An HVAC System In An Office Building In Calgary, Canada, Is Used To Regulate Office Temperature: Process Control And Instrumentation Assignment, UOL, Ireland

An HVAC system in an office building in Calgary, Canada, is used to regulate office temperature and maintain a pressure cascade between the building and outside due to pollution. Due to Calgary’s climate, the HVAC system is required to both heat and cool air depending on weather conditions, which is accomplished using an electric heater and cooling water from a refrigeration system.

The following considerations are required:

– On cold days, it is desired to recover energy from exhaust air by passing through a heat exchanger to heat inlet air Electric heater is on/off only

– Temperature is adjustable in each room of the building

– Air is passed through HEPA filters in each room to remove particulates

the flow rate through filters must be monitored to detect blockages Outline a possible control system for the process by the following:

(i) Draw a process flow diagram for the process

(ii) Suggest control instrumentation to be utilized and the overall control systems composition

(iii) Discuss alarm rationalization, settings, and limits for the process

(iv) Discuss recipe hierarchy and structure for the process

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