Wall-mounted air conditioner efficient heat supply method capable of alternately switching high-temperature hot air supply and low-temperature hot air supply

Abstract

A wall-mounted air conditioner efficient heat supply method capable of alternately switching high-temperature hot supply air and low-temperature hot supply air comprises the steps that high-temperature hot supply air generated by air conditioner heating is alternately used for providing heat for a room, and low-temperature hot supply air is used for transferring heat accumulated in the upper space of the room due to thermal buoyancy to the lower space of the room where a personnel activity area is located; heat of the upper space of the room is recycled to create a thermal environment of the lower space of the room, and energy consumption of an air conditioner is reduced; according to the method, the temperature difference between the head and the feet can be reduced, the thermal comfort is improved, and experimental data shows that the energy efficiency of the air conditioner can be improved by 22.6%, and the temperature difference between the head and the feet of the sitting posture and the standing posture is reduced by 39.0% and 45.3% respectively.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning and heating, and in particular relates to a high-efficiency heating method for a wall-mounted air conditioner with alternating switching between high-temperature and low-temperature hot air supply. Background Art

[0002] Winter heating is an inevitable requirement for creating a thermally comfortable environment. However, winter heating consumes a lot of energy and is the focus of energy conservation and emission reduction in the construction field. On-demand heating is a major technical path for high-efficiency heating.

[0003] There are two main heating methods: radiation and convection. Radiant heating creates a uniform thermal environment with high comfort, but its thermal response is slow and is not suitable for heating on demand. Convection heating has a fast thermal response and is suitable for heating on demand. Air conditioning is the most common form of convection heating and is widely used in residential and office buildings.

[0004] However, the heat waste and thermal discomfort caused by the heat buoyancy of air-conditioning convection heating need to be solved urgently. Because the hot air supply of convection heating is affected by the heat buoyancy, the hot air supply floats to the upper space of the room, causing the heat of the supply air to accumulate in the upper space of the room. The heat accumulated in the upper space of the room cannot be used to create a thermal environment in the work area, resulting in a waste of hot air supply energy and low thermal efficiency in creating a thermal environment in the work area. At the same time, the heat accumulated in the upper space of the room causes thermal stratification in the room, resulting in thermal discomfort caused by a large temperature difference between the head and feet.

[0005] Wall-mounted air conditioners are one of the most commonly used air conditioners. They are usually installed on the upper part of the wall, and their hot air outlet is in the upper space of the room. This means that the heat accumulation in the upper space of the room causes the temperature difference between the head and feet, causing thermal discomfort and high energy consumption, which is particularly serious and needs to be solved urgently. Summary of the invention

[0006] In order to overcome the above-mentioned problems of the prior art, the purpose of the present invention is to provide an efficient heating method for a wall-mounted air conditioner with alternating switching between high-temperature and low-temperature hot air supply, alternately using the high-temperature hot air supply generated by the air conditioner to provide heat to the room, and using the low-temperature hot air supply to transfer the heat accumulated in the upper space of the room due to thermal buoyancy to the lower space of the room where the personnel activity area is located, thereby realizing the reuse of heat in the upper space of the room to create a thermal environment in the lower space of the room, reducing the energy consumption of the air conditioner; at the same time, reducing the temperature difference between the head and the feet, and improving thermal comfort.

[0007] In order to achieve the above object, the technical solution of the present invention is:

[0008] The invention discloses an efficient heating method for a wall-mounted air conditioner with alternating switching between high-temperature and low-temperature hot air supply. The high-temperature hot air supply mode and the low-temperature hot air supply mode of the wall-mounted air conditioner are alternately switched. The high-temperature hot air supply mode is generated by air conditioning heating to heat the room. The low-temperature hot air supply mode does not require air conditioning heating. The low-temperature hot air supply mode reuses the hot air accumulated in the upper space of the room due to the thermal buoyancy of the hot air to create the lower space of the room where the personnel activity area is located, thereby reducing the thermal discomfort caused by the temperature difference between the head and the feet and improving the heating efficiency of the air conditioner.

