A control method for temperature and humidity energy-saving air conditioning in a cool storage

Abstract

The invention discloses a control method for a temperature and humidity energy-saving air conditioner in a cool storage, which belongs to the technical field of air conditioning. A temperature and humidity energy-saving regulating system is used to regulate the cool storage. The temperature and humidity energy-saving regulating system comprises a temperature and humidity energy-saving air conditioner, which is arranged in the cool storage. The temperature and humidity energy-saving air conditioner is proportionally configured according to the heat and humidity load of the cool storage. While meeting the requirements of temperature and humidity regulation and reducing the layout cost, a temperature control priority strategy is adopted to evenly regulate the air intake volume and the power supply frequency of the air conditioning cabinet, so that the air conditioning cabinet always works in the highest efficiency range, thereby playing a role of energy saving.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning, and in particular to a control method for a temperature and humidity energy-saving air conditioner in a cool storage. Background Art

[0002] At present, in the fields of logistics warehousing, breeding and industrial production, it is necessary to control the air temperature and flow in the enclosed space to meet the environmental requirements of storage, production or breeding. For example, the temperature of the pharmaceutical storage cool warehouse is required to be 0-20℃ and the relative humidity is required to be 35%-75%. Because the cold load of the pharmaceutical storage cool warehouse is usually very large, large-scale chillers are generally used for centralized cooling, and the temperature and humidity are controlled by the terminal of the chilled water in the cool warehouse. Since the temperature in the cool warehouse must be stabilized at around 18℃ and the relative humidity is kept below 70%, the dew point of the air in the cool warehouse is already relatively low. Under the conventional 7-12℃ supply and return water conditions, the dehumidification capacity is very poor. In addition, since the relative humidity of the supply air is usually around 95%, the control of relative humidity is a major problem, especially in the transitional season, the wet load is very large, and it is necessary to add additional industrial dehumidifiers, electric heating reheating and other high-energy consumption measures to solve it.

[0003] The existing patent application with publication number CN116753664A discloses a cold storage humidity control method, device and cold storage air conditioning unit, wherein the method includes: determining the optimal humidity of the target area and detecting the current humidity of the target area; judging whether the current humidity is lower than the optimal humidity; when the current humidity is lower than the optimal humidity, humidifying the target area through the humidification device corresponding to the target area, or humidifying the target area through the humidification device corresponding to the target area and the humidification device corresponding to the adjacent area of ​​the target area. The cold storage humidity control method requires special humidification equipment to control the humidity, and the equipment occupies a lot. It adopts a temperature priority strategy, fails to fully utilize the dehumidification effect of the ventilation equipment in the cool storage, and consumes a lot of energy. Summary of the invention

[0004] The purpose of the present invention is to provide a control method for temperature and humidity energy-saving air conditioning in a cool storage. Under the condition that the quality of the cold source remains unchanged, by controlling the frequency and air intake volume of the air conditioning cabinet, a temperature priority strategy is adopted, and the refrigeration capacity and dehumidification capacity are automatically adjusted according to the heat and humidity load of the air conditioning. The method can always work in the highest efficiency range of the air conditioning cabinet, thus solving the problem of high energy consumption for heat preservation and moisture retention.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0006] A control method for a temperature and humidity energy-saving air conditioner in a cool storage, wherein the control method is implemented by using a temperature and humidity energy-saving air conditioner, wherein the temperature and humidity energy-saving air conditioner is arranged in the cool storage, and the control method comprises the following steps:

[0007] Step S1, set the initial T1, RH1 and fmin, where T1 is the temperature to be maintained, RH1 is the humidity to be maintained, and fmin is the minimum power supply frequency for the operation of the temperature and humidity energy-saving air conditioner;

[0008] Step S2, obtaining the current temperature T in the cool storage, determining whether T>T1 is established, if so, proceeding to step S3, otherwise proceeding to step S11, first determining whether the temperature meets the storage conditions;

[0009] Step S3, start the temperature and humidity energy-saving air conditioner to control the temperature;

