1136results about "Compression machines with cascade operation" patented technology

A thermal management system, comprising: a primary coolant circulation system for cooling a first coolant by circulating the first coolant which is heat-exchanged with cooling water through a first water-cooled condenser; a secondary coolant circulation system for cooling a battery chiller by using a second coolant which is heat-exchanged with the first coolant of the primary coolant circulation system; and a second cooling line for cooling a battery by circulating cooling water which is heat-exchanged through the battery chiller, wherein the number of revolutions of the first condenser of the primary coolant circulation system is less than the number of revolutions of the second condenser of the secondary coolant circulation system, or the first coolant and the second coolant are heat-exchanged via the cooling water, such that the battery can be cooled efficiently during rapid charging.

The invention discloses a Carnot battery system based on a cross-seasonal energy storage technology and a control method, and the Carnot battery system comprises a cascade heat pump unit, a buried pipe heat storage unit, an organic Rankine cycle unit and a renewable heat source utilization energy storage unit, when the temperature of the external environment is high in summer, heat exchange with the external environment can be conducted through the first heat removal and exchange module to provide a heat source for the second heat removal and exchange module, and heat exchange is conducted through the second heat removal and exchange module so that the temperature of a power generation fluid medium can be increased; when the external environment temperature is low in winter, a heat source can be provided for the second heat removal and exchange module through heat exchange between the first heat exchange module and the buried pipe heat storage unit, heat exchange is conducted through the second heat removal and exchange module so that the temperature of a power generation fluid medium can be increased, and the energy storage system is prevented from being affected by the external temperature; and high-efficiency operation in different seasons is ensured. The method provided by the invention solves the technical problem of low power generation efficiency in winter by utilizing environment heat exchange in the Carnot battery energy storage technology in the prior art.

The utility model discloses a cascade heat pump system which comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a first compressor and a second compressor. The first heat exchanger is arranged in an outdoor environment and exchanges heat through an outdoor fan; the second heat exchanger comprises a first passage and a second passage and is used for heat exchange between a refrigerant in the first passage and a refrigerant in the second passage; the first compressor, the first heat exchanger and the first passage form a first cycle; the third heat exchanger exchanges heat with the liquid heat exchange medium; the second compressor, the second passage and the third heat exchanger form a second cycle; the fourth heat exchanger exchanges heat with the liquid heat exchange medium and forms a third cycle with the first heat exchanger and the first compressor; the first cycle and the second cycle are in linkage heating operation or the third cycle is in linkage operation; and the third cycle can be used for refrigerating or heating. According to the utility model, high-efficiency operation and high-efficiency defrosting of the system are realized when the compression ratio is medium and small, the power of an outdoor fan is not increased, and energy and cost are saved.

The utility model relates to an oil way system, a cascade unit, energy-saving equipment and refrigeration equipment, the oil way system comprises a first heat exchanger, a first oil tank and a second oil tank, a first channel and a second channel are arranged in the first heat exchanger, and heat exchange can be conducted between the first channel and the second channel; two ends of the first oil tank are respectively communicated with the first channel to form a first circulating oil path; the two ends of the second oil tank communicate with the second channel to form a second circulating oil way. According to the oil way system, when the oil temperature in the first oil tank and the oil temperature in the second oil tank have a large temperature difference, the oil temperature of one oil tank is too low, and the oil temperature of the other oil tank is too high or too high, heat exchange between the two circulating oil ways can be achieved through the first heat exchanger; and therefore, the conditions of too low oil temperature and too high oil temperature are relieved synchronously, and normal operation of an oil way can be guaranteed. No extra heating assembly or oil cooling assembly is needed, and the power consumption and the manufacturing cost of the oil way system can be obviously reduced.

A system for generating steam for industrial heat. The system may include a plurality of heat pump cycles in thermal communication with each other and in thermal communication with a steam generation cycle. The plurality of heat pump cycles may include first and second heat pump cycles. The first heat pump circulates a first a working fluid and includes a first heat exchanger. The second heat pump cycle circulates a second working fluid and includes a second heat exchanger. The first heat exchanger transfers heat from the first to the second working fluid. The second heat exchanger transfers heat to a third working fluid in the steam generation cycle.

