Air conditioner, compressor operation control method and system thereof and storage medium

Abstract

The invention discloses an air conditioner, a compressor operation control method and system thereof and a storage medium. The control method comprises the steps that air conditioner environment data are collected in real time, wherein the air conditioner environment data comprise the evaporator rear side temperature T1, the air supply temperature T2, the air return temperature, the temperature of all cabins and the humidity of all the cabins; a control target temperature Tcm is obtained according to the temperature of each cabin or the return air temperature; the current working mode of the air conditioner is determined, whether Tcm, T1, T2 and cabin humidity meet the compressor loading criterion or load shedding criterion in the corresponding mode or not is judged, if yes, corresponding compressor loading or load shedding is conducted, and if not, the compressor is kept in the current running state; while the temperature and humidity of the cabin are adopted as judgment conditions, the refrigerant temperature is represented through the rear side temperature of the evaporator, the accuracy of indoor unit condition judgment is enhanced through the air supply temperature, pressure protection shutdown faults caused by high and low pressure anomalies are effectively reduced, a compressor is protected, the reliability of a unit is enhanced, and the service life of the unit is prolonged. And a reliable indoor environment is provided for the cabin.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning equipment, and in particular to an air-conditioner and a compressor operation control method and system, as well as a storage medium thereof. Background Art

[0002] LNG carriers are ships designed specifically to transport liquefied natural gas. They are one of the most difficult ships to build in the world, with high technical requirements and high construction costs. The indoor environment required by the LNG carrier's liquid cargo tanks must meet the requirements in any climatic environment. Therefore, it is particularly important to increase unit reliability and reduce downtime while meeting control requirements.

[0003] Due to the particularity of the construction environment of LNG liquid cargo tanks, the average temperature and humidity of multiple compartments are generally selected as the control target. However, due to the large space of the compartment, it is easy for the unit to fail to reach the predetermined temperature and humidity for a long time, and some processes during the construction process will cause changes in the environment in the compartment. Simply making loading and unloading decisions based on the control target temperature and humidity may easily cause the external unit to be loaded or run at full load for a long time, which in turn may cause the unit to shut down due to pressure protection, and damage the compressor. In cooling mode, it may easily cause the refrigerant temperature to be too low, that is, the refrigerant pressure to be too low, resulting in the suction pressure being lower than the protection pressure and causing a low-pressure protection shutdown; in heating mode, it may easily cause the condensing temperature to be too high, that is, the condensing pressure to increase, resulting in the exhaust pressure being higher than the protection pressure and causing a high-pressure protection shutdown. Summary of the Invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides an air conditioner and a compressor operation control method and system, as well as a storage medium.

[0005] The present invention adopts the following technical solutions:

[0006] A first aspect of the present invention provides an air-conditioning compressor operation control method, comprising:

[0007] Real-time collection of air conditioning environment data, including evaporator rear side temperature T1, supply air temperature T2, return air temperature, each compartment temperature and each compartment humidity;

[0008] The control target temperature T is obtained according to the temperature of each cabin or the return air temperature cm ;

[0009] Determine the current working mode of the air conditioner and judge T cm , T1, T2 and cabin humidity meet the compressor loading criterion or unloading criterion in the corresponding mode. If they meet, the compressor will be loaded or unloaded accordingly. If they do not meet the criteria, the compressor will maintain the current operating state.

[0010] According to the air-conditioning compressor operation control method, the control target temperature T is obtained according to the temperature of each compartment or T2.cm ,include:

[0011] Select any cabin and take the lowest or highest temperature of the cabin within the set time as T cm ; or the arithmetic mean temperature of all compartments is T cm ; or return air temperature is T cm .

[0012] According to the air-conditioning compressor operation control method, the compressor loading criterion in the cooling mode is that any of the following conditions are met within a set continuous detection time:

[0013] (1)T cm >T mc +ΔT m Or humidity in any compartment>H m +ΔH m ;

[0014] (2)T1>T col ;

[0015] (3)T2>T col ;

[0016] Among them, T mc is the cooling target temperature, ΔT m is the target temperature tolerance, H m is the target humidity, ΔH m is the target humidity tolerance, T col The minimum temperature for reducing the load of the refrigeration compressor.

