A ventilation floor system and operation control method suitable for super low energy consumption residential buildings in cold regions

Abstract

A ventilated floor system and its operation control method for ultra-low energy consumption residential buildings in cold regions are disclosed. The system comprises a ventilation system and a radiant heated floor. The radiant heated floor includes, from bottom to top, an insulation layer, a middle layer, and a floor surface layer. The middle layer contains an electric heating film or hot water pipe and ventilation ducts. The ventilation system includes an air supply shaft, a fresh air supply system, an indoor return air system, and a return air shaft. The air supply outlet of the air supply shaft is connected to the ventilation ducts via the fresh air supply system. The ventilation ducts are connected to the return air shaft via fresh air exhaust valves installed on the return air shaft. The indoor return air system is connected to the ventilation ducts, and the ventilation ducts are connected to indoor exhaust vents. An indoor exhaust valve is installed on the ventilation duct connected to the indoor exhaust vents. A portion of the radiant heated floor at the air supply outlet of the air supply shaft serves as a preheating zone for the fresh air supply system during winter. This invention can fully utilize natural cold and heat sources to help reduce building energy consumption and improve user thermal comfort.

Description

Technical Field

[0001] This invention relates to a ventilated floor structure and its operation control method, belonging to the field of construction, specifically to a ventilated floor system and its operation control method suitable for ultra-low energy consumption residential buildings in cold regions. Background Technology

[0002] The construction of ultra-low energy buildings and the energy-saving retrofitting of existing buildings according to ultra-low energy building standards are of great significance for achieving energy conservation in the building sector. Currently, ultra-low energy building design codes impose high requirements on building insulation performance, thermal insulation performance, and airtightness, thus affecting the flexibility of building HVAC systems in regulating the indoor thermal environment. With the increasing intensity of temperature fluctuations in recent years, a series of problems have gradually emerged in ultra-low energy building HVAC systems. In summer, the highest temperatures and number of high-temperature days in many areas have repeatedly broken historical records, significantly increasing the load on summer air conditioning systems and significantly impacting the stability of power system operation; in addition, the lowest winter temperatures have also repeatedly broken historical records, putting pressure on the operation of heating systems.

[0003] Making full use of natural cold sources to assist the cooling system in reducing indoor temperature in summer and using natural heat sources to assist in maintaining indoor temperature in winter are of great significance for further reducing the operating energy consumption of HVAC systems in ultra-low energy buildings and improving the thermal comfort of users. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention proposes a ventilated floor system and its operation control method suitable for ultra-low energy consumption residential buildings in cold regions. This system and method can improve the flexibility of the building's HVAC system in regulating the indoor thermal environment through ventilation or operation control strategies without compromising the airtightness of the ultra-low energy consumption building. Furthermore, it utilizes air valves to switch between winter and summer ventilation modes, fully leveraging natural cold and heat sources to further reduce building energy consumption and improve user thermal comfort.

[0005] On one hand, a ventilated floor system suitable for ultra-low energy consumption residential buildings in cold regions includes a ventilation system and a radiant heating floor. The radiant heating floor includes an insulation layer, an intermediate layer, and a floor surface layer arranged from bottom to top. The intermediate layer is equipped with an electric heating film or hot water pipe and a ventilation duct. The ventilation system includes an air supply shaft, a fresh air supply system, an indoor return air system, and a return air shaft. The air supply outlet of the air supply shaft is connected to the ventilation duct through the fresh air supply system. The ventilation duct is connected to the return air shaft through a fresh air exhaust valve installed on the return air shaft. The indoor return air system is connected to the ventilation duct. The ventilation duct is connected to the indoor exhaust outlet. An indoor exhaust valve is installed on the ventilation duct connected to the indoor exhaust outlet. A portion of the radiant heating floor arranged at the air supply outlet of the air supply shaft serves as a fresh air preheating zone for heating the fresh air supply system in winter.

