A constant temperature system for roadbed and pavement

Abstract

The present invention discloses a constant temperature system for roadbed and pavement, which relates to the technical field of road temperature control, and includes a ground heat exchange component arranged below the road surface; a buried pipe heat exchange device buried underground; a pipeline component; a heat pump unit, the buried pipe heat exchange device is connected to the heat pump unit; the heat pump unit is connected to the ground heat exchange component; a solar device, the solar device is connected to the heat pump unit; a cooling water device, the cooling water device is connected to the heat pump unit; a phase change energy storage device, the phase change energy storage device is connected to the solar device and the cooling water device; the phase change energy storage device can input hot water in the solar device for heat exchange and energy storage, and output the cooling water after heat exchange to the cooling water device for cold storage; the phase change energy storage device can input cooling water in the cooling water device to heat it up, and output the heated water to the heat pump unit through the pipeline component for heating. The present invention comprehensively utilizes various forms of energy to achieve heat balance regulation of roadbed and pavement in different seasons.

Description

Technical Field

[0001] The invention relates to the technical field of road temperature control, and in particular to a roadbed and pavement constant temperature system. Background Art

[0002] Urban roads and highways are vulnerable to climate change, which seriously affects people's travel safety. In order to continuously improve the climate resilience of urban roads or highways, some new systems need to be designed to make necessary preparations for extreme climate impacts.

[0003] At present, solar energy and geothermal energy have received extensive attention in the field of building energy supply. They are the key energy utilization methods to achieve clean energy supply. However, the utilization of these two energies has certain limitations. Among them, the utilization of solar energy is mainly concentrated in photovoltaic power generation and solar thermal energy. However, solar energy is greatly affected by weather and can only be used during the day when the sunlight is strong. In the field of building energy conservation, geothermal energy mainly meets the heating and cooling needs of buildings in the form of ground source heat pumps. However, the heat energy available per unit area of ​​soil is limited. Especially in cold areas, the heating load in winter is much greater than the cooling load demand in summer. The long-term operation of ground source heat pumps will cause the soil temperature to drop, resulting in reduced heat pump efficiency and a certain impact on the ecological environment. The traditional road surface temperature control method mainly relies on chemical deicing agents or electric heating equipment, which has problems such as high energy consumption and environmental pollution. In the prior art, there are few applications that organically combine solar energy, phase change energy storage and ground source heat pumps. Therefore, in order to cope with the adverse effects of extreme climate on roads, a roadbed and pavement constant temperature multi-system is needed that can overcome the problem of imbalanced cold and hot loads caused by long-term use of ground source heat pumps, thereby achieving thermal balance between the road surface and the roadbed.

[0004] Therefore, how to provide a roadbed and pavement constant temperature system that can organically combine solar energy, phase change energy storage and ground source heat pumps, achieve thermal balance regulation of road pavement and roadbed in different seasons through comprehensive utilization of various forms of energy, and have the characteristics of high resource utilization, low energy consumption and clean energy supply is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the roadbed and pavement constant temperature system proposed in the present invention aims to solve the technical problems that the traditional ground source heat pump has a single heat source, which can easily lead to soil thermal imbalance and unbalanced cold and heat loads after long-term use, and cannot effectively maintain the thermal balance of the roadbed and pavement.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The present invention provides a roadbed and pavement constant temperature system, comprising:

[0008] A ground heat exchange component, which is buried under the road surface and exchanges heat with the roadbed and road surface;

[0009] A buried pipe heat exchange device, which is buried underground to exchange heat with the soil;

[0010] Pipeline components, used for the delivery control of the system heat exchange medium;

[0011] The heat pump unit, the underground heat exchange device is connected to the heat pump unit through the pipeline assembly to serve as a heat source or cold source for heat exchange; the heat pump unit is connected to the ground heat exchange assembly through the pipeline assembly to transfer heat to the roadbed and pavement to increase the temperature or cool down the roadbed and pavement;

[0012] A solar device, the solar device being connected to the heat pump unit via the pipe assembly to serve as a heat source for heat exchange;

[0013] A cooling water device, the cooling water device is connected to the heat pump unit through the pipeline assembly to serve as a cold source for heat exchange;

[0014] A phase-change energy storage device, wherein the phase-change energy storage device is connected to the solar device and the cooling water device through the pipeline assembly; the phase-change energy storage device can input hot water in the solar device for heat exchange and energy storage, and output the cooling water after heat exchange to the cooling water device for cold storage; the phase-change energy storage device can input cooling water in the cooling water device to heat the cooling water and output the heated water to the heat pump unit through the pipeline assembly for heating.

[0015] When a roadbed and pavement constant temperature system of the present invention is in use, the heat pump unit controls the temperature of the roadbed and pavement through a ground heat exchange component buried under the pavement; the buried pipe heat exchange device can provide cooling or heating for the heat pump unit in winter and summer, and the solar energy device can convert solar energy into thermal energy, and directly provide heating for the heat pump unit in winter to improve the working performance of the heat pump unit; the cooling water device is used to store cooling water and can directly provide cooling for the heat pump unit; the solar energy device can also store the excess heat generated through the phase change energy storage device for energy storage; the cooling water discharged during the heat storage process of the phase change energy storage device can be stored in the cooling water device for storage and cold storage; the cooling water in the cooling water device can be heated by the phase change energy storage device and transported to the heat pump unit, realizing the use of the energy stored in the phase change energy storage device to heat the heat pump unit. The present invention uses a variety of energy forms such as solar energy, phase change energy storage, geothermal energy and cold water to assist the heat pump unit in regulating the temperature of the roadbed and pavement to achieve thermal balance. There is no need to extract geothermal heat for a long time, which solves the problem of soil thermal imbalance. It is more conducive to the system to achieve balanced cold and hot loads throughout the year, and can achieve effective regulation of the thermal balance of road pavement and roadbed in different seasons. It has the advantages of high resource utilization, low energy consumption and clean energy supply.

[0016] As a further improvement of the above technical solution, the solar device includes a solar panel assembly and a solar heat exchanger, the solar panel assembly is cyclically connected to the solar heat exchanger through the pipeline assembly to circulate the heat exchange medium; the solar heat exchanger is cyclically connected to the heat pump unit through the pipeline assembly to provide heat; the solar panel assembly is electrically connected to the heat pump unit to provide electrical energy.

[0017] The beneficial effects of the above technical solution are: the solar panel assembly can convert solar energy into electrical energy to meet the power demand of the heat pump unit; the solar panel assembly can also convert solar energy into thermal energy and transfer the heat to the circulating water through the solar heat exchanger, and the heated circulating water is used to supply heat to the heat pump unit through the pipeline assembly.

[0018] As a further improvement of the above technical solution, the cooling water device includes a drainage collector and a cooling water tank arranged on one side of the roadbed and pavement; the drainage collector is connected to the cooling water tank through the pipeline assembly, and the collected ground water can be transported to the cooling water tank for use as heat exchange circulation water; the cooling water tank is connected to the heat pump unit through the pipeline assembly; the cooling water tank is connected to the phase change energy storage device through the pipeline assembly.

[0019] The beneficial effect of the above technical solution is that the drainage collector is used to collect ground water and can be stored in a cooling water tank to provide heat exchange circulation water for the system.

