Air conditioner and control method thereof

Abstract

The application provides an air conditioner and a control method thereof. The air conditioner comprises an indoor unit and an outdoor unit. The indoor unit is provided with a fan system and an evaporator. A first temperature control device is arranged on the air inlet side of the evaporator, and a second temperature control device is arranged on the air outlet side of the evaporator. When a cooling and non-dehumidifying mode is operated, the first temperature control device is configured to heat, and the second temperature control device is configured to cool. The application compensates for latent heat generated by dehumidification of the evaporator through heating on the air inlet side and secondary cooling on the air outlet side, and realizes cooling and non-dehumidification by combining an energy recovery mechanism and system control optimization.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioner and its control method. Background Technology

[0002] As people's living standards improve, their demands for the comfort of air conditioning products are increasing. Traditional air conditioning systems, while achieving cooling, usually also have a strong dehumidifying effect. This is because during the cooling process, the surface temperature of the evaporator is lower than the dew point temperature of the air, causing water vapor in the air to condense and thus reduce indoor humidity.

[0003] However, excessive dehumidification can make indoor air too dry, easily causing problems such as dry skin and respiratory discomfort, especially in environments where air conditioning is used for extended periods, severely impacting the user's thermal comfort experience. Although some existing technologies have attempted to improve comfort through humidification devices or adjusting airflow modes, these solutions are often complex in structure, expensive, and fail to fundamentally resolve the contradiction between "cooling down and dehumidifying."

[0004] Therefore, there is a need for an air conditioner and its control method that can reduce unnecessary dehumidification during the cooling process, improve overall comfort, and overcome the aforementioned problems in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide an air conditioner and its control method, which compensates for the latent heat generated by the evaporator dehumidification by heating the air inlet side and cools the air outlet side twice. Combined with an energy recovery mechanism and optimized system control method, it achieves cooling without dehumidification.

[0006] To achieve the above objectives, the present invention provides an air conditioner and its control method. The technical solution of the present invention is implemented as follows:

[0007] An air conditioner includes an indoor unit and an outdoor unit. The indoor unit is equipped with a fan system and an evaporator. A first temperature control device is provided on the air inlet side of the evaporator, and a second temperature control device is provided on the air outlet side. When operating in a cooling-only mode, the first temperature control device is configured to heat and the second temperature control device is configured to cool.

[0008] Furthermore, both the first and second temperature control devices are semiconductor thermoelectric modules, and they are connected in series, so that the first temperature control device is at the heating end and the second temperature control device is at the cooling end, realizing the internal recovery and utilization of thermoelectric energy.

[0009] Furthermore, the airflow path is as follows: air inlet → first temperature control device → evaporator → second temperature control device → air outlet.

[0010] An air conditioner control method is provided for the above-mentioned cooling but non-dehumidifying air conditioner, wherein the heat output by the first temperature control device is equal to or slightly greater than the latent heat released by the cooling of water in the air at the evaporator, so as to maintain the relative humidity of the indoor air basically unchanged.

[0011] Furthermore, with the target inner tube temperature T 目标内管 As a core control parameter, T 目标内管 =max(T) dew T 中和潜热的内管温 ), where T dew T is the air dew point temperature calculated based on indoor temperature and humidity. 中和潜热的内管温 The lower limit of the evaporator surface temperature required to achieve complete humidity compensation.

[0012] Furthermore, T 中和潜热的内管温 =T 内环 -nP / Q 风量 , among which, T 内环 Where is the indoor ambient temperature, n is the equivalent cooling coefficient of the unit heating capacity to the inner pipe temperature, P is the heating power of the device, and Q is the actual operating air volume of the air conditioner.

[0013] Furthermore, when the actual inner tube temperature is detected to be lower than T... 目标内管 If the relative humidity at the air outlet is greater than 90%, increase the heating power of the first temperature control device to prevent the air supply from carrying mist.

