Botanical garden greenhouse temperature and humidity adjusting system based on urban central heating

Abstract

The invention relates to the field of greenhouse adjustment. A botanical garden greenhouse temperature and humidity adjusting system based on urban centralized heating comprises a botanical garden greenhouse, a heat supply pipe network water inlet pipe 1 and a heat supply pipe network water return pipe 2, wherein the heat supply pipe network water inlet pipe 1 and the heat supply pipe network water return pipe 2 extend into the botanical garden greenhouse. The first heat exchanger 3, the second heat exchanger 4, the external water supply 5, the water pump 6, the heat preservation water tank 7, the irrigation spraying device 8, the air feeder 9, the bubbling humidifier 10, the humidity sensor 15, the first temperature sensor 14 and the second temperature sensor 13 are installed in the botanical garden greenhouse, and a discharge outlet 12 is formed in the lower portion of the botanical garden greenhouse. According to the system, heat energy is provided for the botanical garden greenhouse through centralized heat supply, so that the system can meet the plant environment growth requirements in autumn, winter and spring in the north, the humidity and temperature can be adjusted, the requirements of plants in the botanical garden greenhouse for different growth environments are met, meanwhile, the heat utilization rate is high, and the manual requirements are reduced through overall automatic control.

Description

Technical Field

[0001] The invention relates to the field of greenhouse regulation. Background Art

[0002] In the botanical gardens where tropical plants are displayed and cultivated in winter, a warm and humid environment simulating a tropical rainforest is used to ensure the healthy growth of plants. Traditional greenhouse temperature and humidity control systems generally rely on independent heating and humidification equipment, such as electric heaters, fuel / gas boilers and steam humidifiers. However, such systems have high energy consumption, high operating costs, limited environmental adaptability, and a large contribution to greenhouse gas emissions. Especially in the severe cold of winter, the stability of the greenhouse environment faces severe challenges.

[0003] In recent years, with the widespread implementation and technological innovation of urban centralized heating systems, the use of urban heating network resources as greenhouse heat sources has become a reality. Centralized heating technology not only greatly improves energy efficiency, reduces operating costs, and reduces greenhouse gas emissions, but also significantly enhances the environmental adaptability of the system, providing an efficient, economical, and environmentally friendly solution for the stable growth of tropical plants in non-tropical areas.

[0004] However, in the prior art, the greenhouse of the botanical garden is generally directly heated by a centralized heating system, which has low heating efficiency and requires the installation of a large number of radiators to meet the greenhouse needs. In addition, an independent irrigation system is also required for humidity adjustment and irrigation inside the greenhouse of the botanical garden. The overall problem is low heat utilization and high energy consumption. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to provide a temperature and humidity control system for a botanical garden greenhouse based on urban centralized heating to efficiently utilize the heat energy of urban centralized heating.

[0006] The technical solution adopted by the present invention is: a botanical garden greenhouse temperature and humidity control system based on urban centralized heating, including a botanical garden greenhouse, a heating network water inlet pipe 1 and a heating network return pipe 2 extending into the inside of the botanical garden greenhouse, a first heat exchanger 3, a second heat exchanger 4, an external water supply 5, a water pump 6, an insulation water tank 7, an irrigation sprinkler device 8, a blower 9, a bubbling humidifier 10, a humidity sensor 15, a first temperature sensor 14, and a second temperature sensor 13 installed inside the botanical garden greenhouse, and a discharge port 12 is provided at the bottom of the botanical garden greenhouse. The water supply pipe 1 of the heating network is connected to the heat medium channel of the second heat exchanger 4 and the heat medium channel of the first heat exchanger 3 in series in sequence through the fifth valve 20, and then connected to the return water pipe 2 of the heating network through the first valve 16. The air outside the greenhouse of the botanical garden enters the cold medium channel of the second heat exchanger 4 through the air supply fan 9 and the sixth valve 21. The heated air coming out of the cold medium channel of the second heat exchanger 4 is divided into two branches. One branch directly enters the greenhouse of the botanical garden to heat the air in the greenhouse of the botanical garden, and the other branch enters the bubbling humidifier after passing through the pipeline with the humidity regulating valve 11. 10. The water vapor and air coming out of the bubbling humidifier 10 directly enter the greenhouse of the botanical garden; the external water supply 5 is divided into two branches, one branch is connected to the bubbling humidifier 10 through a pipeline with a third valve 18 to provide water for the bubbling humidifier 10, and the other branch is connected to the cold medium inlet of the first temperature sensor 14 through a pipeline with a second valve 17. The cold medium outlet of the first temperature sensor 14 is connected to the insulated water tank 7. The insulated water tank 7 is connected to the cold medium inlet of the first temperature sensor 14 through a pipeline with a water pump 6. The insulated water tank 7 is connected to the irrigation sprinkler 8 through a pipeline with a fourth valve 19.

