39 results about "Refrigerant distribution" patented technology

This invention relates to the field of air conditioning technology and discloses a low-noise, low-energy-consumption dual-compressor refrigeration system. It replaces a single high-power compressor with two low-power compressors, with the two low-power compressors having a higher capacity than a single high-power compressor. While maintaining the same power requirement, the system reduces its size and weight through a ring-shaped fixed weight-reduction method, further reducing compressor vibration and noise. Based on the actual low cooling / heating demand, the operating power of the two compressors is proportionally controlled to minimize energy consumption. Especially during battery thermal management, the low-power compressor provides power, further avoiding frequent compressor starts and reducing energy consumption during low-power operation, thus providing better energy efficiency for the entire vehicle. The evaporator is arranged on both sides of the condenser. With dual compressors, the air conditioning system is adjusted from a single circuit to two independent circuits, thus avoiding uneven refrigerant distribution and significant perceived temperature differences between the left and right sides.

The embodiment of the utility model discloses a refrigerant heater. The refrigerant heater comprises a snakelike flat pipe, the snakelike flat pipe comprises a plurality of U-shaped bent parts and a plurality of flat pipe sections arranged in parallel in the first direction, and the flat pipe sections are connected through the U-shaped bent parts to form a continuous flow channel; at least two flat tube runners are arranged in the snakelike flat tube; the flat pipe flow channels are arranged in parallel in the second direction and are used for refrigerant circulation; wherein the first direction is perpendicular to the second direction; and the at least one heating sheet is arranged between the adjacent flat pipe sections. According to the embodiment of the utility model, the problem that the existing energy storage battery pack lacks a small refrigerant heater which is not in direct contact with a refrigerant is solved, and meanwhile, the problem of dry burning caused by non-uniform refrigerant distribution is avoided.

This invention relates to the field of air conditioning technology, specifically providing an air conditioning system and its control method, which at least solves the problem of uneven refrigerant distribution among outdoor units in existing multi-split outdoor unit air conditioning systems. The air conditioning system includes indoor units and outdoor units, with each outdoor unit comprising multiple outdoor units connected in parallel. The control method includes: acquiring the current low-pressure and current subcooling of each outdoor unit; comparing the current low-pressure of each outdoor unit with a corresponding first preset pressure threshold, and comparing the current subcooling of each outdoor unit with a corresponding first preset subcooling threshold, wherein the first preset pressure threshold is determined based on the current low-pressure of the remaining outdoor units, and the first preset subcooling threshold is determined based on the current subcooling of the remaining outdoor units; based on the comparison results, determining whether each outdoor unit is short of refrigerant, and executing a corresponding refrigerant distribution strategy according to the determination result. This invention is beneficial for promoting a balanced distribution of refrigerant flow among the outdoor units.

The utility model discloses a kind of mixers for heat pump plate evaporator, including mixer main body, including connecting section, mixing section and rectifier section, the passage inside mixing section includes tapering speed-increasing section, arc throat section and gradual expansion pressure-increasing section;At least two spiral grooves are provided on tapering speed-increasing section, at least one spiral groove starts from the lower edge of the inlet and terminates at the upper edge of the outlet, and at least one spiral groove starts from the upper edge of the inlet and terminates at the lower edge of the outlet;The ratio of the length and the inner diameter of rectifier section is 3~5.The utility model can make gas-liquid two-phase in refrigerant uniformly mixed by tapering structure speed-increasing section tapering structure speed-increasing section and cooperate with the rotational flow shear of spiral groove;Meanwhile, by the cooperation of gradual expansion pressure-increasing section and rectifier section, the fluid radial force can be eliminated, to output flow state stable and two-phase distribution uniform refrigerant fluid, thereby improve the uniformity of refrigerant distribution between each passage of evaporator, improve heat exchange energy efficiency.

