Phase change materials such as paraffin wax and Glauber's salt are another thermal storage media. These materials are inexpensive, readily available, and can deliver domestically useful temperatures (approximately 64 °C or 147 °F). The "Dover House" (in Dover, Massachusetts) was the first to use a Glauber's salt heating system, in 1948. Solar energy can also be stored at high temperatures using molten salts. Salts are an effective storage medium because they are low-cost, have a high specific heat capacity and can deliver heat at temperatures compatible with conventional power systems. The Solar Two used this method of energy storage, allowing it to store 1.44 terajoules (400,000 kWh) in its 68 cubic metres storage tank with an annual storage efficiency of about 99%. COUNT 7
QSN1 Paraffin wax is an example of what kind of storage media? ANS1 thermal QSN2 The first Glauber's salt heating system was first used where? ANS2 The "Dover House" QSN3 What are some examples of phase change materials? ANS3 paraffin wax and Glauber's salt QSN4 What are the approximate temperatures that can be delivered by phase change materials? ANS4 64 °C or 147 °F QSN5 What was the name of the heating system that first used Glauber's salt? ANS5 Dover House QSN6 Why are salts good  for thermal storage? ANS6 they are low-cost, have a high specific heat capacity and can deliver heat at temperatures compatible with conventional power systems QSN7 How much energy was the Solar Two able to store using salts? ANS7 1.44 terajoules (400,000 kWh)