[0010] Step S4, determine whether T>T1 is established, if so, execute step S5, if not, execute step S13;

[0011] Step S5, increasing the power supply frequency of the temperature and humidity energy-saving air conditioner;

[0012] Step S6, obtaining the current power supply frequency of the temperature and humidity energy-saving air conditioner, and determining whether f>fmax is established. If so, proceed to step S7; if not, proceed to step S4, wherein fmax is the maximum power supply frequency of the temperature and humidity energy-saving air conditioner;

[0013] Step S7, determine whether T>T1 is established, if yes, execute step S8, if not, execute step S13;

[0014] Step S8, increasing the opening of the air volume valve in the cool storage;

[0015] Step S9, determine whether the air volume valve is opened to the maximum, if yes, execute step S10, if not, execute step S7;

[0016] Step S10, sending out an alarm signal;

[0017] Step S11, obtaining the current humidity RH in the cool storage, and determining whether RH>RH1 is established, if so, executing step S12;

[0018] Step S12, start the temperature and humidity energy-saving air conditioner to control the temperature;

[0019] Step S13, determine whether RH>RH1 is established, if yes, execute step S14, if not, return to step S1;

[0020] Step S14, reducing the opening of the air volume valve;

[0021] Step S15, determine whether T>T1 is established, if yes, execute step S5, if not, execute step S16;

[0022] Step S16, determine whether RH>RH1 is established, if yes, execute step S17, if not, proceed to step S22;

[0023] Step S17, closing the air volume valve;

[0024] Step S18, determine whether RH>RH1 is established, if yes, execute step S19, if not, execute step S22. Step S19, reduce the operating frequency of the temperature and humidity energy-saving air conditioner;

[0025] Step S20, determine whether T>T1 is established, if so, execute step S5, if not, execute step S21;

[0026] Step S21, determine whether f=fmin and RH>RH1 are both true, if so, proceed to step S10, if not, proceed to step S16;

[0027] Step S22, increase the opening of the air volume valve, and then execute step S16, adopting a temperature control priority strategy to make the temperature and humidity energy-saving air conditioner always work at the highest efficiency, reducing energy consumption.

[0028] Preferably, the alarm signal includes an alarm sound, flashing lights, and buzzer vibrations, which are used to prompt that manual processing is required.

[0029] Furthermore, the temperature and humidity energy-saving air conditioner includes a chassis, a first energy recovery heat exchanger, a surface cooler and an exhaust fan. The chassis is provided with an air supply port and a return air port. The first energy recovery heat exchanger is arranged in the chassis. The first energy recovery heat exchanger includes a first heat exchange channel and a second heat exchange channel. The first heat exchange channel connects the return air port and the air inlet end of the exhaust fan, and the second heat exchange channel connects the air supply port and the air outlet end of the exhaust fan. The surface cooler is arranged on the air inlet end of the exhaust fan.

[0030] Preferably, the exhaust fan is controlled by a frequency converter, which is accurate and energy-saving.

[0031] Furthermore, the first heat exchange channel and the second heat exchange channel are arranged in a staggered manner to improve heat exchange efficiency and simplify the structure.

[0032] More preferably, the surface cooler is a fin-type heat exchanger, which occupies little space and has high heat dissipation efficiency.

[0033] Preferably, the air volume valve is arranged between the first energy recovery heat exchanger and the surface cooler, and is used to control the air volume of the first heat exchange channel passing through the first energy recovery heat exchanger.

[0034] Preferably, the air supply port and the air return port are respectively arranged on two adjacent side walls of the chassis, and the air supply port is arranged upward or horizontally to facilitate indoor air circulation and dehumidification.

[0035] More preferably, the first energy recovery heat exchanger is a plate-type sensible heat energy recovery heat exchanger.

[0036] More preferably, it further comprises a temperature regulating device, which is arranged on the chassis, and the temperature and humidity regulating device is used to control the temperature and humidity of the entire cool storage.