The invention provides a refrigerating system evaporator direct expansion liquid supply separation type liquid separation device, and relates to the field of refrigerant liquid separation devices.The refrigerating system evaporator direct expansion liquid supply separation type liquid separation device comprises a gas-liquid separation tank, a mixed liquid inlet main pipe, a gas-liquid remixing device and a hydrocyclone, a sealing top cover is welded to the top of the gas-liquid separation tank, the mixed liquid inlet main pipe is connected to the sealing top cover, and the gas-liquid remixing device is connected to the hydrocyclone; the mixed liquid inlet main pipe penetrates through the sealing top cover; a plurality of liquid outlets are formed in the peripheral surface of the lower end of the mixed liquid inlet main pipe; and a gas-liquid remixing device is mounted at the bottom of the gas-liquid separation tank. By arranging the gas-liquid separation tank, the mixed liquid inlet main pipe and the gas-liquid remixing device, after gas-liquid two-phase mixed fluid enters the gas-liquid separation tank, gas and liquid in the tank are completely separated, then the gas and the liquid in all the outlet pipes are evenly led out and mixed through the gas-liquid remixing device, and therefore the gas-liquid separation effect is improved. The gas-liquid two-phase refrigerant is stably, effectively and equivalently distributed to all the evaporation heat exchange pipelines, so that all the evaporation heat exchange pipelines fully play a role in refrigeration.

The application belongs to the field of refrigeration technology and equipment, and particularly relates to a header assembly and application thereof. The existing micro-channel heat exchanger is not uniformly distributed with refrigerant. The application provides a header assembly, which comprises a head, a first header, a rotatable orifice plate and a second header connected in sequence, and an inner insert is arranged in the first header. The inner insert comprises a hollow pipe, the hollow pipe is communicated with the rotatable orifice plate through a partition plate, a plurality of independent cavities are arranged outside the hollow pipe, the independent cavities are communicated with micro-channel flat tubes, the number of the independent cavities is the same as that of the micro-channel flat tubes, the plurality of independent cavities are arranged in the first header, and each independent cavity is communicated with the first header. Two-phase refrigerant enters the rotatable orifice plate from the second header, and gas-liquid gradually mixes and flows. The uniformly mixed refrigerant enters the independent cavities after colliding with the head in the hollow pipe, and then enters the micro-channel flat tubes. The influence of gravity and phase separation is eliminated, and uniform distribution can be realized under different working conditions throughout the year.

A vehicular heat management system configured to adjust the amount of refrigerant distributed to an outdoor heat exchanger and a chiller depending an air conditioning conditions in a heat pump mode is disclosed, which allows reduction of unnecessary refrigerant flow path resistance and pressure loss due to distribution of refrigerant to an unnecessary part and resultant decrease in heat pump performance by limiting the distribution of the refrigerant to an unnecessary part among the outdoor heat exchanger and the chiller depending on the conditions. The system includes: a heat pump type refrigerant circulation line including a compressor, a high pressure side heat exchanger, and an outdoor heat exchanger and a chiller connected in parallel to each other; and a refrigerant distribution amount control part configured to control an amount of refrigerant distributed to the outdoor heat exchanger and the chiller according to air conditioning conditions in a heat pump mode.

The utility model discloses a heat exchange system relates to according to center heat dissipation technical field, including refrigerant distribution subassembly and with refrigerant distribution subassembly intercommunication's multiple liquid cooling subassembly, and refrigerant distribution subassembly is used for to each liquid cooling subassembly delivery coolant, and liquid cooling subassembly is used for cooling heat source equipment, and refrigerant distribution subassembly includes liquid distribution pipe and collecting liquid pipe, and is provided with a plurality of exports on liquid distribution pipe, and every export is connected with the entrance of a liquid cooling subassembly, and is provided with a plurality of inlets on collecting liquid pipe, and every inlet is connected with the export of a liquid cooling subassembly, and multiple temperature control components are set up one to one with multiple liquid cooling subassembly, and temperature control component sets up between liquid cooling subassembly and the corresponding inlet on collecting liquid pipe, and temperature control component is used for controlling the on-off of the passage between liquid cooling subassembly and the corresponding inlet on collecting liquid pipe.

A rotational turbine diffuser for cryogenic ablation includes a non-rotating discharge core having an external portion at the distal end and an internal portion that is fluidly coupled to a delivery tube by a lumen at the proximal end to receive refrigerant, and to distribute refrigerant via internal pathways to, a rotating discharge diffuser having an annular cavity for conducting refrigerant to a plurality of orifices in the rotating discharge diffuser, that dispense refrigerant radially outward in a stream, causing the discharge diffuser to rotate about the internal portion of the discharge core, thereby broadcasting the refrigerant onto an inner surface of the balloon in a 360 degree discharge pattern, a discharge cover covering the discharge diffuser having corresponding orifices forming viaways for the refrigerant, and a proximal retainer fixedly mounted to the discharge core on the proximal end securing the discharge diffuser and discharge cover.

