A control method for a heat pump driven composite dehumidification system

Abstract

The present invention discloses a control method for a heat pump-driven composite dehumidification system, wherein the dehumidification mode is switched during operation, wherein the dehumidification mode includes a single-rotor dehumidification mode, a single heat pump dehumidification mode, and a composite dehumidification mode; the method comprises the following steps: A. System standby: when the relative humidity of the environment is less than 50%, the system is in a standby state; B. Release standby: when the relative humidity of the environment is ≥50%, the system releases the standby state and selects an operation mode according to the ambient temperature: when the ambient temperature is less than 14°C, the single-rotor dehumidification mode is operated; when the ambient temperature is 14°C≤ambient temperature<26°C, the single heat pump dehumidification mode is operated; when the ambient temperature is ≥26°C, the composite dehumidification mode is operated; C. Ambient humidity judgment: after a set time Δt 1 Then judge the relative humidity of the environment again. If the relative humidity of the environment is ≥50%, the system will keep running; if the relative humidity of the environment is <50%, all running components will be turned off and the system will return to the standby state until Δt 1 The next judgment after that.

Description

Technical Field

[0001] The invention relates to a dehumidification system, and in particular to a control method for a composite dehumidification system driven by a heat pump. Background Art

[0002] Water vapor in the air affects people's comfort and industrial production processes, and can cause corrosion to some building structures and equipment. Therefore, dehumidification technology is indispensable to various industries. In the fields of medical treatment, precision instruments, etc., humidity control must be more stringent, which belongs to the field of deep dehumidification technology. In the existing technology, conventional dehumidification systems often use a single dehumidification method and cannot meet the requirements of deep dehumidification.

[0003] Although there are composite dehumidification systems based on transcritical carbon dioxide heat pump regeneration that can meet more stringent humidity requirements, this composite dehumidification system does not show energy-saving advantages under all working conditions. When the ambient temperature is too low (such as less than 14°C), the evaporator working condition is too bad for the carbon dioxide heat pump, and the heat pump dehumidification efficiency is poor. When the ambient temperature is too low, the heat pump is also at risk of frost. The system has higher energy efficiency with a single rotary dehumidification system. When the ambient temperature is too high (such as greater than 26°C), the air humidity is too high, and single rotary dehumidification or single heat pump dehumidification is difficult to meet the deeper dehumidification requirements. A composite dehumidification mode is required to meet the requirements. When the ambient temperature is between 14°C and 26°C, the heat pump is used for higher dehumidification efficiency and can meet the dehumidification requirements. If the rotary dehumidification system is turned on, the overall energy efficiency of the system will be reduced due to the presence of electric heating, resulting in unnecessary waste. At this time, the system has higher energy efficiency with a single heat pump dehumidification system.

[0004] In summary, there is an urgent need for a control method that can enable the composite dehumidification system to adjust the operation mode of the system under different working conditions to avoid wasting electricity and service life due to always being in the composite dehumidification mode. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a control method for a heat pump-driven composite dehumidification system which is convenient to use, has a high dehumidification effect, and can adaptively switch and reduce system energy consumption.

[0006] In order to solve the above technical problems, the control method of the heat pump driven composite dehumidification system of the present invention comprises a Roots blower, an expansion valve, a rotor, a heater and a compressor. By dynamically monitoring the ambient temperature and humidity, the system adaptively switches the dehumidification mode during operation. The dehumidification mode comprises a single rotor dehumidification mode, a single heat pump dehumidification mode and a composite dehumidification mode. The control method comprises the following steps: A. System standby: When the relative humidity is less than 50%, the system is in standby mode; B. Release standby: When the relative humidity of the environment is ≥50%, the system will release the standby state, start the Roots blower, and select the operation mode according to the ambient temperature: when the ambient temperature is <14℃, the single rotor dehumidification mode will be operated; when the ambient temperature is 14℃≤ambient temperature<26℃, the single heat pump dehumidification mode will be operated; when the ambient temperature is ≥26℃, the compound dehumidification mode will be operated; C. Ambient humidity judgment: After the set time Δt1, the ambient relative humidity is judged again. If the ambient relative humidity is ≥50%, the system will remain in operation; if the ambient relative humidity is <50%, all operating components will be shut down and the system will return to standby mode until the next judgment after Δt1.

