A multifunctional all-in-one machine for passive house and control method thereof

Abstract

The present invention discloses a multifunctional all-in-one device for a passive house, comprising a device housing, on which a fresh air inlet, a fresh air outlet, an exhaust air inlet, an exhaust air outlet, and a circulating air inlet are provided. A first installation area, a second installation area, and a third installation area are provided from right to left within the device housing; the first installation area comprises a first installation module, a second installation module, and a third installation module, which are connected in sequence; wherein the first installation module is used to install a fan; the second installation module is used to install a heat exchange device; and the third installation module is used to install an air valve; and a bypass air duct is used to directly introduce fresh air into the fan. In the present invention, by providing a bypass air duct, outdoor cold air is directly introduced into the room through the bypass air duct to cool the room, without the need for additional refrigeration, thereby saving energy required for refrigeration equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of fresh air control, and specifically relates to a multifunctional all-in-one machine for a passive house and a control method thereof. Background Art

[0002] Passive houses are enclosed buildings that require air conditioning for cooling or heating to ensure that the interior of the entire building constitutes an independent space with a roughly constant temperature and humidity. In order to maintain the indoor temperature and humidity, ventilation cannot be achieved by opening windows, so a fresh air ventilator needs to be installed to achieve ventilation.

[0003] In the prior art, in order to achieve indoor temperature control, air conditioners or other devices are usually used to change the indoor temperature. However, when using these devices to control the temperature, a lot of energy is consumed. Therefore, a fresh air device that can reduce energy consumption is urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a multifunctional all-in-one machine for a passive house and a control method thereof, so as to solve the problem of excessive energy consumption caused by using air conditioners and other equipment to change the indoor temperature in the prior art proposed in the background art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A multifunctional all-in-one device for a passive house includes a device housing, a fresh air inlet, a fresh air outlet, an exhaust air inlet, an exhaust air outlet, and a circulating air inlet are provided on the device housing, and a first installation area, a second installation area, and a third installation area are provided inside the device housing from right to left; the first installation area, the second installation area, and the third installation area are sequentially connected;

[0007] The first installation area includes a first installation module, a second installation module, and a third installation module; wherein the first installation module is equipped with a fan; the second installation module is equipped with a heat exchange device; and the third installation module is equipped with an air valve; the air valve includes a fresh air valve and a bypass air valve;

[0008] The bypass air duct is used to directly introduce fresh air into the fan; the bypass air duct includes a first bypass air duct and a second bypass air duct, wherein the first bypass air duct is arranged inside the third installation module, and the second bypass air duct is arranged inside the second installation area, and one end of the second bypass air duct is connected to the first bypass air duct, and the other end is connected to the second installation module.

[0009] According to the above scheme, the fan includes a fresh air fan and an exhaust fan; wherein, one end of the fresh air fan is connected to the second installation module, and the other end of the fresh air fan is connected to the second installation area; one end of the exhaust fan is connected to the second installation module, and the other end of the exhaust fan is connected to the exhaust outlet.

[0010] According to the above solution, a filter and an evaporator are installed inside the second installation area; the filter includes a circulation filter and a fresh air filter, the circulation filter is connected to the circulation air inlet set outside the second installation area, and the fresh air filter is connected to the fresh air fan.

[0011] According to the above solution, a circulating air valve is further provided inside the circulating air inlet, and the circulating air inlet is controlled by opening or closing the circulating air valve.

[0012] According to the above solution, the fresh air filter includes a first filter and a second filter, and the first filter and the second filter are used to filter the introduced fresh air.

[0013] According to the above solution, an exhaust duct is further provided inside the third installation module, the exhaust duct is used to connect the exhaust inlet and the second installation module, and the exhaust duct and the first bypass duct are arranged vertically alternately.

[0014] According to the above solution, an electric heating device is further provided on the third installation module, and the electric heating device is used to heat the introduced fresh air.

[0015] According to the above solution, an air-conditioning fan is provided inside the third installation area, and the air-conditioning fan is connected to the fresh air outlet.

[0016] According to the above solution, the heat exchange device is a full heat exchange core, and a third filter is provided on the heat exchange device, and the third filter is used to filter the fresh air for heat exchange.

