6. In solar-heated buildings, energy is often stored as sensible heat in rocks, concrete, or water during the day for use at night. To minimize the storage space, it is desirable to use a material that can store a large amount of heat while experiencing a small temperature change. A large amount of heat can be stored essentially at constant temperature during a phase change process, and thus materials that change phase at about room temperature are very suitable for this purpose. Determine how much heat (k) can be stored in a 5m3 storage space using water with a heat capacity of 4.00kJ/kgC and a temperature change of 20C. What would be the stored heat if the storage volume has tripled. Sensible-heat storage materials are known for low energy density. How does this affectthe design of thermal energy storage system