[0009] In the high-temperature hot air supply mode, the air inlet of the air conditioner draws air from the upper space of the room into the interior of the air conditioner; the air entering the interior of the air conditioner is heated by the air conditioner, and then blown from the air conditioner outlet to the lower part of the room where the personnel activity area is located. The air supply angle and speed of the high-temperature hot air supply are determined according to the thermal comfort standard or the thermal preference of the personnel.

[0010] In the low-temperature hot air supply mode, the air inlet of the air conditioner draws air from the upper space of the room into the interior of the air conditioner; the air entering the interior of the air conditioner is the hot air that is gathered in the upper space of the room due to thermal buoyancy and heated by the air conditioner in the high-temperature hot air supply mode. In the low-temperature air supply mode, it does not need to be heated by the air conditioner, and is blown from the air conditioner outlet to the lower space of the room where the personnel activity area is located. Due to the negative pressure area caused by the air inlet of the wall-mounted air conditioner, the hot air in the upper space of the room is efficiently sucked into the wall-mounted air conditioner by using the ceiling attachment effect.

[0011] The air supply angle of the low-temperature hot air supply mode is downward, so that the low-temperature hot air supply can flow downward along the wall by utilizing the wall adhesion effect, and utilize the wall adhesion effect to deliver the hot air in the upper space of the room to the lower space of the room where the personnel activity area is located.

[0012] The air supply angle of the low-temperature air supply mode is adjusted by the air supply outlet baffle of the wall-mounted air conditioner, by the air conditioner's external guide plate, or by other methods with similar functions.

[0013] The low-temperature hot air flows toward the lower part of the room by adhering to the wall surface, while sucking in the indoor air along the way. Its suction force is particularly strong in the upper space of the room, and more hot air from the upper space of the room is sent to the lower space of the room where the personnel activity area is located. Since the low-temperature hot air transfers the hot air from the upper space of the room to the lower space of the room where the personnel activity area is located, the temperature difference between the head and feet is reduced, and the thermal discomfort problem caused by the excessive temperature difference between the head and feet is alleviated; at the same time, the low-temperature hot air will gather the hot air generated by the air-conditioning heating mode in the upper space of the space due to thermal buoyancy and reuse it to create the lower space of the room where the personnel activity area is located, thereby improving the utilization efficiency of the hot air generated by the air-conditioning heating mode.

[0014] The greater the air supply speed of the low-temperature hot air supply mode, the more hot air in the upper space of the room will be delivered to the lower space of the room where the personnel activity area is located, but the air speed in the personnel activity area will increase; the maximum air supply speed of the low-temperature hot air supply mode is determined based on the limit value of the air speed in the personnel activity area caused by the low-temperature hot air supply mode, and the limit value of the air speed in the personnel activity area is determined based on the thermal comfort standard or the thermal preference of the personnel.

[0015] The longer the low-temperature hot air supply mode works relative to the high-temperature hot air supply mode, the higher the air conditioning energy efficiency is. However, since the heat transferred from the upper space of the room is not enough to offset the cold entering the personnel activity area from the outside, the temperature of the personnel activity area decreases. The working time of the low-temperature hot air supply mode relative to the high-temperature hot air supply mode is determined by the limit value of the air temperature in the personnel activity area, and the limit value of the air temperature in the personnel activity area is determined based on the thermal comfort standard or the thermal preference of the personnel.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) The present invention innovatively proposes a wall-mounted low-temperature hot air supply mode, using the wall-mounted air conditioner as a heat transfer device to transfer the hot air that is heated by the air conditioner in the high-temperature hot air supply mode and is gathered in the upper space of the room due to thermal buoyancy to the lower space of the room where the personnel activity area is located, thereby alleviating the thermal discomfort caused by the large temperature difference between the head and feet and improving the utilization efficiency of the hot air generated in the air conditioning heating mode. The three main principles of the strong heat transfer ability of the wall-mounted air conditioner in the low-temperature hot air supply mode are: first, the negative pressure area at the inlet of the wall-mounted air conditioner uses the attachment effect of the top (ceiling) of the room to increase its ability to draw hot air from the upper space of the room. Second, the attachment effect of the side wall surface is used to make the low-temperature hot air at the outlet of the wall-mounted air conditioner be directed to the lower space of the room where the personnel activity area is located, preventing the low-temperature hot air from rising back to the upper space of the room due to thermal buoyancy before reaching the lower space of the room where the personnel activity area is located. Third, the suction force of the hot air at the outlet of the wall-mounted air conditioner carries more hot air from the upper space of the room into the lower space of the room where the personnel activity area is located.

