A refrigeration cycle apparatus includes: a first refrigerant route; and a second refrigerant route. In the first refrigerant route, refrigerant flows in order of a compressor, a first heat exchanger, a first pipe, a second heat exchanger, a low pressure receiver and the compressor. The second refrigerant route is connected to the first pipe and the low pressure receiver, the first pipe being connected to the first heat exchanger and the second heat exchanger in the first refrigerant route. The second refrigerant route includes an electric pump. The electric pump is configured to flow the refrigerant from the low pressure receiver to the first pipe.

A refrigeration system includes an evaporator configured to receive a flow of refrigerant and transfer heat into the refrigerant within the evaporator to provide cooling for a temperature-controlled space, an expansion valve operable to modulate the flow of refrigerant into the evaporator, a liquid level sensor configured to measure a level of liquid accumulated within a component of the refrigeration system, and a controller configured to operate the expansion valve to increase the flow of refrigerant into the evaporator or decrease the flow of refrigerant into the evaporator based on the level of liquid measured by the liquid level sensor.

Refrigeration circuit (1a) comprising in the direction of flow of a circulating refrigerant: a compressor unit (2) comprising at least one compressor (2a, 2b, 2c); a heat rejecting heat exchanger/gas cooler (4); a high pressure expansion device (6); a receiver (8); an expansion device (10); an evaporator (12); and a low pressure gas-liquid-separation unit comprising at least two collecting containers (32, 34) which are configured for alternately separating a liquid phase portion from the refrigerant leaving the evaporator (12) and delivering the separated liquid refrigerant back to the receiver (8).

A refrigerant recovery management system includes a display and a computer. The computer executes a data input program to present a screen on the display. The screen is configured for a user to input information regarding refrigerant that has been recovered from refrigerant use equipment and is to be sent to a refrigerant treatment practitioner that conducts a refrigerant treatment on the refrigerant. The computer is configured to: generate request data for sending the refrigerant to the refrigerant treatment practitioner, the request data including information regarding the refrigerant; generate report data regarding the refrigerant treatment for reporting the refrigerant treatment to a manager that manages refrigerant recovery, the report data including information regarding the refrigerant; and determine a conformity between the request data and the report data by determining whether information regarding the refrigerant included in the request data agrees with information regarding the refrigerant included in the report data.

A refrigeration apparatus (1) includes a heat-source-side unit (10) using a refrigerant that works in a supercritical region. The heat-source-side unit (10) includes a compression element (20) configured to compress the refrigerant, a heat-source-side heat exchanger (24), an expansion valve (26) provided downstream of the heat-source-side heat exchanger (24), a receiver (25) provided downstream of the expansion valve (26), and a control unit (101). The control unit (101) performs a first operation for evaluating the amount of the refrigerant based on a high-pressure-side pressure, on a first condition that the internal pressure of the receiver (25) be equal to or less than a supercritical pressure.

A refrigeration system comprises: a compressor, a first heat exchanger, a reservoir, a throttling element and a second heat exchanger in the refrigeration circuit. The refrigeration system comprises a cooling mode and a hot-gas bypass heating mode. In the hot-gas bypass heating mode, the refrigerant leaving the outlet of the compressor is delivered directly to the second heat exchanger before returning to the inlet of the compressor, wherein, the refrigeration system further comprises a branch flow path with a control valve provided thereon. The control valve is capable of being opened or closed in the hot-gas bypass heating mode.

A refrigerant control system includes: a charge module configured to determine an amount of refrigerant that is present within a first portion of a refrigeration system within a building; and an isolation module configured to selectively open and close an isolation valve of the refrigeration system and to, via the isolation valve, maintain the amount of refrigerant within the first portion within the building below a predetermined amount of the refrigerant.

A method for estimating refrigerant charge for an HVACR system is provided. The method includes obtaining one or more system parameters during operation. The one or more system parameters include at least one of compressor suction superheat, system mass flow, expansion device mass flow or opening degree, compressor suction saturated temperature, and compressor discharge saturated temperature. The method also includes conducting a regression analysis on the one or more system parameters to determine one or more predictive parameters for estimating the refrigerant charge. The method further includes determining a predictive model based on regression analysis. The predictive model establishes a relationship between the refrigerant charge and the one or more predictive parameters. Also the method includes estimating the refrigerant charge based on the predictive model.

The present disclosure relates to controls and related methods for mitigating liquid (e.g., compressor refrigerant, etc.) migration and/or floodback.

A refrigeration cycle apparatus includes: a first refrigerant route; and a second refrigerant route. In the first refrigerant route, refrigerant flows in order of a compressor, a first heat exchanger, a first pipe, a second heat exchanger, a low pressure receiver and the compressor. The second refrigerant route is connected to the first pipe and the low pressure receiver, the first pipe being connected to the first heat exchanger and the second heat exchanger in the first refrigerant route. The second refrigerant route includes an electric pump. The electric pump is configured to flow the refrigerant from the low pressure receiver to the first pipe.