CN110736146B

CN110736146B - Double-air-duct air conditioner and dehumidification method and system thereof

Info

Publication number: CN110736146B
Application number: CN201910970846.0A
Authority: CN
Inventors: 王军; 别清峰; 李本卫
Original assignee: Hisense Shandong Air Conditioning Co Ltd
Current assignee: Hisense Shandong Air Conditioning Co Ltd
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2021-04-27
Anticipated expiration: 2039-10-12
Also published as: CN110736146A

Abstract

The invention relates to the field of refrigeration equipment, and discloses a double-air-channel air conditioner and a dehumidification method and system thereof. In the invention, whether the air conditioner meets the parameter conditions of entering a dehumidification mode of an ultra-low sensible heat and high latent heat load area, a dehumidification mode of a low sensible heat and high latent heat load area and a dehumidification mode of a middle and high sensible heat load areas is judged by acquiring a target temperature Ts and a target relative humidity phi set by a user in real time, and the rotating speeds of an upper fan and a lower fan are controlled under a certain dehumidification mode, so that the three dehumidification modes are mutually switched, especially when the dual-air-channel air conditioner operates in the dehumidification mode of the ultra-low sensible heat and high latent heat load area, the upper fan and the lower fan are controlled to operate at the lowest rotating speed at which the fans reliably operate, the evaporation temperature of a steam device is greatly reduced, the dehumidification capacity of the air conditioner is improved, the latent heat output of the compressor during low-frequency operation is improved, and the sensible heat output is reduced, constant temperature dehumidification is realized.

Description

Double-air-duct air conditioner and dehumidification method and system thereof

Technical Field

The invention relates to the field of refrigeration equipment, in particular to a double-air-channel air conditioner and a dehumidification method and system thereof.

Background

The total refrigerating capacity Qtotal output when the air conditioner refrigerates or dehumidifies is composed of sensible heat Qsensible heat and latent heat Qlatent heat. The load when the room is cooled is the sensible heat quantity Wsensible and latent heat quantity Wlatent required for reducing the current temperature and humidity to a certain set temperature and humidity. Sensible heat output by the air conditioner is used for reducing the room temperature of a user, and latent heat is used for reducing the relative humidity of the room.

Fig. 1 is a graph showing a distribution of load points (sensible heat amount + latent heat amount) of a room in a high-humidity city, a typical city being a typical house type of a fixed area in the state of guangzhou, when a temperature is set at 27 ℃ and a relative humidity is 50%, in a period of 5 months and 1 to 9 months and 30 days per year, as circled black points, with the abscissa representing the sensible heat load of the room and the ordinate representing the latent heat load of the room. The denser the round black dots, the longer the time of appearance. That is, high humidity cities, have a large demand for latent heat or dehumidification.

In fig. 1, the coverage area of the irregular graph is a two-dimensional coordinate graph of the horizontal coordinate sensible heat quantity and the vertical coordinate latent heat quantity output by the air conditioner, wherein the coverage area of the irregular graph is 1.5 variable frequency air conditioners matched with the typical room area, the output capacity (sensible heat quantity and latent heat quantity) of the air conditioner is realized when the outdoor temperature and humidity are fixed, the wind speed gear is respectively provided with strong wind, high wind, medium wind and low wind, and the compressor frequency is changed from low to high. The overlapping part is less because the 1.5-certain frequency ensures that the total output capacity is constant, and under the condition of 4 wind speeds, the sensible heat component is obviously large, the latent heat component is obviously small, so that the overlapping of the area of the sensible heat and latent heat load points of the room and the area surrounded by the sensible heat and latent heat output by the air conditioner is less. The overlapped part shows that the temperature and the humidity of the room can be controlled to the comfortable temperature and humidity set by the user due to the refrigerating output capacity of the air conditioner. The non-overlapping part shows that the refrigerating output of the air conditioner is controlled to the temperature or the humidity which meets the comfortable temperature or the humidity set by the user. If the air conditioner controls the temperature to the temperature set by the user, the humidity can not be reduced, the humidity is still high, the user feels uncomfortable, and the air is humid; if the air conditioner controls the humidity to the humidity set by the user, the temperature may be lower than the set temperature of the user, and the user feels cold or very cold. For example, the following steps are carried out: on a certain day, the sensible heat load of the room is 1500W, the latent heat load is 800W, the sensible heat component of the output capacity of the 1.5-air conditioner is 1500W, the latent heat component is 800W, and the room temperature and humidity can be controlled to the temperature and humidity set by the user (such as 27 ℃ and 50% relative humidity). On a certain day, the sensible heat load of the room is 800W, the latent heat load is 600W, if the sensible heat component of the output capacity is 800W, and the latent heat component is 200W, the temperature of the room can be only controlled to be about 27 ℃ which is set by a user, but the humidity is obviously higher than 50%; if the latent heat component of the output capacity is 600W, the sensible heat component is 1400W, and the humidity can be controlled to about 50% at this time, but the room temperature is significantly lower than 27 ℃, which causes the user to be significantly colder.

Fig. 2 is a distribution diagram of load points (sensible heat amount + latent heat amount) dividing an output load of an air conditioner into four areas according to conditions such as outdoor environment temperature, indoor relative humidity, set temperature and the like when the air conditioner is cooled or dehumidified, wherein an area indicated by a reference mark a in fig. 2 is a middle and high sensible heat load area, and the air conditioner mainly cools down and secondarily dehumidifies; the area marked by the mark B in FIG. 2 is a low sensible heat and low latent heat load area, and the cooling and dehumidifying requirements of the air conditioner are low; the area indicated by the reference number C in fig. 2 is a low sensible heat and high latent heat load area, the gear of the indoor fan is extended downward for several gears (rotating speed is reduced), the latent heat component of the air conditioner is increased, and the sensible heat component is reduced, although full coverage cannot be realized, the coverage area is obviously increased compared with the original wind speed gear; the area designated by the reference numeral D in fig. 2 is an ultra-low sensible heat and high latent heat load area, and is also an area which cannot be covered by the existing air conditioning product.

The reason why the ultra-low sensible heat load and the ultra-high latent heat load occur and the sensible heat output and the latent heat output of the air conditioner cannot meet the dehumidification requirement is that when the air conditioner compressor operates at a low frequency, the area of the evaporator is too large, the temperature is close to the dew point temperature or even higher than the dew point temperature, the latent heat capacity of the air conditioner is almost 0, and the dehumidification capacity is lost.

In order to meet the requirement that the room load of the area is fully covered by latent heat and sensible heat during refrigeration of the air conditioner, the optimal scheme is a scheme of not cooling and dehumidifying, the room temperature and the room humidity can be controlled to the comfortable temperature and humidity of a user, but the whole machine cost is greatly increased and the energy efficiency is reduced due to the fact that the air conditioner is not cooled and dehumidified, and air conditioner products which are not cooled and dehumidified are fresh in the market actually.

Therefore, how to improve the dehumidification capability of the low-temperature and high-humidity areas in the air conditioner in plum rain seasons without increasing extra or small cost becomes an industrial problem.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, the invention aims to provide a double-air-channel air conditioner, a dehumidification method and a dehumidification system thereof, wherein the double-air-channel air conditioner can reduce sensible heat output of the air conditioner, improve latent heat output and realize constant-temperature dehumidification.

In order to achieve the purpose, the invention adopts the following technical scheme:

the embodiment of the first aspect of the invention provides a dehumidification method of a double-air-channel air conditioner, which is characterized in that an indoor unit of the double-air-channel air conditioner comprises an upper air channel and a lower air channel, wherein an upper fan and an upper evaporator are arranged on the upper air channel, and a lower fan and a lower evaporator are arranged on the lower air channel; the dehumidification method of the double-air-duct air conditioner comprises the following steps of:

after the double-air-duct air conditioner receives a dehumidification instruction or operates in a refrigeration mode, acquiring a target temperature Ts and a target relative humidity phi set by a user, and acquiring an indoor environment temperature Tin, an outdoor environment temperature Tout and an indoor relative humidity phi in real time;

judging whether the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is less than or equal to a first preset temperature difference E1, and simultaneously judging whether the indoor relative humidity phi is greater than or equal to a first preset relative humidity phi 1 or the difference value delta phi between the indoor relative humidity phi and the target relative humidity phi s is greater than or equal to a preset relative humidity difference phi 2;

if the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is smaller than or equal to a first preset temperature difference E1, and the indoor relative humidity phi is larger than or equal to a preset relative humidity phi 1 or the difference value delta phi between the indoor relative humidity phi and the target relative humidity phi s is larger than or equal to a preset relative humidity difference phi 2, the double-air-duct air conditioner enters a dehumidification mode of an ultralow sensible heat high latent heat load area;

when the double-air-channel air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area, controlling a compressor of the double-air-channel air conditioner to operate at a low frequency, and controlling the upper fan and the lower fan to operate at the lowest rotating speed at which the fans can operate reliably;

judging whether a target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a first preset temperature difference E1 and less than or equal to a second preset temperature difference E2, and simultaneously judging whether the indoor relative humidity phi is greater than or equal to a preset relative humidity phi 1 or the difference value delta phi between the indoor relative humidity phi and the target relative humidity phi s is greater than or equal to a preset relative humidity phi 2;

if the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a first preset temperature difference E1 and less than or equal to a second preset temperature difference E2, and meanwhile, the indoor relative humidity phi is greater than or equal to a preset relative humidity phi 1 or the difference delta phi between the indoor relative humidity phi and the target relative humidity phi s is greater than or equal to a preset relative humidity difference phi 2, the double-air-duct air conditioner enters a dehumidification mode of a low-sensible-heat high-latent-heat load area;

when the double-air-channel air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area, controlling a compressor of the double-air-channel air conditioner to operate at a low frequency, and controlling the upper fan and the lower fan to operate at a low wind gear;

judging whether a target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a second preset temperature difference E2 or not, and the outdoor environment temperature Tout is greater than or equal to the outdoor preset temperature Tout 1;

if the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a second preset temperature difference E2, and the outdoor environment temperature Tout is greater than or equal to the outdoor preset temperature Tout1, the dual-air-duct air conditioner enters a dehumidification mode of a middle and high sensible heat load area;

when the double-air-duct air conditioner operates in a dehumidification mode of a middle and high sensible heat load area, controlling the upper fan and the lower fan to operate at a wind speed gear set by a user;

wherein E2 is more than or equal to 3 ℃ and E1 is more than or equal to-1 ℃, Tout1 is more than or equal to 24 ℃, 100 percent is more than or equal to phi 1 and more than or equal to 70 percent, and 50 percent is more than or equal to phi 2 and more than or equal to 10 percent.