The utility model relates to the technical field of cascade refrigeration, and provides a cascade refrigeration system which comprises a first circulation system, a second circulation system and a third circulation system, the first circulation system comprises a first evaporator, an oil-free centrifugal compressor, a cascade heat exchanger and a first liquid reservoir, and the cascade heat exchanger comprises a first condenser; an outlet of the first evaporator, the oil-free centrifugal compressor, the first condenser, the first liquid reservoir and an inlet of the first evaporator are communicated in sequence; a refrigerant of the first circulation system is carbon dioxide. The oil-free centrifugal compressor is adopted, oil-free operation is carried out in the first circulating system, the system is simplified, the influence of lubricating oil on the heat exchange efficiency is eliminated, the reliability and safety of the cascade refrigeration system are improved, and the refrigerant charge amount is reduced.

The invention discloses an oil return control method and system of a cascade heat pump system, and the control method comprises the following steps: 1, detecting a first state parameter of an intermediate heat exchanger so as to adjust a compressor and a throttling device at a low-temperature side and a high-temperature side, and when a second state parameter at the low-temperature side meets a condition, adjusting the compressor and the throttling device at the high-temperature side; the operation frequency of the compressor on the low-temperature side / high-temperature side is adjusted again, and return oil flushing is conducted on the intermediate heat exchanger; the second method comprises the following steps: respectively calculating the accumulated carbonization time of the corresponding lubricating oil in the low-temperature side or the high-temperature side, and judging whether the lubricating oil is replaced or not based on the accumulated carbonization time; and the third method comprises the steps that the accumulated low-frequency operation duration of the compressor on the low-temperature side or the high-temperature side in the low-frequency state is detected, and when the triggering condition is met, the operation frequency of the compressor is increased. Based on the control method, the operation reliability and the energy efficiency performance of the cascade heat pump system are improved, and the service life of equipment is prolonged.

The utility model relates to a liquid air production device which comprises a raw material air compression system, an air cooling and drying system, a circulating pressurization system, an expansion refrigeration system, a heat exchange cold box and a liquid air storage tank. The raw material air compression system comprises a gas feeding air compressor and an air cooler; the air cooling and drying system comprises a freezing dryer and an adsorption dryer; and the circulating supercharging system comprises a circulating supercharger and a supercharging cooler. According to the production method, efficient production of liquid air is achieved through the steps of multi-stage compression, cooling, drying, pressurization, expansion refrigeration and the like. By optimizing energy utilization, low-temperature air cooling capacity is recycled, compression work and power consumption are saved, and the production cost is remarkably reduced. The device is suitable for the fields of energy storage, metal smelting, precision manufacturing and the like.

To provide a heating apparatus and method for realizing high performance while optimizing energy consumption.SOLUTION: An industrial apparatus comprises: a circuit (2) in which an operating fluid circulates, the circuit (2) comprising means (20) for heating the operating fluid and removing an evaporator; a circulating line (31) in which a heat transfer fluid circulates, the flow rate of the heat transfer fluid in the circulating line (31) being 10-500 m3 / h; a first heat exchanger (901) placing the circuit (2) and the circulating line (31) in thermal communication; and an industrial heater (92) comprising a second heat exchanger (902) where the circulating line (31) passes. The heating means (20) comprises a piston pump (21).SELECTED DRAWING: Figure 1

The utility model relates to a coupling energy supply system based on LNG and a fuel cell, a gas supply unit comprises an LNG storage tank and an LNG vaporizer which are connected through an LNG pipeline, the LNG vaporizer is connected with a downstream gas pipeline through a gas supply pipeline, a power generation unit comprises a cooling heat exchanger and the fuel cell, a cooling loop is arranged between the secondary side of the cooling heat exchanger and the fuel cell, and the fuel cell is connected with the cooling loop. A primary side inlet of the cooling heat exchanger is connected with the LNG storage tank through a BOG pipeline, a primary side outlet of the cooling heat exchanger is connected with a gas inlet of the fuel cell through a fuel pipeline, electric energy generated by the fuel cell is merged into a user electric power internal network, and the system has the advantages of being good in stability and high in safety.