[0018] (2) The present invention utilizes the alternating switching between the high-temperature hot air supply mode and the low-temperature hot air supply mode, so that the wall-mounted air conditioner conveniently integrates two major functions: (1) air conditioning heating; and (2) heat transfer from the upper space of the room to the bottom space of the room where the personnel activity area is located.

[0019] (3) The heat transfer function of the low-temperature hot air supply mode not only increases the heat utilization efficiency of the wall-mounted air conditioner, but also eliminates the need for heating in the low-temperature hot air supply mode, greatly reducing the heating time of the wall-mounted air conditioner and further reducing the heating energy consumption of the wall-mounted air conditioner.

[0020] In summary, the present invention realizes the reuse of heat in the upper space of the room by alternately using high-temperature hot supply air generated by air conditioning heating to provide heat to the room, and using low-temperature hot supply air to transfer heat accumulated in the upper space of the room to the lower space of the room where the personnel activity area is located, so as to create a thermal environment in the lower space of the room, thereby reducing the energy consumption of the air conditioner; at the same time, this method can also reduce the temperature difference between the head and the feet, and improve thermal comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a real scene diagram of an embodiment of the present invention.

[0022] Figure 2 This is a plan view of an embodiment of the present invention.

[0023] Figure 3 Graph showing the measured inlet / outlet air temperature and air velocity of the air conditioner according to an embodiment of the present invention.

[0024] Figure 4 is a graph of air temperature and air velocity of the L1 measurement line according to an embodiment of the present invention, wherein Figure 4 (a) is the temperature diagram. Figure 4 (b) in the figure is the velocity diagram.

[0025] Figure 5 is a graph of air temperature and air velocity of the L2 measurement line according to an embodiment of the present invention, wherein Figure 5 (a) is the temperature diagram. Figure 5 (b) in the figure is the velocity diagram.

[0026] Figure 6 is a graph of air temperature and air velocity of the L3 measurement line according to an embodiment of the present invention, wherein Figure 6 (a) is the temperature diagram. Figure 6 (b) in the figure is the velocity diagram.

[0027] Figure 7 is a graph of air temperature and air velocity for the L4 measurement line according to an embodiment of the present invention, wherein Figure 7 (a) is the temperature diagram. Figure 7 (b) in the figure is the velocity diagram.

[0028] Figure 8 This is a diagram of the air temperature difference on the L1-L4 measurement line according to an embodiment of the present invention.

[0029] Fig. 9 FIG. 4 is a power consumption diagram of the embodiment of the invention and the prior art method. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] The present invention provides an efficient heating method for a wall-mounted air conditioner with alternating switching between high-temperature and low-temperature hot air supply. The method alternately utilizes the high-temperature hot air supply generated by the air conditioner to provide heat to the room, and utilizes the low-temperature hot air supply to transfer the heat accumulated in the upper space of the room due to thermal buoyancy to the lower space of the room where personnel are active, thereby realizing the reuse of the heat in the upper space of the room to create a thermal environment in the lower space of the room and reducing the energy consumption of the air conditioner. The method can also reduce the temperature difference between the head and the feet and improve thermal comfort.

