JP2015206508A - ventilation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce energy consumption in a ventilation system.SOLUTION: A ventilation system S performs ventilation of a kitchen 10 including a kitchen apparatuses 20A-20C. The ventilation system S includes: humidity sensors 41 and 43 for detecting humidity in the kitchen; infrared sensors 21A-21C for detecting a temperature in the kitchen; an exhaust fan 71; and a control section 105. The control section 105 estimates an exhaust load Q of the kitchen 10 on the basis of outputs of the humidity sensors 41 and 43 and outputs of the infrared sensors 21A-21C, and controls displacement of the exhaust fan 71 on the basis of the estimated exhaust load Q.

Description

  The present invention relates to a technique for controlling a ventilation amount in a kitchen.

  Japanese Patent Application Laid-Open Publication No. 2003-228667 describes that each cooker is detected based on the output information of the temperature sensor, and the inside of the kitchen is ventilated according to the operation status of the cooker.

JP 2006-200817 A

According to said technique, the ventilation amount of a kitchen can be controlled according to the operating condition of a cooking appliance. However, the exhaust load amount of the kitchen differs depending on the cooking contents and the situation. In order to reduce the energy consumption of the ventilation system, it is preferable to minimize the ventilation amount, and there is room for further improvement.
This invention is completed based on the above situations, Comprising: It aims at reducing the energy usage-amount of a ventilation system.

  The present invention is a ventilation system for ventilating a kitchen in which kitchen equipment is installed, the humidity sensor for detecting the humidity in the kitchen, the temperature sensor for detecting the temperature in the kitchen, an exhaust fan, and a control The controller is configured to estimate an exhaust load amount of the kitchen based on an output of the humidity sensor and an output of the temperature sensor, and based on the estimated exhaust load amount of the exhaust fan. Control the displacement. The “kitchen exhaust load amount” includes “exhaust load amount around kitchen equipment”, “exhaust load amount around ceiling exhaust section”, and the like. Further, the “exhaust load amount” refers to a heat load amount that needs to be exhausted in order to keep “temperature” and “humidity” in the kitchen at appropriate levels.

  In this configuration, the exhaust load amount of the kitchen is estimated from the outputs of the humidity sensor and the temperature sensor, and the exhaust amount of the exhaust fan is controlled. For this reason, it is possible to reduce the power consumption of the ventilation system. Further, since the exhaust load amount of the kitchen is estimated based on “temperature” and “humidity”, the exhaust load amount of the kitchen can be accurately estimated as compared with the case of estimating from the information of only “temperature” or “humidity”. .

The following configuration is preferable as an embodiment of the present invention.
A hood provided corresponding to the kitchen device, a ceiling exhaust part provided on the ceiling of the kitchen, an exhaust duct in which the hood and the ceiling exhaust part are connected in common, and provided in the exhaust duct The exhaust fan, the humidity sensor for detecting the humidity in the hood, and an infrared sensor as the temperature sensor for detecting the temperature of the kitchen appliance or cooking container, and the control unit includes the humidity sensor The exhaust load amount around the kitchen device is estimated based on the output of the infrared sensor and the output of the infrared sensor, and the exhaust amount of the exhaust fan is controlled based on the estimated exhaust load amount.

A hood provided corresponding to the kitchen device, a ceiling exhaust part provided on the ceiling of the kitchen, a first exhaust duct connected to the hood, and a second exhaust connected to the ceiling exhaust part A duct, a first exhaust fan provided in the first exhaust duct and having a fixed rotational speed, a second exhaust fan provided in the second exhaust duct and having a variable rotational speed, and the ceiling exhaust section. The humidity sensor attached, and the temperature sensor attached to the ceiling exhaust part, and the control unit is based on the output of the humidity sensor and the output of the temperature sensor, around the ceiling exhaust part And the exhaust amount of the second exhaust fan is controlled based on the estimated exhaust load amount.

The control unit estimates an exhaust load amount of the kitchen based on a logical sum of a temperature condition expression related to a detection value of the temperature sensor and a humidity condition expression related to a detection value of the humidity sensor.

  According to the present invention, the energy consumption of the ventilation system can be reduced.