[0014] Furthermore, when the indoor humidity is below the set threshold and the user selects the cooling mode, the cooling-without-dehumidifying mode is activated, and the first temperature control device is activated to neutralize and control the humidity.

[0015] Furthermore, the compressor frequency adopts a two-stage control mechanism: it is adjusted according to fixed rules during the initial startup, and then optimized based on the feedback of the inner tube temperature after entering a steady state.

[0016] Furthermore, the opening degree of the electronic expansion valve is controlled in stages based on the feedback of the inner tube temperature, thereby optimizing the refrigeration efficiency while ensuring stable evaporation pressure.

[0017] Furthermore, the internal fan speed is adjusted in stages based on the temperature feedback of the internal pipe, taking into account both air supply comfort and heat exchange efficiency.

[0018] Compared with the prior art, the air conditioner and its control method described in this invention have the following advantages:

[0019] 1. Truly achieves "cooling without dehumidifying". By introducing controllable heating on the air inlet side of the evaporator, the latent heat loss during the dehumidification process is precisely neutralized, solving the technical bottleneck of traditional air conditioners that require dehumidification for cooling.

[0020] 2. Improves human comfort. Avoids problems such as dry skin and respiratory discomfort caused by excessive dehumidification, making it especially suitable for long-term office work and sleeping scenarios.

[0021] 3. Supports energy recovery design. When using semiconductor technology, the first and second temperature control devices can share the same thermoelectric system, realizing closed-loop energy management of "cooling from one place and releasing heat from another," achieving energy savings of 15-30% compared to independent electric heating + conventional refrigeration solutions.

[0022] 4. Flexible structure and strong adaptability. Both the first and second temperature control devices can be selected from electric auxiliary heating or semiconductor forms according to the needs of the model. There can be one or more of them, supporting modular expansion, and they are suitable for various air conditioning products such as wall-mounted, cabinet, and embedded types.

[0023] 5. Compatible with intelligent control systems. It can be combined with the aforementioned compressor frequency, electronic expansion valve, and fan linkage strategy to achieve coordinated and optimized operation of the entire system, further improving stability and energy efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the air conditioner that cools but does not dehumidify as described in Embodiment 1 of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. First temperature control device; 2. Second temperature control device; 3. Evaporator; 4. Fan system. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only some, not all, of the embodiments of this invention. The specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] Example 1

[0029] This embodiment provides an air conditioner with cooling without dehumidification, which is particularly suitable for application scenarios that maintain a relatively constant air humidity while lowering the indoor temperature, such as humidity-sensitive medical environments, data centers, archives, or high-comfort residential spaces. Its core lies in compensating for the latent heat generated by the evaporator 3 during dehumidification through heating on the air inlet side, combined with a secondary cooling and energy recovery mechanism on the air outlet side, to achieve cooling without dehumidification.

[0030] An air conditioner consists of an indoor unit and an outdoor unit. The indoor unit contains a fan system 4 and an evaporator 3. The fan system 4, including a centrifugal or axial fan, drives air flow within the indoor unit, drawing in indoor air and returning it to the room through heat exchange components. The evaporator 3 is the main heat exchange component in the refrigeration cycle, cooling the air by absorbing heat with the refrigerant. During normal operation, as air passes through the evaporator 3, it is not only cooled but also releases moisture due to its temperature being below the dew point, resulting in significant dehumidification.

[0031] A first temperature control device 1 is installed on the air inlet side of the evaporator 3, and a second temperature control device 2 is installed on the air outlet side. For example... Figure 1 As shown, the arrows indicate the airflow direction. When operating in cooling-only mode, the first temperature control device 1 is configured for heating, and the second temperature control device 2 is configured for cooling. The first temperature control device 1 operates as a heating unit, and its heat output is equal to the latent heat generated by the air cooling and dehumidification process during the evaporator 3 cooling process, in order to compensate for the decrease in humidity; the second temperature control device 2 performs secondary cooling on the airflow after it has been cooled by the evaporator 3.