[0006] On the other hand, a ventilation operation control method suitable for ultra-low energy consumption residential buildings in cold regions is provided, the method comprising the following:

[0007] S1. Set monitoring parameters T a For the temperature of the air supply shaft, T i Indoor air temperature;

[0008] S2. In summer, the temperature is adjusted according to the air temperature inside the air supply shaft and the indoor air temperature. T a Less than or equal to T i At +5℃, open the fresh air supply valve and fresh air exhaust valve to 100% opening, close the indoor return air valve and indoor exhaust air valve, fully turn on the fresh air fan, and turn off the indoor return air fan. Air in the supply air shaft flows into the ventilation duct under the drive of the fresh air fan. T a Greater than T i At +5℃, all air valves are closed and all fans are turned off;

[0009] In winter, the fresh air preheating zone is adjusted according to the temperature of the ventilation shaft. T a When the temperature is below -10 ℃, the ventilated floor system operates only in indoor air circulation mode. At this time, the indoor return air valve and indoor exhaust air valve are open at night and not open during the day, the fresh air inlet valve and fresh air exhaust valve are closed, the indoor return air fan is open at night and closed during the day, and the fresh air fan is closed.

[0010] when T a When the temperature is above -10 ℃, the ventilation floor system operates in a mixed mode of indoor circulation and fresh air preheating. The indoor return air valve, fresh air supply valve and indoor exhaust air valve are opened, with the indoor return air valve opening at 80% and the fresh air supply valve opening at 20%. The fresh air exhaust air valve is closed, and both the fresh air fan and the indoor return air fan are turned on. At this time, the fresh air in the air supply shaft flows through the fresh air supply valve and is heated in the fresh air preheating zone. It then mixes with the indoor return air at the indoor return air valve and flows into the room through the indoor exhaust air outlet.

[0011] All air valves are electric air valves, and their opening degree is controlled by an electric air valve controller. The control signal of the electric air valve controller is a voltage signal of 0-10 V or a current signal of 4-20 mA.

[0012] The advantages of this invention compared to the prior art are:

[0013] 1. Ventilated floor systems can promptly transfer heat accumulated inside the building envelope during summer, providing auxiliary cooling. The ventilation structure can effectively transfer solar radiation heat absorbed by the floor during the day, reducing the daytime radiation temperature of the building envelope's inner surface. Simultaneously, it reduces the amount of heat released from the building envelope into the room at night, thus providing auxiliary cooling in summer and lowering air conditioning energy consumption.

[0014] 2. Ventilated floor systems can effectively utilize the daytime heat storage of the building envelope during winter to provide auxiliary heating. During the day, the building envelope of ultra-low energy buildings, especially the floor layer, absorbs a large amount of solar radiation heat. Flexibly extracting this heat helps to further reduce the building's nighttime heating energy consumption and increase the minimum nighttime air temperature.

[0015] 3. The ventilated floor system can preheat fresh air in winter, reducing energy consumption for preheating. Fresh air is crucial for the health of residents; however, preheating energy for fresh air accounts for a significant proportion of total building energy consumption in winter. Directly introducing outdoor fresh air can cause localized overcooling indoor areas, affecting thermal comfort. This patent utilizes the internal heat source of the floor layer in non-frequently occupied areas to preheat fresh air introduced into the room through ventilation shafts. Compared to outdoor air, the air temperature inside the ventilation shaft is slightly higher, and the airflow is less affected by unstable factors such as changes in outdoor wind pressure. Furthermore, this system eliminates the need for an additional fresh air preheating heat exchanger, further reducing energy consumption. It is suitable for use in extremely cold and frigid regions.

[0016] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments: Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the ventilation floor system of the present invention applicable to ultra-low energy consumption residential buildings in cold regions;

[0018] Figure 2 This is a schematic diagram of a radiant floor heating system using hot water pipes in the fresh air preheating zone;

[0019] Figure 3 This is a schematic diagram of a radiant floor heating system using hot water pipes in a non-preheated, conventional area.

[0020] Figure 4 This is a schematic diagram of a radiant floor heating system using an electric heating film;

[0021] Figure 5 This is a schematic diagram showing an indoor return air vent configured as a louvered vent;

[0022] Figure 6 This is a flowchart of the ventilation operation control method for the ventilation floor system of the present invention.

[0023] Among them, 1. Air supply shaft, 2. Fresh air system, 2-1. Fresh air filter, 2-2. Fresh air fan, 2-3. Fresh air supply valve, 3. Fresh air preheating zone, 3-2. Non-preheating conventional zone, 4. Indoor return air system, 4-1. Indoor return air filter, 4-2. Indoor return air fan, 4-3. Indoor return air valve, 5. Ventilation duct, 6. Return air shaft, 7. Fresh air exhaust valve, 8-1. Indoor exhaust valve, 8-2. Indoor exhaust outlet, 9. Indoor return air outlet, 10-1. Electric heating film, 10-2. Hot water pipe, 11. Floor surface layer, 12. Intermediate layer, 13. Insulation layer. Detailed Implementation

[0024] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. Unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art.