Block diagram of a ventilation system according to the first embodiment Diagram showing correlation table Flow chart of ventilation flow Block diagram of ventilation system according to Embodiment 2 Diagram showing correlation table Flowchart diagram of ventilation flow according to Embodiment 3 Block diagram of a ventilation system according to another embodiment

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS.
1. Configuration of Ventilation System S As shown in FIG. 1, the kitchen 10 is provided with three kitchen devices, a kitchen device 20A, a kitchen device 20B, and a kitchen device 20C. Kitchen appliances 20A to 20C are all cooking appliances that do not involve combustion, and specifically, are electric appliances and steam-use kitchen appliances. Specifically, the kitchen device 20A is an IH device, the kitchen 20B is a flyer, and both the kitchen devices 20A and 20B are arranged side by side. Further, the kitchen device 20C is a boiled noodle device, and is disposed apart from the kitchen devices 20A and 20B.

  As shown in FIG. 1, the ventilation system S includes a first hood 31, a second hood 33, a ceiling exhaust part 35, an exhaust duct 60, an exhaust fan 71, an inverter 75, an air supply fan 81, An inverter 85, an infrared sensor (an example of the “temperature sensor” of the present invention) 21, humidity sensors 41 to 47, humidity sensors 55 and 57, and a controller 100 are provided.

  The first hood 31 is provided corresponding to the kitchen devices 20A and 20B. The 1st food | hood 31 is a magnitude | size which covers both kitchen appliances 20A and 20B, and is provided above both kitchen appliances 20A and 20B. The first hood 31 is formed with an exhaust passage for discharging heat and steam generated from the kitchen devices 20 </ b> A and 20 </ b> B to the exhaust duct 60.

  The second hood 33 is provided corresponding to the kitchen device 20C. The second hood 33 is sized to cover the kitchen device 20C, and is provided above the kitchen device 20C. The second hood 33 is formed with an exhaust passage for exhausting heat and steam generated in the kitchen device 20 </ b> C to the exhaust duct 60. The ceiling exhaust part 35 is provided on the ceiling of the kitchen 10. An exhaust passage for discharging the air in the kitchen 10 to the exhaust duct 60 is formed in the ceiling exhaust part 35.

  As shown in FIG. 1, a first hood 31, a second hood 33, and a ceiling exhaust part 35 are connected in common to the exhaust duct 60, and an exhaust fan 71 is provided at the outlet. Therefore, when the exhaust fan 71 is driven, air is taken in from the first hood 31 and the second hood 33, and “heat” and “steam” generated in each kitchen device 20 </ b> A to 20 </ b> C can be discharged to the outside through the exhaust duct 60. . Further, air near the ceiling can be discharged to the outside through the ceiling exhaust part 35 and the exhaust duct 60.

  Three infrared sensors 21, 21A to 21C, are provided corresponding to the three kitchen devices 20A to 20C. The infrared sensor 21A is attached to the hood 31 and detects the surface temperature Tr [° C.] of the cooking container exemplified by the kitchen device 20A and a pan placed on the kitchen device 20A. The infrared sensor 21B is attached to the hood 31 and detects the surface temperature Tr [° C.] of the kitchen device 20B. The infrared sensor 21C is attached to the hood 33 and detects the surface temperature Tr [° C.] of the kitchen device 20C. The output lines of the infrared sensors 21A to 21C are connected to the input unit 101 of the controller 100, and the detection values Tr of the infrared sensors 21A to 21C are taken into the controller 100.

  The humidity sensor 41 is provided in the first hood 31 and detects the absolute humidity X [g / Kg] in the first hood 31. The humidity sensor 43 is provided in the second hood 33 and detects the absolute humidity X [g / Kg] in the second hood 33. The humidity sensor 47 is provided at a representative point of the kitchen 10 (for example, the upper part of the wall surface), and detects the absolute humidity Xo [g / Kg] of the representative point of the kitchen 10. The output lines of these humidity sensors 41, 43, 47 are connected to the input unit 101 of the controller 100, and the detection values X, Xo of the first humidity sensors 41, 43, 45 are taken into the controller 100. It has become.

  The humidity sensor 55 is provided in the ceiling exhaust part 35 and detects the relative humidity H [% RH] in the ceiling exhaust part 35. The humidity sensor 57 is provided at a representative point (for example, the upper part of the wall surface) of the kitchen 10 and detects the relative humidity Ho [% RH] of the representative point of the kitchen 10. The output lines of the humidity sensors 55 and 57 are connected to the input unit 101 of the controller 100, and the detection values H and Ho of the humidity sensors 55 and 57 are taken into the controller 100.