[0017] A control method for a multifunctional all-in-one machine includes the following steps: Step S1: selecting a system operation mode; if the cooling mode is selected, entering STEPA; if the heating mode is selected, entering STEPB; if the ventilation mode is selected, entering STEPC;

[0018] STEPA cooling mode:

[0019] Step A1: Open the circulating air valve and the air conditioning fan, and determine the air conditioning fan speed according to the indoor ambient temperature and the set temperature;

[0020] Step A2: Turn on the fresh air fan and fresh air valve, and control the wind speed of the fresh air fan according to the indoor CO2 and the relevant CO2 threshold;

[0021] Step A3: Control the opening or closing of the bypass vent valve according to the fresh air temperature and the indoor ambient temperature; when the bypass vent valve is open, outdoor air is directly introduced through the bypass vent valve to cool the indoor ambient temperature; when the bypass vent valve is closed, the fresh air is cooled through the evaporator;

[0022] Bypass air valve opening conditions: when the system is turned on and the fresh air temperature Tnw is less than the indoor ambient temperature Tr-1°C;

[0023] Bypass air valve closing conditions: system shutdown or when fresh air temperature Tnw> indoor ambient temperature Tr+1℃;

[0024] STEPB heating mode:

[0025] Step B1: Open the circulating air valve and the air conditioning fan, and determine the air conditioning fan speed according to the indoor ambient temperature and the set temperature;

[0026] Step B2: Turn on the fresh air fan and the fresh air valve, and control the wind speed of the fresh air fan according to the indoor CO2 and the relevant CO2 threshold;

[0027] Step B3: Open or close the bypass valve according to the fresh air temperature and the indoor ambient temperature; when the bypass valve is open, the outdoor air is directly introduced through the bypass valve to heat the room; when the bypass valve is closed, the introduced outdoor fresh air is heated by the electric heating device;

[0028] Bypass air valve opening condition: fresh air temperature Tnw> indoor ambient temperature Tr+1℃;

[0029] Bypass damper closing condition: fresh air temperature Tnw < indoor ambient temperature Tr-1℃;

[0030] STEPC ventilation mode:

[0031] Step C1: Open the fresh air valve and fresh air fan, and control the wind speed of the fresh air fan according to the indoor CO2 and the relevant CO2 threshold;

[0032] Step C2: Control the opening or closing of the bypass ventilator according to the fresh air temperature and the outdoor ambient temperature; when the bypass ventilator is open, the system enters the ventilation mode; when the bypass ventilator is closed, the system enters the cooling or heating mode according to the fresh air temperature and the indoor ambient temperature;

[0033] Bypass air valve opening condition: when 22℃≤fresh air temperature Tnw<26℃;

[0034] When the bypass damper is closed: when the fresh air temperature Tnw is less than 21℃, the system enters the heating mode; when the fresh air temperature Tnw is greater than 27℃, the system enters the cooling mode.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] In the present invention, a first installation area, a second installation area and a third installation area are provided, and a fan is installed inside the first installation area. The fan discharges the indoor air or introduces the outdoor air to change the indoor temperature. In addition, a heat exchange device is provided to exchange heat between the introduced cold air and the indoor hot air, thereby increasing the temperature of the wind, reducing the heating of the wind, and saving the energy required for heating.

[0037] And by setting up a bypass air duct, the outdoor cold air is directly introduced into the room through the bypass air duct to cool the room. No additional cooling is required, which saves the energy required for the refrigeration equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the heat exchange structure of the present invention;

[0039] Figure 2 This is a schematic diagram of the refrigeration structure of the present invention;

[0040] Figure 3 This is a schematic diagram of the circulating air structure of the present invention;

[0041] Figure 4 This is one of the system control schematics of the present invention;

[0042] Figure 5 The second schematic diagram of the system control of the present invention

[0043] Figure 6 This is the third schematic diagram of the system control of the present invention;

[0044] Figure 7 This is the fourth schematic diagram of the system control of the present invention.

