Central air conditioning system
By employing a tiered configuration of first and second refrigeration units in the central air conditioning system, combined with temperature sensors and three-way valves, chilled water is diverted according to temperature differences, thus solving the energy waste problem caused by the imbalance of return water temperature in multiple floors. This achieves reduced system energy consumption and improves energy utilization efficiency.
Patent Information
- Application Number
- CN202520281354.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-02-21
AI Technical Summary
The energy loss problem caused by the imbalance of return water temperature in central air conditioning systems operating on multiple floors cannot be effectively solved by existing technologies.
The first and second refrigeration units are configured in a layered manner. Combined with temperature sensors and three-way valves, the chilled water is diverted to different refrigeration units according to the temperature difference of the chilled water, so as to avoid mixing of chilled water at different temperatures and use low-energy-consumption refrigeration units to share the high-energy-consumption refrigeration work.
By optimizing the distribution of chilled water, the system's energy consumption was reduced and energy utilization efficiency was improved.
Smart Images
Figure CN223755527U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to central air conditioning chilled water system field especially, relates to a central air conditioning system. BACKGROUND
[0002] Current central air conditioning system in actual operation generally exists the energy loss problem of multi-storey return water temperature imbalance, due to the significant difference of the heat load of different floor space in the building, the heat exchange condition of the environment where each layer cooling device unit is different, leading to the temperature of each branch air conditioning return water is different.
[0003] The above multi-path air conditioning return water will mix air conditioning return water of different temperatures together after forced mixing, leading to the temperature field of mixed water entering the condenser deviates from the best working condition design parameter of the equipment; the compressor needs to additionally increase the operation power to compensate the heat exchange efficiency loss caused by the mixed water temperature rise in order for the refrigeration device to maintain the given cooling efficiency, which increases the operation energy consumption of the refrigeration equipment. UTILITY MODEL CONTENT
[0004] The utility model discloses a central air conditioning system, reduce the operation energy consumption of the system.
[0005] The utility model discloses a central air conditioning system adopts the technical scheme:
[0006] Including first refrigeration device, second refrigeration device and a plurality of cold device, the first refrigeration device's water inlet is connected with first air conditioning return water, the first refrigeration device's water outlet is connected with air conditioning water supply, the second refrigeration device's water outlet is connected with air conditioning water supply, the second refrigeration device's water inlet is connected with second air conditioning return water, the cold device's water inlet is connected with air conditioning water supply, the cold device's water outlet is connected with three -way valve, two ways of the three -way valve are connected with first air conditioning return water and second air conditioning return water respectively, the cold device and three -way valve are connected with regulating valve, and the cold device and three -way valve are equipped with temperature sensor.
[0007] As preferred scheme, the cold device and air conditioning water supply are equipped with pressure sensor.
[0008] As preferred scheme, the second refrigeration device and air conditioning water supply are connected with check valve.
[0009] The utility model discloses a central air conditioning system has the advantages of:
[0010] The system is arranged in a multi-storey building, and each floor is respectively provided with one or more cold using devices according to the space load demand; when in operation, the first refrigeration device converts chilled water in the first air conditioning return water into low-temperature chilled water and injects the low-temperature chilled water into air conditioning water supply, the second refrigeration device converts chilled water in the second air conditioning return water into low-temperature chilled water and injects the low-temperature chilled water into the air conditioning water supply, and the air conditioning water supply sequentially guides the low-temperature chilled water to each cold using device; the low-temperature chilled water absorbs heat when flowing through the cold using device, the chilled water is heated, and the temperature sensor monitors the temperature of the chilled water; when the temperature of the chilled water is low, the regulating valve is closed to reduce the flow of the chilled water flowing through the cold using device; and when the temperature of the chilled water is high, the regulating valve is opened to increase the flow of the chilled water flowing through the cold using device, so that the system can reduce the energy consumption of the system under the condition of ensuring the normal operation of the cold using device.
[0011] The first refrigeration device is a conventional energy consumption device, and the second refrigeration device is a low-energy consumption device; since the chilled water discharged by the cold using device has different temperatures, the temperature of the chilled water is monitored through the temperature sensor, and the chilled water is divided into two kinds according to the temperature of the chilled water; the first kind of chilled water with a higher temperature needs the first refrigeration device to consume more energy to be converted into low-temperature chilled water, and the second kind of chilled water with a lower temperature only needs the second refrigeration device to consume a small amount of energy to be converted into low-temperature chilled water; when the first kind of chilled water with a higher temperature is discharged by the cold using device, the three-way valve is opened to be communicated with the first air conditioning return water, so that the first air conditioning return water guides the first kind of chilled water with a higher temperature into the first refrigeration device; when the second kind of chilled water with a lower temperature is discharged by the cold using device, the three-way valve is opened to be communicated with the second air conditioning return water, so that the second air conditioning return water guides the second kind of chilled water with a lower temperature into the second refrigeration device, the two kinds of chilled water with different temperatures are prevented from being mixed, the first refrigeration device is prevented from being operated under high load, the second refrigeration device is prevented from sharing the refrigeration work of the system, and the energy consumption of the system is further reduced. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the central air conditioning system.