[0020] As a further improvement of the above technical solution, the phase change energy storage device includes an insulation box and a heat storage ball arranged inside the insulation box; the solar heat exchanger, the insulation box and the cooling water storage tank are connected in sequence through the pipeline assembly.

[0021] The beneficial effects of the above technical solution are: the heat storage balls are used to store heat, and the heat preservation box can prevent heat loss.

[0022] As a further improvement of the above technical solution, the heat storage ball is a HDPE plastic hollow ball, and a heat storage phase change material is installed inside it; the heat storage phase change material is a 36°C heat storage phase change material, including sodium hydroxide, sodium chloride and water, with a mass percentage of: 30-50% sodium hydroxide, 0-10% sodium chloride and 40-60% water, its phase change latent heat is 240-260KJ / kg, and its density is 1.45-1.55kg / l.

[0023] As a further improvement of the above technical solution, the pipeline assembly includes a first inlet pipe, a first outlet pipe, a second inlet pipe, a second outlet pipe, a third inlet pipe, a third outlet pipe, a fourth inlet pipe and a fourth outlet pipe;

[0024] One end of the first inlet pipe is connected to the heat medium outlet of the solar panel assembly, and the other end is connected to the heat medium inlet M of the solar heat exchanger; one end of the first outlet pipe is connected to the heat medium outlet N of the solar heat exchanger, and the other end is connected to the heat medium inlet of the solar panel assembly, so as to form a heat exchange circulation loop 1; a circulation pump 1 and a temperature sensor 1 are installed on the heat exchange circulation loop 1;

[0025] One end of the second inlet pipe is connected to the cold medium outlet A of the solar heat exchanger, and the other end is connected to the inlet T of the evaporator of the heat pump unit; one end of the second outlet pipe is connected to the outlet V of the evaporator of the heat pump unit, and the other end is connected to the cold medium inlet H of the solar heat exchanger, so as to form a heat exchange circulation loop 2; a circulation pump 2, a valve 1 and a temperature sensor 2 are installed on the heat exchange circulation loop 2;

[0026] One end of the third inlet pipe is connected to the outlet S of the cooling water device, and the other end is connected to the inlet T of the evaporator of the heat pump unit; one end of the third outlet pipe is connected to the outlet V of the evaporator of the heat pump unit, and the other end is connected to the water inlet U of the cooling water device to form a heat exchange circulation loop three; a circulation pump three, a valve two and a temperature sensor three are installed on the heat exchange circulation loop three;

[0027] One end of the fourth inlet pipe is connected to the condenser outlet W of the heat pump unit, and the other end is connected to the inlet of the ground heat exchange component; one end of the fourth outlet pipe is connected to the outlet of the ground heat exchange component, and the other end is connected to the inlet X of the condenser of the heat pump unit to form a heat exchange circulation loop four; a circulating pump four, a valve three and a temperature sensor four are installed on the heat exchange circulation loop four.

[0028] The beneficial effects of the above technical solution are: circulating pump 1 is used to drive the heat medium to circulate in heat exchange circulation loop 1, so as to circulate the heat energy obtained by the solar panel assembly to the solar heat exchanger; circulating pump 2 is used to drive the circulating water to circulate in the heat exchange circulation loop 2, so that the circulating water absorbs heat and energy in the solar heat exchanger to become heated circulating water, and the heated circulating water is circulated to the evaporator of the heat pump unit for auxiliary heating; circulating pump 3 is used to drive the low-temperature circulating water in the cooling water device to circulate in the heat exchange circulation loop 3, so as to circulate the low-temperature circulating water to the evaporator of the heat pump unit for auxiliary cooling; circulating pump 4 is used to drive the circulating water to circulate in the heat exchange circulation loop 4, so as to circulate heat exchange between the condenser of the heat pump unit and the ground heat exchange component, so as to adjust the temperature of the roadbed and pavement and achieve a constant temperature of the roadbed and pavement. Temperature sensor 1, temperature sensor 2, temperature sensor 3 and temperature sensor 4 can collect the temperature of the circulating medium in each circulation loop. According to the temperature conditions, the switching between cooling and heating can be achieved by controlling valve 1 and valve 2. Valve 3 can control the opening and closing of heat exchange circulation loop 4.

[0029] As a further improvement of the above technical solution, the pipeline assembly further includes a connecting pipe 1, a connecting pipe 2 and a connecting pipe 3;

[0030] One end of the connecting pipe 1 is connected to the cold medium outlet P of the solar heat exchanger, and the other end is connected to the water inlet Y of the phase change energy storage device; one end of the connecting pipe 2 is connected to the water inlet Q of the phase change energy storage device, and the other end is connected to the water inlet R of the cooling water device; one end of the connecting pipe 3 is connected to the water inlet U of the phase change energy storage device, and the other end is connected to the inlet T of the evaporator of the heat pump unit;

[0031] The connecting pipe one is installed with a valve four; the connecting pipe two is installed with a valve five and a circulating pump five; the connecting pipe three is installed with a valve six.

[0032] The beneficial effects of the above technical solution are: the circulating pump 5 can drive the heated circulating water after heat exchange in the solar heat exchanger to enter the phase change energy storage device for heat storage, and the circulating water will become low-temperature cooling water after flowing out of the phase change energy storage device, and the low-temperature cooling water can be stored in the cooling water device for cold supply standby; the circulating pump 5 can drive the cooling water in the cooling water device to enter the phase change energy storage device for heat absorption and temperature increase, and transport the heated circulating water to the evaporator of the heat pump unit for auxiliary heating. The heat storage function of the phase change energy storage device can store the excess heat energy generated by the solar device so that it can be released and used when needed; the phase change energy storage device can cool the high-temperature circulating water to supply cold water to the cooling water device, thereby improving the storage effect of cold water in the cooling water device.

[0033] As a further improvement of the above technical solution, the pipeline assembly further includes a connecting pipe four, a connecting pipe five and a connecting pipe six;

[0034] One end of the connecting pipe 4 is connected to the water inlet O of the buried pipe heat exchange device, and the other end is connected to the second inlet pipe; the valve 1 includes valve 1A, valve 1B and valve 1C; the valve 1A and the valve 1B are installed on the second inlet pipe and correspond to the two sides of the other end of the connecting pipe 4 one by one; the circulating pump 2 is installed on the second inlet pipe and corresponds to between the valve 1A and the cold medium outlet A; the valve 1C is installed on the second inlet pipe;

[0035] One end of the connecting pipe 5 is connected to the water inlet L of the buried pipe heat exchange device, and the other end is connected to the second outlet pipe and corresponds to the cold medium inlet H of the solar heat exchanger and the valve 1 C;

[0036] The connecting pipe 4 is provided with a valve 7; the connecting pipe 5 is provided with a valve 8 and a circulating pump 6;

[0037] The connecting pipe 6 is connected in parallel to the connecting pipe 5, and its two ends correspond to the outer sides of the valve 8 and the circulating pump 6; the connecting pipe 6 is provided with a valve 9.