[0045] Markings in the figure: 1-device casing, 2-fresh air inlet, 3-fresh air outlet, 4-exhaust inlet, 5-exhaust outlet, 6-circulating air inlet, 7-first installation area, 701-first installation module, 702-second installation module, 703-third installation module, 8-second installation area, 9-third installation area, 10-heat exchange device, 11-fresh air valve, 12-bypass air valve, 13-first bypass air duct, 14-second bypass air duct, 15-evaporator, 16-circulating filter, 17-fresh air filter, 18-circulating air valve, 19-first filter, 20-second filter, 21-exhaust duct, 22-electric heating device, 23-air conditioning fan, 24-fresh air fan, 25-exhaust fan, 26-third filter, 27-float switch, 28-lifting pump. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] Example 1

[0048] like Figure 1 and Figure 2 As shown, a multifunctional all-in-one device for a passive house includes a device housing 1, on which are disposed a fresh air inlet 2, a fresh air outlet 3, an exhaust air inlet 4, an exhaust air outlet 5, and a circulating air inlet 6. Inside the device housing 1, from right to left, a first installation area 7, a second installation area 8, and a third installation area 9 are disposed; the first installation area 7, the second installation area 8, and the third installation area 9 are sequentially connected;

[0049] The first installation area 7 includes a first installation module 701, a second installation module 702, and a third installation module 703, which are connected in sequence. The first installation module 701 is used to install a fan, which introduces or exhausts air. The second installation module 702 is used to install a heat exchange device 10, which is used to exchange heat with air. The third installation module 703 is used to install air valves. The air valves include a fresh air valve 11 and a bypass air valve 12. The fresh air valve 11 is connected to the fresh air inlet 2, and the bypass air valve 12 is connected to the bypass air duct.

[0050] The bypass air duct is used to directly introduce fresh air into the fan; the bypass air duct includes a first bypass air duct 13 and a second bypass air duct 14, wherein the first bypass air duct 13 is arranged inside the third installation module 703, and the second bypass air duct 14 is arranged inside the second installation area 8, and one end of the second bypass air duct 14 is connected to the first bypass air duct 13, and the other end is connected to the second installation module 702.

[0051] Furthermore, the bypass air duct is used to directly introduce fresh air into the fresh air blower 24.

[0052] Furthermore, the heat exchange device 10 adopts an existing device, such as a fluorine system heat exchanger.

[0053] In the present invention, a first installation area 7, a second installation area 8 and a third installation area 9 are provided, and a fan is installed inside the first installation area 7. The fan discharges the indoor air or introduces the outdoor air to change the indoor temperature. In addition, a heat exchange device 10 is provided to exchange heat between the introduced cold air and the indoor hot air, thereby increasing the temperature of the wind, reducing the heating of the wind, and saving the energy required for heating.

[0054] And by setting up a bypass air duct, the outdoor cold air is directly introduced into the room through the bypass air duct to cool the room. No additional cooling is required, which saves the energy required for the refrigeration equipment.

[0055] Example 2

[0056] This embodiment is a further refinement of the first embodiment. Figure 2 As shown, a filter and an evaporator 15 are installed inside the second installation area 8; the filter includes a circulation filter 16 and a fresh air filter 17, the circulation filter 16 is connected to the circulation air inlet 6 arranged outside the second installation area 8, and the fresh air filter 17 is connected to the fresh air blower 24; a circulation air valve 18 is also provided inside the circulation air inlet 6, and the circulation air inlet 6 is controlled by opening or closing the circulation air valve 18; the fresh air filter 17 includes a first filter 19 and a second filter 20, and the first filter 19 and the second filter 20 are used to filter the introduced fresh air; an exhaust duct 21 is also provided inside the third installation module 703, the exhaust duct 21 is used to connect the exhaust inlet 4 and the second installation module 702, and the exhaust duct 21 is connected to the first bypass The air ducts 13 are arranged in an upper and lower staggered manner; an electric heating device 22 is also provided on the third installation module 703, and the electric heating device 22 is used to heat the introduced fresh air; an air-conditioning fan 23 is provided inside the third installation area 9, and the air-conditioning fan 23 is connected to the fresh air outlet 3; the fan includes a fresh air fan 24 and an exhaust fan 25; wherein, one end of the fresh air fan 24 is connected to the second installation module 702, and the other end of the fresh air fan 24 is connected to the second installation area 8; one end of the exhaust fan 25 is connected to the second installation module 702, and the other end of the exhaust fan 25 is connected to the exhaust outlet 5; the heat exchange device 10 is a full heat exchange core; a third filter 26 is provided on the heat exchange device 10, and the third filter 26 is used to filter the fresh air for heat exchange.

[0057] Furthermore, a float switch 27 and a lift pump 28 are provided inside the device housing 1. The float switch 27 and the lift pump 28 are arranged inside the second installation area 8, wherein the float switch 27 is used to detect the accumulated water inside the second installation area 8. When the float switch 27 is triggered, the lift pump 28 is started to discharge the accumulated water in the second installation area 8 through the lift pump 28.

