A refrigeration system includes a heat exchanger configured to place a cooling fluid in a heat exchange relationship with a working fluid, a free-cooling circuit having a pump configured to circulate the working fluid through the heat exchanger and a condenser, a flow control valve configured to control a flow rate of the working fluid to the condenser, a condenser bypass valve configured to control a flow rate of the working fluid that bypasses the condenser, and a controller configured to adjust a position of the flow control valve, a position of the condenser bypass valve, a speed of a fan of the condenser, a speed of the pump, and a temperature of a heater based on an ambient temperature, a temperature of the working fluid leaving the condenser, the position of the flow control valve, the position of the condenser bypass valve, or a combination thereof.

An air conditioning apparatus and a method for controlling an air conditioning apparatus are provided. The air conditioning apparatus may include a controller that performs an abnormal operation diagnosis of the air conditioning apparatus based on an output signal of a pump, thereby directly checking introduction of air into pipes or clogging of valves.

When a state in which a driving voltage of a pump is set to an upper limit voltage and an opening degree of at least one of a plurality of flow rate control valves is set to a maximum opening degree continues for a first determination time period, an operation frequency of a compressor is raised at a first time so as to increase an amount of heat exchange by a second heat exchanger. When an operation stop request is input, or an indoor temperature reaches a set temperature, in at least one of a plurality of third heat exchangers after the first time, the operation frequency of the compressor is lowered or the driving voltage of the pump is lowered.

Disclosed is a multifunctional storage system including a machine chamber and a compartment, in which clothes are received, the multifunctional storage system including: a heat pump unit located in the machine chamber and including an evaporator, a condenser, a compressor, and a pressure controller; a moisture supply unit coupled to the heat pump unit and including a humidification filter; and a fan unit configured to circulate air in the machine chamber from the evaporator toward the condenser, wherein the moisture supply unit is coupled to a front end of the evaporator with reference to a circulation direction of the air, and wherein moisture is supplied to the humidification filter according to a preset condition, and loads of the evaporator and the condenser are increased as the moisture is supplied to the air when the air passes through the humidification filter.

A cooling apparatus includes a heat receiver that evaporates a low pressure heat transfer medium; a compressor that compresses the evaporated heat transfer medium in a gas phase state, a condenser that condenses the compressed heat transfer medium, a receiver tank that receives and stores at least one of the heat transfer medium from any place in a flow path of the heat transfer medium in the gas phase state that returns the heat transfer medium to the heat receiver and the condensed heat transfer medium in a liquid phase state, an air storage tank that introduces and stores air separated from the heat transfer medium in the receiver tank, and a liquid level controller that controls a liquid level in the receiver tank such that the heat transfer medium in the liquid phase state is stored in the receiver tank at a predetermined liquid level height.

Systems and methods for regenerative ejector-based cooling cycles that utilize an ejector as the motivating force in a cooling loop to regeneratively sub-cool a refrigerant in a single-stage cooling cycle.

Embodiments of the present disclosure are directed toward systems and method for cooling a refrigerant flow of a refrigerant circuit with a cold cooling fluid flow from a thermal storage unit to generate a warm cooling fluid flow, thermally isolating the cold cooling fluid flow and the warm cooling fluid flow in the thermal storage unit, and cooling the warm cooling fluid flow from the thermal storage unit in a chiller system to at least partially produce the cold cooling fluid flow.

An apparatus includes a heat sink configured to receive thermal energy from one or more heat sources. The heat sink includes a local reservoir configured to hold a liquid coolant, and the heat sink is configured to pass the thermal energy into the liquid coolant in the local reservoir in order to vaporize at least some of the liquid coolant. The apparatus also includes a membrane configured to allow vaporized coolant to pass through the membrane out of the local reservoir into an ambient environment and to prevent unvaporized coolant from passing through the membrane. The membrane is thereby configured to provide passive flow control for the liquid coolant. The membrane could include a vapor-permeable and liquid-repelling membrane. The membrane can also be configured to hold the liquid coolant in the local reservoir against one or more surfaces of the heat sink.

A refrigeration system includes a chiller with an integrated free cooling system and refrigeration system. In certain embodiments, the chiller may be a single package unit with all equipment housed within the same support frame. The chiller may generally include three modes of operation: a first mode that employs free cooling, a second mode that employs free cooling and implements a refrigeration cycle, and a third mode that uses the free cooling system to remove heat from the refrigeration system. A heat exchanger may be shared between the free cooling system and the refrigeration system to transfer heat from the refrigeration system to the free cooling system.

A two-phase cooling system with flow boiling, characterized in that a closed hydraulic circuit apparatus of a heat transfer refrigerating fluid is provided, including: a pump for a refrigerating fluid which, at least in some stretches of the circuit, is two-phase liquid-vapor or multi-phase; a heat sink-evaporator configured to transfer heat by conduction from a component to be cooled to the refrigerating fluid; a condenser, capable of condensing the vapor which develops on the evaporator while simultaneously dissipating the heat given by the refrigerating fluid both by conduction, convection and radiation and by condensation into the environment; a tank which also acts as an expansion vessel, or a tank and an expansion vessel which are distinct and connected to each other; and a plurality of sensors, including flow rate, pressure and temperature sensors and an electronic control system of the pump.