[0038] The beneficial effect of the above technical solution is that the circulating pump 6 can drive the circulating water to circulate in the underground heat exchange device, the connecting pipe 4, the second inlet pipe, the evaporator of the heat pump unit, the second outlet pipe and the connecting pipe 5, forming a heat exchange circulation loop 5, so as to circulate the constant temperature water in the underground heat exchange device after heat exchange with the geothermal energy to the evaporator of the heat pump unit for cooling or heating. The circulating pump 2 can drive the circulating water to circulate in the underground heat exchange device, the connecting pipe 6, the solar heat exchanger, the second inlet pipe and the connecting pipe 4, forming a heat exchange circulation loop 6, so as to transport the heat energy in the solar heat exchanger to the underground heat exchange device through the circulating water, and realize the heat supplement of the soil at the underground heat exchange device, so as to further realize the heat balance of the soil. The switching of the heat exchange circulation loop 5 and the heat exchange circulation loop 6 can be realized by controlling the opening and closing of valve 1A, valve 1B, valve 1C, valve 7, valve 8 and valve 9.

[0039] As a further improvement of the above technical solution, it also includes a controller, wherein the pipeline assembly is equipped with multiple temperature sensors for detecting the temperature of the circulating medium in the pipeline, multiple electric-controlled valves for opening and closing the pipeline, and multiple pump bodies for driving the circulating medium to flow in the pipeline. The controller is electrically connected to the temperature sensor, the electric-controlled valve, the pump body and the heat pump unit, and is used to open and close the electric-controlled valve, the pump body and the heat pump unit according to the temperature data received from the temperature sensor, thereby collaboratively controlling the heat exchange between the buried pipe heat exchange device, the solar energy device, the cooling water device and the phase change energy storage device and the heat pump unit, and controlling the heat exchange between the heat pump unit and the ground heat exchange component.

[0040] The beneficial effect of the above technical solution is that the controller coordinates and controls each heat source or cold source according to the temperature conditions of the circulation loop to provide auxiliary heating or cooling for the heat pump unit, which can cope with the changes in ambient temperature throughout the year and is conducive to achieving constant temperature regulation of the roadbed and pavement.

[0041] As a further improvement of the above technical solution, the buried pipe of the buried pipe heat exchange device is a plurality of U-shaped bent pipes connected in sequence and distributed vertically on the ground, and the diameter of the buried pipe is smaller than the diameter of the pipeline assembly.

[0042] The beneficial effects of the above technical solution are: the buried pipe adopts a U-shaped bent pipe distributed vertically on the ground, and the diameter of the buried pipe is relatively small, which is convenient for the fluid in the pipe to present a turbulent zone, so that the heat exchange effect between the fluid and the inner wall of the pipe is better; the diameter of the pipeline assembly is relatively large, which can reduce the energy consumption of the circulation pump in the circulation loop, and is more energy-saving and environmentally friendly.

[0043] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a roadbed and pavement constant temperature system, which has the following advantages and beneficial effects:

[0044] 1. The present invention can utilize solar energy to convert into heat energy and electrical energy through the solar energy device, which is convenient for auxiliary power supply for the heat pump unit and reduces energy loss. At the same time, the heat energy can be stored in the phase change energy storage device. In winter when the temperature is low and the sunlight time is short, resulting in insufficient solar energy, the energy collected by the phase change energy storage device can be transmitted to the heat pump unit through the heating pipeline to assist the heat pump unit in heating work.

[0045] 2. The present invention collects rainwater from roads through drainage collectors, which can be stored in cooling water tanks after purification. In summer, the ground source heat pump unit is used to assist in cooling, thereby cooling the road surface and reducing the impact on the ecological environment.

[0046] 3. The solar device of the present invention generates heat through a heat exchange medium, exchanges heat with circulating water through a heat exchanger, and then transports the circulating water to the buried pipe heat exchanger through a pipeline to replenish heat for the soil and provide protection for the operation of the heat pump unit in winter. The heat exchange medium can improve the utilization rate of solar energy and the heat replenishment effect, and the heat exchange medium will not contact the circulating water, avoiding the impact of cold and hot contact on the heat replenishment effect.

[0047] 4. The controller of the present invention adjusts different operation modes automatically according to different seasons, and each unit works together to keep the roadbed and pavement at a relatively constant temperature throughout the year, effectively alleviating the adverse effects of extreme weather on urban road facilities.

[0048] 5. The solar energy device and phase change energy storage device of the present invention serve as a supplement to the heat of the ground source heat pump for winter heating, reduce the drop in soil temperature caused by the long-term operation of the ground source heat pump, solve the problem of long-term imbalance in cold and hot loads in the use of ground source heat, and achieve thermal balance in the long-term use of the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0050] Figure 1 A schematic diagram of the overall structure of a roadbed and pavement constant temperature system of the present invention;

[0051] Figure 2 A schematic diagram of the buried state of a ground heat exchange component of a roadbed and pavement constant temperature system of the present invention;

[0052] Figure 3 A schematic diagram of the structure of a phase change energy storage device for a roadbed and pavement constant temperature system according to the present invention;

[0053] In the figure: 1, ground heat exchange assembly; 11, shell; 12, heat dissipation pipe; 2, buried pipe heat exchange device; 21, buried pipe; 3, pipeline assembly; 301, first inlet pipe; 302, first outlet pipe; 303, second inlet pipe; 304, second outlet pipe; 305, third inlet pipe; 306, third outlet pipe; 307, fourth inlet pipe; 308, fourth outlet pipe; 309, circulation pump 1; 310, temperature sensor 1; 311, circulation pump 2; 312, temperature sensor 2; 313, circulation pump 3; 314, temperature sensor 3; 315, circulation pump 4; 316, temperature sensor 4; 317, circulation pump 5; 318, temperature sensor 5; 319, circulation pump 6; 320, temperature sensor 6; 321, circulation pump 7; 322, temperature sensor 7; 323, circulation pump 8; 324, temperature sensor 8; 325, circulation pump 9; 326, temperature sensor 9; 327, temperature sensor 10; 328, circulation pump 11; 329, circulation pump 12; 330, temperature sensor 12; 331, circulation pump 13; 332, temperature sensor 13; 333, circulation pump 14; 334, circulation pump 15; 335, circulation pump 16 Circulation pump 2; 312, valve 1; 3121, valve 1A; 3122, valve 1B; 3123, valve 1C; 313, temperature sensor 2; 314, circulation pump 3; 315, valve 2; 316, temperature sensor 3; 317, circulation pump 4; 318, valve 3; 3181, valve 3A; 3182, valve 3B; 319, temperature sensor 4; 320, connecting pipe 1; 321, connecting pipe 2; 322, connecting pipe three; 323, valve four; 324, valve five; 325, circulating pump five; 326, valve six; 327, connecting pipe four; 328, connecting pipe five; 329, connecting pipe six; 330, valve seven; 331, valve eight; 332, circulating pump six; 333, valve nine; 334, connecting pipe seven; 335, valve ten; 4, heat pump unit; 41, evaporator; 42, condenser; 43, compressor; 44. Throttle valve; 5. Solar energy device; 51. Solar panel assembly; 511. Solar power generation collector; 512. Inverter; 52. Solar heat exchanger; 6. Cooling water device; 61. Drainage collector; 611. Water storage container; 612. Filter; 62. Cooling water storage tank; 7. Phase change energy storage device; 71. Insulation box; 72. Heat storage ball; 8. Municipal power grid; 9. Road; 91. Roadbed; 92. Road surface. DETAILED DESCRIPTION