[0032] The first temperature control device 1 is located on the air inlet side of the evaporator 3, that is, before the airflow enters the evaporator 3. The first temperature control device 1 can be an electric auxiliary heating module, a semiconductor thermoelectric module or other heating device. Its function is to work as a heating unit in the cooling-without-dehumidifying mode, releasing heat to the air entering the evaporator 3 to offset the latent heat loss caused by the precipitation of condensate during the cooling process of the evaporator 3.

[0033] The second temperature control device 2 is located on the air outlet side of the evaporator 3, that is, at the position after the airflow leaves the evaporator 3 and before entering the room. The second temperature control device 2 can be a semiconductor cooling terminal, an independent semiconductor module, or other cooling device. In this embodiment, its main function is to perform secondary cooling on the already cooled air, further enhancing the cooling capacity.

[0034] The first temperature control device 1 and the second temperature control device 2 can each be configured with one or more units, which can be combined to achieve the effect of heating or cooling.

[0035] When both the first temperature control device 1 and the second temperature control device 2 are semiconductor thermoelectric modules, and their electrical connection is in reverse series, the first temperature control device 1 is in the heating end and the second temperature control device 2 is in the cooling end, thus enabling the internal recovery and utilization of thermoelectric energy.

[0036] In one scenario, the first temperature control device 1 and the second temperature control device 2 are two independent semiconductor modules, which respectively perform heating and cooling.

[0037] In another scenario, the semiconductor thermoelectric module is integrated into the same thermal management system. The heating capacity of the first temperature control device 1 originates from the cooling process at the cold end of the second temperature control device 2, forming a local thermoelectric cycle. That is, a two-stage structure using a single semiconductor is employed, with the hot end and cold end arranged on both sides of the evaporator 3, respectively. The first temperature control device 1 is the heating end, and the second temperature control device 2 is the cooling end, forming a local closed-loop thermoelectric cycle.

[0038] After the air conditioner is turned on, airflow is drawn in from the fan system 4 and passes through the following path in sequence: air inlet → first temperature control device 1 → evaporator 3 → second temperature control device 2 → air outlet. With this airflow path design, the air conditioner can operate normally in the normal mode and achieve the function of cooling without dehumidifying in the cooling-without-dehumidifying mode.

[0039] After the cooling-without-dehumidifying mode is activated, the first temperature control device 1 is in working condition to neutralize the latent heat.

[0040] The first temperature control device 1 switches to heating mode, and its output heat is controlled to be equal to or slightly greater than the latent heat released by the evaporator 3 due to air cooling under the current operating conditions. In this way, although the air entering the evaporator 3 is cooled, it does not condense due to preheating, and the humidity hardly changes, thus achieving the effect of cooling without dehumidifying.

[0041] The second temperature control device 2 is used for secondary cooling and energy recovery. After being cooled by the evaporator 3, the air still retains some residual heat; the second temperature control device 2 plays a dual role in this stage:

[0042] If the second temperature control device 2 is a separate semiconductor cooling terminal or other cooling device, it will further cool the cold air, improve the cooling efficiency, and achieve the user's cooling goal.

[0043] If the first temperature control device 1 and the second temperature control device 2 are composed of the same thermoelectric system, that is, the two ends of a semiconductor module are respectively placed on the air inlet side and the air outlet side, then an energy recovery type thermoelectric cycle can be realized:

[0044] The first temperature control device 1, acting as the hot end (heating end), releases heat to the incoming air; the second temperature control device 2, acting as the cold end (cooling end), continues to cool the outgoing air; the semiconductor achieves directional heat transfer through the Peltier effect, completing the "heating and cooling simultaneously" functional allocation without additional energy consumption. With this configuration, the system's overall energy efficiency is significantly improved, and some of the energy originally lost as waste heat is reused to enhance the cooling effect, achieving thermal energy reuse and functional decoupling control.

