JP6804740B2 - Radiant air conditioning system - Google Patents

Description

The present invention relates to a radiant air conditioning system in which a radiant panel installed on the ceiling is used for temperature control in an air-conditioned space.

For cooling and heating inside the building, in addition to the method of blowing cooled and heated air, the temperature of the panel surface is controlled by the heat medium (cold and hot water) passing through the inside, and the temperature of the living room is adjusted by radiant heat. The method is known. Cooling and heating using such radiant heat have an advantage that the load on the body of the worker in the living room is small because the temperature-controlled air does not directly hit the body. Patent Document 1 and Patent Document 2 disclose a radiant panel for cooling or heating using such radiant heat.
Japanese Unexamined Patent Publication No. 8-86475 Japanese Unexamined Patent Publication No. 9-152146

As described above, radiant air conditioning is an air conditioning system that directly cools and heats the radiant panel and the frame with cold and hot water, and is an air conditioning system that is excellent in comfort and less burdensome to the body, but has the following problems in control. ..

In the conventional radiant air conditioning system, the wall surface of the living room is directly cooled and heated by the radiant heat transfer from the radiant panel, while the air in the living room is cooled by the convective heat transfer from the radiant panel and the wall surface.・ Because it is heated, there is a thermal delay. Therefore, when air is the control target, there is a problem of control responsiveness such as poor responsiveness and unstable control. For example, when the load is small, the cold / hot water circulating in the radiation panel moves in a flow rate similar to that of ON-OFF operation.

Therefore, in order to overcome the above-mentioned problem of control responsiveness, a method of detecting the surface temperature of the radiation panel and performing control based on the surface temperature can be considered. However, since the surface temperature of the radiation panel is distributed, there is a problem that appropriate control cannot be performed if only one measurement point is used. Therefore, considering the surface temperature distribution of the radiation panel, it is conceivable to increase the number of sensors in order to detect the temperature at multiple points on the radiation panel, but this causes a new problem that the cost increases. ..

The present invention solves the above-mentioned problems, and the radiation air conditioning system according to the present invention measures the temperature of the air conditioning target space by circulating cold and hot water through a radiation panel installed in the air conditioning target space. In the radiant air conditioning system to be adjusted, a room temperature sensor that measures the temperature of the air-conditioned space, an inlet-side temperature sensor that measures the temperature on the inlet side of the cold / hot water circulated through the radiant panel, and cold / hot water circulated through the radiant panel. An outlet side temperature sensor that measures the temperature on the outlet side, a flow sensor that measures the flow rate of cold and hot water flowing through the radiation panel, the temperature of the air conditioning target space measured by the room temperature sensor, and the inlet side temperature. The temperature of cold / hot water measured by the sensor, the temperature of cold / hot water measured by the outlet side temperature sensor, the flow rate of cold / hot water measured by the flow sensor, and the air-conditioned space where the radiation panel is installed. A load predicting means for predicting the load from the heat balance model, a target temperature setting means for setting the target living room air temperature of the air-conditioned space, and a flow controller for controlling the flow rate of cold / hot water flowing through the radiation panel. The command value for the flow controller is determined from the load predicted by the load predicting means, the target room air temperature set by the target temperature setting means, and the temperature of cold / hot water measured by the inlet side temperature sensor. It is characterized by having a main controller and a main controller.

Further, the radiation air conditioning system according to the present invention measures the temperature of the air conditioning target space in the radiation air conditioning system that adjusts the temperature of the air conditioning target space by circulating cold and hot water through a radiation panel installed in the air conditioning target space. The room temperature sensor, the inlet side temperature sensor that measures the temperature on the inlet side of the cold / hot water circulated in the radiation panel, the outlet side temperature sensor that measures the temperature on the outlet side of the cold / hot water circulated in the radiation panel, and the above. A flow sensor that measures the flow rate of cold / hot water flowing through the radiation panel, the temperature of the air-conditioned space measured by the room temperature sensor, the temperature of cold / hot water measured by the inlet side temperature sensor, and the outlet side temperature. A load prediction means for predicting the load from the temperature of the cold / hot water measured by the sensor, the flow rate of the cold / hot water measured by the flow sensor, and the heat balance model in the air-conditioned space where the radiation panel is installed. A target temperature setting means for setting a target living room air temperature in the air-conditioned space, a temperature controller for controlling the temperature of cold / hot water flowing through the radiation panel, a load predicted by the load predicting means, and the target temperature setting. It is characterized by having a target living room air temperature set by means, a flow rate of cold / hot water measured by the flow rate sensor, and a main controller that determines a command value for the temperature controller.