The invention discloses an ultralow-temperature cascade refrigeration device, belongs to the technical field of refrigeration devices, and solves the problems that when a low-temperature screw compressor continuously operates below-80 DEG C, organic acid generated by hydrolysis of trace moisture and ester lubricating oil and metal chips form colloidal deposition, the resistance of a slide valve is increased, displacement lag is caused, and the service life of the slide valve is prolonged. However, the sensor only feeds back an instruction signal and cannot be monitored by a control system, and finally bearing wear or energy efficiency reduction is caused. Comprising a screw compressor and a slide valve state monitoring circuit arranged in the screw compressor. The actual displacement of the slide valve is measured in real time through double-frequency laser interference, the thickness of jelly is analyzed in combination with acoustic surface wave frequency shift, the fault index is calculated after dynamic compensation, early warning is conducted when the limit is exceeded, a blind area of a traditional sensor is eliminated, diagnosis is conducted in advance, and compressor bearing abrasion is avoided.

The invention discloses a test box for simulating an environment. The test box comprises a box body, a single-stage refrigeration system, a cascade refrigeration system, an environment monitoring system and a control system. The box body comprises a testing space and a working space which are communicated, and the testing space is used for placing a to-be-tested product; the environment monitoring system is used for monitoring the temperature and humidity in the test space; when a first extreme environment of a to-be-tested product is simulated and tested, a control system firstly controls a single-stage refrigeration system to be started and a cascade refrigeration system to be closed, so that the temperature and humidity in a test space reach an intermediate critical environment; and then the control system controls the single-stage refrigeration system to be closed and the cascade refrigeration system to be started, so that the temperature and the humidity in the test space are reduced to the first extreme environment from the intermediate critical environment. According to the scheme, on the basis that the gas environment is not changed, simulation of the extreme environment can be achieved without external connection of other devices, the requirements of the to-be-tested product during environment testing are met, and the testing complexity and the testing cost are reduced.

The invention relates to the technical field of sample storage, particularly provides a cascade refrigeration system and a control method of an ultralow-temperature sample library, and aims to solve the problem that normal operation of a unit is affected due to abnormal oil return of an existing cascade refrigeration system. In order to achieve the purpose, the cascade refrigeration system comprises a high-temperature-stage refrigeration unit, a low-temperature-stage refrigeration unit and an intermediate heat exchanger, the low-temperature-stage refrigeration unit comprises a low-temperature compressor, an oil separation device and a heat exchange device, the oil separation device comprises a plurality of oil separators arranged in sequence, and a heat exchanger is arranged between every two adjacent oil separators; the low-temperature compressor, the oil separation device, the intermediate heat exchanger and the heat exchange device are communicated with one another to form a low-temperature-stage refrigerant circulation loop, and the high-temperature-stage refrigeration unit and the intermediate heat exchanger are communicated with one another to form a high-temperature-stage refrigerant circulation loop. The oil separation efficiency can be improved, deep oil removal is achieved, and oil return is remarkably improved.

The present invention comprises: a first refrigeration cycle that includes a compressor (102), a condenser (103), a first decompressor (104a), and a first evaporator (105a), that causes a refrigerant (FL1) to flow into the first evaporator, and that cools an object 1 to be cooled; and a second refrigeration cycle that includes the compressor, the condenser, a second decompressor (104b), a second evaporator (105b), and an evaporation pressure adjustment valve (108a), that causes a refrigerant (FL2) having a flow rate greater than that in the first decompressor to flow into the second evaporator, and that cools an object 2 to be cooled. The driving of the compressor is controlled on the basis of the temperature (116) of the object 2 to be cooled, which has been cooled, the open-close degree of the first decompressor is controlled on the basis of the superheating degree 1 of the refrigerant downstream (118) of the first evaporator, the open-close degree of the second decompressor is controlled on the basis of the superheating degree 2 of the refrigerant downstream (119) of the second evaporator, and the open-close degree of the evaporation pressure adjustment valve is controlled on the basis of the target pressure for the refrigerant on the downstream side (120) of the evaporation pressure adjustment valve or the temperature (117) of the object 1 to be cooled, which has been cooled by the first evaporator.

The invention relates to the technical field of cascade units, in particular to a defrosting control method of a cascade unit and the cascade unit, and the defrosting control method of the cascade unit comprises a frequency control mode and / or an opening degree control mode. The frequency control mode comprises the steps that the high-temperature-stage condensation saturation temperature T1 and the high-temperature-stage heat exchanger return water temperature T2 are detected, the defrosting frequency F is calculated, F = A * T1-B * T2, 1.2 Hz / DEG C < = A < = 1.8 Hz / DEG C and 0.2 Hz / DEG C < = B < = 0.8 Hz / DEG C are met, and the frequency of the low-temperature-stage compressor is adjusted according to the defrosting frequency. The opening degree control mode comprises the steps that the low-temperature-level high-pressure saturation temperature T3 and the upstream temperature T4 of the downstream of the low-temperature-level main valve are detected, when T3-T4 is smaller than or equal to 0 DEG C, the opening degree of the low-temperature-level main valve is adjusted to be small every first preset duration t1, when T3-T4 is larger than 0 DEG C and smaller than or equal to 1 DEG C, the opening degree of the low-temperature-level main valve is adjusted to be small every second preset duration t2, and when T3-T4 is larger than 1 DEG C, the opening degree of the low-temperature-level main valve is not changed.