As a preferable mode of the dehumidification method of the present invention, during the operation of the dual air conditioner in the dehumidification mode of the ultra-low sensible heat and high latent heat load region, the rotation speed R of the upper fan is changed according to a change in the temperature Te _ up of the upper evaporator, and the rotation speed R of the lower fan is changed according to a change in the temperature Te _ down of the lower evaporator;

the control of the rotating speed R of the upper fan is specifically as follows: after the double-air-duct air conditioner operates in a dehumidification mode with ultralow sensible heat and high latent heat load area for a time period of t1, when the temperature Te _ up of the upper evaporator is within a preset threshold range, namely Te2 is more than Te _ up is more than Te1, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the previous operating period of the upper fan; when the temperature Te _ up of the upper evaporator is not more than Te1, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the last operating period of the upper fan, and the rotating speed Delta R of a preset gear of the upper fan is increased; the double-air-duct air conditioner detects the temperature Te _ up of the upper evaporator once per t2 running time in a dehumidification mode of an ultralow sensible heat and high latent heat load area, and further continuously confirms the rotating speed of a new lower fan;

the control of the rotating speed r of the lower fan is specifically as follows: after the double-air-duct air conditioner operates in a dehumidification mode with ultralow sensible heat and high latent heat load area for a time period of t1, when the temperature Te _ down of the lower evaporator is in a preset threshold range, namely Te2 is more than Te _ down which is more than Te1, the rotating speed r (n +1) of the next operating period of the lower fan is equal to the rotating speed r (n) of the last operating period of the lower fan; when the temperature Te _ down of the lower evaporator is less than or equal to Te1, the rotating speed r (n +1) of the lower fan in the next operating period is equal to the rotating speed r (n) of the lower fan in the last operating period, and the rotating speed deltar of the upper fan in a preset gear is increased; the double-air-duct air conditioner detects the temperature Te _ down of the lower evaporator once per t2 running time in a dehumidification mode of an ultralow sensible heat and high latent heat load area, and further continuously confirms the rotating speed of a new lower fan;

wherein t1 is more than or equal to 0.5min, t2 is more than or equal to 0.5min, Te2 is more than or equal to 5 ℃ and more than Te1 is more than or equal to-1 ℃, delta R is more than or equal to 1rpm, delta R is more than or equal to 1rpm, the upper limit value of R is the lowest rotating speed of the upper fan in reliable operation, the upper limit value of R is the lowest rotating speed of the lower fan in reliable operation, and the lower limit value of R is the lowest rotating speed of the lower fan in reliable operation.

As a preferable mode of the dehumidification method of the present invention, during the operation of the dual air conditioner in the dehumidification mode of the low sensible heat and high latent heat load region, the rotation speed R of the upper fan is changed according to a change in a difference Δ T between the dew point temperature TL and the temperature Te _ up of the upper evaporator, and the rotation speed R of the lower fan is changed according to a change in a difference Δ T between the dew point temperature TL and the temperature Te _ down of the lower evaporator;

the control of the rotating speed R of the upper fan is specifically as follows: after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, when the indoor relative humidity phi is larger than the target relative humidity phi s, if delta T is within a preset threshold range, namely T2 is not less than delta T is not less than T1, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the previous operating period of the upper fan; if Δ T is less than T2, the rotation speed R (n +1) of the upper fan in the next operation period is equal to the rotation speed R (n) of the upper fan in the previous operation period minus a preset gear rotation speed Δ R of the upper fan; if Δ T > T1, the rotation speed R (n +1) of the upper fan in the next operation period is equal to the rotation speed R (n) of the upper fan in the previous operation period, and the rotation speed of the upper fan at a preset gear is increased by Δ R; when the indoor relative humidity phi is less than or equal to the target relative humidity phi s, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the last operating period of the upper fan; the double-air-duct air conditioner detects the indoor environment temperature Tin, the indoor relative humidity phi and the temperature Te _ up of the upper evaporator once per T2 running time in an ultra-low sensible heat high latent heat load area dehumidification mode, automatically corrects according to an indoor environment temperature-indoor relative humidity-dew point temperature comparison table in the system to obtain a new dew point temperature TL, calculates delta T and further confirms the new rotating speed of the upper fan;

the control of the rotating speed r of the lower fan is specifically as follows: after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, when the indoor relative humidity phi is larger than the target relative humidity phi s, if delta T is within a preset threshold range, namely, the T2 is not less than delta T is not less than T1, the rotating speed r (n +1) of the lower operating period of the lower fan is equal to the rotating speed r (n) of the upper fan in the previous operating period; if delta T is less than T2, the rotating speed r (n +1) of the next operating period of the upper fan is equal to the rotating speed r (n) of the last operating period of the upper fan minus a preset gear rotating speed delta r of the upper fan; if Δ T > T1, the rotation speed r (n +1) of the upper fan in the next operation period is equal to the rotation speed r (n) of the upper fan in the previous operation period, and the rotation speed of the upper fan at a preset gear is increased by Δ r; when the indoor relative humidity phi is less than or equal to the target relative humidity phi s, the rotating speed r (n +1) of the lower fan in the next operating period is equal to the rotating speed r (n) of the upper fan in the previous operating period; the double-air-duct air conditioner detects the indoor environment temperature Tin, the indoor relative humidity phi and the temperature Te _ down of the lower evaporator once per T2 running time in an ultralow sensible heat high latent heat load area dehumidification mode, automatically corrects according to an indoor environment temperature-indoor relative humidity-dew point temperature comparison table in the system to obtain a new dew point temperature TL, calculates delta T and further confirms the new rotating speed of the lower fan;

wherein the temperature of 20 ℃ is more than or equal to T1, more than or equal to T2, more than or equal to 0 ℃, T1, more than or equal to 0.5min, T2, more than or equal to 5 ℃ is more than or equal to Te2, more than or equal to-1 ℃ is more than or equal to Te1, delta R is more than or equal to 1rpm, delta R is more than or equal to 1rpm, the upper limit value of R is the low wind gear rotating speed of the upper fan, the lower limit value of R is the lowest rotating speed of the upper fan in reliable operation, the upper limit value of R is the low wind gear rotating speed of the lower fan, and the lower limit value of R is the.

As a preferable scheme of the dehumidification method of the present invention, an upper electric heater is disposed on the upper air duct, a lower electric heater is disposed on the lower air duct, and during the continuous operation of the dual-air-duct air conditioner in the dehumidification mode of the ultra-low sensible heat and high latent heat load region, if the target temperature difference E is less than or equal to a third preset temperature difference E3, one or both of the upper electric heater and the lower electric heater are turned on, wherein E3 is less than or equal to-1 ℃.

As the preferred scheme of the dehumidification method of the invention, the frequency F of the compressor of the double-air-channel air conditioner is in positive and strong correlation with the target temperature difference E, and the larger the value of E is, the higher the frequency F is; when the double-air-channel air conditioner operates in the dehumidification mode of the ultralow sensible heat and high latent heat load area, the frequency F of the compressor of the double-air-channel air conditioner is Fmin at the minimum value and N1% of Fmax at the maximum value; when the double-air-channel air conditioner operates in a dehumidification mode of a low-sensible-heat high-latent-heat load area, the frequency F of a compressor of the double-air-channel air conditioner is Fmin at the minimum value and N2% of Fmax at the maximum value; wherein N1 is more than N2 and less than or equal to 50, N1 percent Fmax and N2 percent Fmax both belong to the low-frequency interval of the compressor, Fmin is the minimum frequency of reliable operation of the compressor, and Fmax is the maximum frequency of reliable operation of the compressor.