Further, the radiation air conditioning system according to the present invention measures the temperature of the air conditioning target space in the radiation air conditioning system that adjusts the temperature of the air conditioning target space by circulating cold and hot water through a radiation panel installed in the air conditioning target space. The room temperature sensor, the inlet side temperature sensor that measures the temperature on the inlet side of the cold / hot water circulated in the radiation panel, the outlet side temperature sensor that measures the temperature on the outlet side of the cold / hot water circulated in the radiation panel, and the above. A flow sensor that measures the flow rate of cold / hot water flowing through the radiation panel, the temperature of the air-conditioned space measured by the room temperature sensor, the temperature of cold / hot water measured by the inlet side temperature sensor, and the outlet side temperature. A load prediction means for predicting the load from the temperature of the cold / hot water measured by the sensor, the flow rate of the cold / hot water measured by the flow sensor, and the heat balance model in the air-conditioned space where the radiation panel is installed. The target working temperature setting means for setting the target living room working temperature of the air-conditioned space, the flow controller for controlling the flow rate of the cold / hot water flowing through the radiating panel, the load predicted by the load predicting means, and the target action. It is characterized by having a target living room operating temperature set by the temperature setting means, a temperature of cold / hot water measured by the inlet side temperature sensor, and a main controller that determines a command value for the flow controller.

Further, the radiation air conditioning system according to the present invention measures the temperature of the air conditioning target space in the radiation air conditioning system that adjusts the temperature of the air conditioning target space by circulating cold and hot water through a radiation panel installed in the air conditioning target space. The room temperature sensor, the inlet side temperature sensor that measures the temperature on the inlet side of the cold / hot water circulated in the radiation panel, the outlet side temperature sensor that measures the temperature on the outlet side of the cold / hot water circulated in the radiation panel, and the above. A flow sensor that measures the flow rate of cold / hot water flowing through the radiation panel, the temperature of the air-conditioned space measured by the room temperature sensor, the temperature of cold / hot water measured by the inlet side temperature sensor, and the outlet side temperature. A load prediction means for predicting the load from the temperature of the cold / hot water measured by the sensor, the flow rate of the cold / hot water measured by the flow sensor, and the heat balance model in the air-conditioned space where the radiation panel is installed. The target operating temperature setting means for setting the target living room operating temperature of the air-conditioned space, the temperature controller for controlling the temperature of the cold / hot water flowing through the radiation panel, the load predicted by the load predicting means, and the target action. It is characterized by having a target living room operating temperature set by a temperature setting means, a flow rate of cold / hot water measured by the flow rate sensor, and a main controller that determines a command value for the temperature controller.

Further, the radiant air conditioning system according to the present invention is characterized in that the radiant panel is installed on the ceiling of the air conditioning target space.

In the radiation air conditioning system according to the present invention, the temperature of the air conditioning target space measured by the room temperature sensor, the temperature of cold / hot water measured by the inlet side temperature sensor, and the temperature of cold / hot water measured by the outlet side temperature sensor. , The load is predicted from the flow rate of cold and hot water measured by the flow sensor and the heat balance model in the air-conditioned space where the radiation panel is installed, and based on this, the flow rate and temperature of the cold and hot water distributed by the radiation panel. Therefore, according to such a radiation air conditioning system according to the present invention, it is possible to control an air conditioning system that is stable and has good responsiveness without incurring costs.

It is a figure explaining the outline of the radiant air-conditioning system 1 which concerns on embodiment of this invention. It is a figure which shows typically the outline of the structure of the radiation panel 10 for one system. It is a figure which shows the heat balance model in the air-conditioning target space 3. It is a figure which shows the heat balance model in the vicinity of a unit radiation panel 11. It is a figure which shows the flowchart of the control by the radiant air-conditioning system 1 which concerns on embodiment of this invention. It is a figure which shows the flowchart of the control by the radiant air-conditioning system 1 which concerns on other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an outline of a radiant air conditioning system 1 according to an embodiment of the present invention.

The radiant air conditioning system 1 according to the present invention is provided for the purpose of adjusting the temperature in the air conditioning target space 3 by radiant air conditioning. In the air-conditioned space 3, a radiation panel 10 is provided so as to separate the living room (Room 5) and the ceiling (Plenum) 7.

The radiation panel 10 is a temperature control facility arranged on the ceiling of a living room space or the like, and the temperature is adjusted so that the living room space becomes an appropriate temperature by the heat radiated by the radiation panel 10.

The radiation panel 10 of the present embodiment is provided with a pipe 12 inside, and by circulating cold water through the pipe 12, it functions as a cooling facility for the living room 5. It is also possible to function as a heating facility by circulating hot water instead of cold water through the pipe 12. Hereinafter, in the present embodiment, a case where cold water is circulated through the pipe 12 will be described as an example.

In FIG. 1, the pipes 12 are connected by a * mark so that cold water circulates. The flow rate of cold water circulated in the pipe 12 and circulated to the radiation panel 10 is controlled by the cold / hot water flow rate controller 110. The cold / hot water flow rate controller 110 controls the opening degree of the valve 113 based on the command value (Q _{w, calc} ) from the main controller 100, which is the optimum flow rate water supply temperature calculator, or the rotation speed of the pump 114. The flow rate of cold water is controlled by controlling the temperature with the inverter 115.

