| Exercise
  purpose: | To become familiar with the specification of auxilliary systems including storage. | 
|   |  1.
  Specify a battery system; | 
|  |  2. Specify a CHP (Combined Heat and Power)
  system; | 
|  |  3. Specify a HWS (Hot Water Storage)
  system. | 
| Exercise
  result expected: | Ability
  to select an auxiliary system (such as battery, CHP, HWS etc.) and alter
  details of its specification. |