[0025] Combination Figures 1-5 The description states that a ventilated floor system suitable for ultra-low energy consumption residential buildings in cold regions includes a ventilation system and a radiant heating floor.

[0026] The radiant heating floor includes an insulation layer 13, an intermediate layer 12 and a floor surface layer 11 arranged from bottom to top. The intermediate layer is provided with an electric heating film 10-1 or a hot water pipe 10-2 and a ventilation pipe 5.

[0027] The ventilation system includes an air supply shaft 1, a fresh air supply system 2, an indoor return air system 4, and a return air shaft 6. The air supply outlet of the air supply shaft 1 is connected to the ventilation duct 5 through the fresh air supply system 2. The ventilation duct 5 is connected to the return air shaft 6 through a fresh air exhaust valve 7 installed on the return air shaft 6. The indoor return air system 4 is connected to the ventilation duct 5. The ventilation duct 5 is connected to the indoor exhaust outlet 8-2. An indoor exhaust valve 8-1 is installed on the ventilation duct 5 connected to the indoor exhaust outlet 8-2. A portion of the radiant floor heating arranged at the air supply outlet of the air supply shaft 1 serves as a fresh air preheating zone 3 for heating the fresh air supply system 2 in winter.

[0028] Figure 1 The dotted line area represents the fresh air preheating zone 3 of the radiant floor heating system. In this embodiment, the fresh air preheating zone 3 is located near the air intake shaft 1, and the heat source is provided by the hot water pipes 10-2 or the electric heating film 10-1 inside the floor layer. To improve the fresh air preheating effect, shorten the preheating section length, and not significantly affect the thermal comfort of the residents, the fresh air preheating zone 3 is located in an area where users do not frequently stay. The number of hot water pipes 10-2 arranged in the fresh air preheating zone 3 is greater than the number of hot water pipes 10-2 arranged in the rest of the radiant floor heating system, thus doubling the hot water pipe arrangement density. Figure 2 As shown (there are many 10-2 hot water pipes) and Figure 3The comparison shown (the number of hot water pipes 10-2 is relatively small), or the electric heating film power is twice that of a normal living area, such as... Figure 4 As shown.

[0029] Based on the above implementation scheme, the following examples will further illustrate the process.

[0030] Example 1: The insulation layer 13 in this example is an EPS insulation layer, which is readily available and has good insulation effect. In this example, the thickness of the insulation layer 13 can be 4cm.

[0031] Example 2: The intermediate layer 12 in this example is a cement mortar layer. The purpose of this design is to provide waterproofing and seepage resistance. In this example, the thickness of the intermediate layer 12 can be 8cm.

[0032] In this embodiment, the floor surface layer can be solid wood flooring or engineered wood flooring. The rest is the same as in Embodiment 1.

[0033] Example 3: This example comprehensively considers heat exchange effect and building structural load. Preferably, multiple ventilation ducts 5 are arranged, with the center distance between adjacent ventilation ducts 5 being 10-20cm. The ventilation ducts 5 are connected in parallel to enhance the heat exchange effect. The internal wind speed of a single ventilation duct 5 does not exceed 2.0m / s, and the ventilation ducts 5 are installed by pre-embedding. The rest is the same as in Example 1 or 2.

[0034] Example 4: In this example, the ventilation duct 5 is a plastic pipe, a metal square pipe, or a flat pipe specifically for floor ventilation. The diameter of the plastic round pipe does not exceed 2cm, and the wall thickness does not exceed 2mm. The metal square pipe is required to be corrosion-resistant, have high structural strength, and low density, and its diameter and wall thickness requirements are the same as those for the plastic round pipe. The rest is the same as any one of Examples 1-3.

[0035] Example 5: In this example, the ventilation pipe 5 is located in the upper middle part of the floor layer, 2-4 cm away from the floor surface. For hot water radiant heating floor, the vertical distance between the ventilation pipe 5 and the hot water pipe 10-2 is 2-4 cm; for radiant heating floor using electric heating film, the distance between the ventilation pipe 5 and the electric heating film 10-1 is 2-4 cm. The rest differs from any of Examples 1-4.

