Before designing a prototype PV system the regulatory requirements for HVAC systems in the workplace were determined, from research looking at specific requirements for individual aspects in air quality control: CO2 levels, humidity temperature and airflow. From the research a set criteria was established that was adhered to through the different phases of the project. These parameters are shown in the following table. 

 

 

 

 

 

 

 

 

 

 

 

 

As this project took place during the winter months in Scotland there were temperature considerations that needed to be accounted for thermal comfort and energy consumption as they were key factors in making the PV system economically viable. Using previous studies as a guide 20°C was the preliminary bench mark temperature chosen for testing. As the PV system would be in the immediate vicinity of the workers the air flow had to circulate without causing irritation. With the users comfort in mind the system was designed with a flow rate range of 1.21 to 1.61l/s to provide fresh air without the feeling of a draft.

 

The diffuser head was a main consideration as the intention was to have a design that would be able to deliver air to the person, whilst still being aesthetically pleasing. Such considerations included diffuser geometry/dimensions, distance to occupant, temperature variance, air distribution and direction. These issues were tackled using Pugh's matrices found here and the CFD analysis found here.