An embodiment of a second aspect of the present invention provides a dehumidification system of a dual air conditioner, where an indoor unit of the dual air conditioner includes an upper air duct and a lower air duct, the upper air duct is provided with an upper fan and an upper evaporator, and the lower air duct is provided with a lower fan and a lower evaporator; the dehumidification system of the double-air-duct air conditioner comprises:

the acquisition module is used for acquiring a target temperature Ts and a target relative humidity phi s set by a user and acquiring an indoor environment temperature Tin, an outdoor environment temperature Tout and an indoor relative humidity phi in real time;

the judging module is used for judging whether the double-air-channel air conditioner meets a first parameter condition required for entering a dehumidification mode of an ultralow sensible heat and high latent heat load area, judging whether the double-air-channel air conditioner meets a second parameter condition required for entering the dehumidification mode of a low sensible heat and high latent heat load area, and judging whether the double-air-channel air conditioner meets a third parameter condition required for entering a dehumidification mode of a medium sensible heat and high sensible heat load area; the first parameter condition is that the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is smaller than or equal to a first preset temperature difference E1, and meanwhile, the indoor relative humidity phi is larger than or equal to a first preset relative humidity phi 1 or the difference value delta phi between the indoor relative humidity phi and the target relative humidity phi s is larger than or equal to a preset relative humidity difference phi 2; the second parameter condition is that the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a first preset temperature difference E1 and less than or equal to a second preset temperature difference E2, and meanwhile, the indoor relative humidity phi is greater than or equal to a preset relative humidity phi 1 or the difference value delta phi between the indoor relative humidity phi and the target relative humidity phi s is greater than or equal to a preset relative humidity difference phi 2; the third parameter condition is that the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a second preset temperature difference E2, and the outdoor environment temperature Tout is greater than or equal to the outdoor preset temperature Tout 1; wherein E2 is more than or equal to 3 ℃ and E1 is more than or equal to-1 ℃, Tout1 is more than or equal to 24 ℃, 100 percent is more than or equal to phi 1 and more than or equal to 70 percent, and 50 percent is more than or equal to phi 2 and more than or equal to 10 percent;

the control module is used for controlling the compressor of the double-air-channel air conditioner to operate at a low frequency and controlling the upper fan and the lower fan to operate at the lowest rotating speed at which the fans operate reliably when the double-air-channel air conditioner is judged to need to enter a dehumidification mode of an ultralow sensible heat and high latent heat load area; the system comprises a double-air-channel air conditioner, an upper fan, a lower fan, a control module and a control module, wherein the double-air-channel air conditioner is used for controlling the compressor of the double-air-channel air conditioner to operate at low frequency and controlling the upper fan and the lower fan to operate at a low wind gear when judging that the double-air-channel air conditioner needs to enter a dehumidification mode of a low sensible heat and; and the control unit is used for controlling the upper fan and the lower fan to operate at a wind speed gear set by a user when the double-air-channel air conditioner is judged to need to enter a dehumidification mode of a middle and high sensible heat load area.

As a preferable scheme of the dehumidification system of the present invention, the obtaining module is further configured to obtain a temperature Te _ up of the upper evaporator, a temperature Te _ down of the lower evaporator, and a dew point temperature TL in real time; the judging module is further used for judging whether the upper fan meets a fourth parameter condition required for keeping the rotating speed unchanged, judging whether the upper fan meets a fifth parameter condition required for reducing the rotating speed, judging whether the upper fan meets a sixth parameter condition required for increasing the rotating speed, judging whether the lower fan meets a seventh parameter condition required for keeping the rotating speed unchanged, and judging whether the lower fan meets an eighth parameter condition required for increasing the rotating speed; the fourth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is less than or equal to a target relative humidity phi s, or the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is within a preset threshold range, namely, the difference delta T is greater than or equal to T2 and less than or equal to T1; the fifth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is less than T2; the sixth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is greater than T1; the seventh parameter condition is that after the double-air-channel air conditioner operates for t1 time period in a dehumidification mode of an ultralow sensible heat and high latent heat load area, the temperature Te _ down of the lower evaporator is in a preset threshold range, namely Te2 is more than Te _ down is more than Te 1; the eighth parameter condition is that the temperature Te _ down of the lower evaporator is less than or equal to Te1 after the double-air-channel air conditioner operates for t1 time period in a dehumidification mode of a low sensible heat and high latent heat load area; the control module is further used for controlling the rotating speed of the upper fan to keep unchanged when the parameter condition is judged to be a fourth parameter condition, controlling the rotating speed of the upper fan to reduce by delta R when the parameter condition is judged to be a fifth parameter condition, controlling the rotating speed of the upper fan to increase by delta R when the parameter condition is judged to be a sixth parameter condition, controlling the rotating speed of the lower fan to keep unchanged when the parameter condition is judged to be a seventh parameter condition, and controlling the rotating speed of the lower fan to increase by delta R when the parameter condition is judged to be an eighth parameter condition; wherein the temperature is not less than 20 ℃ and not less than T1 and not less than T2 and not less than 0 ℃, T1 and not less than 0.5min, the temperature is not less than 5 ℃ and not less than Te2 and not less than Te1 and not less than-1 ℃, the delta R and not less than 1rpm, the upper limit value of R is the low wind gear rotating speed of the upper fan, the lower limit value of R is the lowest rotating speed of the upper fan in reliable operation, the upper limit value of R is the low wind gear rotating speed of the lower fan, and the lower limit value of R is the lowest rotating speed of the lower fan in reliable operation.

As a preferable scheme of the dehumidification system of the present invention, the obtaining module is further configured to obtain a temperature Te _ up of the upper evaporator, a temperature Te _ down of the lower evaporator, and a dew point temperature TL in real time; the judging module is further used for judging whether the upper fan meets a fourth parameter condition required for keeping the rotating speed unchanged, judging whether the upper fan meets a fifth parameter condition required for reducing the rotating speed, judging whether the upper fan meets a sixth parameter condition required for increasing the rotating speed, judging whether the lower fan meets a seventh parameter condition required for keeping the rotating speed unchanged, judging whether the lower fan meets an eighth parameter condition required for reducing the rotating speed, and judging whether the lower fan meets a ninth parameter condition required for increasing the rotating speed; the fourth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for T1 time period, the indoor relative humidity phi is less than or equal to a target relative humidity phi s, or the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is within a preset threshold range, namely, the difference delta T between the T2 and the T1 is greater than or equal to; the fifth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is less than T2; the sixth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is greater than T1; the seventh parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is less than or equal to the target relative humidity phi s, or the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ down of the lower evaporator is within a preset threshold range, namely, the delta T is more than or equal to T2 and less than or equal to T1; the eighth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew-point temperature TL and the temperature Te _ down of the lower evaporator is less than T2; the ninth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew point temperature TL and the temperature Te _ down of the lower evaporator is greater than T1; the control module is further used for controlling the rotating speed of the upper fan to keep unchanged when the parameter condition is judged to be a fourth parameter condition, controlling the rotating speed of the upper fan to reduce by delta R when the parameter condition is judged to be a fifth parameter condition, controlling the rotating speed of the upper fan to increase by delta R when the parameter condition is judged to be a sixth parameter condition, controlling the rotating speed of the lower fan to keep unchanged when the parameter condition is judged to be a seventh parameter condition, controlling the rotating speed of the lower fan to reduce by delta R when the parameter condition is judged to be an eighth parameter condition, and controlling the rotating speed of the lower fan to increase by delta R when the parameter condition is judged to be a ninth parameter condition; wherein the temperature is not less than 20 ℃ and not less than T1 and not less than T2 and not less than 0 ℃, T1 and not less than 0.5min, the temperature is not less than 5 ℃ and not less than Te2 and not less than Te1 and not less than-1 ℃, the delta R and not less than 1rpm, the upper limit value of R is the low wind gear rotating speed of the upper fan, the lower limit value of R is the lowest rotating speed of the upper fan in reliable operation, the upper limit value of R is the low wind gear rotating speed of the lower fan, and the lower limit value of R is the lowest rotating speed of the lower fan in reliable operation.

As a preferred scheme of the dehumidification system of the invention, an upper electric heater is arranged on the upper air channel, and a lower electric heater is arranged on the lower air channel; the judging module is also used for judging whether the upper electric heater and the lower electric heater meet a tenth parameter condition required by starting; wherein the tenth parameter condition is that the target temperature difference E is less than or equal to a third preset temperature difference E3, and E3 is less than or equal to minus 1 ℃; the control module is further used for controlling one or two of the upper electric heater and the lower electric heater to be turned on when the parameter condition is judged to be the tenth parameter condition.

An embodiment of a third aspect of the present invention provides a dual-duct air conditioner, which includes the above-mentioned dehumidification system of a dual-duct air conditioner, wherein the indoor unit of a dual-duct air conditioner further includes a humidity sensor for detecting indoor relative humidity, a first temperature sensor for detecting indoor ambient temperature, a second temperature sensor for detecting temperature of an upper evaporator, and a third temperature sensor for detecting temperature of a lower evaporator, the humidity sensor, the first temperature sensor, the second temperature sensor, and the third temperature sensor are respectively electrically connected to the acquisition module, a partition board is disposed between the upper duct and the lower duct, a total inlet of the upper evaporator and a total inlet of the lower evaporator are respectively connected to a total splitter, the upper evaporator includes 1 or more than 1 branch, when the upper evaporator consists of more than 1 branch, an upper splitter is arranged at the inlet of the branch of the upper evaporator, and the second temperature sensor is arranged at the middle position of one branch of the upper evaporator; the lower evaporator comprises 1 or more than 1 branch, and when the lower evaporator consists of more than 1 branch, a lower splitter is arranged at the inlet of the branch of the lower evaporator, and the third temperature sensor is arranged in the middle of one branch of the lower evaporator.