On the other hand, the temperature of the cold water flowing through the radiation panel 10 is controlled by the cold / hot water temperature controller 150. The cold / hot water flow controller 110 is the primary of the heat exchanger 157 with the pipe 12 as the secondary side based on the command value (θ _{w, 0, calc} ) from the main controller 100, which is the optimum flow water supply temperature calculator. By controlling the flow rate of the refrigerant in the side pipe 151 by the opening degree of the valve 153 or by controlling the rotation speed of the pump 154 by the inverter 155, the amount of heat exchanged in the pipe 12 is controlled, and the result is As a result, the temperature of the cold water flowing through the radiation panel 10 is controlled. Reference numeral 152 denotes a heat source provided in the primary side pipe 151.

The radiation air conditioning system 1 according to the present invention is provided with a room temperature sensor 50, an inlet side temperature sensor 60, an outlet side temperature sensor 70, and a flow rate sensor 80.

The room temperature sensor 50 is a sensor that measures the temperature (θ _ra ) of the living room 5 in the air-conditioned space 3. The temperature data measured by the room temperature sensor 50 is transmitted to the main controller 100, and the main controller 100 determines each command value.

The inlet side temperature sensor 60 is a sensor that measures the temperature (θ _{w, 0} ) of the cold water flowing into the radiation panel 10. The temperature data measured by the inlet side temperature sensor 60 is transmitted to the main controller 100, and the main controller 100 is used to determine each command value.

The outlet side temperature sensor 70 is a sensor that measures the temperature (θ _{w, n} ) of the cold water flowing out from the radiation panel 10. The temperature data measured by the outlet-side temperature sensor 70 is transmitted to the main controller 100, and the main controller 100 determines each command value.

The flow rate sensor 80 is a sensor that measures the flow rate (Q _w ) of cold water that circulates in the pipe 12 (that is, circulates in the radiation panel 10). The flow rate data measured by the flow rate sensor 80 is transmitted to the main controller 100, and the main controller 100 determines each command value.

Next, a more detailed configuration of the radiation panel 10 used in the radiation air conditioning system 1 according to the present invention will be described. The radiation panel 10 for one system is composed of a plurality of unit radiation panels 11. Hereinafter, in the present embodiment, an example in which the radiation panel 10 for one system is provided in the air conditioning target space 3 will be described for simplicity, but the radiation air conditioning system 1 may have a plurality of radiation panels 10. ..

FIG. 2 is a diagram schematically showing an outline of the configuration of the radiation panel 10 for one system. In the present embodiment, the radiation panel 10 for one system is composed of n unit radiation panels 11. The pipe 12 inserts all of these n unit radiation panels 11. Although not shown in FIG. 2, each unit radiation panel 11 has an aluminum punching panel 14, and the aluminum punching panel 14 is cooled from the pipe 12 via the heat sink 13. In the present embodiment, the description will be based on the unit radiation panel 11 in which the aluminum punching panel 14 is cooled from the pipe 12 via the heat sink 13, but the radiation that can be adopted in the radiation air conditioning system 1 according to the present invention. The form of the unit radiation panel 11 constituting the panel 10 is not limited to this.

In FIG. 2, θ _{w and k} are defined as the outlet temperature of the kth unit radiation panel 11. That is, θ _{w, 0} is the forward temperature of the cold water to the radiation panel 10, the temperature measured by the inlet side temperature sensor 60, and θ _{w, n} is the temperature of the cold water flowing out from the radiation panel 10, and is the outlet. This is the temperature measured by the side temperature sensor 70.

Further, in FIG. 2, θ _{rs and k} are the surface temperatures on the room side of the kth unit radiation panel 11, and θ _{ps and k} are the _{attic of the kth} unit radiation panel 11. Defined as the side surface temperature.

Next, the heat balance model in the radiant air conditioning system 1 according to the present invention configured as described above will be described. FIG. 3 is a diagram showing a heat balance model in the air-conditioned space 3, FIG. 3 (a) shows the model itself, and FIG. 3 (b) shows an explanation of the definitions of variables in the figure. ..

Further, FIG. 4 is a diagram showing a heat balance model in the vicinity of the unit radiation panel 11. FIG. 4 (a) shows the model itself, and FIG. 4 (b) shows an explanation of the definitions of the variables in the figure.

In constructing the heat balance model in the radiant air conditioning system 1 according to the present invention, this is done by paying attention to the heat balance in (A) to (E) in FIGS. 3 and 4. More specifically, (A) is based on the heat balance in the living room 5, (B) is based on the heat balance in the ceiling 7, and (C) is the living room side surface of the radiation panel 10. (D) is based on the heat balance on the surface behind the ceiling of the radiant panel 10, and (E) is based on the surface of the radiant panel 10 on the living room side and the back of the ceiling and inside the pipe 12. It is based on the heat balance with cold water.