  The controller 100 includes an input unit 101, a storage unit 103, and a control unit 105. As shown in FIG. 1, inverters 75 and 85 are electrically connected to the control unit 105, and the control unit 105 gives commands to the inverters 75 and 85, so that the exhaust fan 71 and the air supply fan 81 are controlled. Rotational speed V is controlled. The control unit 105 controls the exhaust fan 71 and the air supply fan 81 in conjunction with each other so that the exhaust amount and the air supply amount become equal. That is, control is performed so that the rotational speeds V of the two fans 71 and 81 are always equal. Further, the storage unit 103 stores data for estimating the exhaust load amount Q based on the information on the “temperature” and “humidity” of the kitchen 10 (in this example, data of the correlation table shown in FIG. 2). ing.

2. Estimating the exhaust load Q in the kitchen 10 The purpose of ventilation is to discharge the "heat" and "steam" generated in the kitchen equipment so that the person who cooks in the kitchen 10 can work safely and comfortably. Thus, the temperature in the kitchen 10 is adjusted by taking in the corresponding air (temperature and humidity are adjusted as necessary). Since a large amount of energy is required to produce a large amount of air whose temperature (or humidity in some cases) is adjusted, the amount of ventilation (exhaust gas) can be reduced to reduce the energy used, including the ventilation system S and the accompanying air conditioning. It is preferable to suppress the general name of the amount and the air supply amount. In this ventilation system S, since the exhaust air from the exhaust fan 71 is supplied by the air supply fan 81, if the exhaust amount of the exhaust fan 71 can be suppressed, the ventilation amount can be suppressed and the energy used is reduced. I can do it. And it can also reduce air conditioning energy.

  Therefore, in the ventilation system S, the exhaust load amount Q around each kitchen device is estimated based on the temperature information obtained from the infrared sensors 21A to 21C and the humidity information obtained from the humidity sensors 41, 43, and 47. Based on the estimated exhaust load amount Q, the exhaust amount of the exhaust fan 71 is controlled. The “exhaust load amount” refers to a heat load [W] that needs to be exhausted in order to maintain “temperature” and “humidity” in the kitchen at appropriate levels.

  If it demonstrates concretely, as shown in FIG. 2, this ventilation system S will provide the two correlation tables according to the type of kitchen equipment. Type 1 is a device having a kettle load, and in this example, a kitchen device (IH device) 20A and a kitchen device (boiled noodle device) 20C are applicable. Type 2 is a device without a kettle load, and in this example, a kitchen device (flyer) 20B is applicable.

  The correlation table estimates the level of the exhaust load amount Q in multiple stages by the logical sum (OR) of the temperature conditional expression and the humidity conditional expression. For example, in the case of Type 1, the temperature conditional expression has three patterns of the following expressions (1) to (3), and the humidity conditional expression has two patterns of the following expressions (4) and (5).

Tr <Tc1 (1)
Tc1 ≦ Tr ≦ Tc2 (2)
Tc2 <Tr (3)
Tr: Detection value of infrared sensors 21A and 21C [° C.]
Tc1, Tc2: constant [° C.]

(X−Xo) ≦ Xc (4)
(X-Xo)> Xc (5)
X: Detected value [g / Kg] of humidity sensors 41 and 43 provided in each hood
Xo: detected value [g / Kg] of the humidity sensor 47 provided at the representative point of the kitchen
Xc: Constant [g / Kg]

  According to the type 1 correlation table, as shown in FIG. 2, when the temperature conditional expression (1) is satisfied, the exhaust load amount Q is estimated to be “none”. Further, when either the temperature conditional expression (2) or the humidity conditional expression (4) is satisfied, the exhaust load amount Q is estimated to be “small”. Further, when either the temperature conditional expression (3) or the humidity conditional expression (5) is satisfied, the exhaust load amount Q is estimated to be “large”.

  In the case of type 2, there are two patterns of temperature conditional expressions (6) and (7) below, and there are two patterns of humidity conditional expressions (4) and (5) described above.

Tr <Tc3 (6)
Tc3 ≦ Tr (7)
Tr: Detection value of infrared sensor 21B [° C.]
Tc3: Constant [° C.]