Compared with the prior art, the double-air-channel air conditioner and the dehumidification method and the system thereof have the advantages that:

the embodiment of the invention judges whether the air conditioner meets the parameter conditions of entering the dehumidification mode of the ultra-low sensible heat high latent heat load area, the dehumidification mode of the medium and high sensible heat load areas by acquiring the target temperature Ts and the target relative humidity phi set by a user in real time and acquiring the indoor ambient temperature Tin, the outdoor ambient temperature Tout and the indoor relative humidity phi in real time, controls the rotating speeds of the upper fan and the lower fan in a certain dehumidification mode and changes the sensible heat component and the latent heat component of the air conditioner, thereby realizing the mutual switching among the dehumidification mode of the ultra-low sensible heat high latent heat load area, the dehumidification mode of the low sensible heat high latent heat load area and the dehumidification mode of the medium and high sensible heat load areas, improving the coverage area of the load point of the air conditioner, particularly controlling the upper fan and the lower fan to operate at the lowest rotating speed at which the fans are reliable when the dual-air conditioner operates in the ultra-low sensible heat high latent heat load, greatly reduced the evaporating temperature of steamer, promoted the dehumidification ability of air conditioner, and then improved the latent heat output when the compressor low frequency operation, reduced sensible heat output, realize the constant temperature dehumidification, effectively guarantee that the air conditioner can normally dehumidify in the high latent heat load district of ultralow sensible heat, and room temperature does not reduce or reduce slightly, makes the air conditioner adapt to the room load of more time quantum in the season of refrigerating, realizes that temperature, humidity can both control the travelling comfort demand that the user is satisfied.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a distribution diagram of load points of a room in a high-humidity city, a typical room type of a fixed area, with a temperature of 27 ℃ and a relative humidity of 50%, during a period of 5 months and 1 day to 9 months and 30 days per year;

fig. 2 is a distribution diagram of load points dividing an output load of an air conditioner into four regions according to conditions such as an outdoor ambient temperature, an indoor relative humidity, and a set temperature;

fig. 3 is a schematic structural view of an indoor unit of a dual duct air conditioner according to the present invention;

FIG. 4 is a flow chart of a dehumidification method of a dual-duct air conditioner according to the present invention;

fig. 5 is a connection block diagram of a dehumidification system of a dual duct air conditioner according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 3 is a schematic structural diagram of a dual air-conditioner according to an embodiment of the present invention, and as shown in fig. 3, the indoor unit of the dual air-conditioner includes an upper air duct 1 and a lower air duct 2, an upper fan and an upper evaporator 3 are disposed on the upper air duct 1, and a lower fan and a lower evaporator 4 are disposed on the lower air duct 2.

Fig. 4 is a flowchart of a dehumidification method of a dual-duct air conditioner according to an embodiment of the present invention, and as shown in fig. 4, the dehumidification method of the dual-duct air conditioner includes the following steps:

step S101, after the double-air-duct air conditioner receives a dehumidification instruction or operates in a refrigeration mode, acquiring a target temperature Ts and a target relative humidity phi set by a user, and acquiring an indoor environment temperature Tin, an outdoor environment temperature Tout and an indoor relative humidity phi in real time; specifically, the user may send a power-on instruction to the air conditioner through a remote controller of the air conditioner, a control display screen of the air conditioner, an APP of the mobile terminal, a client of the PC, and the like, to control the air conditioner to power on, and set a target temperature Ts and a target relative humidity φ s of the air conditioner. Generally, the range of the phi s manually set by the user is 30% to 70% of the relative humidity interval that is comfortable for human, i.e. the upper limit of the phi s is 70% and the lower limit is 30%, if the user does not manually set the phi s, the phi s is a certain relative humidity in the default humidity comfort interval of 30% to 70%, such as 60%, and is determined by the manufacturer setting.

Step S102, judging whether a target temperature difference E between a target temperature Ts and an indoor environment temperature Tin is smaller than or equal to a first preset temperature difference E1, and simultaneously judging whether an indoor relative humidity phi is larger than or equal to a first preset relative humidity phi 1 or a difference value delta phi between the indoor relative humidity phi and the target relative humidity phi S is larger than or equal to a preset relative humidity difference phi 2;

step S103, if the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is smaller than or equal to a first preset temperature difference E1, and the indoor relative humidity phi is larger than or equal to a preset relative humidity phi 1 or the difference value delta phi between the indoor relative humidity phi and the target relative humidity phi S is larger than or equal to a preset relative humidity difference phi 2, the double-air-duct air conditioner enters a dehumidification mode of an ultralow sensible heat high latent heat load area;

step S104, when the double-air-channel air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area, controlling a compressor of the double-air-channel air conditioner to operate at a low frequency, and controlling the upper fan and the lower fan to operate at the lowest rotating speed at which the fans reliably operate; the lowest rotating speed at which the fan can operate reliably is the rotating speed at which the controller can control the motor to operate stably (the rotating speed is lower, and the fan may operate unbalanced), and is determined by the design of a manufacturer.

Step S105, judging whether a target temperature difference E between a target temperature Ts and an indoor environment temperature Tin is larger than a first preset temperature difference E1 and smaller than or equal to a second preset temperature difference E2, and simultaneously judging whether an indoor relative humidity phi is larger than or equal to a preset relative humidity phi 1 or a difference value delta phi between the indoor relative humidity phi and a target relative humidity phi S is larger than or equal to a preset relative humidity phi 2;

step S106, if the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a first preset temperature difference E1 and less than or equal to a second preset temperature difference E2, and meanwhile, the indoor relative humidity phi is greater than or equal to a preset relative humidity phi 1 or the difference value delta phi between the indoor relative humidity phi and the target relative humidity phi S is greater than or equal to a preset relative humidity difference phi 2, the double-air-duct air conditioner enters a dehumidification mode of a low sensible heat high latent heat load area;

step S107, when the double-air-channel air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area, controlling a compressor of the double-air-channel air conditioner to operate at a low frequency, and controlling the upper fan and the lower fan to operate at a low wind gear;

step S108, judging whether a target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a second preset temperature difference E2 or not, and the outdoor environment temperature Tout is greater than or equal to the outdoor preset temperature Tout 1;

step S109, if the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a second preset temperature difference E2, and the outdoor environment temperature Tout is greater than or equal to the outdoor preset temperature Tout1, the double-air-duct air conditioner enters a dehumidification mode of a middle and high sensible heat load area;

step S110, when the double-air-duct air conditioner operates in a dehumidification mode of a middle and high sensible heat load area, controlling the upper fan and the lower fan to operate at a wind speed gear set by a user;

It should be noted that, steps S102 to S104, steps S105 to S107, and steps S108 to S110 are independent from each other, and the ultra-low sensible heat and high latent heat load dehumidification mode, the low sensible heat and high latent heat load dehumidification mode, and the medium and high sensible heat load dehumidification mode can be switched to each other if corresponding preset parameter conditions are satisfied, because the temperature and humidity of the room are changed during the air conditioning dehumidification.

Therefore, the dehumidification method of the double-air-channel air conditioner provided by the embodiment of the invention can realize the mutual switching among the dehumidification mode of the ultra-low sensible heat high latent heat load area, the dehumidification mode of the low sensible heat high latent heat load area and the dehumidification mode of the middle and high sensible heat load areas, improves the coverage area of the load point of an air conditioner product, particularly controls the upper fan and the lower fan to operate at the lowest rotating speed at which the fans reliably operate when the double-air-channel air conditioner operates in the dehumidification mode of the ultra-low sensible heat high latent heat load area, greatly reduces the evaporation temperature of a steam generator, improves the dehumidification capacity of the air conditioner, further improves the latent heat output when the compressor operates at low frequency, reduces the sensible heat output, realizes constant temperature dehumidification, effectively ensures that the air conditioner can perform normal dehumidification in the ultra-low sensible heat high latent heat load area, does not reduce or slightly reduces the room temperature, and enables the air conditioner to adapt to the room load, the comfort requirement that the temperature and the humidity can be controlled to satisfy the user is realized.

Based on the above embodiment, because the influence of the rotating speed of the indoor fan on the temperature of the evaporator is considered, in order to adapt to the change of the temperature of the evaporator, the dehumidifying capability of the air conditioner is more reliable and energy-saving, so the rotating speed of the indoor fan and the temperature change relation of the evaporator can be designed according to the operation mode of the dual-air-channel air conditioner, which is specifically as follows:

firstly, during the operation of the double-air-channel air conditioner in a dehumidification mode of an ultralow sensible heat and high latent heat load area, the rotating speed R of the upper fan is changed according to the change of the temperature Te _ up of the upper evaporator 3, and the rotating speed R of the lower fan is changed according to the change of the temperature Te _ down of the lower evaporator 4;

the control of the rotating speed R of the upper fan is specifically as follows: after the dual-air-duct air conditioner operates in the ultra-low sensible heat high latent heat load area dehumidification mode for t1 time period, because the initial rotating speed of the upper fan is very low, and the evaporation temperature is very low, the detected anti-freezing protection value of the temperature Te _ up of the upper evaporator 3 is lower than that in the non-ultra-low sensible heat high latent heat load area dehumidification mode, and the anti-freezing protection value (preventing the evaporator from freezing) of the upper evaporator 3 is set between Te 1-Te 2. When the temperature Te _ up of the upper evaporator 3 is in a preset threshold range, namely Te2 is more than Te _ up is more than Te1, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the last operating period of the upper fan; when the temperature Te _ up of the upper evaporator 3 is not more than Te1, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the last operating period of the upper fan, and the rotating speed Delta R of a preset gear of the upper fan is increased; the double-air-duct air conditioner detects the temperature Te _ up of the upper evaporator 3 once per t2 running time in a dehumidification mode of an ultralow sensible heat and high latent heat load area, and further continuously confirms the rotating speed of a new lower fan;

the control of the rotating speed r of the lower fan is specifically as follows: after the double-air-duct air conditioner operates in the ultra-low sensible heat high latent heat load area dehumidification mode for t1 time period, because the initial rotating speed of the lower fan is very low, and the evaporation temperature is very low, the detected anti-freezing protection value of the temperature Te _ down of the lower evaporator 4 is lower than that of the non-ultra-low sensible heat high latent heat load area dehumidification mode in the ultra-low sensible heat high latent heat load area dehumidification mode, and the anti-freezing protection value (for preventing the evaporator from freezing) of the lower evaporator 4 is set between Te 1-Te 2. When the temperature Te _ down of the lower evaporator 4 is within a preset threshold range, i.e., Te2 > Te _ down > Te1, the rotation speed r (n +1) of the lower fan in the next operating period is equal to the rotation speed r (n) of the lower fan in the previous operating period; when the temperature Te _ down of the lower evaporator 4 is less than or equal to Te1, the rotating speed r (n +1) of the lower fan in the next operating period is equal to the rotating speed r (n) of the lower fan in the last operating period, and the rotating speed deltar of the upper fan in a preset gear is increased; the double-air-duct air conditioner detects the temperature Te _ down of the lower evaporator 4 once per t2 running time in a dehumidification mode of an ultralow sensible heat and high latent heat load area, and further continuously confirms the rotating speed of a new lower fan.