[0054] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0055] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] like Figures 1 to 3 As shown, a roadbed and pavement constant temperature system comprises:

[0059] A ground heat exchange component 1, which is buried under the road surface and exchanges heat with the roadbed and road surface;

[0060] The buried pipe heat exchange device 2 is buried underground to exchange heat with the soil;

[0061] Pipeline component 3, used for conveying and controlling the heat exchange medium of the system;

[0062] The heat pump unit 4 and the buried pipe heat exchange device 2 are connected to the heat pump unit 4 through the pipeline assembly 3 to serve as a heat source or a cold source for heat exchange; the heat pump unit 4 is connected to the ground heat exchange assembly 1 through the pipeline assembly 3 to transfer heat to the roadbed and pavement to increase the temperature or cool down the roadbed and pavement;

[0063] A solar device 5, which is connected to a heat pump unit 4 via a pipe assembly 3 to serve as a heat source for heat exchange;

[0064] A cooling water device 6, the cooling water device 6 is connected to the heat pump unit 4 through the pipeline assembly 3 to serve as a cold source for heat exchange;

[0065] Phase change energy storage device 7, phase change energy storage device 7 is connected to solar energy device 5 and cooling water device 6 through pipeline assembly 3; phase change energy storage device 7 can input hot water in solar energy device 5 for heat exchange and energy storage, and output cooling water after heat exchange to cooling water device 6 for cold storage; phase change energy storage device 7 can input cooling water in cooling water device 6 to heat the cooling water, and output the heated water to heat pump unit 4 through pipeline assembly 3 for heating.

[0066] When a roadbed and pavement constant temperature system of the present invention is used, the heat pump unit 4 controls the temperature of the roadbed and pavement through the ground heat exchange component 1 buried under the pavement; the buried pipe heat exchange device 2 can provide cooling or heating for the heat pump unit 4 in winter and summer, and the solar energy device 5 can convert solar energy into thermal energy, and directly provide heating to the heat pump unit 4 in winter to improve the working performance of the heat pump unit 4; the cooling water device 6 is used to store cooling water and can directly provide cooling to the heat pump unit 4; the solar energy device 5 can also store the excess heat generated through the phase change energy storage device 7 for energy storage; the cooling water discharged during the heat storage process of the phase change energy storage device 7 can be stored in the cooling water device 6 for storage and cold storage; the cooling water in the cooling water device 6 can be heated by the phase change energy storage device 7 and transported to the heat pump unit 4, realizing the use of the stored energy of the phase change energy storage device 7 to heat the heat pump unit 4. The present invention uses a variety of energy forms such as solar energy, phase change energy storage, geothermal energy and cold water to assist the heat pump unit 4 in regulating the temperature of the roadbed and pavement to achieve thermal balance. There is no need to extract geothermal heat for a long time, which solves the problem of soil thermal imbalance and is more conducive to the system achieving balanced cold and hot loads throughout the year. It can achieve effective regulation of the thermal balance of road pavement and roadbed in different seasons and has the advantages of high resource utilization, low energy consumption and clean energy supply.

[0067] Specifically, the heat pump unit 4 includes an evaporator 41, a compressor 43, a condenser 42 and a throttle valve 44 which are connected in a circular manner. The circulating water passes through the evaporator 41, outputs steam, and passes through the compressor 43 to do work, changing from low-temperature and low-pressure gas to high-temperature and high-pressure gas. It flows to the condenser 42 for heat exchange and is then transported to the ground heat exchange component 1 for circulation. The circulating water becomes liquid and the temperature is reduced. After being throttled by the throttle valve 44, the circulating water flows back to the evaporator 41 to absorb heat, and then passes through the compressor 43 for the next cycle. The cooling and heating principle of the heat pump unit 4 is a prior art and will not be repeated here.

[0068] In some embodiments, the solar device 5 includes a solar panel assembly 51 and a solar heat exchanger 52. The solar panel assembly 51 is cyclically connected to the solar heat exchanger 52 through a pipe assembly 3 to circulate the heat exchange medium; the solar heat exchanger 52 is cyclically connected to the heat pump unit 4 through the pipe assembly 3 to provide heat; the solar panel assembly 51 is electrically connected to the heat pump unit 4 to provide electrical energy.

[0069] The solar panel assembly 51 can convert solar energy into electrical energy to meet the power demand of the heat pump unit 4; the solar panel assembly 51 can also convert solar energy into thermal energy and transfer the heat to the circulating water through the solar heat exchanger 52. The heated circulating water supplies heat to the heat pump unit 4 through the pipeline assembly 3.

[0070] Specifically, the solar panel assembly 51 includes a solar power generation panel and a solar thermal collector panel, or the solar panel assembly 51 adopts an integrated solar power generation collector panel; when there is light, the solar panel assembly 51 starts to work and converts solar energy into electrical energy. Solar photovoltaic power generation can be connected to the grid, and after being converted into alternating current through the inverter 512, it is connected to the municipal power grid 8, which can directly provide the electricity required for the operation of the compressor 43 in the heat pump unit 4. The insufficient part can be provided by the municipal power grid 8, and the excess part can be connected to the grid.

[0071] In some embodiments, the cooling water device 6 includes a drainage collector 61 and a cooling water tank 62 arranged on one side of the roadbed pavement; the drainage collector 61 is connected to the cooling water tank 62 through the pipeline assembly 3, and the collected ground water can be transported to the cooling water tank 62 for use as heat exchange circulation water; the cooling water tank 62 is connected to the heat pump unit 4 through the pipeline assembly 3; the cooling water tank 62 is connected to the phase change energy storage device 7 through the pipeline assembly 3.

[0072] The drainage collector 61 is used to collect ground water and store it in the cooling water storage tank 62 to provide heat exchange circulation water for the system.

[0073] Specifically, the drainage collector 61 includes a water storage container 611 and a filter 612. The water storage container 611 can be a water storage tank or a water reservoir. The water storage container 611 is connected to the cooling water storage tank 62 through the connecting pipe 7334. The filter 612 is installed on the connecting pipe 7334. The water in the water storage container 611 is filtered by the filter and then transported to the cooling water storage tank 62 as circulating water. The cooling water storage tank 62 can be a water storage tank with cooling function in the prior art.

[0074] In some embodiments, the phase change energy storage device 7 includes a heat preservation box 71 and a heat storage ball 72 arranged inside the heat preservation box 71; the solar heat exchanger 52, the heat preservation box 71 and the cooling water tank 62 are connected in sequence through the pipeline assembly 3.

[0075] The heat storage ball 72 is used to store heat, and the heat preservation box 71 can prevent heat loss.

[0076] In some embodiments, the heat storage ball 72 is a HDPE plastic hollow ball, and a heat storage phase change material is installed inside it; the heat storage phase change material is a 36°C heat storage phase change material, including sodium hydroxide, sodium chloride and water, with a mass percentage of: 30-50% sodium hydroxide, 0-10% sodium chloride and 40-60% water, its phase change latent heat is 240-260KJ / kg, and its density is 1.45-1.55kg / l.