  According to the type 2 correlation table, as shown in FIG. 2, when the temperature conditional expression (6) is satisfied, the exhaust load amount Q is estimated to be “none”. When the humidity conditional expression (4) is satisfied, the exhaust load amount Q is estimated to be “small”. Further, when either the temperature conditional expression (7) or the humidity conditional expression (5) is satisfied, the exhaust load amount Q is estimated to be “large”.

  In this ventilation system S, the exhaust load amount Q around the kitchen device is estimated for each of the kitchen devices 20A to 20C from the correlation table of FIG. Then, the maximum exhaust load amount Q is selected from the estimation result, and the rotational speed V of the exhaust fan 71 is determined based on the selected exhaust load amount Q. That is, when the maximum exhaust load Q is “none”, the exhaust fan 71 is driven at “low speed” to perform exhaust, and when the maximum exhaust load Q is “small”, the exhaust fan 71 is set to “medium”. Drive at "speed" to exhaust. When the maximum exhaust load amount Q is “large”, exhaust is performed by driving the exhaust fan 71 at “high speed”.

  Since the rotational speed V and the exhaust amount are in a proportional relationship, the exhaust amount of the exhaust fan 71 can be adjusted in multiple stages according to the exhaust load amount Q by switching the rotational speed V according to the exhaust load amount Q. I can do it. Therefore, the energy used by the ventilation system S can be reduced, and at the same time the air conditioning energy can be reduced.

  Moreover, in the ventilation system S, the exhaust load amount Q is estimated by the logical sum of the temperature condition equation and the humidity condition equation. Therefore, it is possible to estimate an appropriate exhaust load amount Q in consideration of both “heat” and “steam” generated from the kitchen devices 20A to 20C. For example, when cooking fried food with a fryer, even if the surface temperature change is small, large latent heat is generated from the object to be cooked, which may occupy the majority of the load. By using together, the exhaust load amount Q can be estimated appropriately.

  Next, the ventilation flow will be described. As shown in FIG. 3, the ventilation flow includes 10 steps S <b> 10 to S <b> 100 and is executed by the control unit 105 of the controller 100. The ventilation flow is started when the ventilation system S is activated.

  When the ventilation flow starts, the process first proceeds to S10, and the control unit 105 determines whether the fan switch is “ON”. The fan switch is a switch for driving the exhaust fan 71 and the air supply fan 81.

  When the worker turns on the fan switch as the cooking operation starts in the kitchen, the control unit 105 detects that the fan switch is “ON”. Thereafter, the process proceeds to S20, and the control unit 105 monitors the outputs of the infrared sensors 21A to 21C, the outputs of the humidity sensors 41, 43, and 47, and the outputs of the humidity sensors 55 and 57 (monitoring start).

  Subsequently, the process proceeds to S <b> 30, and the control unit 105 gives an instruction to each of the inverters 75 and 85 to start the operation of the exhaust fan 71 and the supply fan 81 with initial values. In this example, the rotational speed V of the exhaust fan 71 and the air supply fan 81 can be adjusted in four stages of “low speed”, “medium speed”, “high speed”, and “highest speed”. Since the maximum speed is set, after the fan switch is turned on, the exhaust fan 71 and the air supply fan 81 rotate at the “highest speed”.

  Then, after a predetermined time has elapsed after the operation of the exhaust fan 71 and the air supply fan 81 is started, the process proceeds to S40. When the process proceeds to S40, the control unit 105 determines each kitchen apparatus 20A to 20C based on the outputs (detection values Tr) of the infrared sensors 21A to 21C and the outputs (detection values X) of the humidity sensors 41, 43, and 47. The exhaust load amount Q is estimated.

  Specifically, the exhaust load amount Q around the kitchen device 20A is estimated based on the detection value Tr of the infrared sensor 21A and the detection value X of the humidity sensor 41. Further, the exhaust load amount Q around the kitchen device 20B is estimated based on the detection value Tr of the infrared sensor 21B and the detection value X of the humidity sensor 41. Further, the exhaust load amount Q around the kitchen device 20C is estimated based on the detection value Tr of the infrared sensor 21C and the detection value X of the humidity sensor 43. The method for estimating the exhaust load amount Q follows the correlation table of FIG.

  And if the exhaust load amount Q of each kitchen apparatus 20A-20C is estimated, a process will transfer to S50 and the control part 105 will determine the rotational speed V of the exhaust fan 71 and the air supply fan 81. FIG. Specifically, the rotational speed V is determined according to the maximum exhaust load amount Q among the kitchen devices 20A to 20C.