Secondly, in the process of operating the double-air-duct air conditioner in a dehumidification mode of a low sensible heat and high latent heat load area, the rotating speed R of the upper fan changes according to the change of the difference value delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator 3, and the rotating speed R of the lower fan changes according to the change of the difference value delta T between the dew point temperature TL and the temperature Te _ down of the lower evaporator 4.

The control of the rotating speed R of the upper fan is specifically as follows: after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, when the indoor relative humidity phi is larger than the target relative humidity phi s, if delta T is within a preset threshold range, namely T2 is not less than delta T is not less than T1, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the previous operating period of the upper fan; if Δ T is less than T2, the rotation speed R (n +1) of the upper fan in the next operation period is equal to the rotation speed R (n) of the upper fan in the previous operation period minus a preset gear rotation speed Δ R of the upper fan; if Δ T > T1, the rotation speed R (n +1) of the upper fan in the next operation period is equal to the rotation speed R (n) of the upper fan in the previous operation period, and the rotation speed of the upper fan at a preset gear is increased by Δ R; when the indoor relative humidity phi is less than or equal to the target relative humidity phi s, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the last operating period of the upper fan; the double-air-duct air conditioner detects the indoor environment temperature Tin, the indoor relative humidity phi and the temperature Te _ up of the upper evaporator 3 once per T2 running time in an ultralow sensible heat high latent heat load area dehumidification mode, automatically corrects according to an indoor environment temperature-indoor relative humidity-dew point temperature comparison table in the system to obtain a new dew point temperature TL, calculates delta T, and then confirms the new rotating speed of the upper fan.

The control of the rotating speed r of the lower fan is specifically as follows: after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, when the indoor relative humidity phi is larger than the target relative humidity phi s, if delta T is within a preset threshold range, namely, the T2 is not less than delta T is not less than T1, the rotating speed r (n +1) of the lower operating period of the lower fan is equal to the rotating speed r (n) of the upper fan in the previous operating period; if delta T is less than T2, the rotating speed r (n +1) of the next operating period of the upper fan is equal to the rotating speed r (n) of the last operating period of the upper fan minus a preset gear rotating speed delta r of the upper fan; if Δ T > T1, the rotation speed r (n +1) of the upper fan in the next operation period is equal to the rotation speed r (n) of the upper fan in the previous operation period, and the rotation speed of the upper fan at a preset gear is increased by Δ r; when the indoor relative humidity phi is less than or equal to the target relative humidity phi s, the rotating speed r (n +1) of the lower fan in the next operating period is equal to the rotating speed r (n) of the upper fan in the previous operating period; the double-air-duct air conditioner detects the indoor environment temperature Tin, the indoor relative humidity phi and the temperature Te _ down of the lower evaporator 4 once per T2 running time in an ultralow sensible heat high latent heat load area dehumidification mode, automatically corrects according to an indoor environment temperature-indoor relative humidity-dew point temperature comparison table in the system to obtain a new dew point temperature TL, calculates delta T, and then confirms the new rotating speed of the lower fan.

It should be noted that the rule for obtaining the dew point temperature TL is: if the detected indoor environment temperature is a non-integer, taking the integer after the current indoor environment temperature is plus 0.5 ℃ as the indoor environment temperature of the indoor environment temperature-indoor relative humidity-dew point temperature comparison table, and if the detected indoor relative humidity is a non-integer, taking the integer multiple of 5% after the current indoor relative humidity is plus 2.5% as the indoor relative humidity of the indoor environment temperature-indoor relative humidity-dew point temperature comparison table. See in particular table 1 below:

indoor environment temperature-indoor relative humidity-dew point temperature comparison table (relative humidity unit%, indoor temperature, dew point temperature unit degree C.)

Further, as shown in fig. 3, an upper electric heater 11 is arranged on the upper air duct 1, a lower electric heater 12 is arranged on the lower air duct 2, and when the dual-air-duct air conditioner continuously operates in the dehumidification mode of the ultra-low sensible heat and high latent heat load area, if the target temperature difference E is less than or equal to a third preset temperature difference E3, one or both of the upper electric heater 11 and the lower electric heater 12 are turned on to generate heat, so as to offset the output of sensible heat (or cold) of the air conditioner, and prevent the indoor temperature from being lowered too low; wherein, E3 is less than or equal to-1 ℃.

Further, the frequency F of the compressor of the double-air-channel air conditioner is in positive and strong correlation with the target temperature difference E, and the larger the value of E is, the higher the frequency F is; when the double-air-channel air conditioner operates in the dehumidification mode of the ultralow sensible heat and high latent heat load area, the frequency F of the compressor of the double-air-channel air conditioner is Fmin at the minimum value and N1% of Fmax at the maximum value; when the double-air-channel air conditioner operates in a dehumidification mode of a low-sensible-heat high-latent-heat load area, the frequency F of a compressor of the double-air-channel air conditioner is Fmin at the minimum value and N2% of Fmax at the maximum value; wherein N1 is more than N2 and less than or equal to 50, N1 percent Fmax and N2 percent Fmax both belong to the low-frequency interval of the compressor, Fmin is the minimum frequency of reliable operation of the compressor, and Fmax is the maximum frequency of reliable operation of the compressor.

The following describes the dehumidification method of the dual duct air conditioner in detail by using two examples:

example one:

when the air conditioner refrigerates and automatically runs at the wind speed or in a dehumidifying mode, all parameters are set as follows: Δ R is 5rpm, Δ R is 10rpm, T1 is 10 ℃, T2 is 5 ℃, E1 is 0.5 ℃, E2 is 3 ℃, the lowest rotation speed of reliable operation of the lower fan is 100rpm, the lowest rotation speed of reliable operation of the upper fan is 50rpm, Φ 1 is 80%, Φ 2 is 20%, Te2 is 5 ℃, Te1 is 0 ℃, T1 is 10min, T2 is 5min, Tout1 is 30 ℃, N2 is 50, and Fmax is 80 Hz. The indoor ambient temperature Tin is 30 ℃, the indoor relative humidity phi is 92%, and the outdoor ambient temperature is 35 ℃. The target temperature Ts is 25 ℃ and the target relative humidity φ s is 50% (if the relative humidity cannot be set, the default is 65%), and when the target temperature difference E is Tin-Ts 30 ℃ -25 ℃ 5 ℃ > 3 ℃ (E2), φ 92% > 80% (φ 1), Tout 35 ℃ > 30 ℃ (Tout1) meets the definition of the medium and high sensible heat load region, the dehumidification mode of the medium and high sensible heat load region is entered. Indoor set: the gears of the upper fan and the lower fan are controlled to be synchronous, and the initial rotating speed can be automatic wind or low wind and is determined by a specific manufacturer.

After a plurality of minutes, detecting the indoor environment temperature Tin to be 26 ℃, the indoor relative humidity phi to be 75%, wherein the target temperature difference E to Tin-Ts to be 26-25 ℃, 1 ℃ and less than 3 ℃ (E2) and more than 0.5 ℃ (E1), phi to phi s to be 75-50%, 25% and more than 20% (phi 2), and according to the definition of the low-sensible-heat high-latent-heat load area, entering the dehumidification mode of the low-sensible-heat high-latent-heat load area. Indoor set: and controlling the gears of the upper fan and the lower fan to be forcibly switched to a low-wind gear, wherein after 5min, the indoor environment temperature Tin is 25.5 ℃, the indoor relative humidity phi is 72%, and the system automatically corrects the dew point temperature TL obtained in the table 1 above to be 21 ℃. Controlling the rotation speed of an upper fan to be constant if the temperature Te _ up of the upper evaporator 3 is 17 ℃, the temperature Delta T is 4 ℃ < 5 ℃ (T2), controlling the rotation speed of the upper fan to be-5 rpm, and if the temperature Te _ up of the upper evaporator 3 is 13 ℃, the temperature Delta T (TL-Te _ up ═ 21-13) > 8 ℃ and < 10 ℃ (T1), and controlling the rotation speed of the upper fan to be constant, if the temperature Te _ up of the upper evaporator 3 is 9 ℃, the temperature Delta T is 12 ℃ > 10 ℃ (T1), controlling the rotation speed of the upper fan to be +5rpm, and controlling the detection period of whether the rotation speed of the upper fan changes to be 5 min; if the temperature Te _ down of the lower evaporator 4 is 18 ℃, Δ T is 3 ℃ < 5 ℃ (T2), the lower fan speed is controlled at-10 rpm, if the temperature Te _ down of the lower evaporator 4 is 12 ℃, Δ T (Δ T TL-Te _ down is 21-12) > 9 ℃ and < 10 ℃ (T1) is controlled to be constant, if the temperature Te _ down of the lower evaporator 4 is 7 ℃, Δ T is 14 ℃ > 10 ℃ (T1), the lower fan speed +10rpm is controlled, and the detection period of whether the lower fan is changed is 5 min;

an outdoor unit: the highest frequency of the compressor in the dehumidification mode of the middle and high sensible heat load areas is 80Hz, and the highest frequency of the compressor in the dehumidification mode of the low sensible heat and high latent heat load areas is 50 percent multiplied by 80 to 40 Hz.