[0037] The beneficial effects of the present invention are:

[0038] (1) The temperature and humidity energy-saving air conditioner includes a first energy recovery heat exchanger, a surface cooler, an exhaust fan, and an air supply port and a return air port arranged on a chassis. The first energy recovery heat exchanger is used to exchange heat between the indoor air entering the return air port and the air supplied, so that the air entering the first energy recovery heat exchanger and the air supplied by the first energy recovery heat exchanger exchange sensible heat, thereby reducing the temperature of the air entering the surface cooler and increasing its relative humidity to 100%. This greatly improves the dehumidification capacity of the surface cooler. At the same time, the temperature of the exhausted air is adjusted to reduce the relative humidity of the supplied air. The air conditioner uses the internal circulation of air to perform efficient dehumidification without the need for a special dehumidifier. The air conditioner has high dehumidification efficiency and reduces the relative humidity of the supplied air, directly meeting the indoor air temperature usage requirements.

[0039] (2) The control method of the temperature and humidity energy-saving air conditioner in the cool storage adopts the strategy of giving priority to adjusting the temperature in the cool storage, and uses the temperature and humidity energy-saving air conditioner to adjust the temperature and humidity in the cool storage. By cyclically controlling the power supply frequency and the opening of the air valve of the temperature and humidity energy-saving air conditioner, the heat exchange rate of the first energy recovery heat exchanger and the heat exchange rate of the surface cooler are changed, so that the total heat exchange rate and latent heat ratio of the entire temperature and humidity energy-saving air conditioner can be adjusted. Under the condition of meeting the temperature and humidity of the stored objects, the temperature and humidity energy-saving air conditioner can work in the highest efficiency range to achieve the purpose of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A flow chart of a method for controlling a temperature and humidity energy-saving air conditioner provided by the present invention;

[0041] Figure 2 This is a composition diagram of the energy-saving air conditioner provided by the present invention.

[0042] Reference numerals:

[0043] 2. Temperature and humidity energy-saving air conditioner; 21. Chassis; 22. First energy recovery heat exchanger; 23. Surface cooler; 24. Exhaust fan; 25. Air volume valve; 26. Air supply outlet; 27. Return air outlet. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] like Figure 1 and Figure 2 As shown, a temperature and humidity energy-saving air conditioner 2 includes a chassis 21, a first energy recovery heat exchanger 22, a surface cooler 23 and an exhaust fan 24. The chassis 21 is provided with an air supply port 26 and a return air port 27. The first energy recovery heat exchanger 22 is arranged in the chassis 21. The first energy recovery heat exchanger 22 includes a first heat exchange channel and a second heat exchange channel. The first heat exchange channel connects the return air port 27 and the air inlet end of the exhaust fan 24, and the second heat exchange channel connects the air supply port 26 and the air outlet end of the exhaust fan 24. The surface cooler 23 is arranged on the air inlet end of the exhaust fan 24, and circulates the indoor air through the first energy recovery heat exchanger 22.

[0046] Preferably, the first energy recovery heat exchanger 22 is a plate-type sensible heat energy recovery heat exchanger.

[0047] Preferably, the first heat exchange channel and the second heat exchange channel are arranged alternately, and the flow area in the first heat exchange channel and the second heat exchange channel should not be too small to avoid increasing the air pressure drop of the energy recovery heat exchanger.

[0048] Preferably, the surface cooler 23 is a fin-type heat exchanger, which can increase the heat exchange effect by increasing the number of tube rows and improving the fin form, and has flexible configuration. The principle of the surface cooler 23 is to allow the heat medium or coolant or refrigerant to flow through the inner cavity of the metal pipe, and the air to be treated flows through the outer wall of the metal pipe for heat exchange to achieve the purpose of heating or cooling the air. It is used here, and the heat exchange and refrigeration capacity of the surface cooler 23 is utilized to reduce the temperature of the passing air. At the same time, the water in the air condenses into water when it is cold, thereby reducing the moisture in the air.