Formulations based on these heat balances are described in [Equation 1]. In [Equation 1], the formula (A) is formulated based on the heat balance of (A), the formula (B) is formulated based on the heat balance of (B), and the formula (B) is formulated based on the heat balance of (C). The formulas (C-1) to (Cn) are formulated, and the formulas (D-1) to (Dn) are formulated based on the heat balance of (D), and the heat balance of (E) is formulated. Equations (E-1) to (En) are formulated based on.

In this specification, "Academic Lecture Proceedings of the Society of Air Conditioning and Sanitary Engineering, Vol. 3, p.313-p.316 (DVD-ROM J-29)" 2 Report) Construction of a simple prediction method for ceiling radiation panel air conditioning performance ”Kiyoshi Ito, Yasuyoshi Akashi, Yasuhiro Miura, Toshihiro Kawamura, August 31, 2016” and related information on the conference announcement By doing so, it shall be used.

Here, each variable in the equation of [Equation 1] is as follows.
θ _ra ; Living room air temperature [℃]
θ _pa ; Attic air temperature [℃]
α _ad ; Heat transfer coefficient due to advection from the ceiling to the living room [W / K]
θ _{rs, k} ; kth panel Living room side surface temperature [° C]
θ _{ps, k} ; surface temperature behind the ceiling of the kth panel [° C]
θ _{w, k} ; outlet temperature of the kth panel [° C]
θ _{w, 0} ; Cold water forward temperature [° C]
Q _w ; Cold water flow rate [l / min]
q _br; room-side load [W]
q _bp ; Under-ceiling load [W]
_Sp ; Effective area per panel [m ² ]
_Sc ; Ceiling area other than the panel [m ² ]
L _p ; Piping length per panel [m]
ρ _w ; Specific gravity of water [kg / m ³ ]
c _w ; Specific heat of water [J / kg ・ K]
α _r ； Panel total heat transfer coefficient on the living room side [W / m ²・ K]
α _p ; Ceiling back panel total heat transfer coefficient [W / m ²・ K]
K _c ; Heat transmission coefficient of ceilings other than panels [W / m ² · K]
K _rps ; Heat transmission coefficient between the ceiling back side and the living room side surface [W / m ² · K]
κ; cold water-panel surface heat transmission coefficient 1
γ; Cold water-Panel surface heat transmission coefficient 2
beta; ratio K of K _r + K _p for K _{r r;} cold water - room side panel surface heat transfer coefficient [W / m · K]
K _p ; Cold water-Ceiling back panel surface heat transmission coefficient [W / m ・ K]
By the way, referring to the whole [Equation 1], the variables surrounded by the rectangular frame are (3n + 6). On the other hand, there are (3n + 2) numbers of equations in the whole [Equation 1]. From this, it can be seen that if four of the (3n + 6) variables are given as known, all the variables are given.

In the radiation air conditioning system 1 according to the present invention, the four known variables are the temperature measured by the room temperature sensor 50 (θ _ra ), the temperature measured by the inlet side temperature sensor 60 (θ _{w, 0} ), and the outlet side temperature. The temperature (θ _{w, n} ) measured by the sensor 70 and the flow rate (Q _w ) measured by the flow sensor 80 are used.

A control example of the radiant air conditioning system 1 according to the present invention based on the above concept will be described. FIG. 5 is a diagram showing a flowchart of control by the radiant air conditioning system 1 according to the embodiment of the present invention. Such a flowchart is executed by the main controller 100. Further, it is preferable that such a flowchart is executed at regular time intervals.

Here, in the radiant air conditioning system 1 according to the present invention, θ _{ra, set} (also referred to as “target living room air temperature”) _, which is a target value of room temperature θ _ra in the living room 5, is _set in the main controller 100. And. This is called a target value setting means.

In FIG. 5, when the control is started in step S100, the process proceeds to step S101, and the temperature (θ _ra ) measured by the room temperature sensor 50 and the set target value (θ _{ra, set} ) are determined. It is determined whether or not | θ _ra −θ _{ra, set} | ≧ Δ holds. Here, Δ is a predetermined predetermined amount, and is a threshold value of the amount of deviation from the allowable target value θ _{ra, set} .

When the determination result in step S101 is NO, the deviation of the temperature θ _ra is within the permissible range from the set target value, so that the process proceeds to step S108 and the process is terminated without performing any particularly active control. .. On the other hand, when the determination result in step S101 is YES, the deviation of the temperature θ _ra is out of the permissible range from the set target value, so the process proceeds to step S102 and control is performed so that the temperature θ _ra becomes the target value. Proceed with processing.

In step S102, the current value of the load is predicted by using the heat balance model shown in [Equation 1]. More specifically, by inputting the temperature θ _{w, 0} , the temperature θ _ra , the temperature θ _{w, n} , and the flow rate Q _w as four known numbers into the heat balance model, the load q _br on the living room side and the backside of the ceiling Get the output of the load q _bp .

