Airborne energy radiation air conditioning work station air supply terminal system and its radiation capacity calculation method

Abstract

The application provides an air energy-carrying radiation air conditioner work station air supply end system and a radiation capacity calculation method thereof. The system comprises an air conditioner unit, which is communicated with a floor radiation cavity below a floor through an air distribution channel. A supply air pipe is arranged on a double-sided radiation plate corresponding to the work station on the floor. The lower end of the supply air pipe is communicated with the floor radiation cavity, and the upper end is connected with a cavity of the double-sided radiation plate of the work station. Radiation holes are distributed on the two sides of the double-sided radiation plate. The calculation method comprises the following steps: step one, calculating the capacity of the double-sided radiation plate of the work station; step two, calculating the radiation capacity of the floor radiation cavity; and step three, verifying whether the total radiation capacity of the capacity of the double-sided radiation plate of the work station and the radiation capacity of the floor radiation cavity meets the required radiation per unit area of the room.

Description

Technical Field

[0001] This invention relates to the field of air-based radiation, and in particular to an air-based radiation air conditioning station air supply terminal system and a method for calculating its radiation capacity. Background Technology

[0002] Currently, most building air conditioning equipment uses air convection to cool or heat indoor air, which has two major drawbacks. (1) Air conditioning terminals use convection to cool (heat), which creates a draft sensation on the human body, and this draft sensation is one of the main causes of thermal discomfort. (2) Convection terminals, represented by air vents, are fixed during installation, resulting in uneven indoor thermal environment. The difference in thermal comfort between the human body and the terminal is huge, and the convection terminals lack flexibility. The above two drawbacks will further lead to energy waste. Therefore, it is of great significance to develop air conditioning terminals with radiant cooling (heating) function and flexibility. Existing technologies have the following shortcomings: (1) Existing traditional radiant air conditioning systems require a heat source system and a place to place the heat source products. (2) Existing radiant composite systems combined with workstation air supply use water as the energy medium, which is prone to water leakage and condensation damage to air conditioning equipment. Summary of the Invention

[0003] To address the issues of insufficient comfort and energy waste in traditional air conditioning, this invention provides an air-powered radiant air conditioning station air supply terminal system and a method for calculating its radiation capacity, thereby improving cooling or heating comfort and calculating the system's radiation capacity.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an air-powered radiant air conditioning station air supply terminal system, including an air conditioning unit, the air conditioning unit is connected to the floor radiant cavity under the floor through an air distribution channel, the floor is provided with an air supply pipe corresponding to the station double-sided radiant plate, the lower end of the air supply pipe is connected to the floor radiant cavity, the upper end is connected to the cavity of the station double-sided radiant plate, and radiant holes are distributed on both sides of the station double-sided radiant plate.

[0005] In a preferred embodiment, the flooring comprises, from top to bottom, a marble slab layer, an expanded vitrified microsphere lightweight mortar layer, and a cement mortar layer.

[0006] In a preferred embodiment, an aluminum plate is provided inside the floor radiant cavity.

[0007] This invention also provides a method for calculating the radiation capacity of an air-powered radiant air conditioning station air supply terminal system, comprising the following steps:

[0008] Step 1: Calculate the capacity of the double-sided radiant panel at the workstation:

[0009] S1.1, Radiation cooling or radiation heating capacity of the double-sided radiant panel per unit area of ​​workstation;

[0010] S1.2 Calculate the radiant cooling capacity or radiant heating capacity of the double-sided radiant panel at each workstation based on the area of ​​each double-sided radiant panel and the number of double-sided radiant panels at each workstation.

[0011] Step 2: Estimate the required cooling capacity per unit area of ​​the floor based on the required cooling load per square meter of the room, or estimate the required heating capacity per unit area of ​​the floor based on the required heating load per square meter of the room.

[0012] Step 3: Design the radiation capacity of the floor radiant cavity: The cooling capacity of the floor radiant cavity per unit area is the sum of the radiant cooling capacity per unit floor area and the convective cooling capacity per unit floor area, or the heating capacity of the floor radiant cavity per unit area is the sum of the radiant heating capacity per unit floor area and the convective heating capacity per unit floor area.

