Energy-saving constant temperature and humidity air conditioning system and control method thereof

Abstract

The present application relates to a kind of energy-saving constant temperature and humidity air conditioning system and its control method, belong to air conditioning technical field.The present application patent is changed by changing internal refrigeration system connecting pipe mode, and the single refrigeration system connecting pipe of original technology is changed into multiple refrigeration mode switchable mode, and the main function of system is divided into: heating mode condensing heat / electric heating, humidification mode, dehumidification mode fast dehumidification / high sensible heat mode, refrigeration mode primary refrigeration / secondary refrigeration, the switching between these functions, effectively utilize condensing heat recovery, reduce the power consumption of unit, overall improve the energy efficiency ratio of unit, simultaneously by the switching of two-stage evaporator, effectively dehumidification function selection can be realized Unit fast refrigeration dehumidification function, while effectively adjusting the superheat of unit, to improve the operating efficiency and stability of unit.

Description

Technical Field

[0001] This invention relates to an energy-saving constant temperature and humidity air conditioning system and its control method, belonging to the field of air conditioning technology. Background Technology

[0002] Currently, constant temperature and humidity air conditioning systems are used to establish a constant temperature and humidity environment within a set space, thereby ensuring a comfortable physical environment. With current technology, once this comfortable environment is established, maintaining it can achieve effective stability. However, the smoothness of the process from the start of temperature and humidity adjustment to the re-establishment of equilibrium determines the user experience and energy efficiency of the air conditioner.

[0003] Currently, the judgment of the above process is mostly based on adjusting the compressor, heater and humidifier of the air conditioning system to control the stability of the unit's temperature and humidity. Usually, this process requires a long adjustment time to reach the temperature and humidity settings required by the customer. The long adjustment time will lead to a certain amount of energy consumption of the unit. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an energy-saving constant temperature and humidity air conditioning system and its control method, which significantly improves overall performance compared to existing technologies. The specific technical solution is as follows: An energy-saving constant temperature and humidity air conditioning system includes an evaporator 1, an evaporator 2, a variable frequency compressor, a system main outlet pipe, a system main inlet pipe, and an external cold source. The inlet of the system main inlet pipe is connected to the outlet of the external cold source. The outlet of the system main inlet pipe is connected to the inlets of evaporator 1 and evaporator 2 via a T-junction. The outlets of evaporator 1 and evaporator 2 are connected to the inlet of the variable frequency compressor via a T-junction. The system main outlet pipe connects the outlet of the variable frequency compressor and the inlet of the external cold source. An electronic expansion valve 1 is provided between the inlet of the three-way valve 1 and the inlet of the evaporator 1, and a solenoid valve 5 is provided between the evaporator 1 and the three-way valve 6; an electronic expansion valve 2 and a solenoid valve 1 are provided between the three-way valve 1 and the inlet of the evaporator 2, the three-way valve 1 is connected to the inlet of the solenoid valve 1, the outlet of the solenoid valve 1 is connected to the inlet of the electronic expansion valve 2, and the outlet of the electronic expansion valve 2 is connected to the inlet of the evaporator 2.

[0005] Furthermore, the evaporator is equipped with a fan, the fan inlet is equipped with a humidification component, and the fan outlet is equipped with an electric heating component.

[0006] Furthermore, the first evaporator is located on the outermost side of the return air side, the second evaporator is located on the inner surface of the first evaporator, and the heat exchange area of ​​the second evaporator is smaller than that of the first evaporator.

[0007] Furthermore, it also includes solenoid valve three and solenoid valve four. The outlet of evaporator one is connected to the inlet of solenoid valve four through three-way five. The outlet of solenoid valve four is connected to the inlet of solenoid valve three. The outlet of solenoid valve three is connected to the inlet of evaporator two through three-way four. The outlet of evaporator two is connected to the inlet of evaporator one through three-way six.

[0008] Furthermore, it also includes a second solenoid valve, the inlet of which is connected to the outlet of the first solenoid valve via a three-way valve, and the outlet of the second solenoid valve is connected to the inlet of the third solenoid valve via a three-way valve.