Subsequently, in step S103, it is determined whether or not the flow rate (Q _w ) measured by the flow rate sensor 80 satisfies Q _{w, max} > Q _w > Q _{w, min} . Here, Q _{w and max} are the maximum flow rates allowed by the system as the flow rate of cold water in the pipe 12, and Q _{w and min} are the minimum flow rates allowed by the system as the flow rate of cold water in the pipe 12. ..

When the result of the determination in step S103 is YES, the room temperature in the living room 5 is controlled to be the target value based on the control of the flow rate of the cold water flowing through the radiation panel 10. At this time, the process proceeds to step S104, and the flow rate for setting the setting condition using the heat balance model is calculated. Specifically, the living room side load q _br , the ceiling back side load q _bp , the target value temperature θ _{ra, set} , and the measured temperature θ _{w, 0, which} are known in step S102, are input to the heat balance model. Then, the command flow rate Q _{w, calc} is calculated.

In the following step S105, the calculated Q _{w, calc} is commanded to the cold / hot water flow rate controller 110, so that the cold / hot water flow controller 110 controls the cold water flow rate Q _{w to} be Q _{w, calc} .

On the other hand, when the result of the determination in step S103 is NO, the room temperature in the living room 5 is controlled to be the target value based on the control of the temperature of the cold water flowing through the radiation panel 10. At this time, the process proceeds to step S106, and the flow rate for satisfying the setting condition using the heat balance model is calculated. Specifically, the living room side load q _br , the ceiling back side load q _bp , the target value temperature θ _{ra, set} , and the measured flow rate Q _{w, which} are known in step S102, are input to the heat balance model. Calculate the command temperature θ _{w, 0, calc} .

In the following step S105, the calculated θ _{w, 0, calc} is commanded to the cold / hot water temperature controller 150 so that the cold / hot water temperature controller 150 becomes the cold water temperature θ _{w, 0} becomes θ _{w, 0, calc.} Control.

The process ends in step S108.

As described above, in the radiation air conditioning system 1 according to the present invention, the temperature of the air conditioning target space measured by the room temperature sensor 50, the temperature of cold / hot water measured by the inlet side temperature sensor 60, and the outlet side temperature sensor 70. The load is predicted from the temperature of the cold / hot water measured by, the flow rate of the cold / hot water measured by the flow sensor 80, and the heat balance model in the air-conditioned space where the radiation panel 10 is installed, and based on this, Since the flow rate Q _w and the temperature θ _{w, 0} of the cold / hot water to be circulated by the radiation panel 10 are determined, the radiation air conditioning system 1 according to the present invention has good stable responsiveness without incurring costs. It becomes possible to control the air conditioning system.

Next, other embodiments of the present invention will be described. In the previous embodiment, the control target is the room temperature θ _ra of the living room 5, whereas in the present embodiment, the control target is the operating temperature OT, which is different, and other points have the same configuration. doing.

Here, as the working temperature OT, for example, the one obtained by the following equation (2) can be used. For such calculation of the operating temperature OT, for example, the calculation function of the main controller 100 can be used.

The working temperature that can be handled by the radiant air conditioning system 1 according to the present invention is not limited to this.

However,
α _c ; Convection heat transfer coefficient [W / m ² · K]
α _rr ; Radiant heat transfer coefficient [W / m ² · K]
Ψ _k ; View factor of radiation panel k Ψ _rw ; It is defined as the view factor of wall surface, floor surface, and ceiling surface (surface other than radiation panel).

FIG. 6 is a diagram showing a flowchart of control by the radiant air conditioning system 1 according to another embodiment of the present invention. Such a flowchart is executed by the main controller 100. Further, it is preferable that such a flowchart is executed at regular time intervals.

Here, in the radiant air conditioning system 1 according to the present invention, the OT _set (also referred to as “target living room working temperature”), which is the target value of the working temperature OT in the living room 5, is _set in the main controller 100. .. This is called a target value setting means.

In FIG. 6, when the control is started in step S200, the process proceeds to step S201, and from the calculated current working temperature (OT) and the set target value (OT _set ) of the working temperature, | It is determined whether or not OT-OT _set | ≧ Δ is satisfied. Here, Δ is a predetermined predetermined amount and is a threshold value of the amount of deviation from the allowable target value OT _set .

When the determination result in step S201 is NO, the deviation of the working temperature OT is within the permissible range from the set target value, so that the process proceeds to step S208 and the process is terminated without performing any particularly active control. .. On the other hand, when the determination result in step S201 is YES, the deviation of the working temperature OT is out of the permissible range from the set target value, so the process proceeds to step S202 and control is performed so that the working temperature OT becomes the target value. Proceed with processing.

