A radiant air-conditioning system coupled with a constant temperature layer and an air heat pump

Abstract

The present invention provides a radiant air-conditioning system coupled with a constant-temperature layer and an air heat pump, which includes a constant-temperature layer, a filtering device, a system circulation pump, a radiant panel, a radiant panel circulation pump, an air-cooled heat pump unit, a heat recovery fresh air unit, a make-up water pressure stabilizing device, a climate compensation centralized control device and a room. The structure of the present invention is reasonably designed, which saves equipment investment while expanding the scope of use of geothermal energy and improving energy utilization efficiency. In particular, a climate compensation centralized control device is provided, which truly enables the system to adjust the operating state of the system with the change of outdoor temperature and humidity, saves energy, and achieves true energy-saving operation.

Description

Technical Field

[0001] The present invention relates to an air conditioning system, and more particularly to a radiant air conditioning system coupling a constant temperature layer and an air heat pump. Background Art

[0002] Relevant research shows that the temperature of the underground constant temperature layer (including water or soil) is similar to the local annual average temperature. By checking the annual average temperatures of various regions across the country, it is found that except for the relatively low average temperatures in Northeast China, Northwest China, Tibet, and a few individual cities, the average temperature in most regions is around 16°C, and the average temperatures in Guangdong, Guangxi, Hainan, etc. are above 20°C.

[0003] The radiant air conditioning system is a new type of energy-saving air conditioning system with independent temperature and humidity control. Under the cooling condition, the radiant coil uses high-temperature chilled water (16 - 20°C) for cooling, and under the heating condition, the radiant coil uses low-temperature hot water (35 - 45°C) for heating, which has high comfort and is relatively energy-saving. However, although there are many patents on using underground energy for radiant air conditioning systems, none of them use a climate compensation device, and they do not achieve complete energy conservation in control and generally have many drawbacks.

[0004] For example, the ground source heat pump radiant air conditioning system and its fresh air treatment method disclosed in Chinese Patent CN200910304104.0 do not use heat recovery technology, do not fully utilize geothermal energy in winter, and the cooling water temperature of the heat pump increases in summer, reducing the energy efficiency of the unit.

[0005] Another example is a radiant coil and displacement ventilation composite air conditioning system based on a shallow saline water source heat pump disclosed in Chinese Patent CN201620920503.5. It adds an underground submersible pump and a plate heat exchanger. In the cooling mode, although natural cold energy is used, the energy efficiency ratio of the heat pump is reduced, and it is necessary to weigh whether it is really energy-saving, and it also increases the investment cost.

[0006] A rapid-acting radiant air conditioning system disclosed in another Chinese Patent CN201820789883.2 has the energy of its radiant panel coming from the heat exchange of the heat pump, consuming primary energy and having a relatively high equipment investment cost.

[0007] In summary, it is necessary to further improve and perfect the existing technology. Summary of the Invention

[0008] The object of the present invention is to provide a radiant air conditioning system coupling a constant temperature layer and an air heat pump to solve the technical problems such as the existing air conditioning system not fully utilizing natural cold sources due to certain defects in structural design, consuming too much traditional electricity, having a relatively high equipment investment cost, and low energy utilization efficiency.

[0009] To solve the above technical problems, the present invention provides a radiant air-conditioning system coupling a constant-temperature layer and an air heat pump, which includes a constant-temperature layer, a filtering device, a system circulation pump, a radiant panel, a radiant panel circulation pump, an air-cooled heat pump unit, a heat recovery fresh air unit, a makeup water pressure stabilizing device, and a climate compensation centralized control device;

[0010] The constant-temperature layer stores cold energy or heat energy and is internally provided with U-shaped buried pipes; one end of the U-shaped buried pipe is an output pipeline and is provided with the filtering device, and the other end is an input pipeline and is provided with the system circulation pump; the radiant panel is arranged in the room, and a room temperature sensor and a room humidity sensor are also arranged in the room; the air-cooled heat pump unit includes a first air-cooled heat pump unit and a second air-cooled heat pump unit;

[0011] The heat recovery fresh air unit is internally provided with a heat recovery device, a precooling coil, a temperature sensor after the fresh air and return air heat exchange, and a temperature sensor after the heat exchange with groundwater; the second air-cooled heat pump unit is matched and installed inside the heat recovery fresh air unit; a first electric valve is arranged at the input end of the precooling coil; the heat recovery fresh air unit has a fresh air pipe, an exhaust pipe, a supply air pipe, and a return air pipe, the supply air pipe and the return air pipe both extend into the room, and a supply air temperature sensor is arranged on the supply air pipe, and an outdoor air temperature sensor and an outdoor air humidity sensor are arranged on the fresh air pipe;

