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 device for climate control of a building (20), in which flatly formed external temperature elements (5) at least partially cover an outer side of the building (20), wherein the external temperature-control elements (5) are settable to a predefinable temperature value. Furthermore, a temperature-control element (5) and a method for climate control of a building (20) are specified.

A method of conditioning wastewater includes flowing wastewater into and through a first fluid tube and flowing a heat transfer fluid into and through a second fluid tube. The heat transfer fluid entering the second fluid tube has a different temperature than the wastewater entering the first fluid tube. The first fluid tube and said second fluid tube are positioned within a first casing that is surrounded by insulation. The first casing and the insulation are positioned within a second casing. The wastewater in said first fluid tube and said heat transfer fluid in said second fluid tube are arranged to allow heat transfer between the wastewater in said first fluid tube and the heat transfer fluid in said second fluid tube.

A heat pump system includes a compressor coupled to a first variable speed motor, a first heat exchanger, a geothermal heat exchanger, a fan coupled to a second variable speed motor, and an expansion device. The heat pump system also includes a refrigerant loop which fluidly couples the compressor, the geothermal heat exchanger, the expansion device, and the first heat exchanger. The heat pump system also includes a controller configured to adjust a first speed of the first variable speed motor, a second speed of the second variable speed motor, and an operation of the expansion device based upon a thermal energy demand.

A thermal-energy exchange and storage system has a borefield with a core zone and at least one capacity expansion zone. Each of the core zone and the at least one capacity expansion zone have a plurality of boreholes. The at least one capacity expansion zone is positioned outwards from and encircling the core zone and each additional capacity expansion zone is positioned outwards from and encircling the previous capacity expansion zone. A heat source is provided in fluid communication with a heat exchanger. An injection system circulates an operating fluid. The injection system has at least one U-tube installed within the plurality of boreholes and operating fluid is circulated between the at least one U-tube and the heat exchanger for transferring heat from the heat source. An extraction system is provided for extracting heat stored in the system for use in an infrastructure.

A refrigeration and/or heat transfer device includes a heating section and cooling section, a release member, and a one-way check valve affixed together in a continuous loop so working fluid may flow in one direction therein. The heating section absorbs heat and transfers such heat to the working fluid, thereby heating, expanding and increasing pressure upon the working fluid therein. The pressurized working fluid is released in a regulated manner from the heating section to the cooling section, thereby carrying the heat away. The released working fluid cools and transfers its heat to the surroundings within the cooling section. As released working fluid enters the cooling section, such fluid displaces already cooled working fluid, pushing such fluid through the one-way check valve back into the heating section to absorb heat. The working fluid may undergo a phase change or remain in a single phase throughout to enhance heat transfer.

The disclosure describes trench-confirmable geothermal reservoirs that can snugly abut trench walls (that may be of virgin, compacted earth) for facilitating heat exchange and flow liquid from one lower end to an opposing top end, and vice versa, depending on desired heat exchange. The direction can be reversed for summer and winter heat/cooling configurations. A series of the reservoirs may be used for appropriate heat transfer. The water volume of the reservoirs is relatively large and slow moving for good earth heat conduction.

A heat delivery system for agricultural applications, the system including: piping including alternate heat insulated segments and heat transferring segments, the piping being configured with a fluid flow path extending through the alternating heat insulated segments and heat transferring segments; and a fluid propelling arrangement configured for motivating flow of heat accommodating fluid within the fluid flow path.

The present application discloses a control method for an HVAC system in a relatively large spatial place and the HVAC system. The HVAC system comprises an air handling unit, and the air handling unit is provided with a valve through which a fluid medium passes and a fan; and the method comprises: monitoring a return air temperature of air circulated back to the air handling unit; providing a return air temperature setpoint of the HVAC system; and performing decoupling adjustment on one of the fan and the valve, and then adjusting the other of the fan and the valve so that the return air temperature is close to the return air temperature setpoint. According to the present application, the HVAC system can operate in a steady and energy-saving way.

A dehumidification•evaporation cooling-based all-fresh-air air conditioning system according to one embodiment of the present invention may provide, a dehumidification•evaporation cooling-based all-fresh-air air conditioning system changes a humidity, temperature and enthalpy of an external air which is provided from an external air inlet, to provide a changed first air to an air conditioning space or discharge a second air stayed in the air conditioning space from the air conditioning space to an outlet, the dehumidification•evaporation-based all-fresh-air air conditioning system comprising, a piping module configured to provide a transfer passage of the external air, the first air and the second air, a humidity control unit configured to controls the humidity of the external air, wherein the humidity control unit located on the piping module, a temperature control unit configured to control temperature, humidity and enthalpy of supplied air to be the first air, wherein the temperature control unit located on the piping module, a path setting unit configured to change a transfer path of the external air, the first air and the second air, wherein the path setting unit located on the piping module and a control unit which decides the transfer path of the air from the external air inlet to the air conditioning space or the air conditioning space to the outlet, and controls the path setting unit for transferring air to the decided transfer path based on a first information related to a humidity, a temperature and an enthalpy of the external air.