[0013] Figure 2 It is a structural schematic diagram of the cold using device of the central air conditioning system. DETAILED DESCRIPTION
[0014] The utility model makes further elaboration and illustration in combination with specific embodiment and description of drawings:
[0015] Please refer to Figure 1 .
[0016] The utility model discloses a kind of central air conditioning systems, including first refrigeration device 1, second refrigeration device 2 and multiple cold using devices 4.
[0017] The first refrigeration device 1 is preferably a conventional energy consumption device, and the second refrigeration device 2 is a low energy consumption device; the first refrigeration device 1 is communicated with the first air conditioner return water 11 at the water inlet, the first refrigeration device 1 is communicated with the air conditioner water supply 12 at the water outlet, the second refrigeration device 2 is communicated with the air conditioner water supply 12 at the water outlet, and the second refrigeration device 2 is communicated with the second air conditioner return water 21 at the water inlet;
[0018] Further, the second refrigeration device 2 is communicated with the air conditioner water supply 12 at the water outlet through a check valve 211, which can avoid the backflow of chilled water in the air conditioner water supply 12 to the second refrigeration device 2.
[0019] Please refer to Figure 1 and Figure 2 .
[0020] The system is arranged in a multi-storey building, and each floor is respectively configured with a single or multiple cold using devices 4 according to the space load demand; the water inlet of the cold using device 4 is communicated with the air conditioner water supply 12, and multiple cold using devices 4 are connected in parallel on the air conditioner water supply 12; the water outlet of the cold using device 4 is communicated with a three-way valve 41, two of which are respectively communicated with the first air conditioner return water 11 and the second air conditioner return water 21, and the other one is communicated with the water outlet of the cold using device 4; multiple three-way valves 41 are connected in parallel on the first air conditioner return water 11, and multiple three-way valves 41 are connected in parallel on the second air conditioner return water 21;
[0021] Further, the cold using device 4 is communicated with the three-way valve 41 through an adjusting valve 42, which is used to control the water discharge flow of the water outlet of the cold using device 4; a temperature sensor 431 is arranged between the cold using device 4 and the three-way valve 41, which is used to monitor the temperature of the chilled water discharged by the cold using device 4; a pressure sensor 432 is arranged between the water inlet of the cold using device 4 and the air conditioner water supply 12, which monitors the water pressure of the chilled water entering the cold using device 4 to determine whether the water supply pressure value meets the design requirements, so that the adjusting valve 42 can better control the flow;
[0022] Further, a PLC device 43 is arranged on the cold using device 4, multiple PLC devices 43 are electrically connected in parallel, the adjusting valve 42, the three-way valve 41, the temperature sensor 431 and the pressure sensor 432 are electrically connected with the PLC device 43, the temperature sensor 431 and the pressure sensor 432 transmit the monitored data to the PLC device 43, and the PLC device 43 controls the operation of the adjusting valve 42 and the three-way valve 41.
[0023] When running, the first refrigeration device 1 and the second refrigeration device 2 inject low-temperature chilled water into the air conditioning water supply 12, and the air conditioning water supply 12 guides the low-temperature chilled water to each cold-using device 4 in turn; the low-temperature chilled water absorbs heat when flowing through the cold-using device 4, the chilled water is warmed, the temperature of the chilled water is monitored by using the temperature sensor 431, and the monitored temperature data is transmitted to the PLC device 43; when the temperature of the chilled water is low, the PLC device 43 controls the regulating valve 42 to be small, thereby reducing the flow of the chilled water flowing through the cold-using device 4, and when the temperature of the chilled water is high, the PLC device 43 controls the regulating valve 42 to be large, thereby increasing the flow of the chilled water flowing through the cold-using device 4, so that the cold-using device 4 can efficiently utilize the chilled water, avoid waste, and enable the system to reduce the energy consumption of the system while ensuring the normal operation of the cold-using device 4.
[0024] Since the chilled water needs to overcome resistance when reaching and flowing through the cold-using device 4, in order to ensure that the chilled water supply pressure of the layer is stable, the pressure sensor 432 is used to monitor the pressure value, and the opening degree of the regulating valve 42 is controlled by the PLC device 43 to avoid the opening degree being too small, so as to maintain the chilled water pressure not less than the set value.