[0077] In some embodiments, the pipeline assembly 3 includes a first inlet pipe 301, a first outlet pipe 302, a second inlet pipe 303, a second outlet pipe 304, a third inlet pipe 305, a third outlet pipe 306, a fourth inlet pipe 307 and a fourth outlet pipe 308;

[0078] One end of the first inlet pipe 301 is connected to the heat medium outlet of the solar panel assembly 51, and the other end is connected to the heat medium inlet M of the solar heat exchanger 52; one end of the first outlet pipe 302 is connected to the heat medium outlet N of the solar heat exchanger 52, and the other end is connected to the heat medium inlet of the solar panel assembly 51, so as to form a heat exchange circulation loop 1; a circulation pump 1 309 and a temperature sensor 1 310 are installed on the heat exchange circulation loop 1;

[0079] One end of the second inlet pipe 303 is connected to the cold medium outlet A of the solar heat exchanger 52, and the other end is connected to the inlet T of the evaporator 41 of the heat pump unit 4; one end of the second outlet pipe 304 is connected to the outlet V of the evaporator 41 of the heat pump unit 4, and the other end is connected to the cold medium inlet H of the solar heat exchanger 52, so as to form a heat exchange circulation loop 2; a circulation pump 2 311, a valve 1 312 and a temperature sensor 2 313 are installed on the heat exchange circulation loop 2;

[0080] One end of the third inlet pipe 305 is connected to the outlet S of the cooling water device 6, and the other end is connected to the inlet T of the evaporator 41 of the heat pump unit 4; one end of the third outlet pipe 306 is connected to the outlet V of the evaporator 41 of the heat pump unit 4, and the other end is connected to the water inlet U of the cooling water device 6 to form a heat exchange circulation loop 3; a circulation pump 314, a valve 2 315 and a temperature sensor 316 are installed on the heat exchange circulation loop 3;

[0081] One end of the fourth inlet pipe 307 is connected to the outlet W of the condenser 42 of the heat pump unit 4, and the other end is connected to the inlet of the ground heat exchange component 1; one end of the fourth outlet pipe 308 is connected to the outlet of the ground heat exchange component 1, and the other end is connected to the inlet X of the condenser 42 of the heat pump unit 4 to form a heat exchange circulation loop four; a circulation pump four 317, a valve three 318 and a temperature sensor four 319 are installed on the heat exchange circulation loop four.

[0082] Circulation pump 1 309 is used to drive the heat exchange medium to circulate in the heat exchange circulation loop 1, so as to circulate the heat energy obtained by the solar panel assembly 51 to the solar heat exchanger 52, and complete the circulation of the heat exchange medium. Circulation pump 2 311 is used to drive the circulating water to circulate in the heat exchange circulation loop 2, so that the circulating water can absorb heat in the solar heat exchanger 52 and become heated circulating water, and the heated circulating water is circulated to the evaporator 41 of the heat pump unit 4 for auxiliary heating; circulation pump 3 314 is used to drive the low-temperature circulating water in the cooling water device 6 to circulate in the heat exchange circulation loop 3, so as to circulate the low-temperature circulating water to the evaporator 41 of the heat pump unit 4 for auxiliary cooling; circulation pump 4 317 is used to drive the circulating water to circulate in the heat exchange circulation loop 4, so as to circulate heat between the condenser 42 of the heat pump unit 4 and the ground heat exchange assembly 1, so as to adjust the temperature of the roadbed and pavement, and achieve the constant temperature of the roadbed and pavement. Temperature sensor one 310, temperature sensor two 313, temperature sensor three 316 and temperature sensor four 319 can collect the temperature of the circulating medium in each circulation loop. According to the temperature conditions, the switching between cooling and heating can be achieved by controlling valve one 312 and valve two 315. Valve three 318 can control the opening and closing of heat exchange circulation loop four.

[0083] Specifically, valve three 318 includes valve three B3182 installed on the fourth inlet pipe 307 and valve three A3181 installed on the fourth outlet pipe 308; the condenser 72, the fourth inlet pipe 307, the ground heat exchange component 1 and the fourth outlet pipe 308 constitute a heat exchange circulation loop four; the circulating water output through the outlet W of the condenser 72 transfers heat to the roadbed and pavement after passing through valve three B3182, and the circulating water returns to the inlet X of the condenser 72 through valve three A3181.

[0084] Specifically, the ground heat exchange assembly 1 includes a shell 11 and a heat dissipation pipe 12 buried under the roadbed 91; wherein the heat dissipation pipe 12 is vertically distributed, which effectively increases the heat exchange area and improves the heating efficiency.

[0085] In some embodiments, the pipeline assembly 3 further includes a connecting pipe 1 320 , a connecting pipe 2 321 , and a connecting pipe 3 322 ;

[0086] One end of the connecting pipe 1 320 is connected to the cold medium outlet P of the solar heat exchanger 52, and the other end is connected to the water inlet Y of the phase change energy storage device 7; one end of the connecting pipe 2 321 is connected to the water inlet Q of the phase change energy storage device 7, and the other end is connected to the water inlet R of the cooling water device 6; one end of the connecting pipe 3 322 is connected to the water inlet U of the phase change energy storage device 7, and the other end is connected to the inlet T of the evaporator 41 of the heat pump unit 4;

[0087] A valve four 323 is installed on the connecting pipe one 320; a valve five 324 and a circulation pump five 325 are installed on the connecting pipe two 321; and a valve six 326 is installed on the connecting pipe three 322.

[0088] The circulating pump 5 325 can drive the heated circulating water after heat exchange in the solar heat exchanger 52 to enter the phase change energy storage device 7 for heat storage. After the circulating water flows out of the phase change energy storage device 7, it will become low-temperature cooling water, which can be stored in the cooling water device 6 for cold supply standby; the circulating pump 5 325 can drive the cooling water in the cooling water device 6 to enter the phase change energy storage device 7 for heat absorption and temperature increase, and transport the heated circulating water to the evaporator 41 of the heat pump unit 4 for auxiliary heating. The heat storage function of the phase change energy storage device 7 can store the excess heat energy generated by the solar device 5 so that it can be released and used when needed; the phase change energy storage device 7 can cool the high-temperature circulating water to supply cold water to the cooling water device 6, thereby improving the storage effect of cold water in the cooling water device 6.

[0089] In some embodiments, the pipeline assembly 3 further includes a connecting pipe 4 327, a connecting pipe 5 328 and a connecting pipe 6 329;

[0090] One end of the connecting pipe 4 327 is connected to the water inlet O of the underground heat exchange device 2, and the other end is connected to the second inlet pipe 303; the valve 1 312 includes a valve 1 A3121, a valve 1 B3122 and a valve 1 C3123; the valve 1 A3121 and the valve 1 B3122 are installed on the second inlet pipe 303 and correspond to the two sides of the other end of the connecting pipe 4 327 one by one; the circulating pump 2 311 is installed on the second inlet pipe 303 and corresponds to the valve 1 A3121 and the cold medium outlet A; the valve 1 C3123 is installed on the second inlet pipe 303;

[0091] One end of the connecting pipe 5 328 is connected to the water inlet L of the underground heat exchange device 2, and the other end is connected between the cold medium inlet H on the second outlet pipe 304 and the corresponding solar heat exchanger 52 and the valve 1 C3123;

[0092] The connecting pipe 4 327 is provided with a valve 7 330; the connecting pipe 5 328 is provided with a valve 8 331 and a circulating pump 6 332;

[0093] The connecting pipe six 329 is connected in parallel to the connecting pipe five 328, and its two ends correspond to the outside of the valve eight 331 and the circulation pump six 332; the connecting pipe six 329 is equipped with a valve nine 333.