[0007] The water temperature of the water pipe 1 of the heating network is 70-90°C, the outlet temperature of the heat medium channel of the second temperature sensor 13 is 30-50°C, and the outlet temperature of the heat medium channel of the first heat exchanger 3 is 20-30°C.

[0008] It also includes a control system, wherein the water pump 6, the air blower 9, the humidity sensor 15, the first temperature sensor 14, the second temperature sensor 13, the humidity regulating valve 11, the first valve 16, the second valve 17, the third valve 18, the fourth valve 19, the fifth valve 20, and the sixth valve 21 are all connected to the control system by electrical signals. During use, the control system obtains the temperature in the greenhouse of the botanical garden in real time through the second temperature sensor 13. If the temperature is greater than the maximum value of the room temperature setting interval, the sixth valve 21 is kept closed, the air blower 9 is not started, and the first valve 16 and The opening of the fifth valve 20, if the temperature is within the room temperature setting interval, the sixth valve 21 and the fan 9 are maintained in the existing state; if the temperature is lower than the minimum value of the room temperature setting interval, the sixth valve 21 is opened, and the blower 9 is started. The blower 9 heats the air outside the greenhouse of the botanical garden through the second heat exchanger 4 and then heats the air inside the greenhouse of the botanical garden. The heating speed is adjusted by changing the opening of the fifth valve 20 and the sixth valve 21. The greater the deviation of the temperature inside the greenhouse of the botanical garden from the room temperature setting interval, the greater the opening of the fifth valve 20 and the sixth valve 21.

[0009] During use, the control system obtains the water temperature of the water in the insulated water tank 7 in real time through the first temperature sensor 14. If the water temperature is lower than the minimum setting temperature of the insulated water tank, the water pump 6 is started to circulate and heat the water in the insulated water tank 7 through the first heat exchanger 3. If the water temperature is greater than the maximum setting temperature of the insulated water tank, the water pump 6 is turned off and the second valve 17 is opened to add water to the insulated water tank 7. If the water temperature is at other temperatures, the opening of the first valve 16 and the fifth valve 20 is reduced.

[0010] A liquid level detection device connected to the control system is installed in the insulated water tank 7. When the water in the insulated water tank is in a set liquid level range, the capacity of the insulated water tank 7 can meet at least one irrigation requirement. When irrigation is needed, the control system opens the fourth valve 19 according to the irrigation settings to enable the irrigation sprinkler device 8 to perform irrigation spraying. After the irrigation is completed, the fourth valve 19 is closed, and the second valve 17 is opened to replenish the water in the insulated water tank 7 to the set liquid level range.

[0011] When the humidity sensor 15 detects that the humidity in the greenhouse of the botanical garden is lower than the minimum set humidity, the humidity regulating valve 11 is opened for humidification. When the humidity sensor 15 detects that the humidity in the greenhouse of the botanical garden is higher than the maximum set humidity, the humidity regulating valve 11 is closed, and the sixth valve 21 is opened to ventilate the air in the greenhouse of the botanical garden. When the humidity sensor 15 detects that the humidity in the greenhouse of the botanical garden is in the set humidity range, the humidity regulating valve 11 is closed.