[0009] A control method for an energy-saving constant temperature and humidity air conditioning system includes a controller. The controller includes a temperature sensor and a humidity sensor. The controller is connected to the air conditioning system's electric heating component, humidification component, fan, variable frequency compressor, electronic expansion valve one, electronic expansion valve two, solenoid valve one, solenoid valve two, solenoid valve three, solenoid valve four, and solenoid valve five. The control method includes the following steps: 1. The air conditioning system is started up; Second, the controller detects the real-time temperature and humidity in the air and selects the corresponding control mode by comparing them with the set values ​​of temperature and humidity.

[0010] Furthermore, the temperature setting is 23℃±0.5℃, and the humidity setting is 50%±1.5%. These temperature and humidity settings can be adjusted according to seasonal or environmental changes. For example, the temperature setting is 23℃±0.5℃, and the relative humidity setting is 50%±1.5%. Therefore, high temperature and high humidity means the real-time temperature is greater than temperature + control accuracy, and the real-time humidity is greater than humidity + control accuracy; high temperature and low humidity means the real-time temperature is greater than temperature + control accuracy, and the humidity is less than or equal to humidity - control accuracy; low temperature and high humidity means the detected temperature is less than or equal to temperature - control accuracy, and the humidity is greater than humidity + control accuracy; low temperature and low humidity means the detected temperature is less than or equal to temperature - control accuracy, and the humidity is less than or equal to humidity - control accuracy.

[0011] Furthermore, the control modes include heating mode, humidification mode, dehumidification mode, and cooling mode. The heating modes include a condensing heating mode and an electric heating mode. The condensing heating mode involves closing solenoid valve four and electronic expansion valve two, and opening solenoid valves one, two, three, and five. A portion of the external cold source flows sequentially through the system's main inlet pipe into solenoid valves one, two, three, and evaporator two, while another portion flows sequentially through the system's main inlet pipe into electronic expansion valve one, evaporator one, and solenoid valve five. The two portions merge and flow into the inverter compressor and out through the system's main outlet pipe. This mode improves unit energy efficiency by introducing an external condensing heat source to replace electric heating.

[0012] The dehumidification modes include a rapid dehumidification mode and a high sensible heat mode. The rapid dehumidification mode involves closing solenoid valves two, three, four, and five, and electronic expansion valve one, while opening solenoid valve one. The external cold source flows sequentially through the system's main inlet pipe into solenoid valve one, electronic expansion valve two, evaporator two, and the inverter compressor, and finally flows out through the system's main outlet pipe. This mode reduces the heat exchanger area by switching the system connection, thereby enabling rapid and effective dehumidification and improving unit efficiency.

[0013] The high sensible heat mode involves closing solenoid valves two, three, and four, and opening solenoid valves one and five. A portion of the external cold source flows sequentially through the system's main inlet pipe into solenoid valve one, electronic expansion valve two, and evaporator two; another portion flows sequentially through the system's main inlet pipe into electronic expansion valve one, evaporator one, and solenoid valve five. The two portions merge and flow into the inverter compressor, exiting through the system's main outlet pipe. This mode increases the evaporation area and sensible heat ratio by having two evaporators operate in parallel, reducing unnecessary humidification and improving unit energy efficiency.

[0014] The cooling modes include a primary cooling mode and a secondary cooling mode. The primary cooling mode involves closing solenoid valves one and four, and opening solenoid valve five. The external cold source flows sequentially through the system's main inlet pipe into electronic expansion valve one, evaporator one, solenoid valve five, and the inverter compressor, and finally flows out through the system's main outlet pipe. This is the primary cooling mode, and the cooling and dehumidification capacities can be adjusted by regulating the inverter compressor and the fan.