[0045] By actively heating the air before evaporator 3, net dehumidification does not occur even when the temperature drops below the dew point during subsequent cooling. The key is to ensure that the heating amount is equal to or slightly greater than the latent heat generated by moisture desorption, thereby achieving humidity balance.

[0046] The secondary cooling process utilizes a second temperature control device 2 to further cool the air that has already undergone primary cooling, compensating for the overall decrease in cooling capacity caused by front-end heating and ensuring that the room temperature can still be effectively reduced.

[0047] Taking a hot and humid summer environment as an example:

[0048] Initial indoor conditions: T=30°C, RH=65%, moisture content ω≈15g / kg.

[0049] User-defined target temperature: T set =24°C, turn on cooling mode without dehumidification.

[0050] After the system is started, the first temperature control device 1 (electric heating or semiconductor hot end) starts to work, inputting heat of approximately latent heat into the air entering the evaporator 3.

[0051] Evaporator 3 is cooling normally, and the air temperature drops from 30°C to 18°C, which theoretically would cause moisture to be released. However, since the incoming air has been preheated, the dew point of the air actually entering evaporator 3 is raised, making the final moisture content of the outlet air close to that of the incoming air.

[0052] The air outlet is cooled again to about 16°C by the second temperature control device 2 before being sent into the room.

[0053] The final result was that the indoor temperature dropped to 24°C, the relative humidity remained in the range of 60-65%, and there was no obvious feeling of dryness.

[0054] The core idea of ​​latent heat neutralization is to moderately heat the air with sensible heat before evaporator 3, changing its thermodynamic path so that even after subsequent cooling and a drop in temperature below the original dew point, no significant condensation process will be triggered. This achieves cooling without causing net dehumidification, avoiding the cyclical operation of "dehumidifying first, then heating" in traditional processes. By eliminating unnecessary reheating, the overall energy consumption of the system is reduced, while also maintaining the set humidity level more precisely.

[0055] Therefore, "latent heat neutralization" is essentially a technical means of independently controlling temperature and humidity. It utilizes sensible heat regulation to actively intervene in the air handling path, causing the cooling process to bypass the effective dehumidification zone, thereby achieving the goal of adjustable temperature while maintaining essentially constant humidity. This method not only improves the operating efficiency of the air conditioning system but also enhances the control precision of environmental parameters. It is particularly suitable for humidity-sensitive and energy-efficient locations, such as cleanrooms, data centers, and cultural relic preservation spaces. Ultimately, it represents a shift from "passive coupled processing" to "active decoupled control," a significant step towards intelligent and low-carbon modern high-efficiency air conditioning systems.

[0056] Meanwhile, the energy recovery semiconductor structure uses a single or dual semiconductor module to form a closed thermoelectric circuit, with one end supplying heat to the air inlet side to neutralize latent heat, and the other end absorbing heat to the air outlet side to enhance cooling, thereby realizing energy cascade utilization and reducing total energy consumption.

[0057] The airflow sequence control stipulates that the airflow must first pass through the first temperature control device 1 (heating), then through the evaporator 3 (cooling and dehumidifying), and finally through the second temperature control device 2 (re-cooling). This ensures that heat compensation occurs before dehumidification, and the logical sequence is irreversible, which is a prerequisite for achieving "no dehumidification".

[0058] In summary, this embodiment, through the reasonable arrangement of the first temperature control device 1 and the second temperature control device 2, and based on a specific airflow path and thermodynamic control logic, successfully constructs a new air conditioning operation mode that can both efficiently cool down and maintain stable humidity, which has practicality and industrialization prospects.

[0059] Example 2

[0060] This embodiment provides a control method for an air conditioner to achieve the technical goal of reducing indoor temperature without significantly changing the relative humidity of the air. Its core idea is to maintain stable indoor humidity by using evaporator 3 for cooling and by compensating for latent heat on the air intake side, thereby removing sensible heat while mitigating latent heat loss due to humidity.