[0032] Example

[0033] The specific implementation scenario of the present invention is as follows Figure 1 and 2 The figure shows a living room scene arranged in a laboratory environment chamber. During the actual measurement, only the wall-mounted air conditioner in the figure was used, and the cabinet air conditioner in the figure was not used, that is, the wall-mounted air conditioner was used in this embodiment. The existing method uses the hot air supply of the wall-mounted air conditioner to provide heat to the room, that is, the wall-mounted air conditioner is only in the heating mode.

[0034] The present invention alternately utilizes high-temperature hot air generated by the wall-mounted air conditioner to provide heat to the room, and utilizes low-temperature hot air to transfer heat accumulated in the upper space of the room due to thermal buoyancy to the lower space of the room where the personnel activity area is located.

[0035] The wall-mounted air conditioner is installed in the upper space of the room. The top of the wall-mounted air conditioner is 250mm away from the ceiling. The ceiling is 2.8m away from the floor. The air inlet of the wall-mounted air conditioner is 670mm (length) × 180mm (width). The air inlet of the wall-mounted air conditioner is 250mm away from the ceiling. The air inlet of the wall-mounted air conditioner is a negative pressure area, which draws hot air from the upper space of the room, and uses the ceiling attachment effect of the air inlet airflow to increase the ability to draw hot air from the upper space of the room.

[0036] Specifically, the wall-mounted air conditioner is installed in the upper space of the room and on the side wall close to the wall surface. The air outlet size of the wall-mounted air conditioner is 780mm (length) × 100mm (width). The air outlet size is 120mm away from the side wall.

[0037] In the high-temperature hot air supply mode, the air inlet of the wall-mounted air conditioner draws air from the upper space of the room into the air conditioner; the air entering the wall-mounted air conditioner is heated by the wall-mounted air conditioner, and then blown from the wall-mounted air conditioner outlet to the lower part of the room where the personnel activity area is located. The air supply angle and speed of the high-temperature hot air supply are determined according to the thermal comfort standard or the thermal preference of the personnel. In this embodiment, according to the thermal preference of the experimenter, the wall-mounted air conditioner is set to 25°C, the air supply angle is set to 45° downward, and the air supply speed is the automatic wind option of the wall-mounted air conditioner.

[0038] In low-temperature hot air supply mode, the air inlet of the wall-mounted air conditioner draws air from the upper space of the room into the interior of the wall-mounted air conditioner. The air entering the interior of the wall-mounted air conditioner is the hot air that is heated by the wall-mounted air conditioner in the high-temperature hot air supply mode and is gathered in the upper space of the room due to thermal buoyancy. In the low-temperature air supply mode, it is not heated by the wall-mounted air conditioner and blows downward from the air conditioner outlet to the lower space of the room where the personnel activity area is located. Since the wall-mounted air conditioner is in the upper space of the room and close to the ceiling, the negative pressure area created by the air inlet of the wall-mounted air conditioner uses the ceiling attachment effect to efficiently draw the hot air in the upper space of the room into the wall-mounted air conditioner.

[0039] The wall-mounted air supply angle in the low-temperature hot air supply mode is downward, so that the low-temperature hot air supply can flow downward along the wall using the wall adhesion effect and be delivered to the lower space of the room where the personnel activity area is located. While the low-temperature hot air supply adheres to the wall surface and flows toward the lower part of the room, the low-temperature hot air supply jet sucks the indoor air along the way. Its suction force is particularly strong in the upper space of the room, and more hot air from the upper space of the room is delivered to the lower space of the room where the personnel activity area is located. Since the low-temperature hot air supply transfers the hot air from the upper space of the room to the lower space of the room where the personnel activity area is located, the temperature difference between the head and feet is reduced, and the thermal discomfort problem caused by the excessive temperature difference between the head and feet is alleviated. At the same time, the low-temperature hot air supply will gather the hot air generated by the air conditioning heating mode in the upper space of the space due to thermal buoyancy and use it again to create the lower space of the room where the personnel activity area is located, thereby improving the utilization efficiency of the hot air generated by the air conditioning heating mode.