[0015] The two-stage refrigeration mode involves closing solenoid valves one, two, and five, and opening solenoid valves three and four. The external cold source flows sequentially through the system's main inlet pipe into electronic expansion valve one, evaporator one, solenoid valve four, solenoid valve three, evaporator two, and the inverter compressor, and finally flows out through the system's main outlet pipe. This mode can effectively increase the heat exchanger area to improve unit performance when the cooling capacity demand is high.

[0016] Furthermore, if the detected real-time temperature and real-time humidity are both greater than the set values, the A control method is run. The A control method includes the following steps: A1: rapid dehumidification mode; A2: secondary cooling mode; A3: primary cooling mode; and finally, the temperature and humidity are adjusted to the set values ​​through humidification mode or heating mode.

[0017] If the detected real-time temperature is greater than the set value and the real-time humidity is less than the set value, the B control method is run. The B control method includes the following steps: B1: secondary cooling mode; B2: humidification mode; B3: primary cooling mode; and finally, the temperature and humidity are adjusted to the set values ​​through the humidification mode or heating mode.

[0018] If the detected real-time temperature is lower than the set value and the real-time humidity is higher than the set value, the C control method is run; the C control method includes the following steps: C1: rapid dehumidification mode; C2: heating mode; C3: first-level cooling mode; finally, the temperature and humidity are adjusted to the set values ​​through the humidification mode or heating mode.

[0019] If the detected real-time temperature and real-time humidity are both lower than the set values, the D control method is run; the D control method includes the following steps: D1: heating mode; D2: humidification mode; D3: first-level cooling mode; finally, the temperature and humidity are adjusted to the set values ​​through the humidification mode or heating mode.

[0020] Furthermore, the heating mode is preferably a condensation heating mode.

[0021] The beneficial effects of this invention are: Compared with existing technologies, this invention patent changes the internal refrigeration system connection pipe method, replacing the original single refrigeration system connection pipe with a multi-mode switchable method. The main functions of the system are: heating mode (condensing heat / electric heating), humidification mode, dehumidification mode (rapid dehumidification / high sensible heat mode), and cooling mode (first-stage cooling / second-stage cooling). The switching between these functions effectively utilizes condensation heat recovery, reduces unit power consumption, and improves the overall unit energy efficiency ratio. At the same time, through the switching and adjustment of the two-stage evaporator, the dehumidification function can be effectively selected, enabling the unit to achieve rapid cooling and dehumidification. It can also effectively regulate the unit's superheat, thereby improving the unit's operating efficiency and stability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the control structure of the present invention; Figure 3 This is a schematic diagram of the control method of the present invention; In the diagram: 1-Evaporator 1, 2-Evaporator 2, 3-Electric heating component, 4-Humidification component, 5-Fan, 6-Variable frequency compressor, 7-Electronic expansion valve 1, 8-Electronic expansion valve 2, 9-Solenoid valve 1, 10-Solenoid valve 2, 11-Solenoid valve 3, 12-Solenoid valve 4, 13-Solenoid valve 5, 14-T-1, 15-T-2, 16-T-3, 17-T-4, 18-T-5, 19-T-6, 20-System main outlet pipe, 21-System main inlet pipe. Implementation

[0023] The invention will now be described in further detail with reference to the accompanying drawings.

[0024] like Figure 1As shown, this embodiment includes an evaporator 1, a variable frequency compressor 6, an electronic expansion valve 7, a solenoid valve 13, a system main outlet pipe 20, and a system main inlet pipe 21. A fan 5 is provided on the top of the evaporator 1. A humidification component 4 is provided at the air inlet of the fan 5, and an electric heating component 3 is provided at the air outlet of the fan 5.

[0025] The inlet of the system main inlet pipe 21 is connected to an external cold source. The outlet of the system main inlet pipe 21 is connected to the inlet of electronic expansion valve 7. The outlet of electronic expansion valve 7 is connected to the inlet of evaporator 1. The outlet of evaporator 1 is connected to the inlet of solenoid valve 13. The outlet of solenoid valve 13 is connected to the inlet of inverter compressor 6. The outlet of inverter compressor 6 is connected to the inlet of system main outlet pipe 20. The outlet of system main outlet pipe 20 is connected to the external cold source. The external cold source flows sequentially through system main inlet pipe 21 into electronic expansion valve 7, evaporator 1, solenoid valve 13, and inverter compressor 6, and finally flows out through system main outlet pipe 20. This is a single-stage cooling mode, and the cooling capacity and dehumidification capacity can be adjusted by regulating inverter compressor 6 and fan 5.