[0036] Example 6: In this example, a 4cm thick EPS insulation layer is laid on the indoor floor, using a pre-embedded arrangement. The cement mortar layer is 8cm thick. The hot water pipe 10-2 is 1.5cm away from the upper surface of the insulation layer 13, and the vertical distance between the hot water pipe 10-2 and the ventilation pipe 5 is 2.5cm. An 18mm thick solid wood floor is then laid on the upper surface of the cement mortar layer, thus completing the construction of a ventilated floor.

[0037] Example 7: The fresh air system defined in this example includes a fresh air filter 2-1, a fresh air fan 2-2, and a fresh air supply valve 2-3. The fresh air filter 2-1 is arranged at the air outlet and is connected to the fresh air fan 2-2. The fresh air supply valve 2-3 is installed on the ventilation duct 5 connected to the fresh air fan 2-2.

[0038] In this embodiment, the fresh air fan 2-2 is a duct axial flow fan, and the fresh air supply valve 2-3 is an electric valve. Its main function is to switch the operating conditions of the ventilation system between winter and summer. The other embodiments 1-6 are the same.

[0039] Example 8: The indoor return air system 4 defined in this example includes an indoor return air filter 4-1, an indoor return air fan 4-2, and an indoor return air valve 4-3. The indoor return air filter 4-1 is arranged at the return air inlet and is connected to the indoor return air fan 4-2. The indoor return air valve 4-3 is installed on the ventilation duct 5 connected to the indoor return air fan 4-2.

[0040] In this embodiment, the indoor return air fan 4-2 is a duct axial flow fan, and the indoor return air valve 4-3 is an electric damper. Its main function is to switch the operating conditions of the ventilation system between winter and summer. The other embodiments 1-7 are the same.

[0041] For the fans in Embodiments 7 and 8 above, the fan air volume (m³ / h) is selected according to the indoor space volume × air exchange rate, and the fan pressure is between 100-200 Pa. The fan operates at its rated power and is used in conjunction with the air valve to switch ventilation modes. In summer, the fresh air fan 2-2 is on, and the indoor return air fan 4-2 is off. In winter, in the indoor air circulation mode only, the indoor return air fan 4-2 is on at night, and the fresh air fan 2-2 is off; in the winter indoor circulation + fresh air preheating mode, both the indoor return air fan 4-2 and the fresh air fan 2-2 are on simultaneously.

[0042] Example 9: In this example, the indoor return air vent 9 is defined as a louvered vent, such as... Figure 5 As shown, this setup facilitates compatible use. If a filter is installed at the air vent, a removable flat-plate filter with a medium-efficiency particle size rating can be used.

[0043] Based on any embodiment or combination of the above-described ventilated floor system solutions, a ventilation operation control method suitable for ultra-low energy consumption residential buildings in cold regions is also provided, the method comprising:

[0044] S1. Set monitoring parameters T a Temperature of the air supply shaft ，T i Indoor air temperature;

[0045] S2. In summer, the temperature is adjusted according to the air temperature inside the air supply shaft 1 and the indoor air temperature. T a Less than or equal to T i At +5℃, open the fresh air supply valve 2-3 and the fresh air exhaust valve 7 to 100% opening, close the indoor return air valve 4-3 and the indoor exhaust valve 8-1, fully open the fresh air fan 2-2, and close the indoor return air fan 4-2. Air in the supply air shaft 1 flows into the ventilation duct 5 driven by the fresh air fan 2-2. T a Greater than T i At +5℃, all air valves are closed and all fans are turned off;

[0046] In winter, the fresh air preheating zone is adjusted according to the temperature of the ventilation shaft. T a When the temperature is below -10 ℃, the ventilated floor system operates only in indoor air circulation mode. At this time, the indoor return air valve 4-3 and the indoor exhaust air valve 8-1 are open at night and not open during the day. The fresh air inlet valve 2-3 and the fresh air exhaust valve 7 are closed. The indoor return air fan 4-2 is open at night and closed during the day. The fresh air fan 2-2 is closed. The indoor air flows through the ventilation duct 5 under the drive of the fan, extracting the solar radiation heat absorbed by the floor during the day and heating the indoor air.

[0047] when T a At temperatures above -10 ℃, the ventilated floor system operates in a mixed mode of indoor recirculation and fresh air preheating. The indoor return air valve 4-3, fresh air supply valve 2-3, and indoor exhaust valve 8-1 are open, with the indoor return air valve 4-3 opening to 80% and the fresh air supply valve 2-3 opening to 20%. The fresh air exhaust valve 7 is closed, and both the fresh air fan 2-2 and the indoor return air fan 4-2 are activated. At this time, the fresh air in the air supply shaft 1 flows through the fresh air supply valve 2-3, is heated in the fresh air preheating zone, mixes with the indoor return air at the indoor return air valve 4-3, and then flows into the room through the indoor exhaust vent 8-2. The valve sizes match the duct sizes, and all valves are equipped with check valves to restrict airflow direction.