[0094] The circulation pump 6 332 can drive the circulation water to circulate in the underground heat exchange device 2, the connecting pipe 4 327, the second inlet pipe 303, the evaporator 41 of the heat pump unit 4, the second outlet pipe 304 and the connecting pipe 5 328, forming a heat exchange circulation loop 5, so as to circulate the constant temperature water in the underground heat exchange device 2 after heat exchange with the ground heat to the evaporator 41 of the heat pump unit 4 for cooling or heating. The circulation pump 2 311 can drive the circulation water to circulate in the underground heat exchange device 2, the connecting pipe 6 329, the solar heat exchanger 52, the second inlet pipe 303 and the connecting pipe 4 327, forming a heat exchange circulation loop 6, so as to transport the heat energy in the solar heat exchanger 52 to the underground heat exchange device 2 through the circulation water, and realize the supplement of heat to the soil at the underground heat exchange device 2, so as to further realize the thermal balance of the soil. The switching between heat exchange circulation loop five and heat exchange circulation loop six can be achieved by controlling the opening and closing of valve one A3121, valve one B3122, valve one C3123, valve seven 330, valve eight 331 and valve nine 333.

[0095] In some embodiments, a controller is also included. The pipeline assembly 3 is equipped with multiple temperature sensors for detecting the temperature of the circulating medium in the pipeline, multiple electrically controlled valves for opening and closing the pipeline, and multiple pump bodies for driving the circulating medium to flow in the pipeline. The controller is electrically connected to the temperature sensor, the electrically controlled valve, the pump body and the heat pump unit 4, and is used to open and close the electrically controlled valve, the pump body and the heat pump unit 4 according to the temperature data received from the temperature sensor, thereby collaboratively controlling the heat exchange between the buried pipe heat exchange device 2, the solar energy device 5, the cooling water device 6 and the phase change energy storage device 7 and the heat pump unit 4, and controlling the heat exchange between the heat pump unit 4 and the ground heat exchange assembly 1.

[0096] The controller coordinates and controls each heat source or cold source to provide auxiliary heating or cooling to the heat pump unit 4 according to the temperature of the circulation loop, which can cope with the changes in ambient temperature throughout the year and is conducive to achieving constant temperature regulation of the roadbed and pavement.

[0097] In some embodiments, the buried pipe 21 of the buried pipe heat exchange device 2 is a plurality of U-shaped bent pipes connected in sequence and distributed vertically on the ground, and the diameter of the buried pipe 21 is smaller than the diameter of the pipeline assembly 3.

[0098] The buried pipe 21 adopts a U-shaped bent pipe distributed vertically on the ground, and the diameter of the buried pipe 21 is relatively small, which makes it easy for the fluid in the pipe to present a turbulent zone, so that the heat exchange effect between the fluid and the inner wall of the pipe is better; the diameter of the pipeline assembly 3 is relatively large, which can reduce the energy consumption of the circulation pump in the circulation loop, and is more energy-saving and environmentally friendly.

[0099] The roadbed and pavement constant temperature system of the present invention can switch to different usage modes according to the changes in seasons and temperature, specifically:

[0100] In spring and autumn, when the ground temperature is moderate, the heat pump unit 7 can be turned off;

[0101] When the incident sunlight is strong, a large amount of heat can be stored in the solar heat exchanger 52 through the operation of the heat exchange circulation loop 1. At this time, the valve 4 323 and the valve 5 324 can be opened, and the circulating water is driven by the circulating pump 5 325 to transport the heat in the solar heat exchanger 52 to the heat preservation box 71 for full contact and heat exchange with the heat storage ball 72, so as to store the heat in the phase change material, thereby reducing the temperature of the circulating water. The cooled circulating water is transported to the cooling water storage tank 62 through the pipeline to form cooling water for storage. Figure 1 , the specific loop path is PQRUFH.

[0102] When the incident sunlight is weak, open valve nine 333, valve one A3121 and valve seven 330, and close all other valves; start circulation pump two 311, drive the cold water in the underground pipe to be transported to the cold medium inlet H of the solar heat exchanger 52 through the pipeline, and after coming out of the cold medium outlet A of the solar heat exchanger 52, it returns to the underground pipe through the pipeline, realizing the flow in the heat exchange circulation loop six, completing the heat storage cycle of the soil; the stored heat can be used for heating in winter when the sunlight is insufficient during the day or at night. Figure 1 The specific circulation route is LGHABO.

[0103] In winter, the heat pump unit 4 is turned on, and there are three heating modes in total; different heating modes are adjusted in real time according to the temperature sensor in the pipeline assembly to meet the constant temperature requirement of the roadbed and pavement.

[0104] Solar device 5 provides heat: start circulating pump 1 309 to drive the heat exchange medium to circulate in heat exchange circulation loop 1; open valve 1 A 3121, valve 1 B 3122 and valve 1 C 3123, start circulating pump 2 311 to drive circulating water to run in heat exchange circulation loop 2. At this time, the loop of solar heating circulating water is ABDTVEH; supply the heat in the solar heat exchanger to the evaporator 41 of the heat pump unit 4 to assist its operation and improve its operating efficiency. At the same time, start the operation of heat exchange circulation loop 4, that is, start circulating pump 4 317, valve 3 A 3181 and valve 3 B 3182, and circulating pump 4 317 drives circulating water to run in heat exchange circulation loop 4, and circulates heat to the ground heat exchange component 1 to adjust the constant temperature of the roadbed 91 and the road surface 92.

[0105] The underground heat exchange device 2 provides heat: open valve eight 331, valve one C 3123, valve one B 3122 and valve seven 330, and open the circulation pump six 332 to drive the circulating water to flow in the heat exchange circulation loop five, so as to circulate the hot water after heat exchange with the ground heat in the underground heat exchange device 2 to the evaporator 41 of the heat pump unit 4 for heating, assist the operation of the heat pump unit 4, and improve its operation efficiency. At this time, the loop of the underground heat supply circulating water is OBDTVEGL. At the same time, start the heat exchange circulation loop four to operate.

[0106] The phase change energy storage device 7 provides heat: open valve five 324, valve six 326 and circulation pump five 325. The circulation pump five 325 drives the circulating cold water in the cooling water storage tank 62 to pass through the heat preservation box 71, and exchanges heat with the internal heat storage ball 72 to heat the circulating water. The heated circulating water enters the inlet T of the evaporator 41 for heat exchange and heating. After the circulating water comes out from the outlet V of the evaporator 41, it returns to the cooling water storage tank 62 through the third outlet pipe 306. At the same time, the heat exchange circulation loop four is started.