[0013] In the preferred embodiment, in S1.1, the radiant cooling or radiant heating capacity of the double-sided radiant panel per unit area of ​​the workstation is... The calculation formula is as follows:

[0014] (1);

[0015] (2);

[0016] (3);

[0017] Among these methods, the area-weighted average temperature of the indoor unheated surfaces can be calculated by measuring the temperature of the surrounding walls under radiant conditions. :

[0018] (4);

[0019] In the formula: The temperature of the room's overall surface, in K; The temperature of the double-sided radiant panel surface at the workstation, in K; The temperature difference between the surface temperature of the double-sided radiant panel at the workstation and the overall surface temperature difference of the room is expressed in °C. Let i be the surface area of ​​the i-th surface of the room. ; This refers to the area of ​​the double-sided radiant panel at the workstation. ; Let be the angle coefficient between the double-sided radiating plate at the workstation and the i-th surface; For room number i Surface emissivity; For Boltzmann constant, 5.67 × W / ( · ); For the first iSurface thermodynamic temperature, K; The surface temperature of the double-sided radiant panel at the workstation is ℃; It is the room's emissivity; μ It is the opening ratio of the double-sided radiant panel at the workstation.

[0020] In the preferred embodiment, in step S1.2, the radiant cooling or radiant heating capacity of the double-sided radiant panel at the workstation is... :

[0021] (5);

[0022] In the formula: This refers to the area of ​​the double-sided radiant panel at the workstation. N represents the number of double-sided radiant panels at each workstation.

[0023] In the preferred embodiment, step two involves calculating the required cooling or heating capacity per unit area of ​​the floor. :

[0024] (6);

[0025] (7);

[0026] (8);

[0027] In the formula: This represents the total cooling load or total heating load of the room, in W; Indicates the design cooling load or design heating load of the air conditioning system when using double-sided radiant panels in an indoor workstation, in W; This indicates the required cooling load per square meter of a room or the required heating load per square meter of a room. The required cooling load per square meter of a room can be determined from the estimation index of air conditioning cooling load for civil buildings. 120W / The required heat load per square meter of room 110W / ; This refers to the room area; The ratio of the air conditioning design load to the total room load when using double-sided radiant panels at workstations is taken as 0.75. This refers to the cooling capacity or heating capacity required per unit area of ​​the floor.

[0028] In the preferred embodiment, in step three, the cooling capacity per unit area of ​​the floor radiant cavity during summer operation is... The calculation formula is as follows:

[0029] (9);

[0030] (10);

[0031] (11);

[0032] (12);

[0033] (13);

[0034] (14);

[0035] (15);

[0036] In the formula: This represents the radiative cooling capacity per unit area of ​​the ground. This represents the convective cooling capacity per unit area of ​​ground; Indicates the average ground temperature; Indicates the indoor design temperature; This indicates the cooling capacity required per unit floor area.

[0037] During winter operation, the heating capacity per unit area of ​​floor can be calculated using the following formula:

[0038] (16);

[0039] (17);

[0040] (18);

[0041] (19);

[0042] In the formula: This indicates the amount of heating required per unit floor area. This represents the amount of radiant heating per unit floor area. This indicates the convective heating capacity per unit floor area.

[0043] The present invention provides an air-powered radiant air conditioning station air supply terminal system and its radiation capacity calculation method, which has the following beneficial effects:

[0044] (1) This calculation method establishes a room geometric model and proposes a simplified algorithm for the angle coefficient of each surface of the room and the double-sided radiant micro-perforated aluminum plate of the work station based on the basic theory of heat transfer. Referring to the previous calculation method for the radiative heat transfer between the double-sided radiant micro-perforated aluminum plate of the work station and each surface, the radiation capacity of the double-sided radiant micro-perforated aluminum plate of the work station in this system under two different working conditions of cooling (heating) is obtained.

[0045] (2) This calculation method calculates the radiative heat transfer of the orifice plate under different plate temperatures and heat transfer temperature differences based on the basic formula of radiative heat transfer. Then, a simplified formula for radiative heat transfer of this system is obtained through fitting. The obtained radiative heat transfer fitting formula can reflect the relationship between the radiative heat transfer of the orifice plate and the orifice plate temperature and heat transfer temperature difference to a certain extent.