[0048] In the above scheme, all the air valves are electric air valves, and their opening degree is controlled by an electric air valve controller. The control signal of the electric air valve controller is a voltage signal of 0-10V or a current signal of 4-20mA.

[0049] The effects of the above embodiments are as follows:

[0050] 1. Provide auxiliary cooling in summer. In summer, floor ventilation systems can use cooler underground air or air from the building's ventilation shafts to remove heat stored inside the building envelope, reducing the surface temperature of the building envelope and ultimately helping to reduce the energy consumption of air conditioning in summer.

[0051] 2. Enables preheating of fresh air and auxiliary heating in winter. In winter, the floor ventilation system can preheat fresh air. Furthermore...

[0052] The solar radiation heat energy absorbed by the building envelope during the day can be used to heat the indoor air by running the ventilation system at night, thereby increasing the indoor air temperature at night and minimizing nighttime heating energy consumption.

[0053] The present invention has been disclosed above with reference to preferred embodiments; however, it is not intended to limit the invention. Any person skilled in the art can make modifications based on the disclosed structure and technical content without departing from the scope of the present invention.

[0054] Any modifications or alterations to the present invention that result in equivalent implementations are still within the scope of the present invention.

Claims

1. A ventilated floor system suitable for ultra-low energy consumption residential buildings in cold regions, characterized in that: Includes ventilation systems and radiant floor heating; The radiant heating floor includes an insulation layer (13), an intermediate layer (12) and a floor surface layer (11) arranged from bottom to top. The intermediate layer is provided with an electric heating film (10-1) or a hot water pipe (10-2) and a ventilation pipe (5). The ventilation system includes an air supply shaft (1), a fresh air supply system (2), an indoor return air system (4), and a return air shaft (6). The air supply outlet of the air supply shaft (1) is connected to the ventilation duct (5) through the fresh air supply system (2). The ventilation duct (5) is connected to the return air shaft (6) through a fresh air exhaust valve (7) installed on the return air shaft (6). The indoor return air system (4) is connected to the ventilation duct (5). The ventilation duct (5) is connected to the indoor exhaust outlet (8-2). An indoor exhaust valve (8-1) is installed on the ventilation duct (5) connected to the indoor exhaust outlet (8-2). A portion of the radiant floor heating system arranged at the air supply outlet of the air supply shaft (1) serves as a fresh air preheating zone (3) for heating the fresh air supplied to the fresh air supply system (2) in winter. The air supply system (2) includes a fresh air filter (2-1), a fresh air fan (2-2), and a fresh air supply valve (2-3). The fresh air filter (2-1) is arranged at the air outlet and is connected to the fresh air fan (2-2). The fresh air supply valve (2-3) is installed on the ventilation pipe (5) connected to the fresh air fan (2-2). The indoor return air system (4) includes an indoor return air filter (4-1), an indoor return air fan (4-2), and an indoor return air valve (4-3). The indoor return air filter (4-1) is arranged at the return air outlet and is connected to the indoor return air fan (4-2). The indoor return air valve (4-3) is installed on the ventilation pipe (5) connected to the indoor return air fan (4-2). The process of switching operating conditions for the ventilation system between winter and summer is as follows: T a For the temperature of the air supply shaft, T i Indoor air temperature; In summer, the air temperature in the air supply shaft (1) is adjusted according to the indoor air temperature. T a Less than or equal to T i At +5℃, open the fresh air supply valve (2-3) and the fresh air exhaust valve (7) to 100% opening, close the indoor return air valve (4-3) and the indoor exhaust valve (8-1), fully open the fresh air fan (2-2), close the indoor return air fan (4-2), and the air in the air supply shaft (1) flows into the ventilation duct (5) driven by the fresh air fan (2-2). T a Greater than T i At +5℃, all air valves are closed and all fans are turned off; In winter, the fresh air preheating zone is adjusted according to the temperature of the ventilation shaft. T a When the temperature is below -10 ℃, the ventilation floor system operates only in indoor air circulation mode. At this time, the indoor return air valve (4-3) and indoor exhaust air valve (8-1) are open at night and not open during the day. The fresh air supply valve (2-3) and fresh air exhaust valve (7) are closed. The indoor return air fan (4-2) is open at night and closed during the day. The fresh air fan (2-2) is closed. when T a When the temperature is above -10℃, the ventilation floor system operates in a mixed mode of indoor circulation and fresh air preheating. The indoor return air valve (4-3), fresh air supply valve (2-3) and indoor exhaust valve (8-1) are opened. The opening degree of the indoor return air valve (4-3) is 80%, the opening degree of the fresh air supply valve (2-3) is 20%, the fresh air exhaust valve (7) is closed, and the fresh air fan (2-2) and the indoor return air fan (4-2) are both turned on. At this time, the fresh air in the air supply shaft (1) flows through the fresh air supply valve (2-3) and is heated in the fresh air preheating zone. It is then mixed with the indoor return air at the indoor return air valve (4-3) and flows into the room through the indoor exhaust port (8-2).