[0058] Furthermore, the float switch 27 and the lift pump 28 both adopt existing devices.

[0059] Furthermore, the electric heating device 22 adopts an existing device, such as resistance wire heating.

[0060] The working principle of the present invention is:

[0061] Usage mode 1: Figure 1As shown, when in use, open the fresh air valve 11, close the bypass air valve 12, and then start the fresh air fan 24 to introduce fresh air from the outside into the interior of the heat exchange device 10; then turn on the exhaust fan 25 to introduce the indoor hot air into the interior of the heat exchange device 10, realizing heat exchange between indoor air and outdoor fresh air, increasing the temperature of the outdoor fresh air, and eliminating the need to heat the outdoor fresh air through additional devices, thereby saving energy.

[0062] Usage mode 2: Figure 2 As shown, the bypass air valve 12 is opened to allow fresh air to enter the bypass air duct, and the outdoor fresh air is directly introduced into the fresh air fan 24 through the bypass air duct. After the outdoor fresh air is filtered, the outdoor fresh air is discharged into the room through the exhaust outlet 5 to cool the room. There is no need to cool the indoor air through additional devices, which saves energy.

[0063] Example 3

[0064] This embodiment is a further refinement of the second embodiment. In the present invention, in order to prevent the heat exchange device 10 from freezing due to the low outdoor temperature during use, the cold air blown into the heat exchange device 10 may condense inside the heat exchange device 10, causing the heat exchange device 10 to freeze and become ineffective.

[0065] Therefore, a temperature sensor and an electric heating device 22 are also provided on the third installation module 703 .

[0066] Among them, the temperature sensor is arranged inside the fresh air inlet 2 to detect the temperature of the fresh air entering the device; the electric heating device 22 is arranged on the side of the third installation module 703 to heat the introduced fresh air.

[0067] Example 4

[0068] like Figures 4 to 7 As shown, a control method for a multifunctional all-in-one machine includes the following steps: Step S1: selecting the operating mode of the system; if the cooling mode is selected, entering STEPA, if the heating mode is selected, entering STEPB, if the ventilation mode is selected, entering STEPC;

[0069] STEPA cooling mode:

[0070] Step A1: Open the circulating air valve 18 and the air conditioning fan 23, and determine the wind speed of the air conditioning fan 23 according to the indoor ambient temperature and the set temperature;

[0071] Step A2: Turn on the fresh air fan 24 and the fresh air valve 11, and control the wind speed of the fresh air fan 24 according to the indoor CO2 and the relevant CO2 threshold;

[0072] Step A3: Controlling the opening or closing of the bypass vent valve 12 according to the fresh air temperature and the indoor ambient temperature; when the bypass vent valve 12 is open, outdoor air is directly introduced through the bypass vent valve 12 to cool the indoor ambient temperature; when the bypass vent valve 12 is closed, the fresh air is cooled through the evaporator 15;

[0073] The bypass air valve 12 is opened when the system is turned on and the fresh air temperature Tnw is less than the indoor ambient temperature Tr-1°C.

[0074] Bypass air valve 12 closing conditions: system shutdown or when fresh air temperature Tnw> indoor ambient temperature Tr+1℃;

[0075] STEPB heating mode:

[0076] Step B1: Open the circulating air valve 18 and the air conditioning fan 23, and determine the wind speed of the air conditioning fan 23 according to the indoor ambient temperature and the set temperature;

[0077] Step B2: Turn on the fresh air fan 24 and the fresh air valve 11, and control the wind speed of the fresh air fan 24 according to the indoor CO2 and the relevant CO2 threshold;

[0078] Step B3: Open or close the bypass valve according to the fresh air temperature and the indoor ambient temperature; when the bypass valve is open, the outdoor air is directly introduced through the bypass valve to heat the room; when the bypass valve is closed, the introduced outdoor fresh air is heated by the electric heating device;

[0079] Bypass air damper open: fresh air temperature Tnw> indoor ambient temperature Tr+1℃;

[0080] Bypass damper closing condition: fresh air temperature Tnw < indoor ambient temperature Tr-1℃;

[0081] STEPC ventilation mode:

[0082] Step C1: Open the fresh air valve 11 and the fresh air fan 24, and control the wind speed of the fresh air fan 24 according to the indoor CO2 and the relevant CO2 threshold;