The invention discloses a cascade refrigeration system flow control method and device, refrigeration equipment and a medium, a cascade refrigeration system comprises a low-temperature-stage compressor, a high-temperature-stage compressor, an intermediate heat exchanger, a temperature sensor, a condensation fan and a cooling rate sensor, and the temperature sensor is arranged in the intermediate heat exchanger. The real-time temperature monitored by the temperature sensor is synchronously obtained, and the operation duration of the low-temperature-stage compressor is recorded; the operation state of the low-temperature-stage compressor is judged according to the real-time temperature and the operation duration; and if the low-temperature compressor is in the low-flow operation state, a low-flow response mode is started. The flow condition of the low-temperature compressor during starting is judged according to the temperature detected by the temperature sensor and the calculated instantaneous cooling rate, and flow control is performed according to the instantaneous cooling rate, so that the problems of low refrigerant flow and slow cooling rate caused by liquid accumulation in the intermediate heat exchanger during starting of the low-temperature compressor are solved.

A heat pump system is provided. The heat pump system includes a first compressor and a second compressor and a first heat exchanger, a second heat exchanger, and a third heat exchanger. The system further includes a first expansion device, a second expansion device, and a third expansion device. When the system operates in a cascade heating mode, the third heat exchanger is configured to: receive a first portion of refrigerant from the first compressor and a second portion of refrigerant from the second compressor, and provide a first consistent flow of refrigerant to the first compressor and a second consistent flow of refrigerant to the second compressor so as to improve an efficiency of the system.

An assembly includes a fluid conditioning system including a cascade module and an active charge compensator integrated into the fluid conditioning system. The fluid conditioning system is transformable between a first mode and a second mode. In the first mode, the fluid conditioning system includes a first vapor compression loop and a second vapor compression loop. The first vapor compression loop and the second vapor compression loop are thermally coupled at the cascade module and the second vapor compression loop is fluidly separate from the first vapor compression loop. In the second mode, the fluid conditioning system includes a single vapor compression loop. The active charge compensator is operable to control a working fluid charge within the fluid conditioning system based on the mode of operation selected from the plurality of modes.

The invention relates to the technical field of water chilling unit control, in particular to a multi-connected control system for a low-temperature cascade water chilling unit. The system comprises a data acquisition module used for acquiring historical and real-time refrigeration parameter sequences; the refrigeration demand analysis module screens an abnormal period based on the volatility of different period parameter sequences, and calculates a historical refrigeration demand degree in combination with normal period data; the adjustment degree analysis module identifies abnormal units through parameter deviation and gives an alarm, non-abnormal units are sorted according to the parameter deviation degree to generate a demand sequence, and the pressure adjustment degree of the units is dynamically calculated in combination with liquid level distribution; and the adjustment control module performs pressure control on the unit according to the demand sequence and the pressure adjustment degree. According to the method, the historical data and the real-time parameters are fused, the abnormity is responded in time, the unit pressure is dynamically adjusted, the influence of the abnormal unit on the cooperative operation stability of the multiple units under the complex condition is reduced, and the refrigeration effect of the low-temperature refrigeration system meets the high reliability requirement.

Cascaded Cold Climate Heat Pump systems (“CCCHP”) and methods are disclosed. A CCCHP provides efficiency improvements over traditional heat pump systems by utilizing a connected cascaded circuit configuration, to apportion compressor load of a heat pump circuit between two or more circuits. One embodiment that allows the CCCHP to achieve this efficiency improvement includes connecting multiple cold climate heat pump circuits through an intermediary heat exchange unit in a cascaded configuration, where energy is displaced from one refrigerant flow of a circuit into the refrigerant flow of another circuit. This allows each circuit to deploy a smaller compressor that operates within a narrower pressure and temperature range, than it otherwise would if it utilized a single larger compressor in a single circuit operating within a larger pressure range, which has a larger pressure differential between its initial state and its desired state causing inefficiency in the system.