[0012] The discharge port 12 is attached to the ground, and a fence is provided on the outside of the discharge port 12 , and the fence blocks external wind from blowing directly to the discharge port 12 .

[0013] The beneficial effects of the present invention are as follows: the present invention uses centralized heating to provide thermal energy to the greenhouse of the botanical garden, so that it can meet the environmental growth requirements of plants in the autumn, winter and spring in the north, and can adjust the humidity and temperature to meet the different growth environment requirements of plants in the greenhouse of the botanical garden. At the same time, the present invention has a high thermal utilization rate, and the overall automated control reduces labor requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention; 1. Inlet pipe of heating network, 2. Return pipe of heating network, 3. First heat exchanger, 4. Second heat exchanger, 5. External water supply, 6. Water pump, 7. Insulated water tank, 8. Irrigation sprinkler, 9. Air blower, 10. Bubble humidifier, 11. Humidity regulating valve, 12. Exhaust vent, 13. Second temperature sensor, 14. First temperature sensor, 15. Humidity sensor, 16. First valve, 17. Second valve, 18. Third valve, 19. Fourth valve, 20. Fifth valve, 21. Sixth valve. DETAILED DESCRIPTION

[0015] like Figure 1 As shown, a botanical garden greenhouse temperature and humidity control system based on urban centralized heating includes a botanical garden greenhouse, a heating network water inlet pipe 1 and a heating network return pipe 2 extending into the botanical garden greenhouse, a first heat exchanger 3, a second heat exchanger 4, an external water supply 5, a water pump 6, an insulation water tank 7, an irrigation sprinkler device 8, an air blower 9, a bubbling humidifier 10, a humidity sensor 15, a first temperature sensor 14, and a second temperature sensor 13 installed inside the botanical garden greenhouse, and a discharge port 12 is provided at the lower part of the botanical garden greenhouse.

[0016] The heating network water inlet pipe 1 is connected in series with the heat medium channel of the second heat exchanger 4 and the heat medium channel of the first heat exchanger 3 through the fifth valve 20 and then connected to the heating network water return pipe 2 through the first valve 16.

[0017] The air outside the greenhouse of the botanical garden passes through the air blower 9 and the sixth valve 21 and enters the cold medium channel of the second heat exchanger 4. The heated air coming out of the cold medium channel of the second heat exchanger 4 is divided into two branches, one branch directly enters the greenhouse of the botanical garden to heat the air in the greenhouse of the botanical garden, and the other branch enters the bubbling humidifier 10 after passing through the pipeline with the humidity regulating valve 11, and the water vapor and air coming out of the bubbling humidifier 10 directly enter the greenhouse of the botanical garden; the external water supply 5 is divided into two branches, one branch is connected to the bubbling humidifier 10 through the pipeline with the third valve 18 to provide water for the bubbling humidifier 10, and the other branch is connected to the cold medium inlet of the first temperature sensor 14 through the pipeline with the second valve 17, and the cold medium outlet of the first temperature sensor 14 is connected to the insulation water tank 7, and the insulation water tank 7 is connected to the cold medium inlet of the first temperature sensor 14 through the pipeline with the water pump 6, and the insulation water tank 7 is connected to the irrigation spray device 8 through the pipeline with the fourth valve 19.