[0040] The greater the air supply speed of the low-temperature hot air supply mode, the more hot air in the upper space of the room can be transferred to the lower space of the room where the personnel activity area is located, which is conducive to alleviating the thermal discomfort problem caused by the large temperature difference between the head and the feet, and increasing the utilization efficiency of the hot air generated by the air conditioning heating mode. However, increasing the air supply speed of the low-temperature hot air supply mode will cause the low-temperature hot air to collide with the ground and diffuse, which will cause the air speed in the personnel activity area to increase. The maximum value of the air supply speed of the low-temperature hot air supply mode is determined based on the limit value of the air speed in the personnel activity area, and the limit value of the air speed in the personnel activity area is determined based on the thermal comfort standard or the thermal preference of the personnel. In this embodiment, the limit value of the air speed in the personnel activity area is determined based on the thermal preference of the experimenter, that is, the maximum value of the air supply speed of the low-temperature hot air supply mode is determined by the thermal preference of the experimenter. The experimenter determined that the air supply speed of the low-temperature hot air supply mode is a high wind speed option for the wall-mounted air conditioner.

[0041] The longer the working time of the low-temperature hot air supply mode relative to the high-temperature hot air supply mode, the higher the air conditioning energy efficiency. However, due to the increase in the working time of the low-temperature hot air supply mode relative to the high-temperature hot air supply mode, the amount of heat supplied to the room by the air conditioner is reduced, and the cold entering the personnel activity area from the outside cannot be offset, and the temperature of the personnel activity area is reduced. The working time of the low-temperature hot air supply relative to the high-temperature hot air supply is determined by the limit value of the air temperature in the personnel activity area. The limit value of the air temperature in the personnel activity area is determined based on the thermal comfort standard or the thermal preference of the personnel. In this embodiment, the limit value of the air temperature in the personnel activity area is determined based on the thermal preference of the experimenter, that is, the working time of the low-temperature hot air supply mode relative to the high-temperature hot air supply mode is determined based on the thermal preference of the experimenter. The experimenter determined that the working time of the low-temperature hot air supply mode relative to the high-temperature hot air supply mode is 1:1, both of which are 15 minutes, which makes the average temperature of the personnel activity area not lower than the temperature setting value of the wall-mounted air conditioner.

[0042] The actual measurement of the inlet and outlet air temperatures and outlet air velocity of the air conditioner in this embodiment. Figure 2 ). Each measuring line measures the air temperature and velocity at four heights: 0.1m, 1.1m, 1.7m and 2.7m. The L1 and L3 measuring lines are located near and far areas of the air-conditioning supply jet, respectively. The L2 and L4 measuring lines are located near and far areas outside the air-conditioning supply jet, respectively.

[0043] The actual measurement of this embodiment lasted for 90 minutes. In the first 30 minutes of this embodiment, the existing method was used, that is, the wall-mounted air conditioner was in heating mode only. When the existing method was used, when the air conditioner was running stably, the thermal stratification temperature difference of the measurement line L1-L4 (i.e., the temperature difference at 2.7m and 0.1m) was between 4.5℃–5.4℃ (average 4.9℃) ( Figure 4 – Figure 8 ). This indicates that the existing method causes a large amount of heat to accumulate in the upper space of the room, resulting in heat waste. The power consumption of the existing method is 530W ( Fig. 9 ).

[0044] Under the existing method, the head-foot temperature difference in sitting position (i.e., the temperature difference at 1.1m and 0.1m) and the head-foot temperature difference in standing position (i.e., the temperature difference at 1.7m and 0.1m) of the measurement lines L1-L4 are between 2.5℃–8.0℃ (4.2℃ on average) and 3.8℃–5.1℃ (4.4℃ on average), respectively. Figure 4 – Figure 8 ), exceeding the upper limit of the head-to-foot temperature difference specified in the thermal comfort standard (i.e. 3°C), leading to thermal discomfort.