[0083] Step C2: Control the opening or closing of the bypass air valve 12 according to the fresh air temperature and the outdoor ambient temperature; when the bypass air valve 12 is open, the system enters the ventilation mode; when the bypass air valve 12 is closed, the system enters the cooling or heating mode according to the fresh air temperature and the indoor ambient temperature;

[0084] Opening condition of bypass air valve 12: when 22℃≤fresh air temperature Tnw<26℃;

[0085] When the bypass air valve 12 is closed: when the fresh air temperature Tnw is less than 21°C, the system enters the heating mode; when the fresh air temperature Tnw is greater than 27°C, the system enters the cooling mode.

[0086] Example 5

[0087] This embodiment provides a specific implementation of the cooling mode:

[0088] 1. Set the temperature range;

[0089] The setting range is 16℃-32℃, and the initial temperature is 26℃.

[0090] 2. Circulation air valve 18;

[0091] When the device enters the cooling mode, the circulating air valve 18 is opened, and when the device enters the ventilation mode or is shut down, the circulating air valve 18 is closed.

[0092] 3. Air conditioning fan 23 control;

[0093] The air conditioning fan 23 has three gears of operation: high, medium and low.

[0094] The wind speed of the air-conditioning fan 23 can be set in four modes: high, medium, low and automatic.

[0095] If the wind speed is selected as "automatic", the wind speed is determined according to the indoor ambient temperature Tr and the cooling mode set temperature Tsc, △T = Tr-Tsc.

[0096] When △T≥3℃, the wind speed is selected as high speed;

[0097] When 1℃<△T<3℃, the wind speed is selected as medium speed;

[0098] When △T<1℃, the wind speed is selected as low speed.

[0099] 4. Control of fresh air valve 11;

[0100] Open: After the equipment is turned on, the air valve opens.

[0101] Close: After the equipment is shut down, the air valve will close after a delay of 10 seconds.

[0102] 5. The fresh air fan 24 and the exhaust air fan 25 are put into control;

[0103] Operate according to indoor CO2 and relevant CO2 thresholds;

[0104] ΔC02 = indoor CO2 - CO2 threshold (e.g. 300 ppm);

[0105] When ΔC02>0, the fresh air fan 24 runs at high speed;

[0106] When 0≥ΔC02>-100; the fresh air fan 24 runs at medium speed;

[0107] When -100≥ΔC02>-200; the fresh air fan 24 runs at low speed;

[0108] Note: When the system is turned on, the fresh air fan 24 runs at the lowest low speed. When the system is turned off, the fresh air fan 24 is turned off.

[0109] 6. Control of bypass vent valve 12;

[0110] The bypass air valve 12 is opened when the system is turned on and the fresh air temperature Tnw is less than the indoor ambient temperature Tr-1°C.

[0111] Conditions for closing the bypass air valve 12: the system is shut down or when the fresh air temperature Tnw> indoor ambient temperature Tr+1℃.

[0112] 7. Control of electric heating device 22;

[0113] In the cooling mode, the electric heating device 22 is turned off.

[0114] 8. Lift pump 28;

[0115] Operation: After the equipment is turned on and reaches the starting water level, drain for 3 minutes;

[0116] Close: Close after 3 minutes.

[0117] 9. Dry and mildew-proof operation;

[0118] When the air conditioner is turned off, the indoor fan will continue to run at low speed for 3 minutes to dry out the moisture in the air-conditioned room.

[0119] 10. Indoor frost protection;

[0120] After entering the indoor anti-freeze protection, the indoor fan is forced to run at high speed. After exiting the inner disk anti-freeze protection, the indoor fan exits the forced high speed.

[0121] 11. When the outdoor coil temperature Toc>60℃ and lasts for 10s, it enters the cooling overload protection mode;

[0122] When the outdoor coil temperature Toc ≤ 58℃ and lasts for 20s, the cooling overload protection is exited and the fan speed returns to normal control.

[0123] When the outdoor unit has a shutdown fault, the outdoor unit will shut down. 30 seconds after the fault occurs, the power supply of the outdoor unit will be turned off, and the indoor fan will continue to run unchanged.

[0124] The fresh air and the exhaust air are exchanged with each other through the heat exchange core, and the energy is recovered and mixed with the internal circulation air to be cooled again through the evaporator 15.