  For example, when the exhaust load amount Q around the kitchen device 20A is “none”, the exhaust load amount Q around the kitchen device 20B is “small”, and the exhaust load amount Q around the kitchen device 20C is “large”, the maximum exhaust load Since the amount Q is “large”, the rotational speed V of the exhaust fan 71 and the supply fan 81 is determined to be “high speed”.

  Thereafter, the control unit 105 gives a command to the inverters 75 and 85 to switch the rotational speed V of the exhaust fan 71 and the air supply fan 81 to “high speed”. The rotational speed V and the air volume of the fan are in a proportional relationship. Therefore, by switching the rotation speed V, the exhaust amount of the exhaust fan 71 and the supply amount of the supply fan 81 are switched to an amount corresponding to the maximum exhaust load amount Q.

  Then, after a predetermined time has elapsed after the rotation speed V is switched, the process proceeds to S60. If transfering to S60, the control part 105 will compare the relative humidity H of the ceiling exhaust part 35 detected by the humidity sensor 55 with the threshold value (upper limit value of relative humidity) Hmax. The process of S60 is provided to determine whether the relative humidity of the ceiling exhaust part 35 does not exceed the upper limit. If the relative humidity H does not exceed the upper limit, NO is determined in S60.

  If NO is determined in S60, then the process proceeds to S70. In S70, the control unit 105 determines whether the fan switch is “OFF”. If the fan switch is not “OFF”, the process returns to S40. Therefore, when the relative temperature H at the ceiling exhaust part 35 is smaller than the threshold value Hmax and the fan switch is not “OFF”, the loop R1 shown in FIG. 3 is repeated.

  And if the exhaust load amount Q of each kitchen appliance 20A-20C changes while the control part 105 repeats the process of loop R1, the process of S40 and S50 will be performed and the rotational speed V will switch. The exhaust amount of the exhaust fan 71 and the supply amount of the supply fan 81 are automatically adjusted according to the maximum exhaust load amount Q of each kitchen device 20A to 20C.

  Thereafter, when the operator turns off the fan switch when cooking is completed, the determination is YES when the determination process of S70 is performed. Thereafter, the process proceeds to S100, and the control unit 105 instructs the inverters 75 and 85 to stop the exhaust fan 71 and the supply fan 81. This ends the ventilation flow.

  On the other hand, even if the exhaust amount of the exhaust fan 71 and the supply amount of the air supply fan 81 are automatically adjusted, if the relative humidity H of the ceiling exhaust part 35 exceeds the upper limit (when the load is larger than estimated), S60. YES, the process proceeds to S80.

  In S80, the control unit 105 gives a command to each of the inverters 75 and 85 to increase the rotational speed V of the exhaust fan 71 and the supply fan 81. As a result, exhaust by the exhaust fan 71 and supply by the supply fan 81 are increased, so that the interior of the kitchen 10 is further ventilated. The increase in the rotation speed V performed in S80 is a fine adjustment of the rotation speed V. For example, when the rotation speed is initially "high speed", the rotation speed V slightly increases from the high speed.

  Thereafter, the process proceeds to S90, and a process for determining whether the fan switch is “OFF” is performed by the control unit 105. If the fan switch is not “OFF”, the process proceeds to S60 to detect the relative humidity detected by the humidity sensor 55. It is determined again whether H is equal to or greater than the threshold value Hmax. If the relative humidity H of the ceiling exhaust part 35 falls below the upper limit due to an increase in the ventilation amount, a NO determination is made in S60, and the process proceeds to S70.

  On the other hand, if the relative humidity H of the ceiling exhaust part 35 exceeds the upper limit even if the ventilation amount is increased, the process proceeds to S80 again, and the process of increasing the rotational speed V of the exhaust fan 71 and the air supply fan 81 is performed. Done. Therefore, the rotational speed V of the exhaust fan 71 and the air supply fan 81 is increased until the relative humidity H of the ceiling exhaust part 35 falls below the upper limit. If the relative humidity H of the ceiling exhaust part 35 falls below the upper limit due to an increase in the ventilation volume (exhaust volume and supply air volume), a NO determination is made in S60, and the process proceeds to S70.

  From the above, for some reason, when the relative humidity H of the ceiling exhaust part 35 exceeds the upper limit, the ventilation amount is adjusted to increase, so the humidity of the kitchen 10 is lowered to an appropriate level. I can do it.