[0045] In this example, the method of the present invention was used for the last 60 minutes. Under the method of the present invention, the thermal stratification temperature difference (i.e., the temperature difference at 2.7m and 0.1m) was reduced to 3.1°C-3.8°C (average 3.6°C) ( Figure 4 – Figure 8 ), which shows that the present invention effectively transfers the heat from the upper space of the room to the lower space of the room where the personnel activity area is located, which is used to create a thermally comfortable environment in the personnel activity area, and reuses the heat that was originally wasted. Since the present invention can efficiently use heat to create a thermally comfortable environment, the present invention reduces the power consumption to 410W, and the energy saving rate is 22.6% (compared with the existing method Fig. 9 ).

[0046] Under the method of the present invention, the temperature of the personnel activity area (represented by the average temperature of the head and feet of the measurement lines L1-L4) is higher than the wall-mounted air conditioner set temperature of 25°C, which is in line with the thermal preference of the experimenters. The head-foot temperature difference in sitting position (i.e., the temperature difference at 1.1m and 0.1m) and the head-foot temperature difference in standing position (i.e., the temperature difference at 1.7m and 0.1m) of the measurement lines L1-L4 are between 1.6°C-4.6°C (average 2.5°C) and 2.2°C-2.6°C (average 2.4°C) respectively. Figure 4 – Figure 8 ). Compared with the existing methods, this method reduces the head-foot temperature difference by 39.0% and 45.3% in sitting and standing positions, respectively, which greatly alleviates the thermal discomfort problem caused by the large head-foot temperature difference.

[0047] In summary, the existing wall-mounted air conditioner heating method is limited by thermal buoyancy, resulting in heat accumulation in the upper space of the room, facing the problem of low energy efficiency in creating a thermal environment and thermal discomfort caused by a large temperature difference between the head and feet. The present invention uses the high-temperature hot air supply mode of the wall-mounted air conditioner to provide heat to the room, and uses the low-temperature hot air supply mode of the wall-mounted air conditioner to transfer the heat generated by the high-temperature hot air supply mode of the wall-mounted air conditioner that accumulates in the upper space of the room due to thermal buoyancy to the lower space of the room where the personnel activity area is located, so as to reuse the heat in the upper space of the room to create a thermal environment in the lower space of the room, and the energy saving rate reaches 22.6%; and the present invention reduces the temperature difference between the head and feet in the sitting and standing positions by 39.0% and 45.3% respectively, alleviating the thermal discomfort caused by the large temperature difference between the head and feet.

[0048] It is worth noting that if the following changes are made based on the invention, that is, if the low-temperature hot air supply mode does not use the air supply attached to the wall downward, but blows directly to the bottom space of the room where the personnel activity area is located, although its heat transfer effect is inferior to the low-temperature hot air supply mode proposed by the present invention, which uses the air supply attached to the wall downward, it can also play the function of the wall-mounted air conditioner as a heat transfer device to a certain extent. Therefore, the changes based on the present invention still fall within the protection scope of the present invention.

Claims

1. A high-efficiency heating method for a wall-mounted air conditioner with alternating switching between high-temperature and low-temperature hot air supply, characterized in that: The wall-mounted air conditioner switches alternately between high-temperature hot air supply mode and low-temperature hot air supply mode. The high-temperature hot air supply mode is generated by air conditioning heating to heat the room; the low-temperature hot air supply mode does not require air conditioning heating. The low-temperature hot air supply mode will reuse the hot air accumulated in the upper space of the room due to the thermal buoyancy of the hot air to create the lower space of the room where the personnel activity area is located, thereby reducing the thermal discomfort caused by the temperature difference between head and feet and improving the heating efficiency of air conditioning.

2. A wall-mounted air conditioner efficient heating method with alternating high-temperature and low-temperature hot air supply according to claim 1, characterized in that: In the high-temperature hot air supply mode, the air inlet of the air conditioner draws air from the upper space of the room into the interior of the air conditioner; the air entering the interior of the air conditioner is heated by the air conditioner, and then blown from the air conditioner outlet to the lower part of the room where the personnel activity area is located. The air supply angle and speed of the high-temperature hot air supply are determined according to the thermal comfort standard or the thermal preference of the personnel.