[0125] Example 6

[0126] This embodiment provides a specific implementation of the heating mode:

[0127] 1. Set the temperature range;

[0128] The setting range is 16℃-32℃, and the initial temperature is 26℃.

[0129] 2. Circulation air valve 18 switch;

[0130] When the device enters the heating mode, the circulating air valve 18 is opened, and when it enters the ventilation mode or is shut down, the circulating air valve 18 is closed.

[0131] 3. Air conditioning fan 23 control;

[0132] The fan has three operating modes: high, medium and low;

[0133] The wind speed has four modes: high, medium, low and automatic;

[0134] If the wind speed is selected as "automatic", the wind speed is determined according to the indoor ambient temperature Tr and the heating mode set temperature Tsh, △T = Tsh-Tr.

[0135] When △T≥3℃, the wind speed is selected as high speed;

[0136] When 1℃<△T<3℃, the wind speed is selected as medium speed;

[0137] When 0℃<△T<1℃, the wind speed is selected as low speed.

[0138] When △T<0℃, the wind speed is selected as a light wind speed.

[0139] 4. Control of fresh air valve 11;

[0140] Open: After the equipment is turned on, the fresh air valve 11 is opened;

[0141] Close: After the equipment is shut down, the fresh air valve 11 is closed after a delay of 10 seconds.

[0142] 5. Indoor fresh air fan 24 is put into control;

[0143] Operate according to indoor CO2 and relevant CO2 thresholds;

[0144] ΔC02 = indoor CO2 - CO2 threshold (e.g. 300 ppm);

[0145] When ΔC02>0, the fresh air fan 24 runs at high speed;

[0146] When 0≥ΔC02>-100; the fresh air fan 24 runs at medium speed;

[0147] When -100≥ΔC02>-200, the fresh air fan 24 runs at low speed.

[0148] Note: When the system is turned on, the fresh air fan 24 runs at the lowest low speed. When the system is turned off, the fresh air fan 24 is turned off.

[0149] 6. Control of bypass vent valve 12;

[0150] The opening condition of the bypass air valve 12: the fresh air temperature Tnw> indoor ambient temperature Tr+1℃;

[0151] Conditions for closing the bypass air valve 12: fresh air temperature Tnw < indoor ambient temperature Tr-1℃.

[0152] 7. Anti-freeze electric auxiliary heating control;

[0153] Enable conditions;

[0154] System startup;

[0155] Fresh air temperature Tnw<-5℃;

[0156] When the above conditions are met at the same time, the electric heating can be turned on;

[0157] Closing conditions;

[0158] System shutdown;

[0159] Fresh air temperature Tnw>-3℃;

[0160] If any of the above conditions is met, it can be closed.

[0161] 8. Defrost control;

[0162] When the outdoor unit enters defrost mode, the indoor fan is turned off. When defrost is released, the unit enters the cold wind prevention mode.

[0163] 9. Anti-cold wind function;

[0164] a. Turn on the anti-cold wind function, the wind speed gradually increases, and the anti-cold wind function automatically exits after 3 minutes.

[0165] When the indoor coil temperature Tc is less than 26°C, the fan stops running;

[0166] 26℃<Indoor coil temperature Tc<32℃, fan runs at low speed;

[0167] 32℃<Indoor coil temperature Tc<38℃, fan runs at medium speed;

[0168] When the indoor coil temperature Tc is ≥38℃, the fan will run at the manually selected wind speed and the anti-cold wind function will be exited.

[0169] b. During the cold wind protection period, when the wind speed increases, the wind speed will no longer decrease even if the indoor coil temperature Tc decreases.

[0170] 10. Blowing away residual heat function;

[0171] When the compressor is turned off, the indoor fan determines its operating status according to the indoor coil to make full use of the waste heat in the indoor coil.

[0172] a. When the indoor coil temperature Tc is less than 30℃, the indoor fan stops immediately;

[0173] b. When the indoor coil temperature Tc ≥ 30℃, the fan will run at low speed for a maximum of 60 seconds;

[0174] 11. Heating inner disk protection.

[0175] 12. When the indoor and outdoor units have a shutdown fault, the outdoor unit will shut down, and the power supply of the outdoor unit will be turned off 30 seconds after the fault occurs.

