30 year old building has an old water storage tank on its rooftop. Upon inspection, the following observations were noted:  The tank is watertight  The tank imparts a slight metallic taste to the water  The external surface of the tank is unpainted  The rivets used in the tank construction are made of a lead alloy  The tank is secured against unauthorized access  There is a sanitary waste pipe running directly above the water tank.  There are no warning or overflow pipes installed  The tank is in a location that floods easily during heavy rain

Based on these observations, identify and describe all the potential problems in the design and operation of this water storage tank. (12 marks)

 

 Based on these observations, suggest THREE (3) potential materials that should be used in the construction of the replacement tank. (3 marks)

  You have been assigned to design the air-conditioning system for a large office complex with a cramped layout. You have a large budget, and your design must be energy-saving and environmentally-friendly. Briefly describe, with justification, whether you would choose a constant-air volume (CAV) or variable air volume (VAV) system. (10 marks)