[0018] The hot water provided by the water pipe 1 of the heating network is used to provide heat energy to the second heat exchanger 4 and the first heat exchanger 3 in turn. First, the air sent by the blower 9 is heated in the second heat exchanger 4 by using the direct water from the water pipe 1 of the heating network with a relatively high temperature (the water temperature of the water pipe 1 of the heating network is 70-90°C), and the heated air heats the air in the greenhouse of the botanical garden. The ambient temperature of the water supply for plants is the first priority and must be met, otherwise they cannot survive. Therefore, it is very necessary to first heat the air with the direct hot water at a relatively high temperature. Secondly, the thermal energy gradient is utilized, that is, the hot water cooled by the second heat exchanger 4 (the outlet temperature of the heat medium channel of the second temperature sensor 13 is 30-50°C) is used to heat the cold medium in the first heat exchanger 3 (the outlet temperature of the heat medium channel of the first heat exchanger 3 is 20-30°C). The cold medium in the first heat exchanger 3 is also water. The water pump 6 can realize the circulation heating of the water in the thermal insulation water tank 7, and then on the one hand, the first heat exchanger 3 is fully utilized to absorb the waste heat of the water from the heating pipe network after passing through the second heat exchanger 4, and on the other hand, the temperature of the irrigation water is guaranteed. At the same time, the thermal insulation water tank 7 can also provide temperature regulation for the greenhouse of the botanical garden, that is, when the ambient temperature is lower than the water temperature of the thermal insulation water tank 7, the thermal insulation water tank 7 releases heat, and when the ambient temperature is higher than the water temperature of the thermal insulation water tank 7, the thermal insulation water tank 7 absorbs heat. In other aspects, when the water in the thermal insulation water tank 7 is used for irrigation and spraying, the land in the greenhouse of the botanical garden can be heated to fully ensure the growth of plants. Of course, in reality, the land in the greenhouse of the botanical garden also absorbs environmental heat, such as heat in the air, and the blower 9 will hardly stop in the cold winter.

[0019] This embodiment also includes a control system. The present invention is an automated control system. The control system is an industrial control and display device or directly a computer. The water pump 6, the air blower 9, the humidity sensor 15, the first temperature sensor 14, the second temperature sensor 13, the humidity regulating valve 11, the first valve 16, the second valve 17, the third valve 18, the fourth valve 19, the fifth valve 20, and the sixth valve 21 are all connected to the control system by electrical signals. During use, the control system obtains the temperature in the greenhouse of the botanical garden in real time through the second temperature sensor 13. If the temperature is greater than the maximum value of the room temperature setting range, the sixth valve 21 is kept closed, the air blower 9 is not started, and the first valve 16 and the fifth valve are reduced. 20, if the temperature is within the room temperature setting interval, the sixth valve 21 and the fan 9 are kept in the existing state; if the temperature is lower than the minimum value of the room temperature setting interval, the sixth valve 21 is opened, and the fan 9 is started. The fan 9 heats the air outside the greenhouse of the botanical garden through the second heat exchanger 4 and then heats the air inside the greenhouse of the botanical garden. The heating speed is adjusted by changing the opening of the fifth valve 20 and the sixth valve 21. The greater the deviation of the temperature inside the greenhouse of the botanical garden from the room temperature setting interval, the greater the opening of the fifth valve 20 and the sixth valve 21.

[0020] In one embodiment, the second heat exchangers 4 are multiple in parallel, the number of the first heat exchangers 3 is the same as the number of the second heat exchangers 4, each second heat exchanger 4 is connected in series with a first heat exchanger 3, and each group of the second heat exchangers 4 and the first heat exchangers 3 after the series connection is connected in parallel to the water supply pipe 1 of the heating network and the return pipe 2 of the heating network. Each first heat exchanger 3 is a water-water heat exchanger, and each second heat exchanger 4 is a water-air heat exchanger. In the case of a large greenhouse in the botanical garden, each group of the second heat exchanger 4 and the first heat exchanger 3 are arranged at different positions in the greenhouse of the botanical garden. Each second heat exchanger 4 corresponds to a fifth valve 20, a sixth valve 21, and a fan 9. In severe cold weather, all the fifth valves 20 and the sixth valves 21 need to be opened to ensure the environmental temperature requirements of the plants. In high-temperature weather, some of the fifth valves 20 and the sixth valves 21 are closed to reduce the consumption of heat energy.