[0007] Specifically, when the ambient temperature is less than 14°C, the compressor is not started, only the rotor and the heater are started, the ambient temperature and humidity are read by the temperature and humidity sensor, the rotor gear and the heater power are set according to the corresponding preset values, and it is judged whether the ambient temperature is ≥14°C every set time Δt. If so, the rotor and the heater are turned off and the compressor is started. It is judged whether the ambient temperature satisfies 14°C≤ambient temperature<26°C every set time Δt. If so, it is switched to the single heat pump dehumidification mode; it is judged whether the ambient temperature is ≥26°C every set time Δt. If so, it is switched to the compound dehumidification mode.

[0008] Specifically, when the ambient temperature is 14°C ≤ ambient temperature < 26°C, the compressor and the expansion valve are started for heat pump dehumidification; the ambient temperature and humidity are read by the temperature and humidity sensor, and the compressor speed and the expansion valve opening are adjusted according to the preset values; whether the ambient temperature is ≥ 26°C is judged at set time intervals Δt, and if so, the compound dehumidification mode is switched; whether the ambient temperature is < 14°C is judged at set time intervals Δt, and if so, the compressor is turned off and the single-wheel dehumidification mode is switched.

[0009] Specifically, when the ambient temperature is ≥26°C, the composite dehumidification mode starts the compressor, the rotor and the heater at the same time to realize the joint dehumidification of the heat pump and the rotor, reads the ambient temperature and humidity through the temperature and humidity sensor, sets the compressor speed, the expansion valve opening, the rotor gear and the heater power according to the corresponding preset values, and detects whether the ambient temperature is <14°C at set time intervals Δt. If so, shut down the compressor and switch to the single rotor dehumidification mode; detects whether the ambient temperature satisfies 14°C≤ambient temperature<26°C at set time intervals Δt2. If so, switch to the single heat pump dehumidification mode.

[0010] The number of the Roots blowers is two.

[0011] Advantages of the present invention: (1) Regardless of whether the ambient temperature is below 14°C, between 14°C and 26°C, or above 26°C, the system can select the optimal dehumidification mode through multiple dynamic judgments, thereby achieving good adaptation to complex climatic conditions. By adaptively switching between single-rotor dehumidification mode, single heat pump dehumidification mode and compound dehumidification mode, the system can dynamically adjust the operating mode according to the real-time changes in ambient temperature and humidity, effectively improving the dehumidification efficiency of the system and meeting the needs under different working conditions.

[0012] (2) The system enters standby mode when the ambient humidity is lower than 50%. At the same time, through precise mode switching and power adjustment, unnecessary energy consumption is avoided. In particular, the energy consumption is low in single-wheel mode, which reflects the characteristics of energy saving and environmental protection.

[0013] (3) The system adopts a fully automated operation mode, monitors environmental data in real time through temperature and humidity sensors, and dynamically adjusts operating parameters based on preset values. It does not require human intervention, making it more convenient for users to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a flow chart of the control method of the heat pump driven composite dehumidification system of the present invention; Figure 2 It is a monthly dehumidification power consumption diagram of the heat pump driven composite dehumidification system control method of the present invention; Figure 3 The annual dehumidification power consumption diagram of the heat pump driven composite dehumidification system control method of the present invention; Figure 4 This is a hardware structure diagram of the heat pump driven composite dehumidification system control method of the present invention. DETAILED DESCRIPTION

[0015] The control method of the heat pump driven composite dehumidification system of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Example