In step S202, the current value of the load is predicted by using the heat balance model shown in [Equation 1]. More specifically, by inputting the temperature θ _{w, 0} , the temperature θ _ra , the temperature θ _{w, n} , and the flow rate Q _w as four known numbers into the heat balance model, the load q _br on the living room side and the backside of the ceiling Get the output of the load q _bp .

Subsequently, in step S203, it is determined whether or not the flow rate (Q _w ) measured by the flow rate sensor 80 satisfies Q _{w, max} > Q _w > Q _{w, min} . Here, Q _{w and max} are the maximum flow rates allowed by the system as the flow rate of cold water in the pipe 12, and Q _{w and min} are the minimum flow rates allowed by the system as the flow rate of cold water in the pipe 12. ..

When the result of the determination in step S203 is YES, the action temperature OT in the living room 5 is controlled to be the target value based on the control of the flow rate of the cold water flowing through the radiation panel 10. At this time, the process proceeds to step S204, and the flow rate for satisfying the setting condition using the heat balance model is calculated. Specifically, the living room side load q _br , the ceiling back side load q _bp , the target value OT _set of the operating temperature, and the measured temperature θ _{w, 0, which} are known in step S202, are input to the heat balance model. Then, the command flow rate Q _{w, calc} is calculated.

In the following step S205, the calculated Q _{w, calc} is commanded to the cold / hot water flow rate controller 110, so that the cold / hot water flow controller 110 controls the cold water flow rate Q _{w to} be Q _{w, calc} .

On the other hand, when the result of the determination in step S203 is NO, the operating temperature OT in the living room 5 is controlled to be the target value based on the control of the temperature of the cold water flowing through the radiation panel 10. At this time, the process proceeds to step S206, and the flow rate for satisfying the setting condition using the heat balance model is calculated. Specifically, the living room side load q _br , the ceiling back side load q _bp , the target value OT _set of the operating temperature, and the measured flow rate Q _{w, which} are known in step S202, are input to the heat balance model. Calculate the command temperature θ _{w, 0, calc} .

In the following step S205, the calculated θ _{w, 0, calc} is commanded to the cold / hot water temperature controller 150 so that the cold / hot water temperature controller 150 becomes the cold water temperature θ _{w, 0} becomes θ _{w, 0, calc.} Control.

The process ends in step S208.

In the radiation air conditioning system 1 according to the above embodiment, the temperature of the air conditioning target space measured by the room temperature sensor 50, the temperature of cold / hot water measured by the inlet side temperature sensor 60, and the outlet side temperature sensor 70 The load is predicted from the measured temperature of cold / hot water, the flow rate of cold / hot water measured by the flow sensor 80, and the heat balance model in the air-conditioned space where the radiation panel 10 is installed, and the load is radiated based on this. Since the flow rate Q _w and the temperature θ _{w, 0} of the cold / hot water to be circulated in the panel 10 can be determined and an appropriate working temperature can be maintained, the radiation air conditioning system 1 according to the present invention can be used without incurring costs. It is possible to control an air conditioning system that is stable and has good responsiveness.

In the present embodiment, control is performed so that the operating temperature becomes a set target value, but in the radiant air conditioning system 1 according to the present invention, for example, another index such as PMV (Predicted Mean Vote) is used. It can also be used for control to reach the set target value.

The derivation of [Equation 1] will be described below.
1. 1. About the heat balance model (1) Heat balance type in the living room a) Air in the living room

The above formula is a heat balance formula for living room air. Eq. (4) is derived by using the fact that the time derivative term on the left side is 0 at regular times and expressing each term on the right side by the temperature of each part.

b) Living room wall

The above formula is a heat balance formula for the wall surface of the living room. The following equation is derived by making the same assumption as "(1) a) Living room air".

Here, if θ _rw ≈ MRT _rw , then Eq. (7) is derived.

c) Living room heating element (load)

The above equation is a heat balance equation for a heating element. The following equation is derived by making the same assumption as "(1) a) Living room air".

(2) Heat balance type in the ceiling a) Attic air

The above formula is a heat balance formula for the air behind the ceiling. The following equation is derived by making the same assumption as "(1) a) Living room air".

b) Attic wall

The above formula is a heat balance formula for the wall surface behind the ceiling. The following equation is derived by making the same assumption as "(1) a) Living room air".

Here, if θ _pw = MRT _pw

c) Attic heating element (load)

The above formula is a heat balance formula for a heating element behind the ceiling. The following equation is derived by making the same assumption as "(1) a) Living room air".

(3) Heat balance on the living room side surface of the panel

The above formula is a heat balance formula on the surface of the panel on the living room side. The following equation is derived by making the same assumption as "(1) a) Living room air".

(4) Heat balance on the surface behind the ceiling of the panel

The above type is a heat balance type on the surface behind the ceiling of the panel. The following equation is derived by making the same assumption as "(1) a) Living room air".