[0021] During use, the control system obtains the water temperature of the water in the insulated water tank 7 in real time through the first temperature sensor 14. If the water temperature is lower than the minimum setting temperature of the insulated water tank, the water pump 6 is started to circulate and heat the water in the insulated water tank 7 through the first heat exchanger 3. If the water temperature is greater than the maximum setting temperature of the insulated water tank, the water pump 6 is turned off and the second valve 17 is opened to add water to the insulated water tank 7. If the water temperature is at other temperatures, the opening of the first valve 16 and the fifth valve 20 is reduced. In one embodiment, the set temperature range in the insulated water tank 7 is 15-20°C. In actual use, due to the low temperature in winter, the water temperature in the insulated water tank 7 is generally not greater than the maximum setting temperature of the insulated water tank. In one embodiment, there is one insulated water tank 7, and all the first heat exchangers 3 exchange heat with the water in the insulated water tank 7 at the same time. In another embodiment, the number of the insulated water tanks 7 is less than or equal to the number of the first heat exchangers 3, some of the first heat exchangers 3 correspond to one insulated water tank 7 at the same time, and some of the first heat exchangers 3 correspond one-to-one to the insulated water tank 7. In one embodiment, there are two insulated water tanks 7 and three first heat exchangers 3, wherein one first heat exchanger 3 corresponds to one insulated water tank 7, and the other two first heat exchangers 3 correspond to another insulated water tank 7.

[0022] A liquid level detection device connected to the control system is installed in the insulated water tank 7 (if there are multiple insulated water tanks 7, each adopts the same setting). When the water in the insulated water tank is in the set liquid level range, the capacity of the insulated water tank 7 can meet the irrigation requirement for at least one time. When irrigation is needed, the control system opens the fourth valve 19 according to the irrigation setting to enable the irrigation sprinkler device 8 to perform irrigation spraying. After the irrigation is completed, the fourth valve 19 is closed, and the second valve 17 is opened to replenish the water in the insulated water tank 7 to the set liquid level range.

[0023] When the humidity sensor 15 detects that the humidity in the greenhouse of the botanical garden is lower than the minimum set humidity, the humidity regulating valve 11 is opened for humidification. When the humidity sensor 15 detects that the humidity in the greenhouse of the botanical garden is higher than the maximum set humidity, the humidity regulating valve 11 is closed, and the sixth valve 21 is opened to ventilate the air in the greenhouse of the botanical garden. When the humidity sensor 15 detects that the humidity in the greenhouse of the botanical garden is in the set humidity range, the humidity regulating valve 11 is closed.

[0024] The discharge port 12 is fitted on the ground, and there is a fence on the outside of the discharge port 12, and the fence blocks the outside wind from blowing directly to the discharge port 12. Fitting the discharge port on the ground can absorb the heat in the exhaust through the cold surface, retain the heat in the soil near the exhaust port, and avoid heat waste. Surrounding the discharge port 12 with a fence, on the one hand, the fence absorbs the heat in the exhaust and retains the heat in the fence and the soil of the fence, and on the other hand, it prevents strong winds from blowing in through the discharge port 12 when there is wind, and taking away the heat in the greenhouse of the botanical garden. Another way can also be used, the discharge port 12 is a U-shaped channel, one mouth of the U-shaped channel is in the greenhouse of the botanical garden, and the other mouth of the U-shaped channel is outside the greenhouse of the botanical garden, and there is a rain and snow protection fence outside the greenhouse of the botanical garden. The top of the U-shaped channel is downward and the mouth is upward.

[0025] Taking a botanical garden in a northern city in winter as an example, the water temperature of the external water supply 5 is 0~15°C, and the external water supply 5 flows into the circulation loop formed by the first heat exchanger 3 and the hot water tank 7, and the hot water tank 7 is connected to the irrigation sprinkler 8, and the other way flows into the bubbling humidifier 10; in one embodiment, the temperature of the fresh air outside the greenhouse of the botanical garden is -5~10°C, and it enters the second heat exchanger 4 through the air blower 9 and is heated to 15~30°C, and then the hot air enters the bubbling humidifier The humidifier 10 humidifies the air and then enters the greenhouse of the botanical garden. The other way directly enters the greenhouse of the botanical garden. The hot air circulates in the greenhouse of the botanical garden and is discharged through the vent 12. The temperature of the water inlet pipe 1 of the heating network is 70-90°C. After passing through the second heat exchanger 4 to release heat, the temperature is reduced to 30-50°C. The temperature of the inlet (heat medium) of the first heat exchanger 3 is 30-50°C. After passing through the first heat exchanger 3 to release heat, the temperature is reduced to 20-30°C, and then flows into the return water pipe 2 of the heating network.