[0016] like Figure 4As shown, the heat pump driven composite dehumidification system includes the following components: compressor 1, condenser 2, liquid reservoir 3, expansion valve 4, evaporator 5, temperature and humidity sensor 6, control module 7, heater 8, Roots blower I 9, Roots blower II 10, dehumidification rotor 11, rotor regeneration zone 12, and rotor treatment zone 13; the compressor 1, condenser 2, liquid reservoir 3, expansion valve, and evaporator 5 are connected through copper pipes to form a heat pump system, and carbon dioxide flows in the pipes as a refrigerant; the wind paths of the condenser 2, heater 8, rotor regeneration zone 12, and Roots blower I are connected in series, and the regenerated wind taken from the environment passes through the condenser 2, heater 8, rotor regeneration zone 12, and Roots blower I in sequence and is then discharged into the environment; the evaporator 5, the rotor treatment zone 13, and the wind paths of Roots blower II are connected in series, and the treated air taken from the environment passes through the evaporator 5, the wheel processing area 13, and the Roots blower II in sequence and is then transported to the place of use; the temperature and humidity sensor 6 is removed into the inlet air duct of the evaporator 5 to measure the temperature and humidity of the treated air inlet, that is, the ambient temperature and humidity; the compressor 1, the expansion valve, the temperature and humidity sensor 6, the Roots blower I, the Roots blower II, the heater 8, and the dehumidification wheel are connected to the control module 7 through the circuit, and the control module 7 can not only control the start and stop of the compressor 1, the expansion valve, the Roots blower I, the Roots blower II, the heater 8, and the dehumidification wheel, but also control their operating parameters, and the control module 7 can also read the readings of the temperature and humidity sensor 6 in real time.

[0017] like Figure 1 As shown, the control method of the heat pump driven composite dehumidification system dynamically monitors the ambient temperature and humidity, and the system adaptively switches the dehumidification mode during operation. The dehumidification modes include single rotor dehumidification mode, single heat pump dehumidification mode, and composite dehumidification mode. Specifically, the following steps are included: In step 210, the system is in standby mode; In step 220, in response to the relative humidity of the environment being ≥50%, the system exits the standby state; In step 230, two Roots blowers are started (230); Every time a set time Δt1 passes, step 220 is performed to re-judge the ambient humidity. If the ambient relative humidity is greater than or equal to 50%, no additional operation is performed on the system. If the ambient relative humidity is less than 50%, all operating components are shut down and the system enters the standby state again until it is judged again after Δt1.

[0018] Specifically, after the system is released from the standby state and the two Roots blowers are started, step 240 is performed to determine whether the ambient temperature is ≥ 14° C.: If the judgment is no, the system enters the single-rotor dehumidification mode and only turns on the rotor module; If the judgment is yes, the compressor 1 is started.

[0019] Specifically, the single-rotor dehumidification mode process is as follows: In step 240, after determining that the ambient temperature is ≥ 14°C, if the compressor 1 is not started, proceed to step 251 to start the rotor and the heater 8, then use the temperature and humidity sensor 6 to read the ambient temperature and humidity, proceed to step 252, set the rotor gear and the heater 8 power according to the corresponding preset values, and then proceed to step 253 every set time Δt to determine that the ambient temperature is ≥ 14°C: If the answer is no, the process returns to step 252; if the answer is yes, the process proceeds to step 254, turns off the rotor and heater 8, proceeds to step 260, starts compressor 1, and does not proceed to step 253.

[0020] Specifically, after starting the compressor 1 in step 260, step 270 is performed to determine whether the ambient temperature is ≥ 26°C. When the ambient temperature is greater than or equal to 26°C, the system enters the compound dehumidification mode; when the ambient temperature is less than 26°C, the system enters the single heat pump dehumidification mode.

[0021] Specifically, the following control flow of the composite dehumidification mode is as follows: after performing step 270 to determine that the ambient temperature is ≥ 26°C, when the compressor 1 is started, performing step 291 to start the rotor and the heater 8, performing step 292 to read the ambient temperature and humidity, and setting the compressor 1 speed, the expansion valve opening, the rotor gear, and the heater 8 power according to the corresponding preset values, and then performing step 293 every time after the set time Δt, to determine that the ambient temperature is < 26°C: If the judgment is no, return to step 292; If the answer is yes, the process proceeds to step 294 to turn off the rotor and the heater 8, and the system switches to the single heat pump dehumidification mode, and step 293 is no longer performed.

[0022] Specifically, the single heat pump dehumidification mode control process is: perform step 270 to determine whether the ambient temperature is ≥ 26°C. If the determination is no, perform step 281 to read the ambient temperature and humidity, and set the compressor 1 speed and the expansion valve opening according to the corresponding preset values. After that, perform step 282 once every set time Δt to determine whether the ambient temperature is < 26°C: If the judgment is no, the mode is switched to the compound dehumidification mode, and step 282 is not performed any more; If the judgment is yes, then further proceed to step 283: If the judgment is no, return to step 281; If the answer is yes, proceed to step 284, turn off compressor 1, switch the system to single-wheel dehumidification mode, and no longer proceed to step 282.