(5) Heat balance type between the panel surface and the cold water in the panel piping

The above formula is a heat balance formula for cold water in the piping of the panel. Assuming a constant time, the integral function of the second term on the right side is constant, so the following equation is derived.

When the input conditions are the chilled water temperature θ _{w, 0} to the panel, the chilled water flow rate Q _w , the calorific value q _br , and q _bp during steady state, the variables (living room temperature, etc.) that you want to know are θ _ra , θ _rs , θ _rw , The equations are (4), (7), (9), (11), (14), (16) for nine of θ _pa , θ _ps , θ _pw , θ _{w, n} , θ _br , and θ _bp. ), (18), (20), and (22), each variable can be derived by the Newton-Rapson method or the like.

However, when grasping the load processing capacity, which is information necessary for determining the laying rate of the radiant ceiling panel, only the air temperature and the surface temperature of the panel are sufficient, and the wall temperature of the living room and the surface temperature of the heating element are sufficient. (Θ _rw , θ _pw , θ _br ,, θ _bp )
Is considered to be rarely needed. Therefore, a simplified model for obtaining only θ _ra , θ _rs , θ _pa , θ _ps , and θ _{w, n} is derived below.

The following equations are obtained by combining equations (4), (9), and (11), which are the heat balance equations of each part related to the living room.

The second to fourth terms on the right side of Eq. (23) are the heat flow related to the surface of the panel on the living room side, and can be expressed as the following equation.

θ _re : Living room side panel environmental temperature α _r = α _{r, c} + α _r , _r : Living room side total heat transfer coefficient Using this, assuming θ _re = θ _ra

In addition, if this assumption is applied to equation (18), which is the heat balance equation for the surface of the panel on the living room side,

The following equations are obtained by combining equations (11), (14), and (16), which are the heat balance equations for each part related to the ceiling.

The second to fourth terms on the right side of equation (27) are the heat flow related to the living room side surface of the panel, and can be expressed as the following equation.

θ _pe : Ceiling back panel environmental temperature α _p = α _{p, c} + α _{p, r} : Ceiling back total heat transfer coefficient Using this, assuming θ _pe = θ _pa

In addition, if this assumption is applied to equation (18), which is the heat balance equation for the surface behind the ceiling of the panel,

The temperature difference between the cold water in the panel pipe and the panel surface, which is the integral function of the first term on the right side of Eq. (22), the third term on the right side of Eq. (26), and the third term on the right side of Eq. It is considered to be a function that depends on the pipe length. Experiments have shown that the temperature difference between the cold water in the panel piping and the panel surface in one panel can be assumed to be constant. From this, if the integral function of each term is integrated for each panel, it can be expressed as follows.

here,

And.
Further, since K is considered to depend on the chilled water flow rate Q _w in the pipe, it is assumed as an exponential function related to the flow rate.

From the above assumptions, the equations (22), (26), and (30) can be rewritten into the heat balance equation for each panel, and become the following equations.

Since equations (39), (40), and (41) are formulated for each panel, n equations are prepared for each when n panels are connected in one system.

To show the heat balance formula again: (1) Heat balance formula for living room air:

here

And.
(2) Heat balance type for attic air:

here

And.
(3) Heat balance type for the living room side surface of the panel:

(4) Heat balance type for the surface behind the ceiling of the panel:

(5) Heat balance type between the panel surface and the cold water in the panel piping

Will be.
A comprehensive explanation table for each variable is attached below.

1 ... Radiant air conditioning system 3 ... Air conditioning target space 5 ... Living room (Room)
7 ... Attic (Plenum)
10 ... Radiation panel (for 1 system)
11 ... Unit radiation panel 12 ... Piping 13 ... Heat sink 14 ... Aluminum punching panel 21 ... Living room side surface 22 ... Ceiling back side surface 50 ... Room temperature sensor 60 ... Entrance side Temperature sensor 70 ・ ・ ・ Outlet side temperature sensor 80 ・ ・ ・ Flow rate sensor 100 ・ ・ ・ Main controller (optimal flow rate water supply temperature calculator)
110 ... Cold / hot water flow controller 113 ... Valve 114 ... Pump 115 ... Inverter 150 ... Cold / hot water temperature controller 151 ... Primary side piping 152 ... Heat source 153 ... Valve 154・ ・ ・ Pump 155 ・ ・ ・ Inverter 157 ・ ・ ・ Heat exchanger

Claims (5)

