A cold and heat source water supply unit suitable for different seasons and a control method thereof

Abstract

The application provides a cold and heat source water supply unit suitable for different seasons and a control method thereof. A return water end is connected with a water supply end through a pipe group. The pipe group is respectively provided with a first heat exchange pipeline, a second heat exchange pipeline, a third heat exchange pipeline and a fourth heat exchange pipeline. A waste water heat exchange assembly is arranged on the first heat exchange pipeline. A boiler heat exchange assembly is arranged on the second heat exchange pipeline. A ground cooling heat exchange assembly is arranged on the third heat exchange pipeline. A mechanical refrigeration heat exchange assembly is arranged on the fourth heat exchange pipeline. The water supply unit is centrally controlled through a control system. Through the fusion of cloud climate data and local sensors, precise seasonal mode switching is realized. Through a PID algorithm, hierarchical control and an energy efficiency database, energy consumption is effectively reduced. The pump frequency can be adjusted in combination with the peak and valley electricity price of the power grid to reduce the operation cost. The local historical data backup and standby pipeline switching function are provided to ensure the continuous operation of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to a cold and heat source water supply unit suitable for different seasons and a control method thereof. BACKGROUND

[0002] The conventional cold and heat source water supply system usually adopts a single heat source or cold source, which has the following problems:

[0003] 1. Poor season adaptability: manual switching of system mode is required in winter and summer, which is low in efficiency and prone to errors;

[0004] 2. Energy waste: a single heat / cold source is difficult to meet the load demand in extreme weather, and needs to be operated at full load for a long time;

[0005] 3. Rough control: relying on manual experience adjustment, unable to dynamically respond to climate change and peak-valley electricity price;

[0006] 4. Resources are not reused: potential energy such as waste heat and ground cooling is not effectively utilized.

[0007] In the prior art, although there are heat exchange systems designed for different seasons, there is a lack of multi-source collaborative control, cloud data driving and intelligent optimization algorithm, which leads to limited energy efficiency improvement. Therefore, there is an urgent need for a cold and heat source water supply system integrating multi-source complementation, intelligent regulation and control and abnormal processing functions. SUMMARY

[0008] The purpose of the present application is to provide a cold and heat source water supply unit suitable for different seasons and a control method thereof to solve the problems existing in the prior art.

[0009] To achieve the above purpose, the present application provides the following solutions:

[0010] The present application provides a cold and heat source water supply unit suitable for different seasons, which comprises a water supply end and a return water end, the return water end is connected with the water supply end through a pipe group, and a main drive pump is arranged on the pipe group, the pipe group is respectively provided with a first heat exchange pipeline, a second heat exchange pipeline, a third heat exchange pipeline and a fourth heat exchange pipeline, an electromagnetic valve, a temperature sensor, a flow meter and an auxiliary drive pump are arranged on each heat exchange pipeline, a waste water heat exchange assembly is arranged on the first heat exchange pipeline, a boiler heat exchange assembly is arranged on the second heat exchange pipeline, a ground cooling heat exchange assembly is arranged on the third heat exchange pipeline, and a mechanical refrigeration heat exchange assembly is arranged on the fourth heat exchange pipeline, the first heat exchange pipeline is communicated with the second heat exchange pipeline, the third heat exchange pipeline is communicated with the fourth heat exchange pipeline, and the control system is further included, which is respectively communicated with the main drive pump, the electromagnetic valve, the temperature sensor, the flow meter, the auxiliary drive pump, the waste water heat exchange assembly, the boiler heat exchange assembly, the ground cooling heat exchange assembly and the mechanical refrigeration heat exchange assembly.

[0011] Preferably, a filter unit is arranged on the pipe group close to the return water end.

[0012] Preferably, a water supplement pipeline is arranged between the filter unit and the return water end.

[0013] Preferably, the waste water heat exchange assembly comprises a waste water pipeline connected with a waste water pipe network, a waste water temperature sensor and a waste water flow meter are arranged on the waste water pipeline, and the waste water pipeline is connected with the first heat exchange pipeline through a first plate heat exchanger.

[0014] Preferably, the boiler heat exchange assembly comprises a boiler water pipeline connected with a boiler, a boiler water temperature sensor and a boiler water flow meter are arranged on the boiler water pipeline, and the boiler water pipeline is connected with the second heat exchange pipeline through a second plate heat exchanger.