3. Explanation of Effects As described above, the ventilation system S switches the exhaust amount of the exhaust fan 71 and the supply amount of the supply fan 81 according to the exhaust load amount Q generated in the kitchen devices 20A to 20C. Therefore, the energy used by the ventilation system S can be reduced, and at the same time the air conditioning energy can be reduced. The ventilation system S uses infrared sensors 21A to 21C for temperature detection of the kitchen devices 20A to 20C. The infrared sensors 21A to 21C can control the heat load even when there is mechanical input, even when the pan where the kitchen equipment is placed is cold, or even when there is no mechanical input and hot water is held on the spot. It can be detected properly. Therefore, ventilation can be performed in accordance with the actual generation timing of the heat load, which is effective.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.
The ventilation system S of the second embodiment is different from the first embodiment in the configuration of the exhaust duct, and is provided with a first exhaust duct 121 and a second exhaust duct 131 as shown in FIG. A first hood 31 and a second hood 33 are commonly connected to the first exhaust duct 121. A first exhaust fan 125 is provided at the duct outlet. The first exhaust fan 125 is a fan whose rotational speed is fixed.

  On the other hand, a ceiling exhaust part 35 is connected to the second exhaust duct 131. A second exhaust fan 141 is provided at the duct outlet. The second exhaust fan 141 is a fan whose rotational speed is variable by the inverter 145.

  The ventilation system S of the second embodiment includes two temperature sensors 151 and 153, two humidity sensors 161 and 163, and a controller 100. The temperature sensor 151 is provided in the ceiling exhaust part 35 and detects the ambient temperature T [° C.] of the ceiling exhaust part 35. The temperature sensor 153 is provided at a representative point of the kitchen 10 (for example, the upper part of the wall surface), and detects the ambient temperature To [° C.] at the representative point of the kitchen 10. The output lines of these temperature sensors 151 and 153 are connected to the input unit 101 of the controller 100, and the detection values T and To of the temperature sensors 151 and 153 are taken into the controller 100.

  The humidity sensor 161 is provided in the ceiling exhaust part 35 and detects the relative humidity H [% RH] of the ceiling exhaust part 35. The humidity sensor 163 is provided at a representative point (for example, the upper part of the wall surface) of the kitchen 10 and detects the relative humidity Ho [% RH] of the representative point of the kitchen 10. The output lines of these humidity sensors 161 and 163 are connected to the input unit 101 of the controller 100, and the detected values H and Ho of the humidity sensors 161 and 163 are taken into the controller 100.

  The controller 100 includes an input unit 101, a storage unit 103, and a control unit 105. As shown in FIG. 4, inverters 145 and 85 are electrically connected to the control unit 105, and the control unit 105 gives commands to the inverters 145 and 85, so that the exhaust fan 141 and the air supply fan 81 are controlled. Rotational speed V is controlled. The control unit 105 controls the supply fan 81 to the second exhaust fan 141 so that the exhaust amount (the total exhaust amount of the first exhaust fan 125 and the total exhaust amount of the second exhaust fan 141) is equal to the supply amount. Control in conjunction with.

  The ventilation system S according to the second embodiment operates the first exhaust fan 125 so that “heat” and “steam” generated in each kitchen device 20 </ b> A to 20 </ b> C are passed through the hoods 31 and 33 and the first exhaust duct 121. It is structured to exhaust outside. However, since the first exhaust fan 125 has a fixed rotational speed, the amount of load (“heat” or “steam”) generated in each kitchen device 20A to 20C is the amount of exhaust from the first exhaust fan 125. “Heat” and “steam” that cannot be exhausted may remain in the kitchen 10. Therefore, such residual components are exhausted to the outside through the ceiling exhaust part 35 and the second exhaust duct 131 on the second exhaust fan 141 side.

  In the ventilation system S of the second embodiment, the ceiling is based on the ambient temperature T of the ceiling exhaust part 35 detected by the temperature sensor 151 and the humidity H of the ceiling exhaust part 35 detected by the humidity sensor 161. The exhaust load amount Q around the exhaust section is estimated, and the rotational speed V of the second exhaust fan 141 is switched based on the estimated exhaust load amount Q to control the exhaust amount of the exhaust fan 141. Therefore, as in the first embodiment, the energy used by the ventilation system S can be reduced, and at the same time the air conditioning energy can be reduced.