[0107] During the heating process of the phase change energy storage device 7, the solar device 5 can be turned on synchronously for heating according to the actual needs of the ambient temperature (extremely low temperature weather) and weather conditions (such as icy road surface), that is, valve 1 A 3121, valve 1 B 3122, valve 1 C 3123 and circulating pump 2 311 are turned on to achieve simultaneous heating of the solar device 5 and the phase change energy storage device 7. The underground heat exchange device 2 can also be turned on synchronously for heating to achieve simultaneous heating of the underground heat exchange device 2 and the phase change energy storage device 7; or, the three heating modes are turned on synchronously to achieve simultaneous heating of the underground heat exchange device 2, the solar device 5 and the phase change energy storage device 7.

[0108] The controller can adjust different heating modes in real time according to the temperature sensor in the pipeline assembly to meet the constant temperature requirements of the roadbed and pavement. By opening different valves, the heating devices can work together. When the required heat is large, the three devices can work together, and when the required heat is small, only one device can work. It is preferred that the phase change energy storage device 7 works to reduce the large-scale use of buried pipes in order to protect the soil environment.

[0109] In summer, the heat pump unit 4 is turned on, and there are three cooling modes. Different cooling modes can be adjusted in real time according to the temperature sensor in the pipeline component 3 to meet the constant temperature requirement of the roadbed and pavement.

[0110] Cooling water device 6 for cooling: open valve two 315 and circulating pump three 314, circulating pump three 314 drives cooling water to circulate in heat exchange circulation loop three to transport cooling water to evaporator 41 of heat pump unit 4 for cooling and cooling, and the circulating water loop for cooling of cooling water device 6 is SCDTVEFU.

[0111] Cooling of underground heat exchange device 2: Open valve eight 331, valve one C 3123, valve one B 3122 and valve seven 330, open circulation pump six 332 to drive circulating water to flow in heat exchange circulation loop five, so as to circulate the cooling water in underground heat exchange device 2 to evaporator 41 of heat pump unit 4 for cooling. The circulating water loop of underground cooling is OBDTVEGL.

[0112] The phase change energy storage device 7 provides cooling: open valve four 323, valve five 324, valve two 315, valve one C3123 and circulating pump five 325; circulating pump five 325 drives circulating water to flow through the heat preservation box 71, where it absorbs heat and is cooled by the heat storage ball 72 to become cooling water, and then flows through the cooling water storage tank 62 to be further cooled, and then is transported to the evaporator 41 through the third inlet pipe 305 for cooling; the circulating water loop for cooling provided by the phase change energy storage device 7 is QRSCDTVEHPY.

[0113] Specifically, each circulation pump installed on each pipeline can be a one-way water delivery pump or a two-way water delivery pump according to needs.

[0114] The present invention adopts a ground source heat pump composed of a compressor, an evaporator, a condenser and a throttle valve. Heat and cold are transferred in a circulation loop formed by the evaporator and the condenser. The heat and cold of the medium are supplied to the roadbed and pavement through the circulation loop, heating the pavement in winter and cooling the pavement in summer.

[0115] The present invention adopts a buried pipe heat exchanger and a solar collector to collect geothermal energy and solar energy, a clean energy, thereby reducing the combustion of fossil fuels and storing energy.

[0116] The present invention uses an insulated box with a phase change energy storage function to store excess energy, release heat in winter, and assist the heat pump unit to avoid the drop in soil temperature caused by extracting a large amount of geothermal energy due to heating needs in winter; at the same time, a drainage collector is used to collect road rainwater, cool the road surface in summer, and assist the ground source heat pump unit in cooling, reducing the impact on the ecological environment.

[0117] The present invention adopts a controller to monitor the temperature of each heat exchange circulation loop in real time, adjust the operating state of the system, and ensure the stability of the road surface and the high efficiency of energy utilization.

[0118] The present invention adopts a multi-valve and multi-pipeline system to work in real time, and controls different heat exchange circulation loops through valves to work, thereby ensuring the convenience of system management.

[0119] The roadbed and pavement constant temperature system of the present invention is a multi-composite ground source heat pump system, which adjusts the operation mode according to different seasons. When operating during the daytime in summer, the circulating medium can be heated by using solar energy through the solar device, and the heat is stored by the phase change energy storage device, so as to provide guarantee for the operation of the heat pump unit in winter. Then the cooling water in the cooling water storage tank is transported to the heat pump unit for refrigeration through the pipeline, and the underground heat exchanger is used to extract the underground cold for roadbed refrigeration. The system makes the soil temperature balanced, and improves the utilization rate of solar energy and the heat supplement effect through the circulating medium design, and the two groups of circulating media will not contact, so as to avoid the influence of hot and cold contact on the heat supplement effect, and uses solar clean energy to supplement the heat for the soil, so as to achieve the effect of energy saving and environmental protection. When operating in winter, the solar heat exchanger and the phase change energy storage insulation box are used as the heat supplement of the ground source heat pump for winter heating, so as to reduce the soil temperature drop caused by the long-term operation of the ground source heat pump, solve the problem of long-term imbalance of hot and cold loads in the use of ground source heat, achieve the heat balance of long-term utilization of soil, and keep the roadbed constant temperature at the same time.

[0120] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0121] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A roadbed and pavement constant temperature system, characterized in that: include: A ground heat exchange component (1), wherein the ground heat exchange component (1) is buried under the road surface and exchanges heat with the roadbed and road surface; A buried pipe heat exchange device (2), wherein the buried pipe heat exchange device (2) is buried underground to exchange heat with soil; Pipeline assembly (3), used for conveying and controlling the heat exchange medium of the system; The heat pump unit (4) is connected to the heat pump unit (4) through the pipeline assembly (3) to serve as a heat source or a cold source for heat exchange; the heat pump unit (4) is connected to the ground heat exchange assembly (1) through the pipeline assembly (3) to transfer heat to the roadbed and pavement to increase the temperature or cool it down; A solar device (5), wherein the solar device (5) is connected to the heat pump unit (4) via the pipeline assembly (3) to serve as a heat source for heat exchange; A cooling water device (6), wherein the cooling water device (6) is connected to the heat pump unit (4) via the pipeline assembly (3) to serve as a cold source for heat exchange; A phase-change energy storage device (7), wherein the phase-change energy storage device (7) is connected to the solar device (5) and the cooling water device (6) via the pipeline assembly (3); the phase-change energy storage device (7) can input hot water in the solar device (5) to perform heat exchange and energy storage, and output cooling water after heat exchange to the cooling water device (6) to perform cold storage; the phase-change energy storage device (7) can input cooling water in the cooling water device (6) to heat the cooling water, and output the heated water to the heat pump unit (4) via the pipeline assembly (3) to perform heat supply; The solar device (5) comprises a solar panel assembly (51) and a solar heat exchanger (52); the solar panel assembly (51) is cyclically connected to the solar heat exchanger (52) via the pipeline assembly (3) to circulate a heat exchange medium; the solar heat exchanger (52) is cyclically connected to the heat pump unit (4) via the pipeline assembly (3) to provide heat; the solar panel assembly (51) is electrically connected to the heat pump unit (4) to provide electrical energy; The cooling water device (6) comprises a drainage collector (61) and a cooling water tank (62) arranged on one side of the roadbed and pavement; the drainage collector (61) is connected to the cooling water tank (62) via the pipeline assembly (3) and can transport the collected ground surface water to the cooling water tank (62) to be used as heat exchange circulation water; the cooling water tank (62) is connected to the heat pump unit (4) via the pipeline assembly (3); and the cooling water tank (62) is connected to the phase change energy storage device (7) via the pipeline assembly (3).