[0017] According to the air-conditioning compressor operation control method, the compressor load reduction criterion in the cooling mode is that any of the following conditions are met within a set continuous detection time:

[0018] (1)T cm <T mc -ΔT m And the humidity in each cabin <H m -ΔH m ;

[0019] (2)T1 <T coh ;

[0020] (3)T2 <T coh ;

[0021] Among them, T mc is the cooling target temperature, ΔT m is the target temperature tolerance, H m is the target humidity, ΔH m is the target humidity tolerance, T coh The maximum temperature for reducing the load on the refrigeration compressor.

[0022] According to the air conditioner compressor operation control method, the compressor loading criterion in the heating mode is that the following conditions are met simultaneously within a set continuous detection time:

[0023] (1) T cm <T mh -ΔT m and each cabin humidity < H m +ΔH m ;

[0024] (2) T1 < T hol ;

[0025] (3) T2 < T hol ;

[0026] wherein T mh is a heating target temperature, ΔT m is a target temperature tolerance, H m is a target humidity, ΔH m is a target humidity tolerance, and T hol is a heating compressor unloading minimum temperature.

[0027] According to the air conditioner compressor operation control method, the compressor unloading criterion in the heating mode is that any of the following conditions is met within a set continuous detection time:

[0028] (1) T cm >T mh +ΔT m and each cabin humidity < H m -ΔH m ;

[0029] (2) T1 > T hoh ;

[0030] (3) T2 > T hoh ;

[0031] wherein T mh is a heating target temperature, ΔT m is a target temperature tolerance, H m is a target humidity, ΔH m is a target humidity tolerance, and T hoh is a heating compressor unloading minimum temperature.

[0032] The second aspect of the present application provides a control system for operating the above method, the system comprising:

[0033] a data acquisition module for acquiring air conditioner environment data in real time, including evaporator backside temperature T1, supply air temperature T2, return air temperature, cabin temperature and cabin humidity.

[0034] Parameter calculation module, used to obtain the control target temperature T according to the temperature of each cabin or the return air temperature cm ;

[0035] Control module, used to determine the current working mode of the air conditioner and judge T cm , T1, T2 and cabin humidity meet the compressor loading criterion or unloading criterion in the corresponding mode. If they meet, the compressor will be loaded or unloaded accordingly. If they do not meet the criteria, the compressor will maintain the current operating state.

[0036] A third aspect of the present invention provides an air conditioner comprising the above-mentioned control system.

[0037] A fourth aspect of the present invention provides a storage medium, which includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the above-mentioned air-conditioning compressor operation control method.

[0038] Compared with the prior art, the beneficial effects of the present invention include at least:

[0039] 1. While using cabin temperature and humidity as judgment conditions, the present invention also uses the evaporator rear temperature to characterize the refrigerant temperature, and the supply air temperature to enhance the accuracy of indoor unit condition judgment. This reduces the error and position of the sensor detecting the evaporator rear temperature, thereby avoiding shutdowns caused by excessively high or low refrigerant temperatures, and at the same time, enables the air conditioner to provide a reliable environment for the LNG carrier's cargo tank.

[0040] 2. The present invention uses a control system to comprehensively judge and control the loading and unloading of the outdoor unit compressor based on the cabin room temperature and humidity, the temperature at the rear side of the evaporator and the supply air temperature. This can effectively reduce pressure protection shutdown failures caused by high and low pressure anomalies, thereby protecting the compressor and enhancing the reliability of the unit, providing a reliable indoor environment for the LNG liquid cargo tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0042] Figure 1 This is a flow chart of the air-conditioning compressor operation control method of the present invention;

[0043] Figure 2 This is a cooling mode control flow chart of Example 2 of the present invention;

[0044] Figure 3 The control flow chart for the heating mode of the embodiment 2 of the present application;

[0045] Figure 4 The system schematic diagram of the air conditioner of the present application.

