Low-emissions heating, cooling, and hot water system

A hydronic system, comprising:

• a control unit, comprising:
• a memory comprising stored instructions;
• and
• a processor configured to execute the stored instructions to cause the control unit to perform at least:
• monitoring a volume of chilled water in a cold storage tank via a second set of flowmeters;
• monitoring a second outlet temperature of the cold water within the cold storage tank via a second temperature sensor;
• operating a heat pump unit for recharging the chilled water within the cold storage tank, the heat pump unit being operated when a respective predetermined limit is attained for at least one of the volume of chilled water or the second outlet temperature;
• and
• determining a time period required for recharging the volume of chilled water, the time period determined based on the volume of chilled water, the second outlet temperature, and an operation cycle, the operation cycle being at least an on-peak operation cycle or an off-peak operation cycle,
• wherein the control unit is configured to:
• determine the operation cycle to be the on-peak operation cycle or the off-peak operation cycle based on one or more of day-ahead hourly prices, a temperature forecast, or a day-ahead greenhouse gas emissions forecast, and
• operate the heat pump unit instantaneously for recharging the chilled water within the time period, when at least one of the volume of chilled water or the second outlet temperature has reached the respective predetermined limit, and the operation cycle is the on-peak operation cycle.