[0046] (3) Based on the basic theory of heat transfer, the calculation method can design the radiation capacity of the floor radiation cavity of this system according to the required cooling load per square meter of the room or the required cooling load per square meter of the room, and obtain the structural layers of the floor cavity of this system. Attached Figure Description

[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0048] Figure 1 This is an overall structural diagram of the present invention;

[0049] Figure 2 This is a floor structure layer diagram of the present invention;

[0050] Figure 3 This is an isometric drawing of the room in the example;

[0051] Figure 4 This is a room floor plan of an example;

[0052] In the diagram: 1. Air conditioning unit; 2. Air distribution channel; 3. Floor radiant cavity; 4. Floor; 5. Double-sided radiant panel for workstation. Detailed Implementation

[0053] An air-powered radiant air conditioning station air supply terminal system includes an air conditioning unit. The air conditioning unit is connected to the floor radiant cavity under the floor through an air distribution channel. The floor is equipped with an air supply pipe corresponding to the double-sided radiant panel of the station. The lower end of the air supply pipe is connected to the floor radiant cavity, and the upper end is connected to the cavity of the double-sided radiant panel of the station. Radiation holes are distributed on both sides of the double-sided radiant panel of the station.

[0054] The floor's structure, from top to bottom, includes a marble slab layer, an expanded vitrified microsphere lightweight mortar layer, and a cement mortar layer. Its structural layers have very low thermal resistance, allowing for excellent heat transfer.

[0055] Preferably, an aluminum plate is provided inside the floor radiant cavity. The aluminum plate has a high thermal conductivity, which can effectively transfer cold (heat) energy.

[0056] The room dimensions in the example room of the embodiment of the present invention are as follows: Emissivity of various surfaces and radiant panels in the room The value is 0.9. The dimensions of the double-sided radiant plate of the double-sided radiant microporous aluminum plate station device are: (Width × Height), Area of ​​a single-sided radiating panel = =1.44 .

[0057] A method for calculating the radiation capacity of an air-powered radiant air conditioning terminal system includes the following steps:

[0058] Step 1: Calculate the capacity of the double-sided radiant panel at the workstation:

[0059] S1.1, Radiation cooling capacity or radiation heating capacity of the double-sided radiant panel per unit area of ​​workstation.

[0060] In S1.1, the radiant cooling or radiant heating capacity of the double-sided radiant panel per unit area of ​​the workstation. The calculation formula is as follows:

[0061] (1);

[0062] (2);

[0063] (3);

[0064] Among these methods, the area-weighted average temperature of the indoor unheated surfaces can be calculated by measuring the temperature of the surrounding walls under radiant conditions. :

[0065] (4);

[0066] In the formula: The temperature of the room's overall surface, in K; The temperature of the double-sided radiant panel surface at the workstation, in K; The temperature difference between the surface temperature of the double-sided radiant panel at the workstation and the overall surface temperature difference of the room is expressed in °C. Let i be the surface area of ​​the i-th surface of the room. ; This refers to the area of ​​the double-sided radiant panel at the workstation. ; Let be the angle coefficient between the double-sided radiant plate at the workstation and the i-th surface; Let be the emissivity of the i-th surface of the room; For Boltzmann constant, 5.67 × W / ( · ); Let be the thermodynamic temperature of the i-th surface, in K; The surface temperature of the double-sided radiant panel at the workstation is ℃; is the emissivity of the room; μ is the aperture ratio of the double-sided radiant panel at the workstation.

[0067] S1.2 Calculate the radiant cooling capacity or radiant heating capacity of the double-sided radiant panel at each workstation based on the area of ​​each double-sided radiant panel and the number of double-sided radiant panels at each workstation.

[0068] In S1.2, the radiant cooling or radiant heating capacity of the double-sided radiant panel at the workstation is: :

[0069] (5);

[0070] In the formula: This refers to the area of ​​the double-sided radiant panel at the workstation. N represents the number of double-sided radiant panels at each workstation.

[0071] In summer, the indoor temperature is generally around 20℃. By measuring the temperature of the surrounding walls under radiant conditions, the area-weighted average temperature of the unheated indoor surfaces can be calculated. .

[0072] The double-sided radiant panel at the workstation is a square with sides of 1.2m, so the area is... It is 1.44 square meters.

