Yes, water/sand based solutions can and should be deployed today for short/medium term heat storage, ie days, maybe weeks if volume and/or insulation is sufficient.
MOST fluids are promising as they store energy in their structure then release heat. So those shouldn’t loose heat nor require insulation when stored. If they make it practical, it should allow smaller-scale longer-term storage (months). Until then let’s keep deploying existing proven tech.
Yes, water/sand based solutions can and should be deployed today for short/medium term heat storage, ie days, maybe weeks if volume and/or insulation is sufficient.
MOST fluids are promising as they store energy in their structure then release heat. So those shouldn’t loose heat nor require insulation when stored. If they make it practical, it should allow smaller-scale longer-term storage (months). Until then let’s keep deploying existing proven tech.