[0012] The temperature sensor after the fresh air and return air heat exchange is arranged on the supply air pipe after heat exchange by the heat recovery device, and the temperature sensor after the heat exchange with groundwater is arranged on the supply air pipe after heat exchange with the precooling coil;

[0013] Two pipelines are led out from the output end of the filtering device and are respectively matched and connected to the water supply end of the radiant panel and the input end of the precooling coil, and two pipelines are led out from the input end of the system circulation pump and are respectively matched and connected to the water return end of the radiant panel and the output end of the precooling coil; a system water supply temperature sensor, a second electric valve, an electric three-way regulating valve, the first air-cooled heat pump unit, and a radiant panel water supply temperature sensor are sequentially arranged on the pipeline from the output end of the filtering device to the water supply end of the radiant panel; a radiant panel circulation pump, a radiant panel water return temperature sensor, and the makeup water pressure stabilizing device are sequentially arranged on the pipeline from the water return end of the radiant panel to the input end of the system circulation pump; one interface of the electric three-way regulating valve is connected to the pipeline between the makeup water pressure stabilizing device and the radiant panel water return temperature sensor;

[0014] The climate compensation centralized control device is respectively connected to the make-up water constant pressure device, the system circulation pump, the first electric valve, the system water supply temperature sensor, the second electric valve, the electric three-way regulating valve, the radiant panel return water temperature sensor, the outdoor air temperature sensor, the outdoor air humidity sensor, the temperature sensor after fresh air and return air heat exchange, the temperature sensor after heat exchange with groundwater, the supply air temperature sensor, the first air-cooled heat pump unit, the radiant panel circulation pump, the radiant panel water supply temperature sensor, the second air-cooled heat pump unit, the room temperature sensor and the room humidity sensor.

[0015] The radiant air-conditioning system with a constant temperature layer coupled to an air heat pump, wherein: the climate compensation centralized control device adopts a PLC or DDC controller.

[0016] The radiant air-conditioning system with a constant temperature layer coupled to an air heat pump, wherein: the water supply end of the radiant panel is connected to the output end of the filtering device through a radiant panel water supply pipe in a matching manner, and the return water end of the radiant panel is connected to the input end of the system circulation pump through a radiant panel return water pipe in a matching manner.

[0017] The radiant air-conditioning system with a constant temperature layer coupled to an air heat pump, wherein: the radiant panel circulation pump is installed on the radiant panel return water pipe in a matching manner; and the input end of the radiant panel circulation pump is connected to the radiant panel return water pipe, and the output end of the radiant panel circulation pump is connected to the input end of the system circulation pump through a system return water pipe in a matching manner.

[0018] The radiant air-conditioning system with a constant temperature layer coupled to an air heat pump, wherein: the make-up water constant pressure device and the radiant panel return water temperature sensor are arranged on the system return water pipe in a matching manner.

[0019] The radiant air-conditioning system with a constant temperature layer coupled to an air heat pump, wherein: both the input end and the output end of the pre-cooling coil extend outwards from the heat recovery fresh air unit, and the extended ends are connected with fresh air pre-cooling water pipes; the input end of the pre-cooling coil is connected to the input end of the system circulation pump through the fresh air pre-cooling water pipe, and the output end of the pre-cooling coil is connected to the radiant panel water supply pipe located between the system water supply temperature sensor and the second electric valve through a fresh air pre-cooling water pipe.

[0020] The radiant air-conditioning system with a constant temperature layer coupled to an air heat pump, wherein: the first electric valve is arranged on the fresh air pre-cooling water pipe located at the input end of the pre-cooling coil in a matching manner.

[0021] Adopting the above technical solution, the present invention has the following beneficial effects:

[0022] The structure design of the radiant air-conditioning system coupling the constant temperature layer and the air heat pump of the present invention is reasonable. Through the buried pipe technology, the energy stored in the constant temperature layer is directly used and directly supplied to the radiant panel, saving the consumption of electric energy. In addition, by setting up a branch road heat recovery fresh air unit, the use range of geothermal energy is expanded, the energy utilization efficiency is improved, and the equipment investment cost is saved. In particular, the whole system is equipped with a climate compensation centralized control device, which can truly adjust the operating state of the unit according to the changes of outdoor temperature and humidity, save energy, and achieve true energy-saving operation.