[0049] Preferably, the supply air outlet 26 and the return air outlet 27 are respectively arranged on two adjacent side walls of the chassis 21, the supply air outlet 26 is arranged upward or horizontally, the return air outlet 27 is connected to the first heat exchange channel, the supply air outlet 26 is connected to the second heat exchange channel, and the supply air outlet 26 and the return air outlet 27 are staggered to improve the dehumidification efficiency of the indoor air.

[0050] Among them, the exhaust fan 24 is a centrifugal fan, which can be motor-direct-connected or belt-driven according to the structure, can be single or multiple in parallel, and is controlled by a frequency converter to achieve energy saving.

[0051] Preferably, a temperature regulating device 37 is further included, and the temperature regulating device 37 is arranged on the chassis 21 for an operator to set parameters.

[0052] The present invention also discloses a control method of a temperature and humidity energy-saving air conditioner 2 for a cool storage, wherein the temperature and humidity energy-saving air conditioner 2 is used to adjust the temperature and humidity environmental parameters of the cool storage, and the temperature and humidity energy-saving air conditioner 2 is arranged in the cool storage. The specific control method includes the following steps:

[0053] Step S1, set the initial T1, RH1 and fmin, where T1 is the temperature to be maintained, RH1 is the humidity to be maintained, and fmin is the minimum power supply frequency for the operation of the temperature and humidity energy-saving air conditioner 2. Each set value can meet the storage requirements of the stored objects in the cool warehouse. More specifically, the minimum power supply frequency refers to the minimum operating frequency of the exhaust fan 24 for ventilating the surface cooler 23;

[0054] Step S2, obtaining the current temperature T in the cool storage, and determining whether T>T1 is established, if so, executing to step S3, if not, executing to step S11;

[0055] Step S3, start the temperature and humidity energy-saving air conditioner 2 to control the temperature;

[0056] Step S4, determine whether T>T1 is established, if so, execute step S5, if not, execute step S13;

[0057] Step S5, increasing the power supply frequency of the temperature and humidity energy-saving air conditioner 2;

[0058] Step S6, obtaining the current power supply frequency of the temperature and humidity energy-saving air conditioner 2, and determining whether f>fmax is established. If so, proceed to step S7; if not, proceed to step S4, wherein fmax is the maximum power supply frequency of the temperature and humidity energy-saving air conditioner 2;

[0059] Step S7, determine whether T>T1 is established, if yes, execute step S8, if not, execute step S13;

[0060] Step S8, increasing the opening of the air volume valve 25 in the cool storage;

[0061] Step S9, determine whether the air volume valve 25 is opened to the maximum, if yes, execute step S10, if not, execute step S7;

[0062] Step S10, sending out an alarm signal;

[0063] Step S11, obtaining the current humidity RH in the cool storage, and determining whether RH>RH1 is established, if so, executing step S12;

[0064] Step S12, start the temperature and humidity energy-saving air conditioner 2 to control the temperature;

[0065] Step S13, determine whether RH>RH1 is established, if yes, execute step S14, if not, return to step S1;

[0066] Step S14, reducing the opening of the air volume valve 25;

[0067] Step S15, determine whether T>T1 is established, if yes, execute step S5, if not, execute step S16;

[0068] Step S16, determine whether RH>RH1 is established, if yes, execute step S17, if not, proceed to step S22;

[0069] Step S17, closing the air volume valve 25;

[0070] Step S18, determine whether RH>RH1 is established, if yes, execute step S19, if not, execute step S22. Step S19, reduce the operating frequency of the temperature and humidity energy-saving air conditioner 2;

[0071] Step S20, determine whether T>T1 is established, if so, execute to step S5, if not, execute to step S21;

[0072] Step S21, determine whether f=fmin and RH>RH1 are both true, if so, execute step S10, if not, execute step S16;

[0073] Step S22, increase the opening of the air volume valve 25, and then execute step S16.