[0061] To ensure stable system operation, prevent condensation at the outlet air, and improve energy efficiency and comfort, this embodiment proposes a set of methods based on the target inner pipe temperature T. 目标内管 The system employs a triple-coordinated control strategy that integrates compressor frequency, electronic expansion valve opening, and internal fan speed.

[0062] T 目标内管 The target inner tube temperature of the evaporator 3 was determined by comprehensively considering the requirements for preventing condensation and neutralizing humidity. 目标内管 =max(T) dew T 中和潜热的内管温 ), where T dew The air dew point temperature calculated based on indoor temperature and humidity is used for anti-condensation control; T 中和潜热的内管温 The lower limit of the evaporator surface temperature required to achieve complete humidity compensation, i.e., the target inner tube temperature T. 目标内管 Two conditions must be met simultaneously: first, the temperature must be above the dew point to avoid moisture loss or fogging in the air supply; second, the minimum cooling intensity required for latent heat compensation must be met.

[0063] Specifically, T 中和潜热的内管温 =T 内环 -n*P / Q 风量 T 内环For real-time monitoring of indoor temperature, 'n' represents the equivalent cooling coefficient of a unit of heating capacity on the inner pipe temperature, 'P' represents the heating power of the device, and 'Q' represents the actual operating airflow of the air conditioner. 'n' expresses the ratio of latent heat to sensible heat, and its physical meaning is the sensible heat reduction (°C·s·m) that can be offset by each unit of electric heating power (W) at a given airflow (m³ / s). -3 ·W -1 This reflects the sensitivity of the heating compensation to the thermal balance adjustment of the evaporator tube wall temperature.

[0064] The compressor frequency employs a two-stage control mechanism. During initial startup, it adjusts according to a fixed rule; once steady state is achieved, it switches to a frequency based on T. 内管 and T 目标内管 The core parameter is optimized for control. This control method combines the principles of coordinated temperature and humidity regulation with energy compensation, maintaining indoor humidity while ensuring comfortable cooling, thus improving energy efficiency and user experience.

[0065] Initial frequency control is based on ΔT=T 内环 -T 设定 , among which, T 内环 For real-time monitoring of indoor environmental temperature (°C), T 设定 The target cooling temperature (°C) is set by the user. The conditional control action is:

[0066] If ΔT≥0, the frequency is increased at a rate of 2Hz / 3min until the upper limit frequency for dehumidification is reached;

[0067] When 1.5℃≤ΔT<0, the frequency optimization control stage begins.

[0068] When the temperature is -2.5℃≤ΔT<-1.5℃, the frequency decreases at a rate of 2Hz / 3min until the lower limit frequency is reached;

[0069] When ΔT < -2.5℃, the frequency drops rapidly at a rate of 4Hz / 3min until it reaches the lower limit frequency.

[0070] The upper limit frequency for dehumidification refers to the maximum allowable operating frequency of the compressor in dehumidification priority mode; the lower limit frequency is the minimum frequency at which stable cooling can be maintained (e.g., 30Hz).

[0071] During initial startup, prioritize operation at the target dehumidification frequency to ensure rapid entry into effective cooling mode.

[0072] Frequency optimization control based on T 内管 With T 目标内管 Deviation setting: Once the optimization phase begins, the system dynamically compares the actual inner tube temperature with the target inner tube temperature for fine-tuning. Among these, T... 内管 The actual surface temperature of evaporator 3 (which can be measured by a pipe temperature sensor) is used for conditional control actions as follows:

[0073] T 内管 -T 目标内管 At ≥1℃, the frequency is increased to 2Hz / 3min to enhance cooling capacity;

[0074] 0≤T 内管 -T 目标内管 <1℃, maintain the current frequency and keep the system running in a steady state;

[0075] -2≤T 内管 -T 目标内管 For temperatures below 0℃, reduce the frequency by 2Hz / 3min to prevent overcooling.