[0015] Preferably, the ground cooling heat exchange assembly comprises a ground cooling water pipeline arranged in deep underground and connected with a circulating device, a ground cooling water temperature sensor and a ground cooling water flow meter are arranged on the ground cooling water pipeline, and the ground cooling water pipeline is connected with the third heat exchange pipeline through a third plate heat exchanger.

[0016] Preferably, the mechanical refrigeration heat exchange assembly comprises a medium circulation pipeline, a compressor, a condenser, an evaporator and a throttling valve are arranged on the medium circulation pipeline respectively, the evaporator is provided with a heat exchange coil, and the heat exchange coil is connected with the fourth heat exchange pipeline.

[0017] The application also provides a control method of a cold and heat source water supply unit suitable for different seasons, comprising the following steps:

[0018] S1. Real-time acquisition of climate data of a region where the unit is located through a cloud server, including seasonal information, outdoor temperature, humidity and future weather forecast data; the climate data acquisition method is to connect a meteorological department data platform through an API interface and fuse local monitoring data of temperature and humidity sensors deployed around the unit;

[0019] S2. Determination of the current seasonal mode according to the climate data analysis, switching to the winter mode when the average temperature of 5 consecutive days is lower than a set threshold value, and switching to the summer mode when the average temperature is higher than the set threshold value;

[0020] S3. In the winter mode, the waste water heat exchange assembly of the first heat exchange pipeline is preferentially started, and the temperature of the return water end is monitored through a temperature sensor, and when the temperature is lower than a first set value, the boiler heat exchange assembly of the second heat exchange pipeline is started synchronously;

[0021] S4. In summer mode, the ground cooling heat exchange component of the third heat exchange pipeline is preferentially started, and the heat exchange efficiency is monitored through the flow meter, and when the ground cooling water temperature exceeds the second set value, the mechanical refrigeration heat exchange component of the fourth heat exchange pipeline is started in stages;

[0022] S5. The cloud server receives the power grid load data, and dynamically adjusts the rotation speed of the auxiliary drive pump and the working frequency of the main drive pump in the peak and valley period of electricity price;

[0023] S6. Establishing an energy efficiency ratio database of each heat exchange component, dynamically optimizing the cooperative working proportion of multiple heat exchange components according to real-time climate data;

[0024] S7. Abnormal processing, when the cloud server communication is interrupted, automatically switch to the local storage of the same period climate data in the past three years as the control reference; when detecting that any heat exchange pipeline flow meter data is abnormal, automatically switch to the standby pipeline and send a maintenance alarm.

[0025] Preferably, in step S3, the starting of the boiler heat exchange component adopts a PID control algorithm, which specifically includes:

[0026] S31. Calculate the difference ΔT between the set temperature T_set of the return water end and the real-time temperature T_real;

[0027] S32. When ΔT>5℃, the boiler water flow is adjusted according to Q=KpΔT+Ki∫ΔT dt+Kd*dΔT / dt, wherein Kp is the proportional coefficient, Ki is the integral coefficient, and Kd is the differential coefficient;

[0028] S33. The opening degree proportion of the electromagnetic valve of the first heat exchange pipeline and the second heat exchange pipeline is dynamically changed between 3:1 and 1:2.

[0029] Preferably, in step S4, the staged starting includes:

[0030] S41. When the ground cooling water temperature exceeds 25℃, start the first-stage mechanical refrigeration and open 50% of the compressor power;

[0031] S42. When the ground cooling water temperature exceeds 28℃, start the second-stage mechanical refrigeration and open 80% of the compressor power;

[0032] S43. When the ground cooling water temperature exceeds 30℃, run at full power and trigger the anti-condensation control program of the ground cooling heat exchange pipeline.

[0033] The present application has the following beneficial technical effects compared with the prior art:

[0034] This invention provides a cold and hot water supply unit and its control method suitable for different seasons. The return water end is connected to the supply water end through a pipe assembly. The pipe assembly is respectively equipped with a first heat exchange pipe, a second heat exchange pipe, a third heat exchange pipe, and a fourth heat exchange pipe. The first heat exchange pipe is equipped with a wastewater heat exchange component, the second heat exchange pipe is equipped with a boiler heat exchange component, the third heat exchange pipe is equipped with a ground cooling heat exchange component, and the fourth heat exchange pipe is equipped with a mechanical refrigeration heat exchange component. The water supply unit is centrally controlled by a control system. By fusing cloud climate data with local sensors, it can achieve precise seasonal mode switching. At the same time, through PID algorithm, hierarchical control, and energy efficiency database, it can effectively reduce energy consumption. It can also adjust the pump frequency in combination with the peak and off-peak electricity price of the power grid to reduce operating costs. It has local historical data backup and backup pipe switching functions to ensure continuous system operation. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This invention provides a schematic diagram of a cold and hot water supply unit suitable for different seasons. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The purpose of this invention is to provide a cold and hot water supply unit and its control method suitable for different seasons, so as to solve the problems existing in the prior art.