[0073] Will Set the temperature to 15℃ and substitute it into the calculation. =12.4℃.

[0074] The aperture ratio μ of the double-sided radiant plate at the workstation is set to 0.008.

[0075] Based on the above formula and Figure 3 Design data obtained .

[0076] The radiant cooling capacity of a double-sided radiant panel at a workstation in summer is: If the number N of the double-sided radiant panels at the workstation is 3, then the radiative heat transfer of the three radiant panels is... W.

[0077] Similarly, the formula for radiant heat transfer from radiant panels to the building envelope in winter can be derived:

[0078] ;

[0079] Furthermore, the operating temperature of radiant panels in winter is generally 30~35℃, and the surface temperature of the building envelope is... =18℃, so If we substitute 30℃ into the calculation, then... .

[0080] It can be found W.

[0081] Step 2: Estimate the required cooling capacity per unit area of ​​the floor based on the required cooling load per square meter of the room, or estimate the required heating capacity per unit area of ​​the floor based on the required heating load per square meter of the room.

[0082] In step two, the required cooling or heating capacity per unit area of ​​the floor is calculated. :

[0083] (6);

[0084] (7);

[0085] (8);

[0086] In the formula: This represents the total cooling load or total heating load of the room, in W; Indicates the design cooling load or design heating load of the air conditioning system when using double-sided radiant panels in an indoor workstation, in W; This indicates the required cooling load per square meter of a room or the required heating load per square meter of a room. The required cooling load per square meter of a room can be determined from the estimation index of air conditioning cooling load for civil buildings. 120W / The required heat load per square meter of room 110W / ; This refers to the room area; The ratio of the air conditioning design load to the total room load when using double-sided radiant panels at workstations is taken as 0.75. This refers to the cooling capacity or heating capacity required per unit area of ​​the floor.

[0087] During summer cooling operation: W, according to Figure 3 and Figure 4 The data can be obtained , .

[0088] During winter heating operation, W, according to Figure 3 and Figure 4 The data can be obtained .

[0089] Step 3: Design the radiation capacity of the floor radiant cavity: The cooling capacity of the floor radiant cavity per unit area is the sum of the radiant cooling capacity per unit floor area and the convective cooling capacity per unit floor area, or the heating capacity of the floor radiant cavity per unit area is the sum of the radiant heating capacity per unit floor area and the convective heating capacity per unit floor area.

[0090] Cooling capacity per unit area of ​​the floor radiant cavity during summer operation. The calculation formula is as follows:

[0091] (9);

[0092] (10);

[0093] (11);

[0094] (12);

[0095] (13);

[0096] (14);

[0097] (15);

[0098] In the formula: This represents the radiative cooling capacity per unit area of ​​the ground. This represents the convective cooling capacity per unit area of ​​ground; Indicates the average ground temperature; This indicates the indoor design temperature. Under summer conditions, the indoor design temperature for this system is 28℃. This indicates the cooling capacity required per unit area of ​​ground.

[0099] Will Substituting into (7), we can obtain Substituting into (9), we can obtain

[0100] From (4), we can know By combining (10), (11), and (8), we can obtain .

[0101] In summary .

[0102] During winter operation, the heating capacity per unit area of ​​floor can be calculated using the following formula:

[0103] (16);

[0104] (17);

[0105] (18);

[0106] (19);

[0107] In the formula: This indicates the amount of heating required per unit floor area. This represents the amount of radiant heating per unit floor area. This indicates the convective heating capacity per unit floor area.

[0108] =18℃, combining equations (10), (11), (12), (13), (14), and (15), we can obtain .