A method for manufacturing a distributor for refrigerant in components in a thermal management module is provided, distributor has distributor openings for the refrigerant on an upper surface and / or a lower surface that faces away from the upper surface. Greater reliability, reduced installation space, and greater variability in the shape of the distributor are obtained in that the distributor is produced in a casting process, in which channel sections of channels passing through the distributor are obtained with a removable core in a mold. A method for manufacturing a thermal management module that contains such a distributor, as well as a distributor produced in this manner, and a thermal management module is provided.

This invention discloses a control method for a vehicle air conditioning system. Based on the deviation between the target and actual outlet air temperature of the front air conditioning assembly, the compressor speed is adjusted to change the condenser outlet subcooling, thus bringing the actual outlet air temperature of the front air conditioning assembly closer to the target outlet air temperature. Based on the deviation between the target and actual outlet air temperature of the rear air conditioning assembly, the opening of the electronic expansion valve is adjusted to change the refrigerant distribution ratio, thus bringing the actual outlet air temperature of the rear air conditioning assembly closer to the target outlet air temperature. This control method, by linking the outlet air temperature control of the front air conditioning assembly to the condenser subcooling and the outlet air temperature control of the rear air conditioning assembly to the opening of the electronic expansion valve, decouples the direct competition between the front and rear air conditioning systems for refrigerant distribution from a control logic perspective. This can improve the mutual disturbance of outlet air temperatures between the front and rear air conditioning systems and enhance the uniformity of refrigerant distribution in the evaporators of both systems. This invention also discloses a vehicle air conditioning system and a vehicle.

The application discloses a vapor compression refrigeration system and a variable load control method, characterized by comprising a falling film evaporator, a cylinder body, a refrigerant inlet, a liquid discharge port and a gas outlet arranged on the cylinder body, the gas outlet being communicated with a compressor gas inlet; a condenser gas inlet being communicated with a compressor gas outlet; an evaporator refrigerant inlet being located at the top of the cylinder body, a refrigerant distributor and a heat exchange pipe group being further arranged below the refrigerant inlet; an expander, an expander liquid inlet and an expander refrigerant outlet being arranged, the expander liquid inlet being communicated with the condenser liquid outlet, and the expander refrigerant outlet being communicated with the falling film evaporator refrigerant inlet. While improving the heat exchange effect and reducing the refrigerant charging amount, the refrigeration system maintains high-efficiency operation without consuming refrigeration capacity or electric power consumption.

This application discloses an air conditioner, belonging to the field of air handling technology. The air conditioner includes: a distributor comprising: an inlet flow path for refrigerant to flow into; a rectifier flow path extending along the height direction, the bottom of which is connected to the inlet flow path; a first branch flow path having multiple branches connected to the rectifier flow path; a second branch flow path having multiple branches corresponding one-to-one with the first branch flow path, the lower part of which is connected to a heat exchange tube; a main flow path connecting the lower parts of the first and second branch flow paths; and a bypass flow path connecting the upper parts of the first and second branch flow paths. This air conditioner can solve the problem of poor refrigerant distribution uniformity at the heat exchanger.

This application provides a heat exchanger comprising a body and a distribution section. The body has a refrigerant flow channel, and the distribution section is at least partially located within the heat exchanger. The distribution section has a main refrigerant inlet, an auxiliary refrigerant inlet, a distribution chamber, and a refrigerant outlet. The main refrigerant inlet and the auxiliary refrigerant inlet are connected, and the refrigerant outlet connects the distribution chamber and the refrigerant flow channel. The main and auxiliary refrigerant inlets are located on the same side of the distribution section, and the refrigerant outlet is located on the other side. The flow area of ​​the main refrigerant inlet is larger than that of the auxiliary refrigerant inlet. During operation, the refrigerant can enter the heat exchanger from the main refrigerant inlet and flow to the side near the auxiliary refrigerant inlet, forming a swirling flow, thus improving the mixing uniformity of the refrigerant. The auxiliary refrigerant inlet can supplement the refrigerant distribution at the distribution orifice near the inlet, thereby improving the distribution uniformity of the refrigerant within the distribution chamber. This application achieves refrigerant swirling and refrigerant compensation distribution through two inlets: the main refrigerant inlet and the auxiliary refrigerant inlet, resulting in a relatively simple distribution structure for the heat exchanger.