[0026] This embodiment also includes an evaporator 2, a solenoid valve 3 11, and a solenoid valve 4 12. The evaporator 1 is located on the outermost side of the return air side, and the evaporator 2 is located on the inner surface of the evaporator 1. The heat exchange area of ​​the evaporator 2 is smaller than that of the evaporator 1.

[0027] The outlet of evaporator 1 is connected to the inlet of solenoid valve 4 12 via three-way valve 5 18. The outlet of solenoid valve 4 12 is connected to the inlet of solenoid valve 3 11. The outlet of solenoid valve 3 11 is connected to the inlet of evaporator 2. The outlet of evaporator 2 2 is connected to the inlet of evaporator 1 via three-way valve 6 19. For example... Figure 3 As shown, the external cold source flows sequentially through the system's main inlet pipe 21 into the electronic expansion valve 7, evaporator 1, solenoid valve 4 12, solenoid valve 3 11, evaporator 2, and variable frequency compressor 6, and finally flows out through the system's main outlet pipe 20. This is a two-stage refrigeration mode, which can effectively increase the heat exchanger area to improve unit performance when the cooling capacity demand is high.

[0028] This embodiment also includes an electronic expansion valve 28 and a solenoid valve 9. The outlet of the system main inlet pipe 21 is connected to the inlet of solenoid valve 9 via a tee-14. The outlet of solenoid valve 9 is connected to the inlet of electronic expansion valve 28. The outlet of electronic expansion valve 28 is connected to the inlet of evaporator 22 via a tee-417. External cold source flows sequentially into solenoid valve 9, electronic expansion valve 28, evaporator 22, and inverter compressor 6 through the system main inlet pipe 21, and finally flows out through the system main outlet pipe 20. This is a rapid dehumidification mode. By switching the system connection, the heat exchanger area is reduced, thereby enabling rapid and effective dehumidification and improving unit efficiency.

[0029] Part of the external cold source flows sequentially through the system's main inlet pipe 21 into solenoid valve 9, electronic expansion valve 8, and evaporator 2; the other part flows sequentially through the system's main inlet pipe 21 into electronic expansion valve 7, evaporator 1, and solenoid valve 13. The two parts converge and flow into the inverter compressor 6, exiting through the system's main outlet pipe 20. This is a high sensible heat mode, which increases the evaporation area and sensible heat ratio by having two evaporators operate in parallel, reducing unnecessary humidification and improving unit energy efficiency.

[0030] This embodiment also includes solenoid valve 2 10. The inlet of solenoid valve 2 10 is connected to the outlet of solenoid valve 1 9 via tee 2 15, and the outlet of solenoid valve 2 10 is connected to the inlet of solenoid valve 3 11 via tee 3 16. Part of the external cold source flows sequentially into solenoid valve 1 9, solenoid valve 2 10, solenoid valve 3 11, and evaporator 2 2 through the system main inlet pipe 21, while another part flows sequentially into electronic expansion valve 1 7, evaporator 1 1, and solenoid valve 5 13 through the system main inlet pipe 21. The two parts merge and flow into the variable frequency compressor 6 and out through the system main outlet pipe 20. This mode is a condensing heat mode, which improves the unit's energy efficiency by introducing an external condensing heat source to replace electric heating capacity.

[0031] This embodiment also includes a controller, which includes a temperature sensor and a humidity sensor, such as... Figure 2 As shown, the controller is connected to the air conditioning system's electric heating component 3, humidification component 4, fan 5, variable frequency compressor 6, electronic expansion valve 1 7, electronic expansion valve 2 8, solenoid valve 1 9, solenoid valve 2 10, solenoid valve 3 11, solenoid valve 4 12 and solenoid valve 5 13.