2. A roadbed and pavement constant temperature system according to claim 1, characterized in that: The phase-change energy storage device (7) comprises a heat-insulating box (71) and a heat-storage ball (72) arranged inside the heat-insulating box (71); the solar heat exchanger (52), the heat-insulating box (71) and the cooling water storage tank (62) are connected in sequence through the pipeline assembly (3).

3. A roadbed and pavement constant temperature system according to claim 2, characterized in that: The heat storage ball (72) is a hollow HDPE plastic ball, and a heat storage phase change material is installed inside the ball; the heat storage phase change material is a 36°C heat storage phase change material, comprising sodium hydroxide, sodium chloride and water, with a mass percentage of 30-50% sodium hydroxide, 0-10% sodium chloride and 40-60% water, a phase change latent heat of 240-260 KJ / kg, and a density of 1.45-1.55 kg / l.

4. A roadbed and pavement constant temperature system according to claim 1, characterized in that: The pipeline assembly (3) comprises a first inlet pipe (301), a first outlet pipe (302), a second inlet pipe (303), a second outlet pipe (304), a third inlet pipe (305), a third outlet pipe (306), a fourth inlet pipe (307) and a fourth outlet pipe (308); One end of the first inlet pipe (301) is connected to the heat medium outlet of the solar panel assembly (51), and the other end is connected to the heat medium inlet M of the solar heat exchanger (52); one end of the first outlet pipe (302) is connected to the heat medium outlet N of the solar heat exchanger (52), and the other end is connected to the heat medium inlet of the solar panel assembly (51), so as to form a heat exchange circulation loop 1; a circulation pump 1 (309) and a temperature sensor 1 (310) are installed on the heat exchange circulation loop 1; One end of the second inlet pipe (303) is connected to the cold medium outlet A of the solar heat exchanger (52), and the other end is connected to the inlet T of the evaporator (41) of the heat pump unit (4); one end of the second outlet pipe (304) is connected to the outlet V of the evaporator (41) of the heat pump unit (4), and the other end is connected to the cold medium inlet H of the solar heat exchanger (52), so as to form a second heat exchange circulation loop; a second circulation pump (311), a first valve (312) and a second temperature sensor (313) are installed on the second heat exchange circulation loop; One end of the third inlet pipe (305) is connected to the outlet S of the cooling water device (6), and the other end is connected to the inlet T of the evaporator (41) of the heat pump unit (4); one end of the third outlet pipe (306) is connected to the outlet V of the evaporator (41) of the heat pump unit (4), and the other end is connected to the water inlet U of the cooling water device (6), so as to form a heat exchange circulation loop three; a circulation pump three (314), a valve two (315) and a temperature sensor three (316) are installed on the heat exchange circulation loop three; One end of the fourth inlet pipe (307) is connected to the outlet W of the condenser (42) of the heat pump unit (4), and the other end is connected to the inlet of the ground heat exchange component (1); one end of the fourth outlet pipe (308) is connected to the outlet of the ground heat exchange component (1), and the other end is connected to the inlet X of the condenser (42) of the heat pump unit (4), so as to form a heat exchange circulation loop four; a circulation pump four (317), a valve three (318) and a temperature sensor four (319) are installed on the heat exchange circulation loop four.

5. A roadbed and pavement constant temperature system according to claim 4, characterized in that: The pipeline assembly (3) further comprises a connecting pipe 1 (320), a connecting pipe 2 (321) and a connecting pipe 3 (322); One end of the connecting pipe 1 (320) is connected to the cold medium outlet P of the solar heat exchanger (52), and the other end is connected to the water inlet Y of the phase change energy storage device (7); one end of the connecting pipe 2 (321) is connected to the water inlet Q of the phase change energy storage device (7), and the other end is connected to the water inlet R of the cooling water device (6); one end of the connecting pipe 3 (322) is connected to the water inlet U of the phase change energy storage device (7), and the other end is connected to the inlet T of the evaporator (41) of the heat pump unit (4); The connecting pipe one (320) is installed with a valve four (323); the connecting pipe two (321) is installed with a valve five (324) and a circulation pump five (325); and the connecting pipe three (322) is installed with a valve six (326).

6. A roadbed and pavement constant temperature system according to claim 5, characterized in that: The pipeline assembly (3) further comprises a connecting pipe four (327), a connecting pipe five (328) and a connecting pipe six (329); One end of the connecting pipe four (327) is connected to the water inlet O of the buried pipe heat exchange device (2), and the other end is connected to the second inlet pipe (303); the valve one (312) includes a valve one A (3121), a valve one B (3122) and a valve one C (3123); the valve one A (3121) and the valve one B (3122) are installed on the second inlet pipe (303) and correspond one to one to the two sides of the other end of the connecting pipe four (327); the circulating pump two (311) is installed on the second inlet pipe (303) and corresponds between the valve one A (3121) and the cold medium outlet A; the valve one C (3123) is installed on the second inlet pipe (303); One end of the connecting pipe 5 (328) is connected to the water inlet L of the buried pipe heat exchange device (2), and the other end is connected to the second outlet pipe (304) and corresponds to the cold medium inlet H of the solar heat exchanger (52) and the valve 1 C (3123); The connecting pipe 4 (327) is provided with a valve 7 (330); the connecting pipe 5 (328) is provided with a valve 8 (331) and a circulating pump 6 (332); The connecting pipe six (329) is connected in parallel to the connecting pipe five (328), and its two ends correspond to the outer sides of the valve eight (331) and the circulating pump six (332); the connecting pipe six (329) is provided with a valve nine (333).

7. A roadbed and pavement constant temperature system according to claim 1, characterized in that: The invention also includes a controller, wherein the pipeline assembly (3) is equipped with a plurality of temperature sensors for detecting the temperature of the circulating medium in the pipeline, a plurality of electrically controlled valves for opening and closing the pipeline, and a plurality of pump bodies for driving the circulating medium to flow in the pipeline. The controller is electrically connected to the temperature sensors, the electrically controlled valves, the pump body, and the heat pump unit (4), and is used to open and close the electrically controlled valves, the pump body, and the heat pump unit (4) according to the temperature data received from the temperature sensors, thereby collaboratively controlling the heat exchange between the buried pipe heat exchange device (2), the solar energy device (5), the cooling water device (6), and the phase change energy storage device (7) and the heat pump unit (4), and controlling the heat exchange between the heat pump unit (4) and the ground heat exchange assembly (1).

8. A roadbed and pavement constant temperature system according to claim 1, characterized in that: The buried pipe (21) of the buried pipe heat exchange device (2) is a plurality of U-shaped bent pipes connected in sequence and distributed vertically on the ground, and the pipe diameter of the buried pipe (21) is smaller than the pipe diameter of the pipeline assembly (3).

Images