  The exhaust load amount Q around the ceiling exhaust part is estimated based on the logical sum of the temperature condition equation and the humidity condition equation as shown in FIG. Note that “Tc4” and “Tc5” shown in FIG. 5 are constants. “Hc1” and “Hc2” are also constants.

  Further, when comparing the ventilation system S of the first embodiment and the second embodiment, the ventilation system S of the first embodiment has a system configuration with only one exhaust fan, so it is somewhat inexpensive, but the exhaust load around each kitchen device Since the exhaust amount of the exhaust fan is determined according to the maximum exhaust load amount among the amounts, the exhaust amount becomes slightly larger. On the other hand, the ventilation system S of the second embodiment is more expensive than the ventilation system S of the first embodiment because there are two exhaust fans. However, since the shortage of the exhaust amount is adjusted at the ceiling exhaust part, the exhaust amount can be reduced as compared with the ventilation system of the first embodiment.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG.
The ventilation system S of the third embodiment is partially different from the ventilation system S of the second embodiment in the control content of the exhaust fan and the air supply fan.
In the ventilation system S of the third embodiment, when the worker turns on the fan switch as the cooking operation starts in the kitchen, first, the exhaust fan 125 is driven, and each kitchen device 20A is driven through the hoods 31 and 33. Air around ~ 20C is exhausted.

  On the other hand, the control unit 105 starts the control flow shown in FIG. 6 and, after detecting the switching of the fan switch, gives a command to the inverters 145 and 85, and sets the supply fan 81 and the second exhaust fan 141 to the initial values (for example, The operation is started at “medium speed” (or “highest speed”) (S210 to S230).

Then, the control part 105 performs the process which compares the relative humidity H of the ceiling exhaust part 35 detected by the humidity sensor 161 with threshold value (upper limit value of relative humidity) Hmax (S240).
H ≧ Hmax (8)

  When the relative humidity H is equal to or higher than the threshold Hmax (when Expression 8 is satisfied), the control unit 105 estimates that the exhaust load amount Q around the ceiling exhaust unit is “large” and gives a command to the inverters 145 and 85. Then, the rotational speed V of the air supply fan 81 and the second exhaust fan 141 is increased (S260, S270).

On the other hand, when the relative humidity H is lower than the threshold value Hmax (when Expression 8 is not satisfied), the control unit 105 determines the ambient temperature T of the ceiling exhaust unit 35 and the ambient temperature of the kitchen representative point from the outputs of the temperature sensors 151 and 161. A temperature difference (T-To) of To is obtained, and it is determined whether the obtained temperature difference (T-To) is greater than or equal to a threshold value Tc (S250).
T-To ≧ Tc (9) formula

  When the temperature difference (T−To) is equal to or greater than the threshold value Tc (when Equation 9 is satisfied), the control unit 105 estimates that the exhaust load amount Q around the ceiling exhaust unit is “large” and causes the inverters 85 and 145 to A command is given to increase the rotational speed V of the air supply fan 81 and the second exhaust fan 141 (S260, S270).

  On the other hand, when the temperature difference (T-To) is smaller than the threshold value Tc (when Expression 9 is not satisfied), the control unit 105 estimates that the exhaust load amount Q around the ceiling exhaust unit is “small”, and the inverter 85, A command is given to 145 to reduce the rotational speed V of the air supply fan 81 and the second exhaust fan 141 (S280, S290).

  Then, after adjusting the rotation speed V, the control unit 105 determines whether the fan switch is “OFF” (S300). When the fan switch is “OFF”, the process proceeds to S240. On the other hand, when the fan switch is “OFF”, the process proceeds to S <b> 310, and the control unit 105 gives an instruction to each of the inverters 85 and 145 to stop the air supply fan 81 and the second exhaust fan 141.