[0046] In the figure: 1, compressor; 2, outdoor fan; 3, condenser; 4, evaporator; 5, indoor fan. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present disclosure will be clearly and completely described with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and not intended to limit the present disclosure and its applications or uses in any way. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present disclosure.

[0048] Unless otherwise specifically stated, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the various examples are not limiting of the scope of the present disclosure.

[0049] At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship.

[0050] The techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the authorized description where appropriate.

[0051] In all the examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not as a limitation. Thus, other examples of the example embodiments can have different values.

[0052] It should be noted that: similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0053] As Figure 4 shown, the whole system outdoor unit is a screw compressor, and the indoor unit is a dehumidification heat pump, and the indoor and outdoor unit structures are integrated. The indoor unit is responsible for judging the compressor loading and unloading according to the selected control target and sending it to the outdoor unit for execution.

[0054] As Figure 1 shown, the embodiment 1 of the present application provides an air conditioner compressor operation control method, which specifically includes the following steps:

[0055] Step 1: Real-time collection of air conditioning environment data, including evaporator rear side temperature T1, supply air temperature T2, return air temperature, each compartment temperature and each compartment humidity;

[0056] In cooling mode, the evaporator evaporates the refrigerant, which represents the refrigerant temperature in cooling mode; when in heating mode, the evaporator acts as a condenser to condense the refrigerant, which represents the refrigerant temperature in heating mode.

[0057] Step 2: Get the control target temperature T according to the temperature of each cabin or the return air temperature cm ;

[0058] The control target temperature T is obtained according to the temperature of each compartment or T2 cm ,include:

[0059] Select any cabin and take the lowest or highest temperature of the cabin within the set time as T cm ; or the arithmetic mean temperature of all compartments is T cm ; or return air temperature is T cm .

[0060] Step 3: Determine the current working mode of the air conditioner and judge T cm , T1, T2 and cabin humidity meet the compressor loading criterion or unloading criterion in the corresponding mode. If they meet, the compressor will be loaded or unloaded accordingly. If they do not meet the criteria, the compressor will maintain the current operating state.

[0061] like Figure 2 or Figure 3 As shown, embodiment 2 of the present invention provides an air-conditioning compressor operation control method. As one of the outstanding essential features of the present invention, embodiment 2 of the present invention provides an optimal technical means for controlling the external unit of the air-conditioning in cooling / heating mode.

[0062] Specifically, the control method includes:

[0063] The compressor loading criterion in cooling mode is that any of the following conditions are met within the set continuous detection time:

[0064] (1)T cm >T mc +ΔT m Or humidity in any compartment H any >H m +ΔH m ;

[0065] (2)T1>T col ;

[0066] (3)T2>T col ;

[0067] Among them, T mc is the cooling target temperature, ΔT m is the target temperature tolerance, H m is the target humidity, ΔH m

[0068] is the target humidity tolerance, T col The minimum temperature for reducing the load of the refrigeration compressor.

[0069] Humidity H in any of the above compartments any For any cabin among all cabins, that is, if one cabin meets the above conditions, all the judgment conditions are met.

[0070] The criterion for compressor load reduction in cooling mode is that any of the following conditions are met within the set continuous detection time:

[0071] (1)T cm <T mc -ΔT m And the humidity in each cabin is H all <H m -ΔH m ;

[0072] (2)T1 <T coh ;

[0073] (3)T2 <T coh ;

[0074] Among them, T mc is the cooling target temperature, ΔT m is the target temperature tolerance, H m is the target humidity, ΔH m

[0075] is the target humidity tolerance, T coh The maximum temperature for reducing the load on the refrigeration compressor.

[0076] Humidity H in each of the above compartments all For all cabins, that is, every cabin meets the above conditions, the judgment condition is established.

[0077] The compressor loading criterion in heating mode is that the following conditions are met simultaneously within the set continuous detection time:

[0078] (1)T cm <T mh -ΔT m Or humidity in any compartment>H m +ΔH m ;

[0079] (2)T1 <T hol ;

[0080] (3)T2 <T hol ;

[0081] Among them, T mh is the heating target temperature, ΔT m is the target temperature tolerance, H m is the target humidity, ΔH m is the target humidity tolerance, T hol Minimum temperature for reducing the load on the heating compressor.