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1:

[0041] This embodiment provides a cold and hot water supply unit suitable for different seasons, such as... Figure 1As shown, including water supply end 1 and backwater end 2, backwater end 2 is connected with water supply end 1 through pipe group, and the pipe group is provided with main drive pump 3, the pipe group is respectively provided with first heat exchange pipe 4, second heat exchange pipe 5, third heat exchange pipe 6 and fourth heat exchange pipe 7, each heat exchange pipe is provided with electromagnetic valve, temperature sensor, flow meter and auxiliary drive pump, the first heat exchange pipe 4 is provided with waste water heat exchange assembly 8, the second heat exchange pipe 5 is provided with boiler heat exchange assembly 9, the third heat exchange pipe 6 is provided with ground cooling heat exchange assembly 10, the fourth heat exchange pipe 7 is provided with mechanical refrigeration heat exchange assembly 11, the first heat exchange pipe 4 is communicated with the second heat exchange pipe 5, the third heat exchange pipe 6 is communicated with the fourth heat exchange pipe 7, and the control system is respectively communicated with the main drive pump 3, the electromagnetic valve, the temperature sensor, the flow meter, the auxiliary drive pump, the waste water heat exchange assembly 8, the boiler heat exchange assembly 9, the ground cooling heat exchange assembly 10 and the mechanical refrigeration heat exchange assembly 11.

[0042] As an embodiment, a filter unit 12 is arranged on the pipe group close to the backwater end, so as to filter the backwater to ensure its cleanliness.

[0043] As an embodiment, a water supplement pipeline 13 is arranged between the filter unit 12 and the backwater end 2, for supplementing water to cope with consumption.

[0044] As an embodiment, the waste water heat exchange assembly 8 comprises a waste water pipeline connected with a waste water pipe network, the waste water pipeline is provided with a waste water temperature sensor and a waste water flow meter, the waste water pipeline is connected with the first heat exchange pipe 4 through a first plate heat exchanger, and the heat in the waste water pipeline is effectively utilized to realize heat supply, and the waste water pipe network can be domestic waste water or industrial waste water.

[0045] As an embodiment, the boiler heat exchange assembly 9 comprises a boiler water pipeline connected with a boiler, the boiler water pipeline is provided with a boiler water temperature sensor and a boiler water flow meter, and the boiler water pipeline is connected with the second heat exchange pipe 5 through a second plate heat exchanger, since the heat in the waste water is low, the waste water heat exchange alone can not meet the heat supply requirement, and therefore the boiler heat exchange assembly 9 is added to ensure sufficient heat.

[0046] As an embodiment, the ground cooling heat exchange assembly 10 comprises a ground cooling water pipeline deeply buried underground and externally connected with a circulating device, the ground cooling water pipeline is provided with a ground cooling water temperature sensor and a ground cooling water flow meter, and the ground cooling water pipeline is connected with the third heat exchange pipe 6 through a third plate heat exchanger, and the underground is rich in cold source, and if the underground cold source is fully utilized, the energy consumed for supplying cold water in summer can be significantly reduced.

[0047] As an implementation, the mechanical refrigeration heat exchange assembly 11 comprises a ground medium circulation pipeline, and a compressor, a condenser, an evaporator and a throttle valve are respectively arranged on the medium circulation pipeline. The evaporator is provided with a heat exchange coil, and the heat exchange coil is connected with the fourth heat exchange pipeline 7, so as to provide sufficient cold energy when the temperature is too high.