[0023] The radiant air-conditioning system coupling the constant temperature layer and the air heat pump of the present invention uses U-shaped buried pipes to transfer the energy stored in the constant temperature layer through water, which is divided into two paths. One path is directly used for the radiant panel in the room to bear the indoor sensible heat load. At the same time, a mixing water device (consisting of a system water supply temperature sensor t1, a second electric valve F2, an electric three-way regulating valve F3, a radiant panel water supply temperature sensor t2, a radiant panel return water temperature sensor t4 and corresponding pipelines) and a first air-cooled heat pump unit for winter use are arranged on this path. The other path is used for the heat recovery fresh air unit. After the fresh air and the indoor return air are heat-exchanged, the fresh air is further cooled or heated and then returned to the buried U-shaped pipe to continue heat exchange with the constant temperature layer. The pre-treated fresh air determines whether to start the first air-cooled heat pump unit for further heat and moisture treatment according to the indoor temperature and humidity requirements. The whole system is equipped with a climate compensation centralized control device, which monitors the indoor and outdoor temperature and humidity, adjusts the water supply temperature and flow rate of the radiant panel according to the set indoor temperature and humidity, and controls the operating state of the heat recovery fresh air unit at the same time to meet the indoor temperature and humidity, minimize the energy consumption of the whole system, and truly achieve intelligent control, energy saving, and improve the utilization efficiency of low-grade energy. Brief Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0025] Figure 1 It is the schematic diagram of the radiant air-conditioning system coupling the constant temperature layer and the air heat pump provided by the embodiment of the present invention.

[0026] Reference Signs:

[0027] 1 - Constant temperature layer, 2 - Filter device, 3 - System circulation pump, 4 - Radiation panel, 5 - Radiation panel circulation pump, 6 - Air-cooled heat pump unit, 61 - First air-cooled heat pump unit, 62 - Second air-cooled heat pump unit, 7 - Heat recovery fresh air unit, 71 - Pre-cooling coil, 8 - Make-up water pressure stabilizing device, 9 - Climate compensation centralized control device, and 10 - Room, G1 - Buried U-shaped pipe, G2 - Radiation panel water supply pipe, G3 - Fresh air pre-cooling water pipe, G4 - Radiation panel return water pipe, G5 - System return water pipe, F1 - First electric valve, F2 - Second electric valve, F3 - Electric three-way regulating valve, H1 - Room humidity sensor, H2 - Outdoor air humidity sensor, t1 - System water supply temperature sensor, t2 - Radiation panel water supply temperature sensor, t3 - Room temperature sensor, t4 - Radiation panel return water temperature sensor, t5 - Outdoor air temperature sensor, t6 - Temperature sensor after heat exchange between fresh air and return air, t7 - Temperature sensor after heat exchange with groundwater, t8 - Supply air temperature sensor. Detailed implementation manners

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] The present invention will be further explained and described below in combination with specific implementation manners.

[0032] As Figure 1As shown in the figure, the radiant air conditioning system coupling the constant temperature layer and the air heat pump provided in this embodiment includes a constant temperature layer 1, a filtering device 2, a system circulation pump 3, a radiant panel 4, a radiant panel circulation pump 5, an air-cooled heat pump unit 6, a heat recovery fresh air unit 7, a make-up water and pressure stabilizing device 8, and a climate compensation centralized control device 9.

[0033] The constant temperature layer 1 (referring to the soil source or water source at a depth of 30 - 50 m underground) stores cold energy or heat energy and has U-shaped buried pipes G1 buried inside; both ends of the U-shaped buried pipes G1 extend outwards from the constant temperature layer 1, and one end is the output pipeline, and the other end is the input pipeline.

[0034] The filtering device 2 is fitted and installed on the output pipeline of the U-shaped buried pipes G1.

[0035] The system circulation pump 3 is fitted and installed on the input pipeline of the U-shaped buried pipes G1.

[0036] The radiant panel 4 is arranged in the room 10, and a room temperature sensor t3 and a room humidity sensor H1 are arranged in the room 10; the radiant panel 4 is connected to the output end of the filtering device 2 through a radiant panel supply pipe G2 in a matching manner, and is connected to the input end of the system circulation pump 3 through a radiant panel return pipe G4 in a matching manner.