[0082] The criterion for compressor load reduction in heating mode is that any of the following conditions are met within the set continuous detection time:

[0083] (1)T cm >T mh +ΔT m And the humidity in each cabin <H m -ΔH m ;

[0084] (2)T1>T hoh ;

[0085] (3)T2>T hoh ;

[0086] Among them, T mh is the heating target temperature, ΔT m is the target temperature tolerance, H m is the target humidity, ΔH m is the target humidity tolerance, T hoh Minimum temperature for reducing the load on the heating compressor.

[0087] Where T col >T coh , T hol <T hoh .

[0088] As a prominent substantive feature of the present invention and one of the significant improvements it brings to the prior art, the present invention not only uses the cabin room temperature and humidity as judgment conditions, but also adds the temperature of the rear side of the evaporator as a judgment condition. In the prior art, when only the cabin room temperature and humidity are used as judgment conditions to control the external unit, it is easy to cause the refrigerant temperature to be too low and shut down in the cooling mode, and the refrigerant temperature to be too high and shut down in the heating mode. Therefore, the present invention uses the temperature of the rear side of the evaporator to characterize the refrigerant temperature, thereby avoiding shutdowns caused by the refrigerant temperature being too high or too low, and at the same time enabling the air conditioner to provide a reliable environment for the liquid cargo tank of the LNG ship.

[0089] Since the distribution of the sensors used to detect the temperature at the rear of the evaporator and the possible deviations in the sensors themselves may affect the accuracy of the refrigerant temperature representation, according to the actual structure of the unit, when the unit is running, the measured values ​​of the supply air temperature and the temperature at the rear of the evaporator are roughly the same. The supply air temperature is used to enhance the accuracy of the judgment of the internal unit condition, thereby reducing the error and position of the sensor for detecting the temperature at the rear of the evaporator, further enabling the air conditioner to provide a reliable environment for the liquid cargo tank of the LNG ship, and further avoiding shutdowns caused by excessively high or low refrigerant temperatures.

[0090] Embodiment 3 of the present invention provides a control system, including:

[0091] Data acquisition module, used to collect air conditioning environment data in real time, including evaporator rear side temperature T1, supply air temperature T2, return air temperature, each compartment temperature and each compartment humidity;

[0092] Parameter calculation module, used to obtain the control target temperature T according to the temperature of each cabin or the return air temperature cm ;

[0093] Control module, used to determine the current working mode of the air conditioner and judge T cm , T1, T2 and cabin humidity meet the compressor loading criterion or unloading criterion in the corresponding mode. If they meet, the compressor will be loaded or unloaded accordingly. If they do not meet the criteria, the compressor will maintain the current operating state.

[0094] Embodiment 4 of the present invention provides an air conditioner, comprising the control system described in embodiment 3.

[0095] Embodiment 5 of the present invention provides a storage medium storing a computer program. When the computer program is executed by a processor, the air-conditioning compressor operation control method according to embodiment 1 or 2 is implemented.

[0096] Storage media can be any available media that can be accessed by a computing device. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other storage medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computing device. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, or twisted pair, then the coaxial cable, fiber optic cable, or twisted pair are included in the definition of medium. Disk and disc, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), and Blu-Ray® disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0097] In other embodiments, the computing device 100 includes one or more input devices 102, one or more output devices 104, one or more communication interfaces 106, and one or more storage devices 108. The input device 102 can include, for example, a keyboard, a mouse, a trackpad, a trackball, a touchscreen, a microphone, a camera, a scanner, a network interface, a wireless interface, or any other input device. The output device 104 can include, for example, a display, a monitor, a speaker, a printer, a network interface, a wireless interface, or any other output device. The communication interface 106 can include, for example, a network interface, a wireless interface, or any other communication interface. The storage device 108 can include, for example, a hard drive, a solid state drive, a flash drive, a memory card, a floppy disk, a zip disk, a CD-ROM, a DVD, a Blu-Ray® disc, a magnetic tape, or any other storage device.