[0025] At this time, the temperature of the chilled water is monitored by using the temperature sensor 431, and the chilled water is divided into two kinds according to the temperature of the chilled water, the first kind of chilled water with a higher temperature needs the first refrigeration device 1 to consume more energy to be converted into low-temperature chilled water, and the second kind of chilled water with a lower temperature only needs the second refrigeration device 2 to consume a small amount of energy to be converted into low-temperature chilled water.
[0026] When the cold-using device 4 discharges the first kind of chilled water with a higher temperature, the three-way valve 41 opens the communication between the cold-using device 4 and the first air conditioning return water 11, so that the first air conditioning return water 11 guides the first kind of chilled water with a higher temperature into the first refrigeration device 1, and the first refrigeration device 1 with conventional energy consumption converts the first kind of chilled water with a higher temperature into low-temperature chilled water.
[0027] When the cold-using device 4 discharges the second kind of chilled water with a lower temperature, the three-way valve 41 opens the communication between the cold-using device 4 and the second air conditioning return water 21, so that the second air conditioning return water 21 guides the second kind of chilled water with a lower temperature into the second refrigeration device 2, and the second refrigeration device 2 with low energy consumption converts the second kind of chilled water with a lower temperature into low-temperature chilled water; thereby avoiding the mixing of the two kinds of chilled water with different temperatures, avoiding the high-load operation of the first refrigeration device 1, enabling the second refrigeration device 2 to share the refrigeration work of the system, and further reducing the energy consumption of the system.
[0028] The utility model provides a central air conditioning system, will be arranged in each floor respectively with cold device more, when running, first refrigeration plant will convert the chilled water in first air conditioning return water into low temperature chilled water and inject into air conditioning water supply, second refrigeration plant will convert the chilled water in second air conditioning return water into low temperature chilled water and inject into air conditioning water supply, and air conditioning water supply will low temperature chilled water be guided to each cold device in turn, low temperature chilled water absorbs heat when flowing through the cold device, and the chilled water temperature rises, temperature sensor monitors the temperature of chilled water, when the temperature of chilled water is low, the regulating valve is closed, thereby reducing the flow of chilled water flowing through the cold device, when the temperature of chilled water is high, the regulating valve is opened, thereby increasing the flow of chilled water flowing through the cold device, so that the system can reduce the energy consumption of the system under the condition of guaranteeing the normal operation of the cold device,
[0029] The first refrigeration plant is a conventional energy consumption equipment, and the second refrigeration plant is a low energy consumption equipment, because the chilled water discharged by the cold device has different temperatures, the temperature of the chilled water is monitored through the temperature sensor, and the chilled water is divided into two kinds according to the temperature of the chilled water, the first kind of chilled water with a higher temperature needs the first refrigeration plant to consume more energy to be converted into low temperature chilled water, and the second kind of chilled water with a lower temperature only needs the second refrigeration plant to consume a small amount of energy to be converted into low temperature chilled water, when the first kind of chilled water with a higher temperature is discharged by the cold device, the three-way valve is opened to communicate with the first air conditioning return water, so that the first air conditioning return water guides the first kind of chilled water with a higher temperature into the first refrigeration plant, when the second kind of chilled water with a lower temperature is discharged by the cold device, the three-way valve is opened to communicate with the second air conditioning return water, so that the second air conditioning return water guides the second kind of chilled water with a lower temperature into the second refrigeration plant, avoiding the mixing of the chilled water with different temperatures, avoiding the high load operation of the first refrigeration plant, letting the second refrigeration plant share the refrigeration work of the system, and further reducing the energy consumption of the system.
[0030] Finally, it should be noted that the above examples are used to illustrate the technical solutions of the utility model, and are not limited to the scope of protection of the utility model, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the utility model.
Claims
1. A central air conditioning system, characterized by, The system comprises a first refrigeration device, a second refrigeration device and a plurality of cold-using devices; The water inlet of the first refrigeration device is communicated with first air conditioner return water, the water outlet of the first refrigeration device is communicated with air conditioner water supply, the water outlet of the second refrigeration device is communicated with air conditioner water supply, and the water inlet of the second refrigeration device is communicated with second air conditioner return water; The water inlet of the cold-using device is communicated with air conditioner water supply, a three-way valve is communicated with the water outlet of the cold-using device, two ways of the three-way valve are respectively communicated with the first air conditioner return water and the second air conditioner return water, a regulating valve is communicated between the cold-using device and the three-way valve, and a temperature sensor is arranged between the cold-using device and the three-way valve.
2. A central air conditioning system as claimed in claim 1, wherein, A pressure sensor is arranged between the cold-using device and the air conditioner water supply.
3. A central air conditioning system as claimed in claim 2, wherein, A check valve is communicated between the second refrigeration device and the air conditioner water supply.