  The ventilation system S of the third embodiment estimates the exhaust load amount Q around the ceiling exhaust part by the logical sum of the humidity condition expression shown in the expression (8) and the temperature condition expression shown in the expression (9). Then, the rotational speed V of the second exhaust fan 141 is switched based on the estimated exhaust load amount Q. Therefore, as in the first and second embodiments, the energy used by the ventilation system S can be reduced, and at the same time the air conditioning energy can be reduced.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the ventilation system S of the first embodiment, the exhaust amount cannot be adjusted for each hood. For example, as shown in FIG. The dampers 310 and 320 may be provided so that the exhaust amount can be individually adjusted for each hood. When the exhaust amount can be adjusted for each hood, the air volume of the exhaust fan 71 is adjusted so that the total amount of each exhaust load Q generated in each kitchen device 20A to 20C is exhausted, and each damper By adjusting the opening degree of 310, 320, the exhaust amount of each hood 31, 33 is set according to the exhaust load amount Q of each kitchen device 20A-20C. By doing in this way, although it becomes an expensive system, it becomes possible to ventilate efficiently, the energy used of the ventilation system S can be reduced, and air-conditioning energy can also be reduced simultaneously.

  (2) In addition, the method for estimating the exhaust load Q described in the first to third embodiments is merely an example, and any other method may be used as long as it is based on “humidity” information in the kitchen and “temperature” information. Is also applicable.

  (3) Embodiments 1 to 3 show an example in which the hoods 31 and 33 are provided as an example of the ventilation system. However, the ventilation system without the hoods 31 and 33, for example, a configuration in which exhaust is performed by a plurality of ceiling exhaust units. (School lunch center etc.) In addition, in the case of a configuration in which a plurality of ceiling exhaust parts are provided, a temperature sensor (including an infrared sensor) or a humidity sensor is attached to the ceiling exhaust part, which is expected to require the most ventilation, such as around kitchen equipment. A ventilation load amount in the kitchen may be estimated based on the obtained detection value.

  In the first to third embodiments, the ventilation system provided with the exhaust ducts 60, 121, and 131 is illustrated. However, when ventilation is performed with an exhaust fan provided on the wall surface of the kitchen 10, the exhaust duct can be eliminated. Is

DESCRIPTION OF SYMBOLS 10 ... Kitchen 20A-20C ... Kitchen equipment 21A-21C ... Infrared sensor (an example of "temperature sensor" of the present invention)
31, 33 ... Hood 35 ... Ceiling exhaust part 41, 43, 47 ... Humidity sensor 55, 57 ... Humidity sensor 60 ... Exhaust duct 71 ... Exhaust fan 75 ... Inverter 81 ... Air supply fan 85 ... Inverter 100 ... Controller 105 ... Control part S ... Ventilation system

Claims (4)

A ventilation system for ventilating a kitchen in which kitchen equipment is installed,
A humidity sensor for detecting humidity in the kitchen;
A temperature sensor for detecting the temperature in the kitchen;
An exhaust fan,
A control unit,
The controller is
Based on the output of the humidity sensor and the output of the temperature sensor, the exhaust load amount of the kitchen is estimated,
A ventilation system for controlling an exhaust amount of the exhaust fan based on the estimated exhaust load amount. A hood provided corresponding to the kitchen equipment;
A ceiling exhaust provided on the ceiling of the kitchen;
An exhaust duct in which the hood and the ceiling exhaust part are connected in common;
The exhaust fan provided in the exhaust duct;
The humidity sensor for detecting humidity in the hood;
An infrared sensor as the temperature sensor for detecting the temperature of the kitchen device or cooking vessel,
The control unit estimates an exhaust load amount around the kitchen device based on the output of the humidity sensor and the output of the infrared sensor,
The ventilation system according to claim 1, wherein an exhaust amount of the exhaust fan is controlled based on the estimated exhaust load amount. A hood provided corresponding to the kitchen equipment;
A ceiling exhaust provided on the ceiling of the kitchen;
A first exhaust duct to which the hood is connected;
A second exhaust duct to which the ceiling exhaust part is connected;
A first exhaust fan provided in the first exhaust duct and having a fixed rotational speed;
A second exhaust fan provided in the second exhaust duct and having a variable rotational speed;
The humidity sensor attached to the ceiling exhaust,
The temperature sensor attached to the ceiling exhaust part,
The control unit estimates an exhaust load amount around the ceiling exhaust unit based on the output of the humidity sensor and the output of the temperature sensor,
The ventilation system according to claim 1, wherein an exhaust amount of the second exhaust fan is controlled based on the estimated exhaust load amount.   The control unit estimates an exhaust load amount of the kitchen based on a logical sum of a temperature condition expression related to a detection value of the temperature sensor and a humidity condition expression related to a detection value of the humidity sensor. The ventilation system according to any one of the above.

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