Example two

When the air conditioner refrigerates and runs at the automatic wind speed or in a dehumidifying mode, the room temperature Tin is as follows: 25.5 ℃, 85% relative humidity, 25% temperature Ts, 55% relative humidity, 55% (default 65% if relative humidity cannot be set) Te1 ═ 0 ℃, Te2 ═ 5 ℃, N1 ═ 25, E3 ═ 2 ℃, and the other parameters set up as in example 1. And at the moment, the target temperature difference E is 25.5-Ts, 0.5-0.5 ℃ (E1), phi-phi s is 85-60% and more than 10% (phi 2), and the dehumidification mode enters the ultra-low sensible heat high latent heat load area if the definition of the ultra-low sensible heat high latent heat load area is met. Indoor set: controlling the upper fan to run at the lowest rotating speed of 50rpm which can run reliably; the lower fan is controlled to operate at a minimum speed of 100rpm for reliable operation. Detecting after 10min, and if the detected temperature Te _ up of the upper evaporator 3 is more than 0 ℃ (Te1) and less than 5 ℃ (Te2), controlling the rotating speed of the upper fan to be kept unchanged, namely the rotating speed R of the upper fan is 50 rpm; when the temperature Te _ up of the upper evaporator 3 is-1 ℃ < 0 ℃ (Te1), the upper fan speed is controlled to +5rpm, i.e., the upper fan speed R (n +1) ═ R (n) + Δ R ═ 100+5 ═ 105 rpm; detecting after 10min, if the detected temperature Te _ down of the lower evaporator 4 is 2 ℃ > 0 ℃ (Te1) and < 5 ℃ (Te2), controlling the lower fan rotating speed to be kept unchanged, namely the lower fan rotating speed r is 100 rpm; when the temperature Te _ down of the lower evaporator 4 is-1 ℃ < 0 ℃ (Te1), the lower fan is controlled at +10rpm, i.e., the lower fan rotation speed r (n +1) ═ r (n) +tanr ═ 100+10 ═ 110 rpm. The detection period for detecting whether the rotating speeds of the upper fan and the lower fan are changed is 5 min.

After several minutes, the indoor ambient temperature Tin is 23.5 ℃, the relative humidity phi is 75%, and at this time, the target temperature difference E ═ Tin-Ts is 22.5 ℃ -25 ℃ - & lt-2.5 ℃ & gt (E3), one or both of the upper electric heater 11 and the lower electric heater 12 are controlled to be turned on, so as to counteract the reduction of the room temperature.

An outdoor unit: the highest frequency of the compressor in the dehumidification mode of the ultra-low sensible heat and high latent heat load region is 25%. 80 ═ 20 Hz.

Based on the dehumidification method of the dual-duct air conditioner, the embodiment of the invention also provides a dehumidification system of the dual-duct air conditioner, which comprises an acquisition module 201, a judgment module 202 and a control module 203, as shown in fig. 5.

The obtaining module 201 is configured to obtain a target temperature Ts and a target relative humidity φ s set by a user, and obtain an indoor environment temperature Tin, an outdoor environment temperature Tout, and an indoor relative humidity φ in real time.

The judging module 202 is configured to judge whether the dual-air-channel air conditioner meets a first parameter condition required for entering a dehumidification mode of an ultra-low sensible heat and high latent heat load area, judge whether the dual-air-channel air conditioner meets a second parameter condition required for entering the dehumidification mode of a low sensible heat and high latent heat load area, and judge whether the dual-air-channel air conditioner meets a third parameter condition required for entering a middle sensible heat and high sensible heat load area mode; the first parameter condition is that the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is smaller than or equal to a first preset temperature difference E1, and meanwhile, the indoor relative humidity phi is larger than or equal to a first preset relative humidity phi 1 or the difference value delta phi between the indoor relative humidity phi and the target relative humidity phi s is larger than or equal to a preset relative humidity difference phi 2; the second parameter condition is that the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a first preset temperature difference E1 and less than or equal to a second preset temperature difference E2, and meanwhile, the indoor relative humidity phi is greater than or equal to a preset relative humidity phi 1 or the difference value delta phi between the indoor relative humidity phi and the target relative humidity phi s is greater than or equal to a preset relative humidity difference phi 2; the third parameter condition is that the target temperature difference E between the target temperature Ts and the indoor environment temperature Tin is greater than a second preset temperature difference E2, and the outdoor environment temperature Tout is greater than or equal to the outdoor preset temperature Tout 1; wherein E2 is more than or equal to 3 ℃ and E1 is more than or equal to-1 ℃, Tout1 is more than or equal to 24 ℃, 100 percent is more than or equal to phi 1 and more than or equal to 70 percent, and 50 percent is more than or equal to phi 2 and more than or equal to 10 percent.

The control module 203 is configured to control the compressor of the dual-air-conditioner to operate at a low frequency and control the upper fan and the lower fan to operate at a lowest rotational speed at which the fans operate reliably when it is determined that the dual-air-conditioner needs to enter a dehumidification mode in an ultra-low sensible heat and high latent heat load region; the system comprises a double-air-channel air conditioner, an upper fan, a lower fan, a control module and a control module, wherein the double-air-channel air conditioner is used for controlling the compressor of the double-air-channel air conditioner to operate at low frequency and controlling the upper fan and the lower fan to operate at a low wind gear when judging that the double-air-channel air conditioner needs to enter a dehumidification mode of a low sensible heat and; and the air conditioner is used for controlling the upper fan and the lower fan to operate at a wind speed gear set by a user when the double-air-channel air conditioner is judged to need to enter a mode of a middle and high sensible heat load area.

Therefore, by adopting the dehumidification system of the dual-air-channel air conditioner provided by the embodiment of the invention, the target temperature Ts and the target relative humidity φ s set by a user are acquired through the acquisition module 201, the indoor ambient temperature Tin, the outdoor ambient temperature Tout and the indoor relative humidity φ are acquired in real time, the judgment module 202 judges whether the air conditioner meets the parameter conditions of entering the dehumidification mode of the ultra-low sensible heat high latent heat load region, the dehumidification mode of the low sensible heat high latent heat load region and the dehumidification mode of the medium and high sensible heat load regions, the control module 203 controls the rotating speeds of the upper fan and the lower fan in a certain dehumidification mode to change the sensible heat component and the latent heat component of the air conditioner, so that the dehumidification mode of the ultra-low sensible heat high latent heat load region, the dehumidification mode of the low sensible heat high latent heat load region and the dehumidification mode of the medium and high sensible heat load region can be switched with each other, and the coverage area of the, especially when the double-air-duct air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area, the upper fan and the lower fan are controlled to operate at the lowest rotating speed at which the fans operate reliably, the evaporation temperature of a steam generator is greatly reduced, the dehumidification capacity of the air conditioner is improved, the latent heat output of the compressor during low-frequency operation is further improved, the sensible heat output is reduced, constant-temperature dehumidification is realized, the normal dehumidification of the air conditioner in the ultralow sensible heat and high latent heat load area is effectively ensured, the room temperature is not reduced or slightly reduced, the air conditioner is adaptive to the room load of more time periods in a refrigeration season, and the comfortable requirement of users can be controlled by the temperature and the humidity.

Based on the above embodiment, in order to adapt to the temperature change of the evaporator and make the dehumidification capability of the air conditioner more reliable and energy-saving in consideration of the influence of the rotating speed of the indoor fan on the temperature of the evaporator, the following functions are added to the settings of the acquisition module 201, the judgment module 202 and the control module 203:

in the operation process of the dual-air-duct air conditioner in a dehumidification mode of an ultralow sensible heat and high latent heat load area, in order to realize the control of the rotating speed R of the upper fan and the rotating speed R of the lower fan, the acquisition module 201 is further used for acquiring the temperature Te _ up of the upper evaporator 3, the temperature Te _ down of the lower evaporator 4 and the dew point temperature TL in real time. The judging module 202 is further configured to judge whether the upper fan meets a fourth parameter condition required for keeping the rotation speed unchanged, judge whether the upper fan meets a fifth parameter condition required for reducing the rotation speed, judge whether the upper fan meets a sixth parameter condition required for increasing the rotation speed, judge whether the lower fan meets a seventh parameter condition required for keeping the rotation speed unchanged, and judge whether the lower fan meets an eighth parameter condition required for increasing the rotation speed; the fourth parameter condition is that after the dual-air-duct air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is less than or equal to the target relative humidity phi s, or the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator 3 is within a preset threshold range, namely, the difference delta T is greater than or equal to T2 and less than or equal to T1; the fifth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator 3 is less than T2; the sixth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator 3 is greater than T1; the seventh parameter condition is that the temperature Te _ down of the lower evaporator 4 is in a preset threshold range after the double-air-channel air conditioner operates for t1 time period in a dehumidification mode of an ultralow sensible heat and high latent heat load area, namely Te2 is more than Te _ down is more than Te 1; the seventh parameter condition is that the temperature Te _ down of the lower evaporator 4 is less than or equal to Te1 after the double-air-channel air conditioner operates for t1 time period in a dehumidification mode of a low sensible heat and high latent heat load area. The control module 203 is further configured to control the rotation speed of the upper fan to remain unchanged when the parameter condition is determined to be the fourth parameter condition, control the rotation speed of the upper fan to decrease by Δ R when the parameter condition is determined to be the fifth parameter condition, control the rotation speed of the upper fan to increase by Δ R when the parameter condition is determined to be the sixth parameter condition, control the rotation speed of the lower fan to remain unchanged when the parameter condition is determined to be the seventh parameter condition, and control the rotation speed of the lower fan to increase by Δ R when the parameter condition is determined to be the eighth parameter condition.