[0076] T 内管 -T 目标内管 At ≤-2℃, the frequency is rapidly reduced to 4Hz / 3min to avoid the risk of condensation.

[0077] The frequency optimization control logic enables the transition from coarse adjustment to fine control, which can quickly respond to load changes and prevent frequent start-stop and overcooling.

[0078] Electronic expansion valve according to T 内管 With T 目标内管 The refrigerant flow rate is dynamically adjusted based on the deviation to ensure stable evaporation pressure and optimal heat exchange efficiency. The conditional control action is as follows:

[0079] T 内管 -T 目标内管 At ≥2℃, the expansion valve is normally PID regulated, and the opening degree is increased or decreased as needed;

[0080] 1≤T 内管 -T 目标内管 At temperatures below 2℃, do not further reduce the opening to prevent insufficient liquid supply.

[0081] 0≤T 内管 -T 目标内管 If the temperature is below 1℃, maintain the current opening and keep the balance.

[0082] T 内管 -T 目标内管 At 0°C, 5 pulses (P) are added every 3 minutes to accelerate refrigerant supply and increase evaporation temperature.

[0083] By coordinating with the compressor frequency, precise temperature control of the evaporator 3 is achieved; surface condensation is prevented; and the cooling effect is ensured while maintaining stable indoor humidity.

[0084] This strategy effectively prevents excessive dehumidification or frosting caused by excessively low evaporation temperatures, providing significant protection, especially under conditions close to the dew point. This strategy is a key throttling control element in air conditioners that cool without dehumidifying, embodying the principles of temperature and humidity decoupling and feedback compensation.

[0085] The internal fan speed is dynamically adjusted based on the overall system status, balancing airflow comfort and heat exchange efficiency. The conditional control actions are as follows:

[0086] T 内管 -T 目标内管 At ≥2℃, the internal fan operates in "automatic fan" mode, adaptively adjusting according to the temperature difference;

[0087] 0≤T 内管 -T 目标内管 At temperatures below 2°C, maintain the current rotational speed to avoid disrupting system stability.

[0088] T 内管 -T 目标内管 When the temperature is below 0℃, the system will force a switch to high-speed operation to accelerate the release of cold energy and reduce the risk of condensation buildup in the evaporator.

[0089] High airflow helps to increase air circulation rate, shorten the low-temperature residence time, and further reduce the possibility of condensation. When the temperature of evaporator 3 is much higher than the target, the airflow is increased to speed up cooling; when approaching the target temperature, the airflow is kept stable to prevent humidity fluctuations; when the temperature is too low, a high airflow is forced to avoid condensation on the outlet side, while also enhancing heat exchange efficiency.

[0090] Through the coordinated execution of the above three control strategies, this embodiment achieves the following key technical effects:

[0091] Truly achieves cooling without dehumidification: The first temperature control device 1 (heating on the air inlet side) accurately compensates for the latent heat generated by the evaporator 3 during dehumidification, keeping the indoor air humidity content basically unchanged and only reducing the dry bulb temperature, significantly improving human thermal comfort. It is especially suitable for dry seasons or spaces that are sensitive to humidity (such as data centers, laboratories, archives, etc.).

[0092] To prevent condensation and fogging in the air supply: The "target inner tube temperature" is introduced as a unified control benchmark. Combined with the dual constraints of dew point temperature and neutralization requirements, the hidden danger of condensation caused by low-temperature air supply is fundamentally avoided.

[0093] The system operates more stably and efficiently: the compressor frequency adopts segmented optimization control to avoid frequent fluctuations; the electronic expansion valve and the fan work together to improve the overall energy efficiency ratio and dynamic response accuracy.

[0094] High level of intelligence: The entire control algorithm can be automatically executed by the central controller, supporting real-time calculation and dynamic optimization of operating parameters based on indoor temperature and humidity, without the need for manual intervention.