2. The ventilated floor system for ultra-low energy consumption residential buildings in cold regions according to claim 1, characterized in that: Multiple ventilation pipes (5) are arranged, and the center distance between adjacent ventilation pipes (5) is 10-20cm.

3. The ventilated floor system for ultra-low energy consumption residential buildings in cold regions according to claim 1, characterized in that: The number of hot water pipes (10-2) arranged in the fresh air preheating zone (3) is greater than the number of hot water pipes (10-2) arranged in the rest of the radiant floor heating system.

4. The ventilated floor system for ultra-low energy consumption residential buildings in cold regions according to claim 1, characterized in that: The ventilation pipe (5) is a plastic pipe, a metal square pipe or a flat pipe, and the distance between the ventilation pipe (5) and the electric heating film (10-1) is 2-4cm.

5. A ventilated floor system suitable for ultra-low energy consumption residential buildings in cold regions according to claim 1, characterized in that: The insulation layer (13) is an EPS insulation layer.

6. A ventilated floor system suitable for ultra-low energy consumption residential buildings in cold regions according to claim 1, characterized in that: The intermediate layer (12) is a cement mortar layer.

7. A ventilation operation control method suitable for ultra-low energy consumption residential buildings in cold regions, characterized in that: Based on the ventilated floor system of claim 3, the method comprises the following: S1. Set monitoring parameters T a For the temperature of the air supply shaft, T i Indoor air temperature; S2. In summer, the air temperature in the air supply shaft (1) and the indoor air temperature are adjusted according to the temperature. T a Less than or equal to T i At +5℃, open the fresh air supply valve (2-3) and the fresh air exhaust valve (7) to 100% opening, close the indoor return air valve (4-3) and the indoor exhaust valve (8-1), fully open the fresh air fan (2-2), close the indoor return air fan (4-2), and the air in the air supply shaft (1) flows into the ventilation duct (5) driven by the fresh air fan (2-2). T a Greater than T i At +5℃, all air valves are closed and all fans are turned off; In winter, the fresh air preheating zone is adjusted according to the temperature of the ventilation shaft. T a When the temperature is below -10 ℃, the ventilation floor system operates only in indoor air circulation mode. At this time, the indoor return air valve (4-3) and indoor exhaust air valve (8-1) are open at night and not open during the day. The fresh air supply valve (2-3) and fresh air exhaust valve (7) are closed. The indoor return air fan (4-2) is open at night and closed during the day. The fresh air fan (2-2) is closed. when T a When the temperature is above -10℃, the ventilation floor system operates in a mixed mode of indoor circulation and fresh air preheating. The indoor return air valve (4-3), fresh air supply valve (2-3) and indoor exhaust valve (8-1) are opened. The opening degree of the indoor return air valve (4-3) is 80%, the opening degree of the fresh air supply valve (2-3) is 20%, the fresh air exhaust valve (7) is closed, and the fresh air fan (2-2) and the indoor return air fan (4-2) are both turned on. At this time, the fresh air in the air supply shaft (1) flows through the fresh air supply valve (2-3) and is heated in the fresh air preheating zone. It is then mixed with the indoor return air at the indoor return air valve (4-3) and flows into the room through the indoor exhaust port (8-2).

8. The ventilation operation control method for ultra-low energy consumption residential buildings in cold regions according to claim 7, characterized in that: All air valves are electric air valves, and their opening degree is controlled by an electric air valve controller. The control signal of the electric air valve controller is a voltage signal of 0-10 V or a current signal of 4-20 mA.

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