The utility model belongs to refrigeration equipment technical field especially points to a kind of Y shape three-way pipe fittings for refrigeration equipment, including main pipe body, the main pipe body is the U-shaped bend pipe structure that straight pipe is bent into shape as a whole, the U-shaped bottom of main pipe body is formed by hydraulic outward local deformation and forms protruding portion, the inner diameter of this protruding portion is greater than the inner diameter of main pipe body, and protruding portion and main pipe body between form the spherical surface excess section of smooth connection and present spherical surface bulge structure, the end of protruding portion is formed with the side branch port that is communicated with the inner cavity of main pipe body by cutting, the axis of side branch port coincides with the centre line of main pipe body, and the U-shaped both ends port of main pipe body and side branch port do not coincide in horizontal plane projection. The utility model simple structure, reasonable in design, by adopting spherical surface excess section structure, so that refrigerant can be reasonably guided to carry out laminar uniform bifurcation when flowing into main pipe body from side branch port, eliminate the influence of flow velocity sudden change and can make refrigerant distribution uniform.

The application relates to a condensing device, a control method and a device thereof, wherein a sensor group in the condensing device is used for collecting environmental data, first device state data of the condensing device itself and second device state data of an associated device of the condensing device; an input end of a multi-way distribution valve is communicated with a refrigerant inlet, a first output end is communicated with an air-cooled flow channel, a second output end is communicated with a water-cooled flow channel, and the multi-way distribution valve is used for adjusting a refrigerant flow; an air volume adjusting baffle is used for adjusting air volume; an electronic expansion valve is used for adjusting the flow of cooling water; and a control module is used for determining building cooling load according to the first device state data, and controlling the angle of the air volume adjusting baffle, the refrigerant distribution ratio of the multi-way distribution valve and the opening degree of the electronic expansion valve according to the environmental data, the first device state data, the building cooling load and the second device state data. The application embodiment can switch the best condensing mode according to the actual application scene, so that the overall energy efficiency is improved and the energy consumption is reduced.

This invention relates to the field of air conditioning evaporator technology, and discloses an air conditioning evaporator with a uniform flow distribution structure, including multiple evaporation branches, multiple distributors, a basic liquid distribution pipe, a liquid phase compensation pipe, and a vapor-liquid separator. The vapor-liquid separator separates the throttled gas-liquid two-phase refrigerant into a gas-liquid mixed refrigerant and a liquid-enriched refrigerant, which are then respectively delivered to the basic liquid distribution pipe and the liquid phase compensation pipe. Each distributor is located at the input end of an evaporation branch and contains a flow distribution chamber, a liquid replenishment chamber, and a valve core assembly. The valve core rod has a basic throttling orifice and a liquid replenishment channel. The basic throttling orifice connects the flow distribution chamber and the evaporation branch, forming a throttling pressure difference. Under the action of the throttling pressure difference, the valve core rod overcomes the slippage of the elastic reset element, thereby changing the flow area of ​​the liquid replenishment channel, allowing the liquid-enriched refrigerant in the liquid replenishment chamber to be supplied in parallel with the basic throttling orifice into the corresponding evaporation branch. Liquid phase compensation is performed according to the liquid supply status of each evaporation branch to improve the uniformity of refrigerant distribution.

This invention relates to the field of heat pump control technology, specifically a group control system for air-cooled heat pump units based on temperature and pressure environmental control. The system includes a temperature and pressure monitoring and reconstruction module, a field feature mapping module, a coupled mapping analysis module, a branch distribution coding module, a balanced distribution control module, a deviation discrimination and warning module, and a synchronous coordination calibration module. It performs three-dimensional temperature and pressure monitoring of the entire environment of the air-cooled heat pump unit group, and obtains a temperature and pressure distribution map through filtering and interpolation reconstruction. An environmental disturbance potential energy field is generated through field feature mapping, and then coupled and analyzed with the heat exchange conditions to obtain heat load deviation characteristics. Based on these characteristics, refrigerant distribution branch distribution coding is completed, generating flow redistribution commands. Distribution is adjusted accordingly, and steady-state operating pressure difference is set. A pressure difference deviation warning signal is generated through threshold discrimination, and finally, the operating parameters of individual units are calibrated to achieve synchronous operation of the unit group control. This invention can improve the efficiency of air-cooled heat pump unit group control.