[0176] The fresh air and exhaust air exchange energy through the heat exchange core, recover energy, and mix with the internal circulation air to heat up again through the evaporator 15. When the fresh air temperature is lower than -5℃, the electric heating is turned on for anti-freeze.

[0177] Example 7

[0178] This embodiment provides a specific implementation of the ventilation mode:

[0179] 1. If the outdoor unit is not turned on, the set temperature will be invalid.

[0180] 2. Air conditioning fan 23 control.

[0181] The wind speed can be set in four modes: high, medium, low and automatic wind;

[0182] When the automatic wind is set, the wind speed of the air conditioning fan 23 is the same as the wind speed of the fresh air fan 24.

[0183] 3. Fresh air valve 11 control;

[0184] Open: After the equipment is turned on, the air valve opens;

[0185] Close: After the equipment is shut down, the air valve will close after a delay of 10 seconds.

[0186] 4. Fresh air fan 24 is put into control;

[0187] Operate according to indoor CO2 and relevant CO2 thresholds;

[0188] ΔC02 = indoor CO2 - CO2 threshold (e.g. 300 ppm);

[0189] When ΔC02>0, the fresh air fan 24 runs at high speed;

[0190] When 0≥ΔC02>-100; the fresh air fan 24 runs at medium speed;

[0191] When -100≥ΔC02>-200, the fresh air fan 24 runs at low speed.

[0192] Note: When the system is turned on, the fresh air fan 24 runs at the lowest low speed. When the system is turned off, the fresh air fan 24 is turned off.

[0193] 5. Bypass vent valve 12 control;

[0194] Opening condition of bypass air valve 12: when 22℃≤fresh air temperature Tnw<26℃;

[0195] Conditions for closing the bypass air valve 12: when the fresh air temperature Tnw is less than 21°C or the fresh air temperature Tnw is greater than 27°C.

[0196] 6. When the outdoor unit fails to shut down, the air conditioner fan 23 does not shut down.

[0197] The energy of fresh air is recovered through the heat exchange core to ensure the comfort of the fresh air input into the room.

[0198] The indoor fans include: fresh air fan 24 and air conditioning fan 23.

[0199] Temperature definitions: indoor ambient temperature Tr, indoor coil temperature Tc, outdoor coil temperature Toc, cooling set temperature Tsc, indoor heating set temperature Tsh, and fresh air temperature Tnw.

[0200] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0201] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A multifunctional all-in-one device for a passive house, comprising a device housing (1), on which a fresh air inlet (2), a fresh air outlet (3), an exhaust air inlet (4), an exhaust air outlet (5) and a circulating air inlet (6) are provided, characterized in that: A first installation area (7), a second installation area (8), and a third installation area (9) are provided inside the device housing (1) from right to left; the first installation area (7), the second installation area (8), and the third installation area (9) are connected in sequence; The first installation area (7) includes a first installation module (701), a second installation module (702), and a third installation module (703); wherein a fan is installed in the first installation module (701); a heat exchange device (10) is installed in the second installation module (702); and an air valve is installed in the third installation module (703); the air valve includes a fresh air valve (11) and a bypass air valve (12); The bypass air duct includes a first bypass air duct (13) and a second bypass air duct (14), wherein the first bypass air duct (13) is arranged inside the third installation module (703), and the second bypass air duct (14) is arranged inside the second installation area (8), one end of the second bypass air duct (14) is connected to the first bypass air duct (13), and the other end is connected to the second installation module (702); an exhaust air duct (21) is also arranged inside the third installation module (703), and the exhaust air duct (21) and the first bypass air duct (13) are arranged in an upper and lower staggered manner. By providing a heat exchange device (10), the introduced cold air is exchanged with the indoor hot air, thereby increasing the temperature of the air and reducing the heating of the air.

2. The multifunctional all-in-one device for a passive house according to claim 1, characterized in that: The fan comprises a fresh air fan (24) and an exhaust air fan (25); wherein one end of the fresh air fan (24) is connected to the second installation module (702), and the other end of the fresh air fan (24) is connected to the second installation area (8); one end of the exhaust air fan (25) is connected to the second installation module (702), and the other end of the exhaust air fan (25) is connected to the exhaust outlet (5).

3. The multifunctional all-in-one device for a passive house according to claim 2, characterized in that: A filter and an evaporator (15) are installed inside the second installation area (8); the filter includes a circulation filter (16) and a fresh air filter (17); the circulation filter (16) is connected to a circulation air inlet (6) arranged outside the second installation area (8), and the fresh air filter (17) is connected to a fresh air fan (24).