3. A wall-mounted air conditioner efficient heating method with alternating high-temperature and low-temperature hot air supply according to claim 1, characterized in that: In the low-temperature hot air supply mode, the air inlet of the air conditioner draws air from the upper space of the room into the interior of the air conditioner; the air entering the interior of the air conditioner is the hot air that is gathered in the upper space of the room due to thermal buoyancy and heated by the air conditioner in the high-temperature hot air supply mode. In the low-temperature air supply mode, it does not need to be heated by the air conditioner, and is blown from the air conditioner outlet to the lower space of the room where the personnel activity area is located. Due to the negative pressure area caused by the air inlet of the wall-mounted air conditioner, the hot air in the upper space of the room is efficiently sucked into the wall-mounted air conditioner by using the ceiling attachment effect.

4. A wall-mounted air conditioner efficient heating method with alternating high-temperature and low-temperature hot air supply according to claim 1, characterized in that: The air supply angle of the low-temperature hot air supply mode is downward, so that the low-temperature hot air flows downward along the wall, and the hot air in the upper space of the room is delivered to the lower space of the room where the personnel activity area is located by using the wall adhesion effect.

5. A wall-mounted air conditioner efficient heating method with alternating high-temperature and low-temperature hot air supply according to claim 4, characterized in that: The air supply angle of the low-temperature air supply mode is adjusted by the air supply outlet baffle of the wall-mounted air conditioner, by the air conditioner's external guide plate, or by other methods with similar functions.

6. A wall-mounted air conditioner efficient heating method with alternating high-temperature and low-temperature hot air supply according to claim 1, characterized in that: The low-temperature hot air supply in the low-temperature hot air supply mode adheres to the wall surface and flows toward the lower part of the room, while sucking in the indoor air along the way. The suction force is particularly strong in the upper space of the room, so more hot air from the upper space of the room is sent to the lower space of the room where the personnel activity area is located; because the low-temperature hot air supply transfers the hot air from the upper space of the room to the lower space of the room where the personnel activity area is located, the temperature difference between the head and feet is reduced, and the thermal discomfort problem caused by the excessive temperature difference between the head and feet is alleviated; at the same time, the low-temperature hot air supply will gather the hot air generated by the air-conditioning heating mode in the upper space of the space due to thermal buoyancy and use it again to create the lower space of the room where the personnel activity area is located, thereby improving the utilization efficiency of the hot air generated by the air-conditioning heating.

7. According to the efficient heating method for a wall-mounted air conditioner with alternating switching between high-temperature and low-temperature hot air supply as described in claim 1, the greater the air supply speed of the low-temperature hot air supply mode, the more hot air in the upper space of the room is supplied to the lower space of the room where the personnel activity area is located, but it will cause the air speed in the personnel activity area to increase; the maximum air supply speed of the low-temperature hot air supply mode is determined based on the limited value of the air speed in the personnel activity area caused by the low-temperature hot air supply mode, and the limited value of the air speed in the personnel activity area is determined based on the thermal comfort standard or the thermal preference of the personnel.

8. A wall-mounted air conditioner efficient heating method with alternating high-temperature and low-temperature hot air supply according to claim 1, characterized in that: The longer the low-temperature hot air supply mode works relative to the high-temperature hot air supply mode, the higher the air conditioning energy efficiency is. However, since the heat transferred from the upper space of the room is not enough to offset the cold entering the personnel activity area from the outside, the temperature of the personnel activity area decreases. The working time of the low-temperature hot air supply mode relative to the high-temperature hot air supply mode is determined by the limit value of the air temperature in the personnel activity area, and the limit value of the air temperature in the personnel activity area is determined based on the thermal comfort standard or the thermal preference of the personnel.

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