[0098] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, and conventional procedural programming languages ​​such as "C" language or similar programming languages. Computer-readable program instructions may be executed entirely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., utilizing an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be personalized by utilizing the state information of the computer-readable program instructions. The electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for controlling the operation of an air-conditioning compressor, characterized in that: include: Real-time collection of air conditioning environment data, including evaporator rear side temperature T1, supply air temperature T2, return air temperature, each compartment temperature and each compartment humidity; The control target temperature T is obtained according to the temperature of each cabin or the return air temperature cm ; Determine the current working mode of the air conditioner and judge T cm , T1, T2 and cabin humidity meet the compressor loading criterion or unloading criterion in the corresponding mode. If they meet, the compressor will be loaded or unloaded accordingly. If they do not meet the criteria, the compressor will maintain the current operating state.

2. The air-conditioning compressor operation control method according to claim 1, characterized in that: The control target temperature T is obtained according to the temperature of each compartment or T2 cm ,include: Select any cabin and take the lowest or highest temperature of the cabin within the set time as T cm ; or the arithmetic mean temperature of all compartments is T cm ; or return air temperature is T cm .

3. The air-conditioning compressor operation control method according to claim 1, characterized in that: The compressor loading criterion in cooling mode is that any of the following conditions are met within the set continuous detection time: (1)T cm >T mc +ΔT m Or humidity in any compartment>H m +ΔH m ; (2)T1>T col ; (3)T2>T col ; Among them, T mc is the cooling target temperature, ΔT m is the target temperature tolerance, H m is the target humidity, ΔH m is the target humidity tolerance, T col The minimum temperature for reducing the load of the refrigeration compressor.

4. The air-conditioning compressor operation control method according to claim 1, characterized in that: The criterion for compressor load reduction in cooling mode is that any of the following conditions are met within the set continuous detection time: (1)T cm <T mc -ΔT m And the humidity in each cabin <H m -ΔH m ; (2)T1 <T coh ; (3)T2 <T coh ; Among them, T mc is the cooling target temperature, ΔT m is the target temperature tolerance, H m is the target humidity, ΔH m is the target humidity tolerance, T coh The maximum temperature for reducing the load on the refrigeration compressor.

5. The air-conditioning compressor operation control method according to claim 1, characterized in that: The compressor loading criterion in heating mode is that the following conditions are met simultaneously within the set continuous detection time: (1)T cm <T mh -ΔT m Or humidity in any compartment>H m +ΔH m ; (2)T1 <T hol ; (3)T2 <T hol ; Among them, T mh is the heating target temperature, ΔT m is the target temperature tolerance, H m is the target humidity, ΔH m is the target humidity tolerance, T hol Minimum temperature for reducing the load on the heating compressor.

6. The air-conditioning compressor operation control method according to claim 1, characterized in that: The criterion for compressor load reduction in heating mode is that any of the following conditions are met within the set continuous detection time: (1)T cm >T mh +ΔT m And the humidity in each cabin <H m -ΔH m ; (2)T1>T hoh ; (3)T2>T hoh ; Among them, T mh is the heating target temperature, ΔT m is the target temperature tolerance, H m is the target humidity, ΔH m is the target humidity tolerance, T hoh Minimum temperature for reducing the load on the heating compressor.

7. An air-conditioning compressor operation control system, used to execute the method according to any one of claims 1 to 6, characterized in that: The system comprises: Data acquisition module, used to collect real-time air conditioning environment data, including evaporator rear side temperature T1, supply air temperature T2, return air temperature, each compartment temperature and each compartment humidity; Parameter calculation module, used to obtain the control target temperature T according to the temperature of each cabin or the return air temperature cm ; Control module, used to determine the current working mode of the air conditioner and judge T cm , T1, T2 and cabin humidity meet the compressor loading criterion or unloading criterion in the corresponding mode. If they meet, the compressor will be loaded or unloaded accordingly. If they do not meet the criteria, the compressor will maintain the current operating state.

8. An air conditioner, characterized in that: Includes the control system according to claim 7.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the air-conditioning compressor operation control method according to any one of claims 1 to 6.

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