In the operation process of the dual-air-duct air conditioner in a dehumidification mode of a low sensible heat and high latent heat load area, in order to realize the control of the rotating speed R of the upper fan and the rotating speed R of the lower fan, the acquisition module 201 is further used for acquiring the temperature Te _ up of the upper evaporator 3, the temperature Te _ down of the lower evaporator 4 and the dew point temperature TL in real time. The determining module 202 is further configured to determine whether the upper fan meets a fourth parameter condition required for maintaining the rotation speed unchanged, determine whether the upper fan meets a fifth parameter condition required for reducing the rotation speed, determine whether the upper fan meets a sixth parameter condition required for increasing the rotation speed, determine whether the lower fan meets a seventh parameter condition required for maintaining the rotation speed unchanged, determine whether the lower fan meets an eighth parameter condition required for reducing the rotation speed, and determine whether the lower fan meets a ninth parameter condition required for increasing the rotation speed; the fourth parameter condition is that after the dual-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for T1 time period, the indoor relative humidity phi is less than or equal to a target relative humidity phi s, or the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator 3 is within a preset threshold range, namely, the difference delta T is greater than or equal to T2 and less than or equal to T1; the fifth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator 3 is less than T2; the sixth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator 3 is greater than T1; the seventh parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is less than or equal to the target relative humidity phi s, or the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ down of the lower evaporator 4 is within a preset threshold range, namely, the delta T is more than or equal to T2 and less than or equal to T1; the eighth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew-point temperature TL and the temperature Te _ down of the lower evaporator 4 is less than T2; and the ninth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew-point temperature TL and the temperature Te _ down of the lower evaporator 4 is greater than T1. The control module 203 is further configured to control the rotation speed of the upper fan to remain unchanged when the parameter condition is determined to be the fourth parameter condition, control the rotation speed of the upper fan to decrease Δ R when the parameter condition is determined to be the fifth parameter condition, control the rotation speed of the upper fan to increase Δ R when the parameter condition is determined to be the sixth parameter condition, control the rotation speed of the lower fan to remain unchanged when the parameter condition is determined to be the seventh parameter condition, control the rotation speed of the lower fan to decrease Δ R when the parameter condition is determined to be the eighth parameter condition, and control the rotation speed of the lower fan to increase Δ R when the parameter condition is determined to be the ninth parameter condition.

Wherein the temperature is not less than 20 ℃ and not less than T1 and not less than T2 and not less than 0 ℃, T1 and not less than 0.5min, the temperature is not less than 5 ℃ and not less than Te2 and not less than Te1 and not less than-1 ℃, the delta R and not less than 1rpm, the upper limit value of R is the low wind gear rotating speed of the upper fan, the lower limit value of R is the lowest rotating speed of the upper fan in reliable operation, the upper limit value of R is the low wind gear rotating speed of the lower fan, and the lower limit value of R is the lowest rotating speed of the lower fan in reliable operation.

For example, in order to prevent the indoor temperature from being too low, the upper air duct 1 is provided with an upper electric heater 11, and the lower air duct 2 is provided with a lower electric heater 12. Accordingly, the settings of the judging module 202 and the control module 203 also have the following functions:

the judging module 202 is further configured to judge whether the upper electric heater 11 and the lower electric heater 12 meet a tenth parameter condition required for turning on; wherein the tenth parameter condition is that the target temperature difference E is less than or equal to a third preset temperature difference E3, and E3 is less than or equal to minus 1 ℃. The control module 203 is further configured to control one or both of the upper electric heater 11 and the lower electric heater 12 to be turned on when the parameter condition is determined to be the tenth parameter condition.

Based on the application of the dehumidification system of the double-air-duct air conditioner in the double-air-duct air conditioner, the embodiment of the invention provides the double-air-duct air conditioner, which comprises the dehumidification system of the double-air-duct air conditioner, and the double-air-duct air conditioner comprises the dehumidification system, so that all the beneficial effects of the dehumidification system are achieved, and the description is omitted.

As shown in fig. 3, the indoor unit of the dual air-conditioner further includes a humidity sensor for detecting indoor relative humidity, a first temperature sensor for detecting indoor ambient temperature, a second temperature sensor 5 for detecting temperature of the upper evaporator 3, and a third temperature sensor 6 for detecting temperature of the lower evaporator 4, wherein the humidity sensor, the first temperature sensor, the second temperature sensor 5, and the third temperature sensor 6 are electrically connected to the obtaining module 201 respectively; a separation plate 7 is arranged between the upper air duct 1 and the lower air duct 2 to prevent air from mixing between the two air ducts; the total inlet of the upper evaporator 3 and the total inlet of the lower evaporator 4 are respectively connected with a total flow divider 8, the upper evaporator 3 comprises 1 or more than 1 branch, and when the upper evaporator 3 consists of more than 1 branch, the branch inlet of the upper evaporator 3 is provided with an upper flow divider 9, and the second temperature sensor 5 is arranged at the middle position of one branch of the upper evaporator 3; the lower evaporator 4 comprises 1 or more than 1 branch, and when the lower evaporator 4 consists of more than 1 branch, a lower splitter 10 is arranged at the inlet of the branch of the lower evaporator 4, and the third temperature sensor 6 is arranged in the middle of one branch of the lower evaporator 4.

Illustratively, the upper fan is preferably a centrifugal fan which has the characteristics of long air supply distance and large noise; the lower fan is preferably a cross-flow fan which has the characteristics of short air supply distance and low noise.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A dehumidification method of a double-air-channel air conditioner is characterized in that an indoor unit of the double-air-channel air conditioner comprises an upper air channel and a lower air channel, wherein an upper fan and an upper evaporator are arranged on the upper air channel, and a lower fan and a lower evaporator are arranged on the lower air channel; the dehumidification method of the double-air-duct air conditioner comprises the following steps of:

2. The dehumidifying method of a dual air duct air conditioner as claimed in claim 1, wherein during the operation of the dual air duct air conditioner in the ultra low sensible heat and high latent heat load dehumidifying mode, the rotation speed R of the upper fan is varied according to a variation in the temperature Te _ up of the upper evaporator, and the rotation speed R of the lower fan is varied according to a variation in the temperature Te _ down of the lower evaporator;

the control of the rotating speed R of the upper fan is specifically as follows:

after the double-air-duct air conditioner operates in a dehumidification mode with ultralow sensible heat and high latent heat load area for a time period of t1, when the temperature Te _ up of the upper evaporator is within a preset threshold range, namely Te2 is more than Te _ up is more than Te1, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the previous operating period of the upper fan; when the temperature Te _ up of the upper evaporator is not more than Te1, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the last operating period of the upper fan, and the rotating speed Delta R of a preset gear of the upper fan is increased;

the double-air-duct air conditioner detects the temperature Te _ up of the upper evaporator once per t2 running time in a dehumidification mode of an ultralow sensible heat and high latent heat load area, and further continuously confirms the rotating speed of a new lower fan;

the control of the rotating speed r of the lower fan is specifically as follows:

after the double-air-duct air conditioner operates in a dehumidification mode with ultralow sensible heat and high latent heat load area for a time period of t1, when the temperature Te _ down of the lower evaporator is in a preset threshold range, namely Te2 is more than Te _ down which is more than Te1, the rotating speed r (n +1) of the next operating period of the lower fan is equal to the rotating speed r (n) of the last operating period of the lower fan; when the temperature Te _ down of the lower evaporator is less than or equal to Te1, the rotating speed r (n +1) of the lower fan in the next operating period is equal to the rotating speed r (n) of the lower fan in the last operating period, and the rotating speed deltar of the upper fan in a preset gear is increased;

the double-air-duct air conditioner detects the temperature Te _ down of the lower evaporator once per t2 running time in a dehumidification mode of an ultralow sensible heat and high latent heat load area, and further continuously confirms the rotating speed of a new lower fan;