Intelligent refrigerant distribution units for data center cooling systems are disclosed, specifically systems and methods for cooling a data center are disclosed. In at least one embodiment, a refrigerant distribution unit (RDU) distributes a first refrigerant from a refrigerant reservoir to one or more cold plates to extract heat from at least one computing device and also interfaces between a first refrigerant cooling loop having the first refrigerant and a second refrigerant cooling loop such that the second refrigerant cooling loop dissipates at least a portion of such heat to an ambient environment using a second refrigerant through a second condenser unit.

This application proposes a heat exchanger, including a heat exchange tube and a manifold. The manifold has a first cavity, and the heat exchange tube is inserted into the manifold along a first direction. The maximum dimension W1 of the first cavity in a second direction is greater than the maximum dimension L1 of the first cavity in the first direction. The heat exchanger also includes a first plate, a flow guide, and a connecting pipe. At least a portion of the first plate is located within the first cavity, and the first plate divides the first cavity. The first cavity includes a first sub-cavity and a second sub-cavity. The flow guide connects the first sub-cavity and the second sub-cavity, and the connecting pipe connects to the first sub-cavity. A plane perpendicular to the length direction of the manifold is defined as a first plane. The projected area of ​​the portion of the heat exchange tube inserted into the first cavity on the first plane is S1, the projected area of ​​the flow guide on the first plane is S2, and the projected area of ​​the first cavity on the first plane is S, where 2 / 5 ≤ (S1 + S2) / S ≤ 9 / 10. This heat exchanger is beneficial for improving the refrigerant distribution effect and the heat exchange efficiency of the heat exchanger.

This utility model discloses a copper-cased, brass-insulated distributor, relating to the field of distributor technology. The utility model includes a distributor body with a plurality of evenly spaced dispensing holes around its circumference. A shell is threaded onto the outer circumference of the distributor body, and an inlet end with an inlet hole is located at the upper end of the shell. A flow-dividing structure is installed on the distributor body. This utility model utilizes the funnel-shaped design of the inner wall of the dispensing end and the flow-dividing seat, along with a uniformly spiral-designed flow-dividing baffle, to force the refrigerant into a spiral rotational flow after entering the distributor. Centrifugal force is used to achieve uniform circumferential distribution. Combined with the symmetrical circumferential layout of the dispensing holes, this completely eliminates the flow difference caused by abrupt changes in the flow channel in traditional distributors, ensuring uniform refrigerant distribution to the capillary tube and improving the energy efficiency and cooling effect of the refrigeration system.

This application relates to the field of air conditioning equipment technology, and discloses a refrigerant distribution component, a heat exchanger, and an air conditioning system. The refrigerant distribution component includes a manifold and at least two branch pipes. The manifold has a liquid inlet, and the inlets of the at least two branch pipes are respectively connected to and communicate with the manifold. Refrigerant from the liquid inlet flows through the manifold to the outlets of the at least two branch pipes. The at least two branch pipes include a first branch pipe, which has at least two outlets. Because the first branch pipe has at least two outlets, the number of branch pipes connected to the manifold can be reduced, the probability of mutual interference between branch pipes is reduced, the connection between the branch pipes and the manifold is facilitated, and the size of the manifold can be reduced accordingly, thereby reducing the space occupied by the refrigerant distribution component.

This invention relates to the field of air conditioner technology, and discloses a heat collection device for a heat exchanger, a heat exchanger, and an air conditioner. In the heat collection device for the heat exchanger, a liquid equalization section is provided with a straight mating part, which serves as an assembly reference surface to ensure the flatness and fit of the mating surfaces. A corresponding positioning and fastening part is provided in the liquid distribution section, which engages with the straight mating part. Simultaneously, through the fastening connection of the two, a liquid distribution cavity for refrigerant distribution is formed, and a liquid equalization chamber is formed inside the liquid equalization section. The liquid equalization cavity and the liquid distribution cavity are connected through a liquid distribution hole. The engagement of the straight mating part and the positioning and fastening part enables rapid alignment and stable positioning of the two components, limiting their relative displacement and preventing misalignment and deformation during subsequent welding. This improves the welding sealing effect and structural connection stability, achieving a simultaneous improvement in assembly efficiency, connection stability, and functional practicality.

