1. Thermal mass. Define specific heat. What are its usual units? How would you calculate the specific heat per unit volume from the specific heat per unit mass? If you wanted to select a material for...

1. Thermal mass. Define specific heat. What are its usual units? How would you calculate the specific heat per unit volume from the specific heat per unit mass? If you wanted to select a material for a compact heat storing device, which of the two would you use as a criterion of choice?

2. Importance of the value of exchange constants. In a far-away land, fridges cost the same as they do here and last just as long (10 years), but electrical energy costs 10 times more—that is, it costs $2/kWh. Make a copy of the trade-off plot for fridges (Figure 10.7) and plot a new set of penalty lines onto it, using this value for the exchange constant, αe. If you had to choose just one fridge to use in this unfortunate land, which would it be? In another 20 years, it may be us.