[0026] In one embodiment, the second temperature sensor 13 is an air temperature sensor, which forms an interlock I with the fifth valve 20 and the sixth valve 21, and controls the opening of the two to ensure that the temperature in the greenhouse is within the range of 15-30°C; the first temperature sensor 14 is a hot water temperature sensor, which forms an interlock II with the first valve 16 and the second valve 17, and controls the opening of the two to ensure that the water temperature at the irrigation sprinkler device is within the range of 10-25°C; the humidity sensor 15 forms an interlock III with the third valve 18 and the fourth valve 19, and controls the opening of the two to ensure that the humidity in the greenhouse is within the range of 50-85%; the priority of the three interlocks is I>Ⅱ>Ⅲ.

[0027] The bubbling humidifier 10 is an auxiliary humidification method. When the plants do not need irrigation or spraying, the hot air is humidified by the bubbling humidifier 10 to ensure that the humidity in the greenhouse is within the range of 50% to 85%.

[0028] The vents 12 ensure that there is sufficient supply of fresh air and carbon dioxide inside the greenhouse, and promote the circulation of air inside the greenhouse.

[0029] The system can regulate the temperature and humidity in the greenhouse online in real time according to the needs of plant growth. It can significantly reduce the return water temperature of the heating network without the need for energy-consuming and rotating equipment such as heat pumps, and has high energy utilization efficiency and system reliability. It can meet the temperature requirements in the greenhouse without auxiliary heat sources and without the need for auxiliary heat sources with low exergy efficiency, in line with the principle of low energy quality and low use.

[0030] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. The various components of the present invention can be combined with each other under non-conflicting conditions, and any equivalent changes and modifications made by any technician in the field without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention.

Claims

1. A temperature and humidity control system for a botanical garden greenhouse based on urban centralized heating, characterized in that: The invention comprises a greenhouse of a botanical garden, a water supply pipe (1) and a return pipe (2) of a heating network extending into the greenhouse of the botanical garden, a first heat exchanger (3), a second heat exchanger (4), an external water supply (5), a water pump (6), a heat preservation water tank (7), an irrigation spray device (8), a blower (9), a bubbling humidifier (10), a humidity sensor (15), a first temperature sensor (14), and a second temperature sensor (13) installed inside the greenhouse of the botanical garden, and a discharge port (12) is provided at the bottom of the greenhouse of the botanical garden; the water supply pipe (1) of the heating network is connected in series with the heat medium channel of the second heat exchanger (4) and the heat medium channel of the first heat exchanger (3) through a fifth valve (20), and then connected to the return pipe (2) of the heating network through a first valve (16); air outside the greenhouse of the botanical garden enters the cold medium channel of the second heat exchanger (4) through the blower (9) and the sixth valve (21), and enters the cold medium channel of the second heat exchanger (4) from the second heat exchanger (4) The heated air coming out of the cold medium channel is divided into two branches, one branch directly enters the greenhouse of the botanical garden to heat the air in the greenhouse of the botanical garden, and the other branch enters the bubbling humidifier (10) after passing through a pipeline with a humidity regulating valve (11), and the water vapor and air coming out of the bubbling humidifier (10) directly enter the greenhouse of the botanical garden; the external water supply (5) is divided into two branches, one branch is connected to the bubbling humidifier (10) through a pipeline with a third valve (18) to provide water for the bubbling humidifier (10), and the other branch is connected to the cold medium inlet of the first temperature sensor (14) through a pipeline with a second valve (17), and the cold medium outlet of the first temperature sensor (14) is connected to the insulation water tank (7), and the insulation water tank (7) is connected to the cold medium inlet of the first temperature sensor (14) through a pipeline with a water pump (6), and the insulation water tank (7) is connected to the irrigation spray device (8) through a pipeline with a fourth valve (19).