4. The multifunctional all-in-one device for a passive house according to claim 3, characterized in that: A circulating air valve (18) is further provided inside the circulating air inlet (6), and the circulating air inlet (6) is controlled by opening or closing the circulating air valve (18).

5. The multifunctional all-in-one device for a passive house according to claim 3, characterized in that: The fresh air filter (17) comprises a first filter (19) and a second filter (20), and the first filter (19) and the second filter (20) are used to filter the introduced fresh air.

6. The multifunctional all-in-one device for a passive house according to claim 1, characterized in that: An electric heating device (22) is also provided on the third installation module (703). The electric heating device (22) is used to heat the introduced fresh air. The electric heating device (22) is activated when Tnw < -5°C and is used for antifreeze protection of the passive house during extreme low temperatures in winter.

7. The multifunctional all-in-one device for a passive house according to claim 1, characterized in that: An air conditioning fan (23) is provided inside the third installation area (9), and the air conditioning fan (23) is connected to the fresh air outlet (3).

8. The multifunctional all-in-one device for a passive house according to claim 1, characterized in that: The heat exchange device (10) is a full heat exchange core. A third filter (26) is provided on the heat exchange device (10). The third filter (26) is used to filter the fresh air for heat exchange.

9. A method for controlling a multifunctional device, characterized in that: The multifunction device according to any one of claims 1 to 8 is controlled, and the control method comprises the following steps: Step S1: Select the operating mode of the system; if the cooling mode is selected, enter STEPA; if the heating mode is selected, enter STEPB; if the ventilation mode is selected, enter STEPC; STEPA cooling mode: Step A1: Open the circulating air valve (18) and the air conditioning fan (23), and determine the wind speed of the air conditioning fan (23) according to the indoor ambient temperature and the set temperature; Step A2: turning on the fresh air fan (24) and the fresh air valve (11), and controlling the wind speed of the fresh air fan (24) according to the indoor CO2 and the relevant CO2 threshold; Step A3: controlling the opening or closing of the bypass ventilation valve (12) according to the fresh air temperature and the indoor ambient temperature; when the bypass ventilation valve (12) is opened, outdoor air is directly introduced through the bypass ventilation valve (12) to cool the indoor ambient temperature; when the bypass ventilation valve (12) is closed, the fresh air is cooled through the evaporator (15); The bypass air valve (12) opens when the system is turned on and the fresh air temperature Tnw is less than the indoor ambient temperature Tr-1°C. Bypass air valve (12) closing conditions: system shutdown or when fresh air temperature Tnw> indoor ambient temperature Tr+1℃; STEPB heating mode: Step B1: Open the circulating air valve (18) and the air conditioning fan (23), and determine the wind speed of the air conditioning fan (23) according to the indoor ambient temperature and the set temperature; Step B2: turning on the fresh air fan (24) and the fresh air valve (11), and controlling the wind speed of the fresh air fan (24) according to the indoor CO2 and the relevant CO2 threshold; Step B3: opening or closing the control according to the fresh air temperature and the indoor ambient temperature; when the bypass air valve (12) is opened, outdoor air is directly introduced through the bypass air valve (12) to heat the room; when the bypass air valve (12) is closed, the introduced outdoor fresh air is heated by the electric heating device; The opening condition of the bypass air valve (12): the fresh air temperature Tnw> indoor ambient temperature Tr+1℃; Bypass air valve (12) closing condition: fresh air temperature Tnw < indoor ambient temperature Tr-1℃; STEPC ventilation mode: Step C1: Open the fresh air valve (11) and the fresh air fan (24), and control the wind speed of the fresh air fan (24) according to the indoor CO2 and the relevant CO2 threshold; Step C2: Control the opening or closing of the bypass air valve (12) according to the fresh air temperature and the outdoor ambient temperature; when the bypass air valve (12) is opened, enter the ventilation mode; when the bypass air valve (12) is closed, enter the cooling or heating mode according to the fresh air temperature and the indoor ambient temperature; Opening condition of bypass air valve (12): when 22℃≤fresh air temperature Tnw<26℃; When the bypass air valve (12) is closed: when the fresh air temperature Tnw < 21°C, the system enters the heating mode; when the fresh air temperature Tnw > 27°C, the system enters the cooling mode.

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