The application discloses a kind of integrated refrigeration system of vehicle-mounted multi-unit and vehicle, it is related to refrigeration system technical field, vehicle-mounted multi-unit at least includes vehicle-mounted cold and warm box and vehicle-mounted beverage machine, integrated refrigeration system includes: compressor, condenser, first refrigeration unit, second refrigeration unit and refrigerant distribution unit, first refrigeration unit acts on vehicle-mounted cold and warm box, and is configured to refrigerate vehicle-mounted cold and warm box to realize refrigeration or freezing function, second refrigeration unit acts on vehicle-mounted beverage machine, and is configured to refrigerate vehicle-mounted beverage machine to extract cold drink, refrigerant distribution unit is also configured to the refrigerant flow that can be distributed into first refrigeration unit and second refrigeration unit flows.According to the integrated refrigeration system of the present application, it is favorable to realize the effect that vehicle-mounted cold and warm box and vehicle-mounted beverage machine share integrated refrigeration system, it is favorable to reduce the space occupation of vehicle-mounted multi-unit, it is favorable to reduce the energy consumption of vehicle, it is favorable to reduce cost.

A heat exchanger, comprising a distribution flow channel, a main inlet, an auxiliary inlet, distribution holes, and refrigerant flow channels. The distribution holes communicate with the distribution flow channels, the distribution holes connect the refrigerant flow channels with the distribution flow channel, and both the main inlet and the auxiliary inlet communicate with the distribution flow channel. The flow area of the main inlet is greater than the flow area of the auxiliary inlet. A plane perpendicular to the axial direction of the distribution flow channel is defined as an auxiliary projection plane, and the projection of the main inlet on the auxiliary projection plane is farther than the projection of the auxiliary inlet on the auxiliary projection plane from the projection of the distribution holes on the auxiliary projection plane. When the heat exchanger is in operation, the mixing uniformity of the refrigerant can be improved, and the uniformity of refrigerant distribution within the distribution chamber can be improved.

This utility model discloses a high-performance, lightweight automotive parallel-flow condenser, belonging to the technical field of automotive air conditioning heat exchangers. The condenser includes a manifold, refrigerant inlet and outlet, multiple rows of flat tubes, corrugated finned windows, upper and lower clamps, an integrated liquid receiver dryer, and mounting clips. The inner wall of the manifold has spiral grooves to guide the refrigerant into a swirling flow, while simultaneously reducing overall weight. The two ends of the flat tubes are flat tube arc surfaces, seamlessly fitting the inner wall of the manifold. The corrugated finned windows are brazed to the flat tubes, increasing the heat exchange area. The liquid receiver dryer is integrated into the top of the right-side manifold, with a built-in dryer core, simplifying the piping structure. The upper and lower clamps are made of aluminum alloy. Through multi-component collaborative design, uniform refrigerant distribution, reduced flow pressure loss, and lightweight structure are achieved, resulting in reduced overall weight and improved heat exchange efficiency. It also enhances vibration resistance and installation reliability, making it suitable for automotive air conditioning systems.

This invention discloses a preheating device and method for pulp production, applicable to long-distance pulp production lines. The device includes a distributed hybrid heat pump unit with dual compressors and three condensers, a waste heat collection loop, a refrigerant distribution and control component, an energy storage bidirectional scheduling component, and a return flow distribution component. The first and second heat pump units correspond to the front and rear sections of the pipeline, respectively, with their condensers serving as front and rear section heat-traced condensers, forming a three-stage heat exchange system in conjunction with an independent intermediate section condenser. The compressor operation is controlled by both the intermediate medium and pulp temperature. Excess refrigerant is diverted to the intermediate section for supplemental heating, and the intermediate section refrigerant is returned to the two units via a pressure adaptive valve group. This device replaces electric heat tracing, solving problems such as large temperature drops in long pipelines, insufficient heat exchange at high flow rates, and low waste heat utilization, achieving full waste heat recovery and reducing energy consumption in the production line.

A refrigeration system includes a distribution system and a refrigeration unit; the distribution system is configured to circulate a refrigerant from the distribution system; the distribution system includes a distribution system pump, a main chiller, a distribution system inlet line, and a distribution system outlet line; the main chiller is configured to receive the distribution system refrigerant from the distribution system pump; the distribution system inlet line is configured to receive the distribution system refrigerant from the main chiller; the distribution system outlet line is configured to receive the distribution system refrigerant from the distribution system inlet line and to supply the distribution system refrigerant to the distribution system pump;The refrigeration unit is configured to circulate a refrigerant from the refrigeration unit; the refrigeration unit includes a refrigeration unit pump, an upstream receiver, a condenser, a downstream receiver, and an evaporator; the upstream receiver is configured to receive the refrigerant from the refrigeration unit.