[0032] like Figure 3 As shown, the control method includes the following steps: 1. Start the air conditioning system; 2. The controller detects the real-time temperature and humidity in the air and selects the corresponding control mode by comparing them with the set temperature and humidity values: The temperature setting is 23℃±0.5℃, and the humidity setting is 50%±1.5%.

[0033] The control modes include heating mode, humidification mode, dehumidification mode and cooling mode. The heating mode includes condensing heat mode and electric heating mode. The dehumidification mode includes rapid dehumidification mode and high sensible heat mode. The cooling mode includes primary cooling mode and secondary cooling mode.

[0034] If the detected real-time temperature and real-time humidity are both greater than the set values, the A control method will be run. The A control method includes the following steps: A1: rapid dehumidification mode; A2: secondary cooling mode; A3: primary cooling mode.

[0035] If the detected real-time temperature is greater than the set value and the real-time humidity is less than the set value, the B control method is activated. The B control method includes the following steps: B1: secondary cooling mode; B2: humidification mode; B3: primary cooling mode.

[0036] If the detected real-time temperature is lower than the set value and the real-time humidity is higher than the set value, the C control method is activated. The C control method includes the following steps: C1: rapid dehumidification mode; C2: condensing heating mode; C3: first-level cooling mode.

[0037] If the detected real-time temperature and real-time humidity are both lower than the set values, the D control method is activated. The D control method includes the following steps: D1: Condensing heating mode; D2: Humidification mode; D3: Level 1 cooling mode.

[0038] 3. Adjust the temperature and humidity settings using the humidification mode or condensation heating mode to obtain stable and suitable temperature and humidity.

[0039] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification.

Claims

1. An energy-saving constant temperature and humidity air conditioning system, characterized in that: The system includes evaporator 1 (1), evaporator 2 (2), variable frequency compressor (6), system main outlet pipe (20), system main inlet pipe (21), and an external cold source. The inlet of the system main inlet pipe (21) is connected to the outlet of the external cold source. The outlet of the system main inlet pipe (21) is connected to the inlets of evaporator 1 (11) and evaporator 2 (2) through a three-way connector 1 (14). The outlets of evaporator 1 (1) and evaporator 2 (2) are connected to the inlet of the variable frequency compressor (6) through a three-way connector 6 (19). The system main outlet pipe (20) is connected to the outlet of the variable frequency compressor (6) and the inlet of the external cold source. An electronic expansion valve 1 (7) is provided between the inlet of the three-way valve 1 (14) and the inlet of the evaporator 1 (1), and a solenoid valve 5 (13) is provided between the evaporator 1 (1) and the three-way valve 6 (19); an electronic expansion valve 2 (8) and a solenoid valve 1 (9) are provided between the three-way valve 1 (14) and the inlet of the evaporator 2 (2), the three-way valve 1 (14) is connected to the inlet of the solenoid valve 1 (9), the outlet of the solenoid valve 1 (9) is connected to the inlet of the electronic expansion valve 2 (8), and the outlet of the electronic expansion valve 2 (8) is connected to the inlet of the evaporator 2 (2); It also includes solenoid valve three (11) and solenoid valve four (12). The outlet of evaporator one (1) is connected to the inlet of solenoid valve four (12) through three-way five (18). The outlet of solenoid valve four (12) is connected to the inlet of solenoid valve three (11). The outlet of solenoid valve three (11) is connected to the inlet of evaporator two (2) through three-way four (17). The outlet of evaporator two (2) is connected to the inlet of evaporator one (1) through three-way six (19). It also includes solenoid valve two (10), the inlet of which is connected to the outlet of solenoid valve one (9) through three-way two (15), and the outlet of solenoid valve two (10) is connected to the inlet of solenoid valve three (11) through three-way three (16).

