculation rate of 50%.
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