[0023] like Figure 2 , Figure 3As shown in the figure, the monthly and annual dehumidification power consumption of the heat pump-driven composite dehumidification system control method of the present invention is shown. It can be seen from the data that by adaptively switching the dehumidification mode and combining the joint operation mechanism of the rotor and the heat pump, the system can significantly reduce energy consumption while meeting the dehumidification needs. Especially when the ambient humidity is low or the temperature is high, the composite dehumidification mode can give full play to the synergy of the heat pump and the rotor to further optimize the energy utilization efficiency. At the same time, because the system has dynamic adjustment capabilities, it can intelligently adapt to the optimal mode under different climatic conditions, making the overall operation more energy-saving and environmentally friendly, showing great economic and practical advantages.

Claims

1. A control method for a heat pump driven composite dehumidification system, characterized in that: The system hardware includes a Roots blower, an expansion valve, a rotor, a heater and a compressor. By dynamically monitoring the ambient temperature and humidity, the system adaptively switches the dehumidification mode during operation. The dehumidification mode includes a single rotor dehumidification mode, a single heat pump dehumidification mode and a compound dehumidification mode. The system includes the following steps: A. System standby (210): When the relative humidity of the environment is less than 50%, the system is in standby mode; B. Release standby: When the relative humidity of the environment is ≥50% (220), the system will release the standby state, start the Roots blower (230), and select the operation mode according to the ambient temperature: when the ambient temperature is less than 14℃, the single rotor dehumidification mode will be operated; when 14℃≤ambient temperature (240)<26℃, the single heat pump dehumidification mode will be operated; when the ambient temperature is ≥26℃, the compound dehumidification mode will be operated; C. Ambient humidity judgment: After the set time Δt1, the ambient relative humidity is judged again. If the ambient relative humidity is ≥50%, the system will remain in operation; if the ambient relative humidity is <50%, all operating components will be shut down and the system will return to standby mode until the next judgment after Δt1.

2. The control method of the heat pump driven composite dehumidification system according to claim 1, characterized in that: Specifically, when the ambient temperature is less than 14°C, the compressor is not started, only the rotary wheel and the heater (251) are started, the ambient temperature and humidity are read by the temperature and humidity sensor, the rotary wheel gear and the heater power (252) are set according to the corresponding preset values, and it is judged whether the ambient temperature is ≥14°C (253) at every set time Δt. If so, the rotary wheel and the heater (254) are turned off, the compressor is started, and it is judged whether the ambient temperature satisfies 14°C≤ambient temperature<26°C at every set time Δt. If so, it is switched to the single heat pump dehumidification mode; and it is judged whether the ambient temperature is ≥26°C at every set time Δt. If so, it is switched to the compound dehumidification mode.

3. The control method of the heat pump driven composite dehumidification system according to claim 2, characterized in that: Specifically, the single heat pump dehumidification mode starts the compressor (260) and the expansion valve for heat pump dehumidification when the ambient temperature is 14°C ≤ <26°C, reads the ambient temperature and humidity through the temperature and humidity sensor, and adjusts the compressor speed and the expansion valve opening according to preset values; determines whether the ambient temperature is ≥26°C (270) at set time intervals Δt, and if so, switches to the composite dehumidification mode; determines whether the ambient temperature is <14°C at set time intervals Δt, and if so, turns off the compressor and switches to the single wheel dehumidification mode.

4. The control method of the heat pump driven composite dehumidification system according to claim 3, characterized in that: The composite dehumidification mode is specifically to start the compressor, the rotor and the heater (291) at the same time when the ambient temperature is ≥26°C, so as to realize the combined dehumidification of the heat pump and the rotor, read the ambient temperature and humidity through the temperature and humidity sensor, set the compressor speed, the expansion valve opening, the rotor gear and the heater power according to the corresponding preset values, and check whether the ambient temperature is less than 14°C at every set time Δt. If so, turn off the compressor and switch to the single rotor dehumidification mode; check whether the ambient temperature satisfies 14°C≤ambient temperature<26°C (293) at every set time Δt. If so, switch to the single heat pump dehumidification mode.

5. The control method of the heat pump driven composite dehumidification system according to claim 4, characterized in that: The number of the Roots blowers is two.

Images