[0037] The radiant panel circulation pump 5 is fitted and installed on the radiant panel return pipe G4 of the radiant panel 4; among them, the input end of the radiant panel circulation pump 5 is connected to the radiant panel return pipe G4 of the radiant panel 4, and the output end of the radiant panel circulation pump 5 is connected to the input end of the system circulation pump 3 through a system return pipe G5 in a matching manner; a radiant panel return water temperature sensor t4 is also fitted and installed on the system return pipe G5 at the output end of the radiant panel circulation pump 5.

[0038] The air-cooled heat pump unit 6 includes a first air-cooled heat pump unit 61 and a second air-cooled heat pump unit 62; the first air-cooled heat pump unit 61 is installed on the radiation panel water supply pipe G2 in a matching manner, and the second air-cooled heat pump unit 62 is installed inside the heat recovery fresh air unit 7 in a matching manner. Among them, a radiation panel water supply temperature sensor t2 is also installed on the radiation panel water supply pipe G2 between the first air-cooled heat pump unit 61 and the radiation panel 4 in a matching manner; an electric three-way regulating valve F3, a second electric valve F2, and a system water supply temperature sensor t1 are sequentially installed on the radiation panel water supply pipe G2 from the first air-cooled heat pump unit 61 to the output end of the filtering device 2 in a matching manner; one end of the electric three-way regulating valve F3 is connected to the radiation panel 4 through the radiation panel water supply pipe G2, the other end is connected to one end of the second electric valve F2 through the radiation panel water supply pipe G2, and the remaining end is connected to the system return pipe G5 between the output end of the radiation panel circulation pump 5 and the system circulation pump 3; the other end of the second electric valve F2 is connected to the output end of the filtering device 2 through the radiation panel water supply pipe G2, and a system water supply temperature sensor t1 is also installed on the radiation panel water supply pipe G2 between the other end of the second electric valve F2 and the output end of the filtering device 2 in a matching manner.

[0039] The heat recovery fresh air unit 7 is a direct expansion heat recovery fresh air unit, which has a fresh air pipe, an exhaust pipe, a supply air pipe, and a return air pipe; an outdoor air temperature sensor t5 and an outdoor air humidity sensor H2 are sequentially installed on the fresh air pipe of the heat recovery fresh air unit 7 in a matching manner.

[0040] Both the supply air pipe and the return air pipe of the heat recovery fresh air unit 7 extend into the room 10; a temperature sensor t6 after heat exchange between fresh air and return air and a temperature sensor t7 after heat exchange with groundwater are arranged inside the heat recovery fresh air unit 7; a supply air temperature sensor t8 is also installed on the supply air pipe of the heat recovery fresh air unit 7 in a matching manner.

[0041] A precooling coil 71 and a heat recovery device are arranged inside the heat recovery fresh air unit 7 in a matching manner; among them, the temperature sensor t6 after heat exchange between fresh air and return air is arranged on the supply air pipe after heat exchange by the heat recovery device, and the temperature sensor t7 after heat exchange with groundwater is arranged on the supply air pipe after heat exchange with the precooling coil 71.

[0042] Both ends (i.e., the input end and the output end) of the precooling coil 71 extend outwards from the heat recovery fresh air unit 7, and the extending ends are connected with a fresh air precooling water pipe G3; the input end of the precooling coil 71 is connected to the input end of the system circulation pump 3 through the fresh air precooling water pipe G3, and the output end of the precooling coil 71 is connected to the radiation panel water supply pipe G2 between the t1-system water supply temperature sensor and the second electric valve F2 through the fresh air precooling water pipe G3; among them, a first electric valve F1 is also installed on the fresh air precooling water pipe G3 at the other end of the precooling coil 71 in a matching manner.

[0043] The water replenishing and pressure stabilizing device 8 is connected to the system return water pipe G5 at the output end of the system circulating pump 3.