2. The temperature and humidity control system for a botanical garden greenhouse based on urban centralized heating according to claim 1 is characterized in that: The water temperature of the water pipe (1) of the heating network is 70-90°C, the outlet temperature of the heat medium channel of the second temperature sensor (13) is 30-50°C, and the outlet temperature of the heat medium channel of the first heat exchanger (3) is 20-30°C.

3. The temperature and humidity control system for a botanical garden greenhouse based on urban centralized heating according to claim 1 is characterized in that: The invention also includes a control system, wherein the water pump (6), the air blower (9), the humidity sensor (15), the first temperature sensor (14), the second temperature sensor (13), the humidity regulating valve (11), the first valve (16), the second valve (17), the third valve (18), the fourth valve (19), the fifth valve (20), and the sixth valve (21) are all connected to the control system by electrical signals. During use, the control system obtains the temperature in the greenhouse of the botanical garden in real time through the second temperature sensor (13). If the temperature is greater than the maximum value of the room temperature setting range, the sixth valve (21) is kept closed, the air blower (9) is not started, and the humidity of the first valve is reduced. (16) and the opening of the fifth valve (20). If the temperature is within the room temperature setting interval, the sixth valve (21) and the fan (9) are kept in the existing state. If the temperature is lower than the minimum value of the room temperature setting interval, the sixth valve (21) is opened and the fan (9) is started. The fan (9) heats the air outside the greenhouse of the botanical garden through the second heat exchanger (4) and then heats the air inside the greenhouse of the botanical garden. The heating speed is adjusted by changing the opening of the fifth valve (20) and the sixth valve (21). The greater the deviation of the temperature inside the greenhouse of the botanical garden from the room temperature setting interval, the greater the opening of the fifth valve (20) and the sixth valve (21).

4. The temperature and humidity control system for a botanical garden greenhouse based on urban centralized heating according to claim 3 is characterized in that: During use, the control system obtains the water temperature of the water in the thermal insulation water tank (7) in real time through the first temperature sensor (14). If the water temperature is lower than the minimum setting temperature of the thermal insulation water tank, the water pump (6) is started to circulate and heat the water in the thermal insulation water tank (7) through the first heat exchanger (3). If the water temperature is higher than the maximum setting temperature of the thermal insulation water tank, the water pump (6) is turned off and the second valve (17) is opened to add water to the thermal insulation water tank (7). If the water temperature is at other temperatures, the openings of the first valve (16) and the fifth valve (20) are reduced.

5. The temperature and humidity control system for a botanical garden greenhouse based on urban centralized heating according to claim 4 is characterized in that: A liquid level detection device connected to a control system is installed in the insulated water tank (7). When the water in the insulated water tank is in a set liquid level range, the capacity of the insulated water tank (7) can meet the irrigation requirement for at least one time. When irrigation is required, the control system opens the fourth valve (19) according to the irrigation setting to enable the irrigation spray device 8 to perform irrigation spraying. After the irrigation is completed, the fourth valve (19) is closed and the second valve (17) is opened to replenish the water in the insulated water tank (7) to the set liquid level range.

6. The temperature and humidity control system for a botanical garden greenhouse based on urban centralized heating according to claim 5 is characterized in that: When the humidity sensor (15) detects that the humidity in the greenhouse of the botanical garden is lower than the minimum set humidity, the humidity regulating valve (11) is opened to humidify; when the humidity sensor (15) detects that the humidity in the greenhouse of the botanical garden is higher than the maximum set humidity, the humidity regulating valve (11) is closed, and the sixth valve (21) is opened to ventilate the air in the greenhouse of the botanical garden; when the humidity sensor (15) detects that the humidity in the greenhouse of the botanical garden is within the set humidity range, the humidity regulating valve (11) is closed.

7. The temperature and humidity control system for a botanical garden greenhouse based on urban centralized heating according to claim 1 is characterized in that: The discharge port (12) is attached to the ground, and a fence is provided on the outside of the discharge port (12), wherein the fence blocks external wind from directly blowing toward the discharge port (12).

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