A method and apparatus for controlling compressors in a cascade vapor compression system. The process may include controlling the operation of a first compressor based on a constant band control, and controlling the operation of a second compressor based on a proportional band control. Controlling the first compressor based on the constant band control may include operating the compressor at a constant setting if first measurements are within a range associated with a first setpoint. It may also include proportionally adjusting the operation of the first compressor if the first measurements are outside the range. Further, controlling the second compressor based on the proportional band control may include operating the compressor based on one of a plurality of proportional bands, each proportional band having a different proportional factor. Controlling the second compressor operation may further include switching between these proportional bands based on a second measured parameter.

The invention discloses an assembly type pressure-bearing refrigeration system, and particularly relates to the technical field of refrigeration equipment, the assembly type pressure-bearing refrigeration system comprises a container and a combined type refrigeration cycle unit integrated in the container, and the combined type refrigeration cycle unit comprises a low-temperature-stage refrigeration cycle assembly and a high-temperature-stage refrigeration cycle assembly; the low-temperature-stage refrigeration cycle assembly comprises a pressure-bearing liquid storage tank, and the bottom of the pressure-bearing liquid storage tank is fixedly communicated with a refrigerant liquid outlet. Through high-temperature-stage and low-temperature-stage double-circulation collaborative design and a safe pressure control mechanism, the technical bottleneck of a traditional refrigerating system is broken through, the contradiction that low temperature and safety of traditional high-pressure refrigerating equipment cannot be considered at the same time is solved, stable and safe operation at the ultralow temperature ranging from-20 DEG C to-30 DEG C is achieved, and the refrigerating efficiency is improved. Ultralow-temperature refrigeration is achieved through pressure bearing and high-temperature-level and low-temperature-level double-circulation cooling, so that larger-area refrigeration is achieved through lower temperature, modularized integration of the whole system is achieved through a container, and the adaptive pain point that a traditional refrigeration system is fixedly installed and cannot be moved is solved.

A system includes a pressure exchanger (PX). The PX is coupled to a motor that controls an operating speed of the PX. The system further includes a condenser. An outlet of the condenser is fluidly coupled to a first inlet of the PX. The system further includes a pressure gauge. The pressure gauge is configured to provide first pressure data. The first pressure data is indicative of a pressure of a fluid of the condenser. The system further includes a first controller configured to cause the motor to adjust the operating speed of the PX. The first controller causes the motor to adjust the operating speed of the PX based on the first pressure data.

A compressed air energy storage device is provided with: a compressor that is driven by an electric motor and compresses air; a first heat exchanger that heats the heat storage medium by heat exchange with the compressed air compressed by the compressor; a pressure storage tank for storing the compressed air subjected to heat exchange by the first heat exchanger; an expansion machine driven by the compressed air stored in the pressure accumulation tank; a generator driven by the expander; a second heat exchanger that heats compressed air flowing into the expander by exchanging heat with the heat storage medium heated by the first heat exchanger; and a heat pump device for absorbing heat from the heat storage medium after heat exchange by the second heat exchanger and dissipating heat to compressed air that drives the expander.

The invention discloses a cascade refrigerating system and a control method thereof.The cascade refrigerating system comprises a first-stage refrigerating system and a second-stage refrigerating system, the first-stage refrigerating system comprises a first-stage compressor, a dual-system plate heat exchanger, a first-stage throttling mechanism and an evaporative condenser, and the first-stage compressor, the dual-system plate heat exchanger, the first-stage throttling mechanism and the evaporative condenser are connected through pipelines and form a loop; the second-stage refrigerating system comprises a second-stage compressor, a dual-system plate heat exchanger, an evaporative condenser, a temperature adjusting module and an evaporator which are connected through a pipeline and form a loop; the first-stage refrigerating system and the second-stage refrigerating system share the evaporative condenser and the dual-system plate heat exchanger; an inlet of the evaporator is connected with an outlet of the evaporative condenser and an outlet of the oil separator through the temperature adjusting module. An outlet of the evaporator is connected with an air return port of the second-stage compressor, an outlet of the oil separator and an outlet of the evaporative condenser through the temperature adjusting module. According to the invention, the reliability of the cascade refrigeration system and the temperature uniformity of the evaporator are improved.