[0074] More specifically, the temperature and humidity energy-saving air conditioner 2 controls the temperature in the cool storage by frequency conversion, and the air volume valve 25 controls the air intake to control the relative humidity; the principle of giving priority to temperature control is adopted. If the temperature is higher than the set value, the fan frequency of the temperature and humidity energy-saving air conditioner 2 will gradually increase to the maximum, and the air volume valve 25 will also be opened to the maximum to meet the requirements of quickly discharging heat and lowering the temperature. In this case, if the temperature still exceeds the set value, an alarm will be triggered and manual processing is required; when the temperature can be maintained at the set value and the temperature is controlled, if the humidity in the cool storage exceeds the standard, the opening of the air valve will gradually decrease. If the temperature exceeds the set value during the gradual decrease in the opening of the air valve, it will jump back to the temperature control cycle. If the temperature The temperature and humidity in the cool storage can be maintained at the set value, and the opening is adjusted by circulating the air valve to stabilize the humidity in the cool storage near the set value; if the air valve is completely closed, and the humidity in the cool storage still exceeds the standard, the fan of the temperature and humidity energy-saving air conditioner 2 will be reduced in frequency. Since the cooling capacity of the temperature and humidity energy-saving air conditioner 2 will be reduced when the frequency is reduced, it is necessary to continuously judge whether the temperature in the cool storage exceeds the set value. Once the temperature in the cool storage exceeds the set value, it will switch to the temperature control cycle; if it does not exceed the set value, the air valve is completely closed, and the temperature and humidity energy-saving air conditioner 2 frequency conversion controls the relative humidity in the cool storage; if the frequency of the temperature and humidity energy-saving air conditioner 2 has been adjusted to the lowest, and the humidity in the cool storage still exceeds the set value, an alarm signal will be issued to notify manual processing;

[0075] Among them, the setting basis of the minimum power supply frequency of the temperature and humidity energy-saving air conditioner 2 is that according to the heat exchange characteristic curve of the surface cooler 23, as the air volume gradually decreases, the dehumidification amount will gradually increase, and an inflection point will appear. More specifically, when the air volume of the exhaust fan 24 is reduced to a certain extent, if the air volume continues to decrease, the dehumidification amount will decrease instead. The frequency corresponding to this inflection point is the minimum power supply frequency, and the temperature and humidity energy-saving air conditioner 2 has the highest working efficiency at this time.

[0076] Furthermore, the temperature and humidity energy-saving adjustment system can control the number of temperature and humidity energy-saving air conditioners 2 and the opening of the air volume valve 25 of the temperature and humidity energy-saving air conditioners 2 according to different heat and humidity loads. The temperature control purpose of the cool storage can be achieved without adding other dehumidification means such as industrial dehumidifiers, thereby achieving the purpose of reducing energy consumption and reducing structural layout costs.