[0044] The control logic of the climate compensation centralized control device 9 is a multi-stage series automatic control logic, and specifically uses a PLC or DDC controller to determine the optimal operating state according to the indoor and outdoor temperature and humidity at all times. Among them, the climate compensation centralized control device 9 is electrically connected to the water replenishing and pressure stabilizing device 8 through the control line X1, electrically connected to the system circulating pump 3 through the control line X2, electrically connected to the first electric valve F1 through the control line X3, electrically connected to the system water supply temperature sensor t1 through the control line X4, electrically connected to the second electric valve F2 through the control line X5, electrically connected to the electric three-way regulating valve F3 through the control line X6, electrically connected to the radiant panel return water temperature sensor t4 through the control line X7, electrically connected to the outdoor air temperature sensor t5 through the control line X8, electrically connected to the outdoor air humidity sensor H2 through the control line X9, electrically connected to the temperature sensor t6 after the fresh air and return air heat exchange through the control line X10, electrically connected to the temperature sensor t7 after the heat exchange with groundwater through the control line X11, electrically connected to the supply air temperature sensor t8 through the control line X12, electrically connected to the first air-cooled heat pump unit 61 through the control line X13, electrically connected to the radiant panel circulating pump 5 through the control line X14, electrically connected to the radiant panel water supply temperature sensor t2 through the control line X15, electrically connected to the second air-cooled heat pump unit 62 through the control line X16, electrically connected to the room temperature sensor t3 through the control line X17, and electrically connected to the room humidity sensor H1 through the control line X18.

[0045] The system water supply temperature sensor t1, the second electric valve F2, the electric three-way regulating valve F3, the radiant panel water supply temperature sensor t2, the radiant panel return water temperature sensor t4 and the corresponding pipelines form a mixing device.

[0046] The working principle of the present invention:

[0047] Summer: The cold energy of the constant temperature layer is used by the system after heat exchange through the U-shaped buried pipe G1, and one way is for the radiant panel. At this time, the first air-cooled heat pump unit 61 does not work. The climate compensation centralized control device 9 calculates the dew point temperature of the room 10 according to the temperature and humidity in the room 10, and adjusts the opening degrees of the second electric valve F2 and the electric three-way regulating valve F3 through the temperatures of the system water supply temperature sensor t1 and the radiant panel return water temperature sensor t4, so that the temperature of the radiant panel water supply temperature sensor t2 is always at least 0.5 °C higher than the dew point temperature of the room 10, ensuring that the radiant panel 4 does not condense. The other way is for the heat recovery fresh air unit 7. At this time, the second air-cooled heat pump unit 62 is in standby state. At the same time, it is necessary to compare the temperature of the temperature sensor t6 after the fresh air and the return air heat exchange with the temperature of the system water supply temperature sensor t1. If the temperature of t6 > the temperature of t1, the first electric valve F1 is opened, otherwise, the first electric valve F1 is closed; compare the temperature of the temperature sensor t7 after heat exchange with the groundwater with the temperature of the supply air temperature sensor t8. If the temperature of t7 > the temperature of t8, the second air-cooled heat pump unit 62 is started. If the temperature of t7 = the temperature of t8, the second air-cooled heat pump unit 62 is in standby; if the temperature of t7 < the temperature of t8, the second air-cooled heat pump unit 62 is in standby, and at the same time, the first electric valve F1 is adjusted to reduce the flow rate, so that the temperature of the temperature sensor t7 after heat exchange with the groundwater is close to the temperature of the supply air temperature sensor t8. During this process, the climate compensation centralized control device 9 monitors the outdoor temperature and humidity and the temperature and humidity in the room 10 at all times, and adjusts the relevant equipment to make the system operate stably and efficiently, improving the comfort of the room 10 and reducing the system energy consumption under the condition of meeting the set temperature and humidity.

[0048] Winter: The return water in the electric three-way regulating valve F3 is closed. The climate compensation centralized control device 9 calculates the temperature of the radiant panel water supply temperature sensor t2 required according to the set temperature and humidity. At this time, the first air-cooled heat pump unit 61 is in standby state. If the temperature of t1 < the temperature of t2, the first air-cooled heat pump unit 61 is started. If the temperature of t1 = the temperature of t2, the first air-cooled heat pump unit 61 is in standby; in winter, the temperature of the system water supply temperature sensor t1 will not be greater than the temperature of the radiant panel water supply temperature sensor t2 (except when using geothermal energy and the temperature of the system water supply temperature sensor t1 can reach above 30 °C in winter). The operation of the heat recovery fresh air unit 7, the flow rate in the precooling coil 71 runs to the maximum, and determines the temperature value of t8 according to the coupling situation of the radiant panel 4 and the fresh air in the room, and determines the operation state of the second air-cooled heat pump unit 62 according to the temperature of t7; during the whole process, the fresh air volume in winter can be appropriately reduced, and the radiant panel is preferably used; a humidifying section can be configured in the heat recovery fresh air unit 7 according to requirements.