A refrigeration cycle apparatus includes a first circuit, a second circuit, a cascade heat exchanger, and a control unit. The first circuit circulates a first refrigerant. The second circuit circulates a carbon dioxide refrigerant and refrigerating machine oil. The cascade heat exchanger heats carbon dioxide refrigerant with first refrigerant. The second circuit includes a second compressor and a container. The container is provided on suction side of the second compressor. The container stores the carbon dioxide refrigerant and the refrigerating machine oil. The control unit controls the operation of the first circuit so that the temperature or pressure of the carbon dioxide refrigerant and the refrigerating machine oil in the container is equal to or higher than a predetermined temperature or predetermined pressure corresponding to a boundary temperature at which the density of the carbon dioxide refrigerant and the density of the refrigerating machine oil in the container become equal.

The invention discloses a wide-temperature-range cascade heat pump system, a control method thereof and a lubricating oil system, and relates to the technical field of heat pump systems, in particular to the wide-temperature-range cascade heat pump system which comprises a low-temperature-section circulation subsystem and a high-temperature-section circulation subsystem. The low-temperature section circulation subsystem comprises a low-temperature section evaporator, a low-temperature section compressor, a low-temperature section condenser and a cascade heat exchanger; the high-temperature section circulation subsystem comprises a high-temperature section evaporator, a high-temperature section compressor and a high-temperature section condenser; according to the scheme provided by the invention, the energy consumption can be reduced, the carbon emission is reduced, and the reliability and operation efficiency of equipment are improved.

The present invention discloses an energy storage type high-temperature heat pump steam generation system, which includes a cascade high-temperature heat pump module, a phase change heat storage module and a steam generation module. The cascade high-temperature heat pump module includes a first closed circulation loop formed by connecting in series an air source evaporator, a low-stage compressor, a low-stage electronic expansion valve and the low-temperature side of an inter-stage heat exchanger, and a second closed circulation loop formed by connecting in series a high-stage compressor, a condenser, a high-stage electronic expansion valve and the high-temperature side of the inter-stage heat exchanger; the phase change heat storage module includes a heat storage tank, a heat storage working medium, a heat exchange tube, a first three-way valve, a second three-way valve and a high-temperature circulation pump; the steam generation module includes a flash tank and a steam compressor. By adopting the above technical solution, during the valley electricity period, low-cost electric energy and environmental heat energy are fully utilized for heat charging and energy storage; during the peak electricity period, the stored heat energy is released for steam production, achieving the maximization of economic benefits. The present invention also provides a control method for the energy storage type high-temperature heat pump steam generation system.

The utility model relates to the technical field of air conditioner heat pumps, in particular to an air source cascade heat pump unit with supercooling and heat recovery, which comprises a cascade heat pump circulation system consisting of a low-temperature-stage refrigeration cycle unit and a high-temperature-stage refrigeration cycle unit, the low-temperature-stage refrigeration cycle unit comprises an air cooling evaporator, a low-temperature-stage compressor, a condensation evaporator and an economizer which are sequentially connected through pipelines and form a first refrigerant circulation loop. The low-temperature-stage refrigeration cycle unit and the high-temperature-stage refrigeration cycle unit are adopted to form the cascade heat pump cycle system with regenerative heat recovery and supercooling, so that the cascade heat pump cycle system is environment-friendly and energy-saving, and meets the existing policy requirements of energy conservation and environmental protection. The whole unit operation process is novel, the low-temperature use range of the air source heat pump unit is widened, the outlet temperature of a heat source of the air source heat pump unit is increased, and meanwhile the comprehensive operation efficiency of the unit is greatly improved.

The disclosure relates to a method (500) for controlling a decentralized heat pump system (100). The system (100) comprising: a first set (110) of one or more heat pump modules; and one or more second sets (120a-c) of one or more heat pump modules (121, 122, 123, 124); the method (500) 5 comprising: determining (S502) at least one of an outdoor temperature, and data pertaining to an electric grid status of an electric grid (150, 160a-c), determining (S504), based on at least one of said outdoor temperature, and said data pertaining to the electric grid status, and, optionally, a specification of the system (100): an ambient side fluid recirculation loop temperature set 10 point of a working fluid of an ambient side fluid recirculation loop (102); detecting (S506) a temperature of the working fluid of the fluid recirculation loop (102); and controlling (S508) an operation of the first set (110) to adjust the first working temperature of the working fluid of the fluid recirculation loop (102) to match said ambient side fluid recirculation loop temperature set point.