[0048] The embodiment also provides a control method of the cold and heat source water supply unit suitable for different seasons, and the control method comprises the following steps:

[0049] S1. Real-time acquisition of climate data of a region where the unit is located through a cloud server, including seasonal information, outdoor temperature, humidity and future weather forecast data; the climate data acquisition method is to connect a meteorological department data platform through an API interface, and to fuse local monitoring data of temperature and humidity sensors deployed around the unit;

[0050] S2. Determination of a current seasonal mode according to the climate data analysis, switching to a winter mode when the average temperature of 5 consecutive days is lower than a set threshold value, and switching to a summer mode when the average temperature is higher than the set threshold value;

[0051] S3. In the winter mode, the waste water heat exchange assembly of the first heat exchange pipeline is preferentially started, and the temperature of the return water end is monitored through a temperature sensor; when the temperature is lower than a first set value, the boiler heat exchange assembly of the second heat exchange pipeline is started synchronously; the starting of the boiler heat exchange assembly adopts a PID control algorithm, and specifically comprises the following steps:

[0052] S31. Calculation of a difference ΔT between a set temperature T_set of the return water end and a real-time temperature T_real;

[0053] S32. When ΔT> 5 ℃, the boiler water flow is adjusted according to Q=KpΔT+Ki∫ΔT dt+Kd*dΔT / dt, wherein Kp is a proportional coefficient, Ki is an integral coefficient, and Kd is a differential coefficient;

[0054] S33. The opening degree proportion of the electromagnetic valves of the first heat exchange pipeline and the second heat exchange pipeline is dynamically changed between 3:1 and 1:2 synchronously;

[0055] S4. In the summer mode, the ground cooling heat exchange assembly of the third heat exchange pipeline is preferentially started, and the heat exchange efficiency is monitored through a flowmeter; when the ground cooling water temperature exceeds a second set value, the mechanical refrigeration heat exchange assembly of the fourth heat exchange pipeline is started in stages; the starting in stages comprises the following steps:

[0056] S41. When the ground cooling water temperature exceeds 25 ℃, primary mechanical refrigeration is started, and 50% compressor power is started;

[0057] S42. When the ground cooling water temperature exceeds 28 ℃, secondary mechanical refrigeration is started, and 80% compressor power is started;

[0058] S43. When the ground cold water temperature exceeds 30℃, full power operation is performed and the anti-condensation control program of the ground cold heat exchange pipeline is triggered;

[0059] S5. The power grid load data is received through the cloud server, and the rotation speed of the auxiliary drive pump and the working frequency of the main drive pump are dynamically adjusted during the peak and valley periods of electricity price;

[0060] S6. A database of energy efficiency ratios of various heat exchange components is established, and the collaborative working proportion of multiple heat exchange components is dynamically optimized according to real-time climate data;

[0061] S7. Abnormality processing, when the cloud server communication is interrupted, automatically switch to the local stored near three years of the same period climate data as the control reference; when detecting any heat exchange pipeline flow meter data abnormality, automatically switch to the standby pipeline and send maintenance alarm.

[0062] The application provides a cold and heat source water supply unit suitable for different seasons and a control method thereof, which realizes accurate seasonal mode switching through fusion of cloud climate data and local sensors, effectively reduces energy consumption through PID algorithm, hierarchical control and energy efficiency database, can also adjust pump frequency in combination with peak and valley electricity prices of a power grid to reduce operation cost, has local historical data backup and standby pipeline switching functions, and guarantees continuous operation of the system.

[0063] The application has applied specific examples to describe the principles and implementation modes of the application, and the above embodiment description is only used to help understand the method and core idea of the application; meanwhile, for those skilled in the art, according to the idea of the application, the specific implementation mode and application range will be changed. In conclusion, the content of the specification should not be understood as a limitation of the application.