[0049] Transition season: Both the first air-cooled heat pump unit 61 and the second air-cooled heat pump unit 62 are turned off. Compare the temperature of the outdoor air temperature sensor t5 with the temperature of the room temperature sensor t3. Preferentially use the fresh air unit to meet the indoor temperature and preferentially use the thermal energy of the constant temperature layer. In other cases, according to the monitoring and control of the climate compensation centralized control device 9, determine whether the system starts the summer or winter mode.

[0050] The control principle of the climate compensation centralized control device 9 is as follows:

[0051] A building model and a load calculation software are embedded in the climate compensation centralized control device 9 (this load calculation software is an existing conventional air-conditioning load calculation software, such as Hongye load calculation software, DEST load calculation software, equest load calculation software, etc.). The load calculation software in the climate compensation centralized control device 9 will automatically calculate and generate an hourly load diagram according to the set temperature and humidity in the room and the temperature and humidity outdoors, providing prediction and judgment for the subsequent operation mode; after setting the temperature of t3 and the humidity of H1 indoors, the moisture content d1 in this set state is determined; the temperature of t5 and the humidity of H2 of the outdoor air are transmitted to the climate compensation centralized control device 9, and the moisture content d2 of the outdoor air can be determined. The climate compensation centralized control device 9 will compare the temperature of t3 and the moisture content d1 and the temperature of t5 and the moisture content d2 to determine the specific operation mode.

[0052] When the temperature of t5 ≥ the temperature of t3 and the moisture content d2 ≥ the moisture content d1, the system enters the summer cooling mode. At this time, both the sensible heat load and the latent heat load of the room are calculated by the climate compensation central control device 9. The fresh air of the heat recovery fresh air unit 7 undertakes all the latent heat load and 20% of the sensible heat load of the room, and the remaining sensible heat load is all borne by the radiation panel 4. The climate compensation central control device 9 determines the dew point temperature of the room according to the temperature of t3 and the humidity of H1. To ensure that the room does not condense, the temperature of t2 needs to be at least 0.5°C higher than the dew point temperature of the room, and then the temperature of t2 is determined. Generally, considering a supply and return water temperature difference of 3 - 5°C, the temperature of t4 is also determined. According to the sensible heat load borne by the radiation panel 4 and the supply and return water temperature difference of 3 - 5°C, the circulation flow rate of the radiation panel circulating pump 5 is also determined. At this time, the climate compensation central control device 9 controls the mixing water device and adjusts the valve opening of F3 according to the temperature of t1 to make the temperature of t2 reach the required temperature and remain stable. At the same time, the climate compensation central control device 9 determines the temperature value of t8 according to the fresh air volume of the heat recovery fresh air unit 7 (the optimal fresh air volume required by the room) and all the latent heat load and 20% of the sensible heat load borne by the room. At this time, the temperature of t6 will also be determined according to the heat recovery efficiency of the heat recovery fresh air unit 7. The temperatures of t8 and t6 are both fed back to the climate compensation central control device 9. The climate compensation central control device 9 controls the opening of F1 and the water volume of the system circulating pump 3 according to the temperature of t1, and adjusts the heat exchange amount of the pre-cooling coil 71 to make the temperature of t7 close to the temperature of t8. When the opening of F1 reaches the maximum and the temperature of t7 still does not approach the temperature of t8, the second air-cooled heat pump unit 62 is started to make the supply air temperature reach the temperature of t8.

[0053] When the temperature of t5 ≥ the temperature of t3 and the moisture content d2 < the moisture content d1, it is still in the summer cooling mode. At this time, the second air-cooled heat pump unit 62 must be in the off state. The climate compensation central control device 9 still executes the summer operation mode, and the wet load of the room is still fully borne by the fresh air of the heat recovery fresh air unit 7 (the optimal fresh air volume required by the room). However, the distribution ratio of the fresh air of the heat recovery fresh air unit 7 and the sensible heat load of the room by the radiation panel 4 is not fixed at this time, and the climate compensation central control device 9 will adjust the corresponding distribution ratio according to the specific situation.

[0054] When the temperature of t5 < the temperature of t3 and the moisture content d2 ≥ the moisture content d1, the dehumidification mode is entered. At this time, the climate compensation centralized control device 9 will determine the working state of the radiation panel 4 according to the sensible heat load and latent heat load of the room. If the fresh air handling unit with heat recovery 7, when meeting the dehumidification requirements of the room, the sensible heat load it undertakes is greater than or equal to the sensible heat load required by the room, then at this time the radiation panel 4 and the precooling coil 71 are completely closed, and the state of the second air-cooled heat pump unit 62 is adjusted so that the fresh air (the optimal fresh air volume required by the room), when meeting the dehumidification requirements, the sensible heat load it undertakes is exactly equal to the sensible heat load required by the room. If the fresh air handling unit with heat recovery 7, when meeting the dehumidification requirements of the room, the sensible heat load it undertakes is less than the sensible heat load required by the room, the remaining sensible heat load of the room is borne by the radiation panel 4, and both the radiation panel 4 and the precooling coil 71 operate, and the operation mode is the same as in summer.