2. The energy-saving constant temperature and humidity air conditioning system according to claim 1, characterized in that: The evaporator (1) is equipped with a fan (5), the air inlet of the fan (5) is equipped with a humidification component (4), and the air outlet of the fan (5) is equipped with an electric heating component (3).

3. The energy-saving constant temperature and humidity air conditioning system according to claim 1, characterized in that: Evaporator 1 (1) is located on the outermost side of the return air side, and evaporator 2 (2) is located on the inner surface of evaporator 1 (1), and the heat exchange area of ​​evaporator 2 (2) is smaller than that of evaporator 1 (1).

4. The control method for the energy-saving constant temperature and humidity air conditioning system according to any one of claims 1-3, characterized in that: The controller includes a temperature sensor and a humidity sensor. The controller is connected to the electric heating component (3), humidification component (4), fan (5), variable frequency compressor (6), electronic expansion valve one (7), electronic expansion valve two (8), solenoid valve one (9), solenoid valve two (10), solenoid valve three (11), solenoid valve four (12) and solenoid valve five (13) of the air conditioning system. The control method includes the following steps:

1. The air conditioning system is started up; Second, the controller detects the real-time temperature and humidity in the air and selects the corresponding control mode by comparing them with the set values ​​of temperature and humidity.

5. The control method for the energy-saving constant temperature and humidity air conditioning system according to claim 4, characterized in that: The temperature is set to 23℃±0.5℃, and the humidity is set to 50%±1.5%.

6. The control method for the energy-saving constant temperature and humidity air conditioning system according to claim 4, characterized in that: The control modes include heating mode, humidification mode, dehumidification mode, and cooling mode. The heating modes include a condensing heating mode and an electric heating mode: the condensing heating mode includes closing solenoid valve four (12) and electronic expansion valve two (8), and opening solenoid valve one (9), solenoid valve two (10), solenoid valve three (11) and solenoid valve five (13). The dehumidification modes include a rapid dehumidification mode and a high sensible heat mode: the rapid dehumidification mode includes closing solenoid valve two (10), solenoid valve three (11), solenoid valve four (12), solenoid valve five (13) and electronic expansion valve one (7), and opening solenoid valve one (9). The high sensible heat mode includes closing solenoid valve 2 (10), solenoid valve 3 (11) and solenoid valve 4 (12), and opening solenoid valve 1 (9) and solenoid valve 5 (13). The cooling modes include a first-level cooling mode and a second-level cooling mode: the first-level cooling mode includes closing solenoid valve one (9) and solenoid valve four (12) and opening solenoid valve five (13); the second-level cooling mode includes closing solenoid valve one (9), solenoid valve two (10) and solenoid valve five (13) and opening solenoid valve three (11) and solenoid valve four (12).

7. The control method for the energy-saving constant temperature and humidity air conditioning system according to claim 4, characterized in that: If both the detected real-time temperature and real-time humidity are greater than the set values, control method A is executed. Includes the following steps: A1: Rapid dehumidification mode; A2: Two-stage cooling mode; A3: First-level cooling mode; finally, adjust the temperature and humidity to the set values ​​through humidification or heating mode; If the detected real-time temperature is greater than the set value and the real-time humidity is less than the set value, then control method B is executed. Includes the following steps: B1: Second-stage cooling mode; B2: Humidification mode; B3: Level 1 cooling mode; Finally, adjust the temperature and humidity settings using either the humidification or heating mode. If the detected real-time temperature is lower than the set value and the real-time humidity is higher than the set value, the C control method is executed; the C control method includes the following steps: C1: rapid dehumidification mode; C2: heating mode; C3: first-level cooling mode; finally, the temperature and humidity are adjusted to the set values ​​through the humidification mode or heating mode; If the detected real-time temperature and real-time humidity are both lower than the set values, the D control method is run; the D control method includes the following steps: D1: heating mode; D2: humidification mode; D3: first-level cooling mode; finally, the temperature and humidity are adjusted to the set values ​​through the humidification mode or heating mode.

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