3. The dehumidifying method of a dual duct air conditioner as claimed in claim 1, wherein during the dual duct air conditioner operates in a low sensible heat and high latent heat load dehumidifying mode, a rotation speed R of the upper fan is varied according to a variation in a difference Δ T between a dew point temperature TL and a temperature Te _ up of the upper evaporator, and a rotation speed R of the lower fan is varied according to a variation in a difference Δ T between the dew point temperature TL and a temperature Te _ down of the lower evaporator;

after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, when the indoor relative humidity phi is larger than the target relative humidity phi s, if delta T is within a preset threshold range, namely T2 is not less than delta T is not less than T1, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the previous operating period of the upper fan; if Δ T is less than T2, the rotation speed R (n +1) of the upper fan in the next operation period is equal to the rotation speed R (n) of the upper fan in the previous operation period minus a preset gear rotation speed Δ R of the upper fan; if Δ T > T1, the rotation speed R (n +1) of the upper fan in the next operation period is equal to the rotation speed R (n) of the upper fan in the previous operation period, and the rotation speed of the upper fan at a preset gear is increased by Δ R; when the indoor relative humidity phi is less than or equal to the target relative humidity phi s, the rotating speed R (n +1) of the next operating period of the upper fan is equal to the rotating speed R (n) of the last operating period of the upper fan;

the double-air-duct air conditioner detects the indoor environment temperature Tin, the indoor relative humidity phi and the temperature Te _ up of the upper evaporator once per T2 running time in an ultra-low sensible heat high latent heat load area dehumidification mode, automatically corrects according to an indoor environment temperature-indoor relative humidity-dew point temperature comparison table in the system to obtain a new dew point temperature TL, calculates delta T and further confirms the new rotating speed of the upper fan;

after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, when the indoor relative humidity phi is larger than the target relative humidity phi s, if delta T is within a preset threshold range, namely, the T2 is not less than delta T is not less than T1, the rotating speed r (n +1) of the lower operating period of the lower fan is equal to the rotating speed r (n) of the upper fan in the previous operating period; if delta T is less than T2, the rotating speed r (n +1) of the next operating period of the upper fan is equal to the rotating speed r (n) of the last operating period of the upper fan minus a preset gear rotating speed delta r of the upper fan; if Δ T > T1, the rotation speed r (n +1) of the upper fan in the next operation period is equal to the rotation speed r (n) of the upper fan in the previous operation period, and the rotation speed of the upper fan at a preset gear is increased by Δ r; when the indoor relative humidity phi is less than or equal to the target relative humidity phi s, the rotating speed r (n +1) of the lower fan in the next operating period is equal to the rotating speed r (n) of the upper fan in the previous operating period;

the double-air-duct air conditioner detects the indoor environment temperature Tin, the indoor relative humidity phi and the temperature Te _ down of the lower evaporator once per T2 running time in an ultralow sensible heat high latent heat load area dehumidification mode, automatically corrects according to an indoor environment temperature-indoor relative humidity-dew point temperature comparison table in the system to obtain a new dew point temperature TL, calculates delta T and further confirms the new rotating speed of the lower fan;

4. The dehumidifying method of a dual air duct air conditioner as claimed in any one of claims 1 to 3, wherein an upper electric heater is provided on the upper air duct, and a lower electric heater is provided on the lower air duct, and one or both of the upper electric heater and the lower electric heater are turned on if a target temperature difference E is less than or equal to a third preset temperature difference E3 during the continuous operation of the dual air duct air conditioner in the ultra-low sensible heat high latent heat load zone dehumidifying mode, wherein E3 is less than or equal to-1 ℃.

5. The dehumidification method of a double-air-duct air conditioner as claimed in claim 1, wherein the frequency F of the compressor of the double-air-duct air conditioner is in positive and strong correlation with the target temperature difference E, and the larger the value of E, the higher F; when the double-air-channel air conditioner operates in the dehumidification mode of the ultralow sensible heat and high latent heat load area, the frequency F of the compressor of the double-air-channel air conditioner is Fmin at the minimum value and N1% of Fmax at the maximum value; when the double-air-channel air conditioner operates in a dehumidification mode of a low-sensible-heat high-latent-heat load area, the frequency F of a compressor of the double-air-channel air conditioner is Fmin at the minimum value and N2% of Fmax at the maximum value; wherein N1 is more than N2 and less than or equal to 50, N1 percent Fmax and N2 percent Fmax both belong to the low-frequency interval of the compressor, Fmin is the minimum frequency of reliable operation of the compressor, and Fmax is the maximum frequency of reliable operation of the compressor.

6. A dehumidification system of a double-air-channel air conditioner is characterized in that an indoor unit of the double-air-channel air conditioner comprises an upper air channel and a lower air channel, wherein an upper fan and an upper evaporator are arranged on the upper air channel, and a lower fan and a lower evaporator are arranged on the lower air channel; the dehumidification system of the double-air-duct air conditioner comprises:

7. The dehumidification system of a dual air conditioner according to claim 6,

the acquisition module is also used for acquiring the temperature Te _ up of the upper evaporator, the temperature Te _ down of the lower evaporator and the dew point temperature TL in real time;

the judging module is further used for judging whether the upper fan meets a fourth parameter condition required for keeping the rotating speed unchanged, judging whether the upper fan meets a fifth parameter condition required for reducing the rotating speed, judging whether the upper fan meets a sixth parameter condition required for increasing the rotating speed, judging whether the lower fan meets a seventh parameter condition required for keeping the rotating speed unchanged, and judging whether the lower fan meets an eighth parameter condition required for increasing the rotating speed; the fourth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is less than or equal to a target relative humidity phi s, or the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is within a preset threshold range, namely, the difference delta T is greater than or equal to T2 and less than or equal to T1; the fifth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is less than T2; the sixth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of an ultralow sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is greater than T1; the seventh parameter condition is that after the double-air-channel air conditioner operates for t1 time period in a dehumidification mode of an ultralow sensible heat and high latent heat load area, the temperature Te _ down of the lower evaporator is in a preset threshold range, namely Te2 is more than Te _ down is more than Te 1; the eighth parameter condition is that the temperature Te _ down of the lower evaporator is less than or equal to Te1 after the double-air-channel air conditioner operates for t1 time period in a dehumidification mode of a low sensible heat and high latent heat load area;

the control module is further used for controlling the rotating speed of the upper fan to keep unchanged when the parameter condition is judged to be a fourth parameter condition, controlling the rotating speed of the upper fan to reduce by delta R when the parameter condition is judged to be a fifth parameter condition, controlling the rotating speed of the upper fan to increase by delta R when the parameter condition is judged to be a sixth parameter condition, controlling the rotating speed of the lower fan to keep unchanged when the parameter condition is judged to be a seventh parameter condition, and controlling the rotating speed of the lower fan to increase by delta R when the parameter condition is judged to be an eighth parameter condition;

8. The dehumidification system of a dual air conditioner according to claim 6,

the judging module is further used for judging whether the upper fan meets a fourth parameter condition required for keeping the rotating speed unchanged, judging whether the upper fan meets a fifth parameter condition required for reducing the rotating speed, judging whether the upper fan meets a sixth parameter condition required for increasing the rotating speed, judging whether the lower fan meets a seventh parameter condition required for keeping the rotating speed unchanged, judging whether the lower fan meets an eighth parameter condition required for reducing the rotating speed, and judging whether the lower fan meets a ninth parameter condition required for increasing the rotating speed; the fourth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for T1 time period, the indoor relative humidity phi is less than or equal to a target relative humidity phi s, or the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is within a preset threshold range, namely, the difference delta T between the T2 and the T1 is greater than or equal to; the fifth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is less than T2; the sixth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ up of the upper evaporator is greater than T1; the seventh parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is less than or equal to the target relative humidity phi s, or the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference delta T between the dew point temperature TL and the temperature Te _ down of the lower evaporator is within a preset threshold range, namely, the delta T is more than or equal to T2 and less than or equal to T1; the eighth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew-point temperature TL and the temperature Te _ down of the lower evaporator is less than T2; the ninth parameter condition is that after the double-air-duct air conditioner operates in a dehumidification mode of a low sensible heat and high latent heat load area for a time period of T1, the indoor relative humidity phi is greater than the target relative humidity phi s, and the difference value delta T between the dew point temperature TL and the temperature Te _ down of the lower evaporator is greater than T1;

the control module is further used for controlling the rotating speed of the upper fan to keep unchanged when the parameter condition is judged to be a fourth parameter condition, controlling the rotating speed of the upper fan to reduce by delta R when the parameter condition is judged to be a fifth parameter condition, controlling the rotating speed of the upper fan to increase by delta R when the parameter condition is judged to be a sixth parameter condition, controlling the rotating speed of the lower fan to keep unchanged when the parameter condition is judged to be a seventh parameter condition, controlling the rotating speed of the lower fan to reduce by delta R when the parameter condition is judged to be an eighth parameter condition, and controlling the rotating speed of the lower fan to increase by delta R when the parameter condition is judged to be a ninth parameter condition;

9. The dehumidifying system of a dual air-conditioner according to any one of claims 6 to 8, wherein an upper electric heater is provided on the upper air duct, and a lower electric heater is provided on the lower air duct;

the judging module is further used for judging whether the upper electric heater and the lower electric heater meet a tenth parameter condition required by starting; wherein the tenth parameter condition is that the target temperature difference E is less than or equal to a third preset temperature difference E3, and E3 is less than or equal to minus 1 ℃;

the control module is further used for controlling one or two of the upper electric heater and the lower electric heater to be turned on when the parameter condition is judged to be the tenth parameter condition.

10. A double-air-duct air conditioner, characterized in that, it includes the dehumidification system of the double-air-duct air conditioner as claimed in claim 6 or 7, wherein, the indoor unit of the double-air-duct air conditioner further includes a humidity sensor for detecting indoor relative humidity, a first temperature sensor for detecting indoor ambient temperature, a second temperature sensor for detecting temperature of the upper evaporator, and a third temperature sensor for detecting temperature of the lower evaporator, the humidity sensor, the first temperature sensor, the second temperature sensor, and the third temperature sensor are respectively connected with the acquisition module, a separation plate is arranged between the upper air duct and the lower air duct, the total inlet of the upper evaporator and the total inlet of the lower evaporator are respectively connected with the total current divider, the upper evaporator includes 1 or more branches, and when the upper evaporator is composed of more than 1 branch, an upper shunt is arranged at a branch inlet of the upper evaporator, and the second temperature sensor is arranged in the middle of one branch of the upper evaporator; the lower evaporator comprises 1 or more than 1 branch, and when the lower evaporator consists of more than 1 branch, a lower splitter is arranged at the inlet of the branch of the lower evaporator, and the third temperature sensor is arranged in the middle of one branch of the lower evaporator.