[0055] When 20°C ≤ the temperature of t5 < the temperature of t3 and the moisture content d2 < the moisture content d1, the transition season is entered; the climate compensation centralized control device 9 determines the operation state according to the room load situation; at this time, the fresh air handling unit with heat recovery 7 should be in the state of operating with the maximum fresh air volume; and the second air-cooled heat pump unit 62 must be closed; if the precooling coil 71 has also operated to the maximum flow rate and the sensible heat load of the fresh air for the room still cannot meet the sensible heat load demand of the room, the radiation panel 4 operates, and the operation mode is the same as in summer; if the precooling coil 71 operates to the maximum flow rate and the sensible heat load of the fresh air for the room is less than or equal to the sensible heat load demand of the room, the radiation panel 4 is closed, and the flow rate of the precooling coil 71 is adjusted to make the fresh air volume operate between the optimal fresh air volume and the maximum fresh air volume.

[0056] When the temperature of t5 ≤ 10°C and the moisture content d2 < the moisture content d1, the general system enters the winter mode; that is, the room has a heating load demand; a humidifying section can be set in the heat recovery fresh air unit 7 to meet the humidifying demand. The fresh air is in the minimum fresh air volume state. The climate compensation centralized control device 9 controls the pre-cooling coil 71 to be in the maximum operating flow rate, and determines the operating states of the first air-cooled heat pump unit 61 and the second air-cooled heat pump unit 62, as well as the operating state of the mixing water device according to the room load situation and the coupling with the heating load borne by the radiation panel 4; the return water in the electric three-way regulating valve F3 is closed; the climate compensation centralized control device 9 calculates the temperature of the radiation panel water supply temperature sensor t2 required according to the set temperature and humidity. At this time, the first air-cooled heat pump unit 61 is in the standby state. If the temperature of t1 < the temperature of t2, the first air-cooled heat pump unit 61 is started; if the temperature of t1 = the temperature of t2, the first air-cooled heat pump unit 61 is in standby; the temperature of the winter system water supply temperature sensor t1 will not be greater than the temperature of the radiation panel water supply temperature sensor t2 (except when using geothermal energy and the temperature of the winter system water supply temperature sensor t1 can reach above 30°C); at this time, the temperature of t6 will also be determined according to the heat recovery efficiency of the heat recovery fresh air unit 7. According to the coupling situation of the fresh air and the radiation panel 4 in the room, the temperature value of t8 is determined. The temperature values of t8 and t6 are both fed back to the climate compensation centralized control device 9. At the same time, the climate compensation centralized control device 9 determines the operating state of the second air-cooled heat pump unit 62 according to the fresh air volume of 7 (the minimum fresh air volume required by the room) and the temperature of t7 when the pre-cooling coil 71 is in the maximum operating flow rate; if the temperature of t7 cannot reach the temperature of t8, the second air-cooled heat pump unit 62 operates, otherwise the second air-cooled heat pump unit 62 does not operate.

