A DC-powered system may include controls configured to switch between available DC power supplies and manage the refrigeration system in accordance with one or more methods. The one or more methods of the control system may include multiple tiers of power management, including, e.g., maximization of power usage when on a photovoltaic power supply to subcool a refrigerated load.

A solar powered closed loop system and method for powering a cooling unit. The system and method provide a fully closed system that harnesses the power of the sun with a solar energy collecting device to generate vapor. The vapor has characteristics of high energy, expansion, and compressibility that enable travel through a plurality of conduits in the closed loop. The system generates vapor, carries the vapor and resultant gas, expands energy, and produces condensate through use of: a vapor expander, a compressor, a gas-liquid heat exchanger, an accumulator, an air-to-air heat exchanger, and a vapor condenser. Thus, through expansion, compression, and conversion different states of the vapor are controllably generated and disbursed for work. The work generated from the expansion and energy release from the vapors and gases produces work for powering the air-to-air heat exchanger, such as a cooling unit, and driving a load.

The invention relates to a method for operating a heat pump system, a heat pump system and an HVAC system measuring a solar irradiance, wherein the operation of the heat pump is adjusted based on the solar irradiance.

A method of operating a multiple energy source of a transport refrigeration unit determines if the transport refrigeration unit is at idle. The method may then electrically switch a condenser fan motor from an electrical power source to a battery charging circuit. The condenser fan motor may be back-driven via wind blowing through a condenser fan. Electrical power is thereby generated and applied to charge a battery via a battery charging circuit.

A DC-powered refrigeration system may include controls configured to switch between available DC power supplies and manage the refrigeration system in accordance with one or more methods. The one or more methods of the control system may include multiple tiers of power management, including, e.g., maximization of power usage when on a photovoltaic power supply to subcool a refrigerated load.

A method of operating a multiple energy source of a transport refrigeration unit determines if the transport refrigeration unit is at idle. The method may then electrically switch a condenser fan motor from an electrical power source to a battery charging circuit. The condenser fan motor may be back-driven via wind blowing through a condenser fan. Electrical power is thereby generated and applied to charge a battery via a battery charging circuit.

Temperature-controllable container with vacuum insulation elements and with an interior space, which container comprises a wall with an opening for objects to be placed into the interior space, and a door element closing the opening, wherein transport elements are arranged on an outer surface of the container, which transport elements are designed to enable lifting by means of a transport vehicle, and wherein the container further comprises a temperature control unit which is designed so as to bring the interior space to a predetermined temperature T, wherein the temperature control unit comprises a heating/cooling unit operated via a solar energy device or a heating/cooling unit operated via a power supply network, and wherein a receptacle means for melt-storage elements or sample bodies is arranged in the interior space, which receptacle means is designed so as to position at least two melt-storage elements or sample bodies at a distance from each other.

A system and a method are provided for cooling heat-generating devices. A plurality of heat exchangers are in thermal communication with a plurality electronic devices. Each of the plurality of heat exchangers includes at least one channel configured to receive and circulate a working liquid. Each of the plurality of heat exchangers may be a cold plate, an air cooler, and a combination thereof. The plurality of heat exchangers include at least one cold plate in direct contact with at least one of the plurality of electronic device. At least one air cooler circulates air and convectively absorbs heat from the remaining electronic devices.

A system and a method are provided for cooling devices and recovering waste heat. A plurality of heat absorption devices in direct or indirect thermal contact with a plurality electronic devices, and comprise channels to receive an evaporable working liquid, which becomes a first 2-phase mixture having a first liquid portion and a first vapor portion upon absorption of heat from the devices. At least one compressor compresses the first vapor portion to form a compressed vapor having elevated pressure and temperature. At least one heat exchanger condenses the compressed vapor to liquid so as to release the heat. An expansion device is used to expand the liquid to provide a second 2-phase mixture comprising a second liquid portion and a second vapor portion. In at least one vapor-liquid separator, the first liquid portion and the second liquid portion are fed back to the plurality of heat absorption devices. The second vapor portion is fed back to the at least one compressor.

The energy system includes a heat exchanger absorbing heat energy from its environment, and a heat pump transferring energy from the heat exchanger to a heat-consuming circuit. The heat pump includes a regulator arranged so as to regulate a temperature of the heat exchanger at a temperature below a liquefaction and/or freezing temperature of the water vapor of the ambient air. The regulator is also arranged so as to regulate the temperature according to weather conditions, which the heat exchanger is exposed to, such as rain, wind, and sun.