The present disclosure relates to particle-based thermal energy storage (TES) systems employed for the heating and cooling applications for residential and/or commercial buildings. Particle-based TES systems may store thermal energy in the particles during off-peak times (i.e., when electricity demand and/or costs are relatively low) and remove the stored thermal energy for heating or cooling applications for buildings during peak times (i.e., when electricity demand and/or costs are relatively high).

There is herein described energy storage systems. More particularly, there is herein described thermal energy storage systems and use of energy storable material such as phase change material in the provision of heating and/or cooling systems in, for example, domestic dwellings.

A heat pump system includes a first unit; a second unit connected to a first flow path of the first unit; and a third unit connected to a second flow path of the first unit and connected to the second unit. The heat pump system can operate in a cooling and water heating mode and a heating and water heating mode, wherein, in the cooling and water heating mode, the heat pump system is configured to switch a switching assembly to a first position and connect the at least one first heat exchangers and the second heat exchanger in series; in the heating and water heating mode, the heat pump system is configured to switch the switching assembly to a second position and connect the second heat exchanger and the at least one third heat exchangers in parallel.

A tank-type water heater includes a storage tank and a heating circuit outside of the tank. The heating circuit includes at least one heat engine and at least one pump for circulating water from the bottom of the tank through the heat engine and back to the top of the tank. A stratifier introduces the heated water from the heating circuit into the top of the tank in a diffuse manner to promote stratification of hot water in the tank.

A heat exchanger is disclosed. The heat exchanger of the present disclosure includes a first heat exchanger into or from which a first fluid flows or is discharged, and a second heat exchanger into or from which a second fluid flows or is discharged, the second heat exchanger being adjacent to the first heat exchanger, and the first heat exchanger and the second heat exchanger are rolled together in a roll shape, are alternately disposed in a radial direction, and are in contact with each other.

A heat exchanger includes a heating fluid flow path through which a heating fluid flows, a heated fluid flow path through which a heated fluid flows, a heat radiation unit that stacks a plurality of heat radiation plates in a thickness direction to thereby form a heat radiation flow path communicating with the heating fluid flow path between a plurality of heat radiation plates, a heat receiving unit provided stacked in the thickness direction of the heat radiation plates forming the heat radiation unit, that stacks a plurality of heat receiving plates in the thickness direction to form a heat receiving flow path communicating with a heated fluid flow path between the plurality of heat receiving plates, a heat storage unit formed of a space between the heat radiation unit and the heat receiving unit and a heat storage material filled inside the heat storage unit.

An energy generating system for generating thermal energy and electrical energy for a premises. The system includes an engine that drives an AC power generator to supply supplemental or standby power to the premises. The thermal energy given off by the engine is also coupled to the premises to provide heat thereto. A processor controls the various parameters of both the energy generating system and the premises to coordinate the proper heating and cooling thereof.

Systems and methods are disclosed for exchanging thermal energy between a drain liquid and a source liquid for heating or cooling of the source liquid. One method for heating a source liquid may involve transferring heat from a drain liquid using a heat pump. A system may include a refrigerant, a source liquid and a drain liquid, two or more heat exchangers that facilitate an exchange of thermal energy, and a means for transporting the refrigerant.

An energy transfer system that includes a tank comprising an outer wall having a circumference. A first fluid pathway surrounds a portion of the circumference of the tank. A second fluid pathway seals the portion of the circumference of the tank and the first fluid pathway from the environment.

There is herein described energy storage systems. More particularly, there is herein described thermal energy storage systems and use of energy storable material such as phase change material in the provision of heating and/or cooling systems in, for example, domestic dwellings.