[0095] High compatibility: This control method is applicable to various split and multi-split air conditioning systems equipped with electric auxiliary heating or semiconductor thermoelectric modules, and has good prospects for engineering applications.

[0096] In addition, when the actual inner tube temperature is detected to be lower than T目标内管 When the relative humidity at the air outlet is greater than 90%, the heating power of the first temperature control device 1 will be automatically increased to prevent the air supply from carrying mist.

[0097] When the indoor humidity is below the set threshold and the user selects the cooling mode, the cooling-without-dehumidifying mode is automatically activated, and the first temperature control device 1 is activated to neutralize and control the humidity.

[0098] In summary, this invention achieves precise decoupling control of cooling and humidity maintenance by constructing a closed-loop control system with "target inner tube temperature" as the core, thus solving the technical problem that traditional air conditioners inevitably dehumidify during the cooling process.

[0099] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An air conditioner, comprising an indoor unit and an outdoor unit, wherein the indoor unit is provided with a fan system (4) and an evaporator (3), characterized in that, The evaporator (3) is provided with a first temperature control device (1) on the air inlet side and a second temperature control device (2) on the air outlet side; when the cooling and non-dehumidification mode is running, the first temperature control device (1) is configured to heat and the second temperature control device (2) is configured to cool.

2. The air conditioner according to claim 1, characterized in that, The first temperature control device (1) and the second temperature control device (2) are both semiconductor thermoelectric modules, and they are connected in series, so that the first temperature control device (1) is at the heating end and the second temperature control device (2) is at the cooling end, realizing the internal recovery and utilization of thermoelectric energy.

3. The air conditioner according to claim 1 or 2, characterized in that, The air flow path is as follows: air inlet → first temperature control device (1) → evaporator (3) → second temperature control device (2) → air outlet.

4. An air conditioner control method, characterized in that, The control method is used in any one of the cooling but not dehumidifying air conditioners according to claims 1 to 3, controlling the heat output by the first temperature control device (1) to be equal to or slightly greater than the latent heat released by the cooling of water in the air at the evaporator (3), so as to maintain the relative humidity of the indoor air basically unchanged.

5. The control method according to claim 4, characterized in that, With target inner tube temperature T 目标内管 As a core control parameter, T 目标内管 =max(T) dew T 中和潜热的内管温 ), where T dew T is the air dew point temperature calculated based on indoor temperature and humidity. 中和潜热的内管温 The lower limit of the evaporator surface temperature required to achieve complete humidity compensation.

6. The control method according to claim 5, characterized in that, T 中和潜热的内管温 =T 内环 -nP / Q 风量 , among which, T 内环 Where is the indoor ambient temperature, n is the equivalent cooling coefficient of the unit heating capacity to the inner pipe temperature, P is the heating power of the device, and Q is the actual operating air volume of the air conditioner.

7. The control method according to claim 5, characterized in that, When the actual inner tube temperature is detected to be lower than T 目标内管 When the relative humidity at the air outlet is greater than 90%, increase the heating power of the first temperature control device (1) to prevent the air supply from carrying mist.

8. The control method according to claim 4, characterized in that, When the indoor humidity is lower than the set threshold and the user selects the cooling mode, the cooling-without-dehumidification mode is activated, and the first temperature control device (1) is activated to perform humidity neutralization control.

9. The control method according to claim 4, characterized in that, The compressor frequency adopts a two-stage control mechanism: it is adjusted according to a fixed rule during the initial startup, and then optimized based on the feedback of the inner tube temperature after entering a steady state.

10. The control method according to claim 4, characterized in that, The opening degree of the electronic expansion valve is controlled in stages based on the feedback of the inner tube temperature, thereby optimizing the refrigeration efficiency while ensuring stable evaporation pressure.

11. The control method according to claim 4, characterized in that, The internal fan speed is adjusted in stages based on the temperature feedback of the internal pipe, taking into account both air supply comfort and heat exchange efficiency.

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