Claims

1. A method for calculating the radiation capacity of an air-powered radiant air conditioning terminal system, characterized in that, The air-powered radiant air conditioning station air supply terminal system includes an air conditioning unit. The air conditioning unit is connected to the floor radiant cavity under the floor through an air distribution channel. The floor is equipped with air supply pipes on the double-sided radiant panels corresponding to the station. The lower end of the air supply pipe is connected to the floor radiant cavity, and the upper end is connected to the cavity of the double-sided radiant panel of the station. Radiation holes are distributed on both sides of the double-sided radiant panel of the station. Includes the following steps: Step 1: Calculate the capacity of the double-sided radiant panel at the workstation: S1.1 Calculate the radiant cooling or radiant heating capacity of the double-sided radiant panel per unit area of ​​the workstation. The calculation formula is as follows: (1)； (2)； (3)； Among these methods, the area-weighted average temperature of the indoor unheated surfaces can be calculated by measuring the temperature of the surrounding walls under radiant conditions. : （4）； In the formula: The temperature of the room's overall surface, in K; The temperature of the double-sided radiant panel surface at the workstation, in K; The temperature difference between the surface temperature of the double-sided radiant panel at the workstation and the overall surface temperature difference of the room is expressed in °C. For room number i Surface area ; This refers to the area of ​​the double-sided radiant panel at the workstation. ; For the double-sided radiant panel of the workstation and the first i Angular coefficient between surfaces; For room number i Surface emissivity; For Boltzmann constant, 5.67 × W / ( · ); For the first i Surface thermodynamic temperature, K; The surface temperature of the double-sided radiant panel at the workstation is ℃; It is the room's emissivity; μ It is the aperture ratio of the double-sided radiant panel at the workstation; S1.2 Calculate the radiant cooling capacity or radiant heating capacity of the double-sided radiant panel at each workstation based on the area of ​​each double-sided radiant panel and the number of double-sided radiant panels at each workstation. Step 2: Estimate the required cooling capacity per unit area of ​​the floor based on the required cooling load per square meter of the room, or estimate the required heating capacity per unit area of ​​the floor based on the required heating load per square meter of the room. Step 3: Design the radiation capacity of the floor radiant cavity: The cooling capacity of the floor radiant cavity per unit area is the sum of the radiant cooling capacity per unit floor area and the convective cooling capacity per unit floor area, or the heating capacity of the floor radiant cavity per unit area is the sum of the radiant heating capacity per unit floor area and the convective heating capacity per unit floor area.

2. The method for calculating the radiation capacity of an air-powered radiant air conditioning terminal system according to claim 1, characterized in that, The flooring consists of a marble slab layer, an expanded vitrified microsphere lightweight mortar layer, and a cement mortar layer from top to bottom.

3. The method for calculating the radiation capacity of an air-powered radiant air conditioning terminal system according to claim 1, characterized in that, An aluminum plate is installed inside the floor radiation cavity.

4. The method for calculating the radiation capacity of an air-powered radiant air conditioning terminal system according to claim 1, characterized in that, In S1.2, the radiant cooling or radiant heating capacity of the double-sided radiant panel at the workstation is: : （5）； In the formula: This refers to the area of ​​the double-sided radiant panel at the workstation. N represents the number of double-sided radiant panels at the workstation.

5. The method for calculating the radiation capacity of an air-powered radiant air conditioning terminal system according to claim 1, characterized in that, In step two, the required cooling or heating capacity per unit area of ​​the floor is calculated. : (6)； （7）； (8)； In the formula: This represents the total cooling load or total heating load of the room, in W; Indicates the design cooling load or design heating load of the air conditioning system when using double-sided radiant panels in an indoor workstation, in W; This indicates the required cooling load per square meter of a room or the required heating load per square meter of a room. The required cooling load per square meter of a room can be determined from the estimation index of air conditioning cooling load for civil buildings. 120W / The required heat load per square meter of room 110W / ; This refers to the room area; The ratio of the air conditioning design load to the total room load when using double-sided radiant panels at workstations is taken as 0.

75. This refers to the cooling capacity or heating capacity required per unit area of ​​the floor.

6. The method for calculating the radiation capacity of an air-powered radiant air conditioning terminal system according to claim 1, characterized in that, In step three, under summer operating conditions, the cooling capacity of the floor radiant cavity per unit area is... The calculation formula is as follows: (9)； (10)； (11)； (12)； (13)； (14)； (15)； In the formula: This represents the radiative cooling capacity per unit area of ​​the ground. This represents the convective cooling capacity per unit area of ​​ground; Indicates the average ground temperature; Indicates the indoor design temperature; This indicates the cooling capacity required per unit floor area. During winter operation, the heating capacity per unit area of ​​floor can be calculated using the following formula: (16)； (17)； (18)； (19)； In the formula: This indicates the amount of heating required per unit floor area. This represents the amount of radiant heating per unit floor area. This indicates the convective heating capacity per unit floor area.

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