In a radiant air-conditioning system that adjusts the temperature of the air-conditioned space by circulating cold and hot water through a radiant panel installed in the air-conditioned space.
A room temperature sensor that measures the temperature of the air-conditioned space,
An inlet side temperature sensor that measures the temperature on the inlet side of the cold and hot water circulated through the radiant panel,
An outlet-side temperature sensor that measures the temperature on the outlet-side of the cold / hot water circulated through the radiant panel,
A flow rate sensor that measures the flow rate of cold and hot water distributed through the radiation panel,
The temperature of the air conditioning target space measured by the room temperature sensor, the temperature of cold / hot water measured by the inlet side temperature sensor, the temperature of cold / hot water measured by the outlet side temperature sensor, and the temperature of cold / hot water measured by the flow sensor A load prediction means for predicting the load from the flow rate of cold and hot water to be generated, a heat balance model in the air-conditioned space where the radiation panel is installed, and
A target temperature setting means for setting the target room air temperature of the air-conditioned space, and
A flow controller that controls the flow rate of cold and hot water distributed through the radiation panel,
The command value for the flow controller is determined from the load predicted by the load predicting means, the target room air temperature set by the target temperature setting means, and the temperature of cold / hot water measured by the inlet side temperature sensor. Main controller and
A radiant air conditioning system characterized by having. In a radiant air-conditioning system that adjusts the temperature of the air-conditioned space by circulating cold and hot water through a radiant panel installed in the air-conditioned space.
A room temperature sensor that measures the temperature of the air-conditioned space,
An inlet side temperature sensor that measures the temperature on the inlet side of the cold and hot water circulated through the radiant panel,
An outlet-side temperature sensor that measures the temperature on the outlet-side of the cold / hot water circulated through the radiant panel,
A flow rate sensor that measures the flow rate of cold and hot water distributed through the radiation panel,
The temperature of the air conditioning target space measured by the room temperature sensor, the temperature of cold / hot water measured by the inlet side temperature sensor, the temperature of cold / hot water measured by the outlet side temperature sensor, and the temperature of cold / hot water measured by the flow sensor. A load prediction means for predicting the load from the flow rate of cold and hot water to be generated, a heat balance model in the air-conditioned space where the radiation panel is installed, and
A target temperature setting means for setting the target room air temperature of the air-conditioned space, and
A temperature controller that controls the temperature of cold and hot water distributed through the radiant panel,
The main that determines the command value for the temperature controller from the load predicted by the load predicting means, the target room air temperature set by the target temperature setting means, and the flow rate of cold / hot water measured by the flow rate sensor. With the controller
A radiant air conditioning system characterized by having. In a radiant air-conditioning system that adjusts the temperature of the air-conditioned space by circulating cold and hot water through a radiant panel installed in the air-conditioned space.
A room temperature sensor that measures the temperature of the air-conditioned space,
An inlet side temperature sensor that measures the temperature on the inlet side of the cold and hot water circulated through the radiant panel,
An outlet-side temperature sensor that measures the temperature on the outlet-side of the cold / hot water circulated through the radiant panel,
A flow rate sensor that measures the flow rate of cold and hot water distributed through the radiation panel,
The temperature of the air conditioning target space measured by the room temperature sensor, the temperature of cold / hot water measured by the inlet side temperature sensor, the temperature of cold / hot water measured by the outlet side temperature sensor, and the temperature of cold / hot water measured by the flow sensor. A load prediction means for predicting the load from the flow rate of cold and hot water to be generated, a heat balance model in the air-conditioned space where the radiation panel is installed, and
A target operating temperature setting means for setting a target living room operating temperature of the air-conditioned space, and
A flow controller that controls the flow rate of cold and hot water distributed through the radiation panel,
A command value for the flow controller is obtained from the load predicted by the load predicting means, the target living room working temperature set by the target working temperature setting means, and the temperature of cold / hot water measured by the inlet side temperature sensor. The main controller to decide and
A radiant air conditioning system characterized by having. In a radiant air-conditioning system that adjusts the temperature of the air-conditioned space by circulating cold and hot water through a radiant panel installed in the air-conditioned space.
A room temperature sensor that measures the temperature of the air-conditioned space,
An inlet side temperature sensor that measures the temperature on the inlet side of the cold and hot water circulated through the radiant panel,
An outlet-side temperature sensor that measures the temperature on the outlet-side of the cold / hot water circulated through the radiant panel,
A flow rate sensor that measures the flow rate of cold and hot water distributed through the radiation panel,
The temperature of the air conditioning target space measured by the room temperature sensor, the temperature of cold / hot water measured by the inlet side temperature sensor, the temperature of cold / hot water measured by the outlet side temperature sensor, and the temperature of cold / hot water measured by the flow sensor. A load prediction means for predicting the load from the flow rate of cold and hot water to be generated, a heat balance model in the air-conditioned space where the radiation panel is installed, and
A target operating temperature setting means for setting a target living room operating temperature of the air-conditioned space, and
A temperature controller that controls the temperature of cold and hot water distributed through the radiant panel,
A command value for the temperature controller is determined from the load predicted by the load predicting means, the target living room working temperature set by the target working temperature setting means, and the flow rate of cold / hot water measured by the flow rate sensor. With the main controller
A radiant air conditioning system characterized by having. The radiant air-conditioning system according to any one of claims 1 to 4, wherein the radiant panel is installed on the ceiling of the air-conditioned space.

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