Claims

1. A cold and heat source water supply unit suitable for different seasons, comprising a water supply end and a return water end, the return water end being connected with the water supply end through a pipe group, and a main drive pump being arranged on the pipe group, characterized in that: The pipe group is respectively provided with a first heat exchange pipe, a second heat exchange pipe, a third heat exchange pipe and a fourth heat exchange pipe, and an electromagnetic valve, a temperature sensor, a flow meter and an auxiliary drive pump are arranged on each heat exchange pipe, a waste water heat exchange assembly is arranged on the first heat exchange pipe, a boiler heat exchange assembly is arranged on the second heat exchange pipe, a ground cooling heat exchange assembly is arranged on the third heat exchange pipe, and a mechanical refrigeration heat exchange assembly is arranged on the fourth heat exchange pipe, the first heat exchange pipe is communicated with the second heat exchange pipe, the third heat exchange pipe is communicated with the fourth heat exchange pipe, and a control system is further arranged, and the control system is communicated with the main drive pump, the electromagnetic valve, the temperature sensor, the flow meter, the auxiliary drive pump, the waste water heat exchange assembly, the boiler heat exchange assembly, the ground cooling heat exchange assembly and the mechanical refrigeration heat exchange assembly. The control method suitable for cold and heat source water supply units in different seasons comprises the following steps: S1. Real-time acquisition of climate data of the region where the unit is located through a cloud server, including seasonal information, outdoor temperature, humidity and future weather forecast data; the climate data acquisition method is to connect the meteorological department data platform through the API interface, and to fuse the local monitoring data of the temperature and humidity sensors deployed around the unit; S2. According to the climate data analysis, determine the current seasonal mode, switch to winter mode when the average temperature of the past 5 days is lower than the set threshold, and switch to summer mode when it is higher than the set threshold; S3. In winter mode, preferentially open the waste water heat exchange assembly of the first heat exchange pipe, and monitor the return water temperature through the temperature sensor, and when the temperature is lower than the first set value, simultaneously start the boiler heat exchange assembly of the second heat exchange pipe; S4. In summer mode, preferentially open the ground cooling heat exchange assembly of the third heat exchange pipe, and monitor the heat exchange efficiency through the flow meter, and when the ground cooling water temperature exceeds the second set value, grade start the mechanical refrigeration heat exchange assembly of the fourth heat exchange pipe; S5. Receive power grid load data through the cloud server, and dynamically adjust the speed of the auxiliary drive pump and the working frequency of the main drive pump during the peak and valley period of electricity price; S6. Establish an energy efficiency ratio database of each heat exchange assembly, and dynamically optimize the cooperative working ratio of multiple heat exchange assemblies according to real-time climate data; S7. Abnormal processing, when the cloud server communication is interrupted, automatically switch to the local stored same period climate data in the past three years as the control reference; when any heat exchange pipe flow meter data is abnormal, automatically switch to the standby pipe and send a maintenance alarm.

2. The cold and heat source water supply unit for different seasons according to claim 1, characterized in that: A filter unit is arranged on the pipe group close to the return water end.

3. The cold and heat source water supply unit suitable for different seasons according to claim 2, characterized in that: A water supplement pipeline is arranged between the filter unit and the return water end.

4. The cold and heat source water supply unit for different seasons according to claim 1, characterized in that: The waste water heat exchange assembly comprises a waste water pipeline connected with a waste water pipe network, a waste water temperature sensor and a waste water flow meter arranged on the waste water pipeline, and the waste water pipeline is connected with the first heat exchange pipe through a first plate heat exchanger.

5. The cold and heat source water supply unit suitable for different seasons according to claim 1, characterized in that: The boiler heat exchange assembly comprises a boiler water pipeline connected with a boiler, a boiler water temperature sensor and a boiler water flow meter arranged on the boiler water pipeline, and the boiler water pipeline is connected with the second heat exchange pipe through a second plate heat exchanger.

6. The cold and heat source water supply unit suitable for different seasons according to claim 1, characterized in that: The ground cooling heat exchange assembly comprises a ground cooling water pipeline, which is arranged in the ground and is connected with a circulating device, and is provided with a ground cooling water temperature sensor and a ground cooling water flow meter.

7. The cold and heat source water supply unit suitable for different seasons according to claim 1, characterized in that: The mechanical refrigeration heat exchange assembly comprises a ground medium circulating pipeline, which is respectively provided with a compressor, a condenser, an evaporator and a throttle valve, and the evaporator is provided with a heat exchange coil connected with the fourth heat exchange pipeline.

8. The cold and heat source water supply unit suitable for different seasons according to claim 1, characterized in that: In step S3, the PID control algorithm is used for starting the boiler heat exchange assembly, specifically including: S31. Calculate the difference ΔT between the set temperature T_set and the real-time temperature T_real of the return water; S32. When ΔT>5℃, the boiler water flow is adjusted according to Q=KpΔT+Ki∫ΔT dt+Kd*dΔT / dt, wherein Kp is the proportional coefficient, Ki is the integral coefficient, and Kd is the differential coefficient; S33. The opening degree ratio of the electromagnetic valves of the first heat exchange pipeline and the second heat exchange pipeline is dynamically changed between 3:1 and 1:

2.

9. The cold and heat source water supply unit suitable for different seasons according to claim 1, characterized in that: In step S4, the step-by-step starting includes: S41. When the ground cooling water temperature exceeds 25℃, start the first-stage mechanical refrigeration and open 50% of the compressor power; S42. When the ground cooling water temperature exceeds 28℃, start the second-stage mechanical refrigeration and open 80% of the compressor power; S43. When the ground cooling water temperature exceeds 30℃, run at full power and trigger the anti-condensation control program of the ground cooling heat exchange pipeline.

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