[0077] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also change and modify the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A method for controlling temperature and humidity energy-saving air conditioning in a cool storage, characterized in that: The control method is implemented by using a temperature and humidity energy-saving air conditioner (2). The temperature and humidity energy-saving air conditioner (2) is arranged in a cool storage. The temperature and humidity energy-saving air conditioner (2) comprises a chassis (21), a first energy recovery heat exchanger (22), a surface cooler (23) and an exhaust fan (24). The chassis (21) is provided with an air supply port (26) and an air return port (27). The first energy recovery heat exchanger (22) is arranged in the chassis (21). The first energy recovery heat exchanger (22) comprises a first heat exchange channel and a second heat exchange channel. A heat exchange channel connects the return air port (27) and the air inlet end of the exhaust fan (24); the second heat exchange channel connects the air supply port (26) and the air outlet end of the exhaust fan (24); the surface cooler (23) is arranged on the air inlet end of the exhaust fan (24); an air volume valve (25) is arranged between the first energy recovery heat exchanger (22) and the surface cooler (23) and is used to control the air volume of the first heat exchange channel passing through the first energy recovery heat exchanger (22); the control method comprises the following steps: Step S1, setting initial T1, RH1 and fmin, wherein T1 is the temperature to be maintained, RH1 is the humidity to be maintained, and fmin is the minimum power supply frequency for the operation of the temperature and humidity energy-saving air conditioner (2); The minimum power supply frequency of the temperature and humidity energy-saving air conditioner (2) is set based on the heat exchange characteristic curve of the surface cooler (23). As the air volume gradually decreases, the dehumidification capacity will gradually increase, and an inflection point will appear. When the air volume of the exhaust fan (24) decreases to a certain extent, if the air volume continues to decrease, the dehumidification capacity will decrease instead. The frequency corresponding to this inflection point is the minimum power supply frequency. The air volume valve (25) controls the air volume and thus the relative humidity; Step S2, obtaining the current temperature T in the cool storage, determining whether T>T1 is established, if so, proceeding to step S3, otherwise proceeding to step S11, first determining whether the temperature meets the storage conditions; Step S3, starting the temperature and humidity energy-saving air conditioner (2) to control the temperature; Step S4, determine whether T>T1 is established, if so, execute step S5, if not, execute step S13; Step S5, increasing the power supply frequency of the temperature and humidity energy-saving air conditioner (2); Step S6, obtaining the current power supply frequency of the temperature and humidity energy-saving air conditioner (2), determining whether f>fmax holds, if so, executing step S7, if not, executing step S4, wherein fmax is the maximum power supply frequency of the temperature and humidity energy-saving air conditioner (2); Step S7, determine whether T>T1 is established, if yes, execute step S8, if not, execute step S13; Step S8, increasing the opening of the air volume valve (25) in the cool storage; Step S9, determining whether the air volume valve (25) is opened to the maximum, if yes, executing step S10, if not, executing step S7; Step S10, sending out an alarm signal; Step S11, obtaining the current humidity RH in the cool storage, and determining whether RH>RH1 is established, if so, executing step S12, if not, returning to step S1; Step S12, starting the temperature and humidity energy-saving air conditioner (2) to control the temperature; Step S13, determine whether RH>RH1 is established, if yes, execute step S14, if not, return to step S1; Step S14, reducing the opening of the air volume valve (25); Step S15, determine whether T>T1 is established, if yes, execute step S5, if not, execute step S16; Step S16, determine whether RH>RH1 is established, if yes, execute step S17, if not, proceed to step S22; Step S17, closing the air volume valve (25); Step S18, determine whether RH>RH1 is established, if yes, execute step S19, if not, execute step S22; Step S19, reducing the operating frequency of the temperature and humidity energy-saving air conditioner (2); Step S20, determine whether T>T1 is established, if so, execute step S5, if not, execute step S21; Step S21, determine whether f=fmin and RH>RH1 are both true, if so, execute step S10, if not, execute step S16; Step S22, increase the opening of the air volume valve (25), and then execute step S16.

2. The control method of the temperature and humidity energy-saving air conditioner in a cool storage according to claim 1 is characterized in that: The alarm signal includes an alarm sound, flashing lights, and buzzing vibrations.

3. The control method of the temperature and humidity energy-saving air conditioner in a cool storage according to claim 1 is characterized in that: The exhaust fan (24) is controlled by a frequency converter.

4. The control method of the temperature and humidity energy-saving air conditioner in a cool storage according to claim 1 is characterized in that: The first heat exchange channels and the second heat exchange channels are arranged alternately.

5. The control method of the temperature and humidity energy-saving air conditioner in a cool storage according to claim 1 is characterized in that: The surface cooler (23) is a fin-type heat exchanger.

6. The control method of the temperature and humidity energy-saving air conditioner in a cool storage according to claim 3 is characterized in that: The air supply port (26) and the air return port (27) are respectively arranged on two adjacent side walls of the chassis (21), and the air supply port (26) is arranged upward or horizontally.

7. The control method of the temperature and humidity energy-saving air conditioner in a cool storage according to claim 1 is characterized in that: The first energy recovery heat exchanger (22) is a plate-type sensible heat energy recovery heat exchanger.

8. The control method of the temperature and humidity energy-saving air conditioner in a cool storage according to claim 3 is characterized in that: It also includes a temperature regulating device (37), wherein the temperature regulating device (37) is arranged on the chassis (21).

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