[0057] The structure design of the present invention is simple. Through the ground buried pipe technology, the energy stored in the constant temperature layer is directly used and directly supplied to the radiation panel for use. In addition, a branch path is set for the heat recovery fresh air unit to use, expanding the application range of geothermal energy and improving the energy utilization efficiency; in addition, a climate compensation centralized control device is set in the whole system, truly enabling the unit to adjust the operating state of the unit with the change of outdoor temperature and humidity, and saving energy.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A radiant air-conditioning system coupled with a constant-temperature layer and an air heat pump, characterized in that: The described radiant air conditioning system includes a constant temperature layer, a filtering device, a system circulation pump, a radiant panel, a radiant panel circulation pump, an air-cooled heat pump unit, a heat recovery fresh air unit, a makeup water pressure stabilizing device, and a climate compensation centralized control device; The constant temperature layer is internally provided with U-shaped buried pipes; one end of the U-shaped buried pipes is an output pipeline and is provided with the filtering device, and the other end is an input pipeline and is provided with the system circulation pump; the radiant panel is arranged in the room, and a room temperature sensor and a room humidity sensor are also arranged in the room; the air-cooled heat pump unit includes a first air-cooled heat pump unit and a second air-cooled heat pump unit; The heat recovery fresh air unit is internally provided with a heat recovery device, a pre-cooling coil, a temperature sensor after fresh air and return air heat exchange, and a temperature sensor after heat exchange with groundwater; the second air-cooled heat pump unit is matched and installed inside the heat recovery fresh air unit; a first electric valve is arranged at the input end of the pre-cooling coil; the heat recovery fresh air unit has a fresh air pipe, an exhaust pipe, a supply air pipe, and a return air pipe, the supply air pipe and the return air pipe both extend into the room, and a supply air temperature sensor is arranged on the supply air pipe, and an outdoor air temperature sensor and an outdoor air humidity sensor are arranged on the fresh air pipe; The temperature sensor after fresh air and return air heat exchange is arranged on the supply air pipe after heat exchange by the heat recovery device, and the temperature sensor after heat exchange with groundwater is arranged on the supply air pipe after heat exchange with the pre-cooling coil; Two pipelines are led out from the output end of the filtering device and are respectively matched and connected to the water supply end of the radiant panel and the input end of the pre-cooling coil, and two pipelines are led out from the input end of the system circulation pump and are respectively matched and connected to the water return end of the radiant panel and the output end of the pre-cooling coil; on the pipeline from the output end of the filtering device to the water supply end of the radiant panel, a system water supply temperature sensor, a second electric valve, an electric three-way regulating valve, the first air-cooled heat pump unit, and a radiant panel water supply temperature sensor are sequentially arranged; on the pipeline from the water return end of the radiant panel to the input end of the system circulation pump, the radiant panel circulation pump, a radiant panel water return temperature sensor, and the makeup water pressure stabilizing device are sequentially arranged; one interface of the electric three-way regulating valve is connected to the pipeline between the makeup water pressure stabilizing device and the radiant panel water return temperature sensor; The climate compensation centralized control device is respectively connected to the makeup water pressure stabilizing device, the system circulation pump, the first electric valve, the system water supply temperature sensor, the second electric valve, the electric three-way regulating valve, the radiant panel water return temperature sensor, the outdoor air temperature sensor, the outdoor air humidity sensor, the temperature sensor after fresh air and return air heat exchange, the temperature sensor after heat exchange with groundwater, the supply air temperature sensor, the first air-cooled heat pump unit, the radiant panel circulation pump, the radiant panel water supply temperature sensor, the second air-cooled heat pump unit, the room temperature sensor, and the room humidity sensor.

2. The radiant air-conditioning system with the coupling of a constant-temperature layer and an air heat pump according to claim 1, wherein: The climate compensation centralized control device adopts a PLC or DDC controller.

3. The radiant air-conditioning system with the coupling of the constant-temperature layer and the air heat pump according to claim 1, characterized in that: The water supply end of the radiation panel is connected to the output end of the filtration device through a radiation panel water supply pipe, and the water return end of the radiation panel is connected to the input end of the system circulation pump through a radiation panel water return pipe.

4. The radiant air-conditioning system with the coupling of the constant-temperature layer and the air heat pump according to claim 3, characterized in that: The radiation panel circulation pump is installed on the radiation panel water return pipe; and the input end of the radiation panel circulation pump is connected to the radiation panel water return pipe, and the output end of the radiation panel circulation pump is connected to the input end of the system circulation pump through a system water return pipe.

5. The radiant air-conditioning system with a constant-temperature layer coupled to an air heat pump according to claim 4, wherein: The makeup water pressure stabilizing device and the radiation panel return water temperature sensor are arranged on the system water return pipe.

6. The radiant air-conditioning system with coupling of a constant-temperature layer and an air heat pump according to claim 3, wherein: Both the input end and the output end of the precooling coil extend outwards from the heat recovery fresh air unit, and the extended ends are connected with a fresh air precooling water pipe; the input end of the precooling coil is connected to the input end of the system circulation pump through the fresh air precooling water pipe, and the output end of the precooling coil is connected to the radiation panel water supply pipe located between the system water supply temperature sensor and the second electric valve through the fresh air precooling water pipe.

7. The radiant air-conditioning system with the coupling of the constant-temperature layer and the air heat pump according to claim 6, wherein: The first electric valve is arranged on the fresh air precooling water pipe at the input end of the precooling coil.

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