JP2015040643A - Ice sheet temperature management system and ice sheet temperature management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ice sheet management system and an ice sheet management method capable of always maintaining an ice sheet in an appropriate state.SOLUTION: An ice sheet management system includes: a brine cooler 16 cooling a cooling medium; a cooling pipe 12 that is arranged on a bottom of an ice sheet 18 and in which the cooling medium flows; a flow volume adjustment unit 14 that can adjust a flow volume of the cooling medium flowing to the cooling pipe 12; and a controller 24. The controller 24 controls the flow volume adjustment unit 14 so that a heat quantity of cold flowing from the cooling pipe 12 in the ice sheet 18 can match a heat quantity of cold flowing from a surface layer portion of the ice sheet 18 out into the atmosphere.

Description

  The present invention relates to an ice sheet temperature management system and an ice sheet temperature management method.

  Ice skating rinks are used for various competitions such as figure skating, short track, and ice hockey. There are optimum ice sheet temperatures depending on the type of competition. For example, a soft ice sheet with a temperature of −4 ° C. to −3 ° C. is preferable for figure skating, and a hard ice sheet with a temperature of −6 ° C. to −5 ° C. is preferable for a short track. An ice sheet at an intermediate temperature is preferred for hockey.

  In order for athletes to achieve high performance, it is desirable that the ice sheet temperature be uniform across the ice rink.

  In a general artificial ice skating rink, a cooling medium called brine cooled by a brine cooler is caused to flow through cooling piping arranged below the ice sheet. Then, the ice sheet temperature is measured using a temperature sensor, and the supply amount of brine is controlled so that the ice sheet temperature becomes the target temperature.

WO2010 / 125712 JP 2000-81262 A JP-A-9-303920

  An object of the present invention is to provide an ice sheet temperature management system and an ice sheet temperature management method capable of always maintaining an ice sheet in an appropriate state.

  According to one aspect of the disclosed technology, a brine cooler that cools a cooling medium, a cooling pipe that is disposed at the bottom of an ice sheet and through which the cooling medium flows, and a flow rate of the cooling medium that flows through the cooling pipe are adjusted. And a control for controlling the flow rate adjusting unit so that a heat quantity of the cold heat flowing into the ice sheet from the cooling pipe and a heat quantity of the cold heat flowing into the atmosphere from the surface layer part of the ice sheet coincide with each other. An ice sheet temperature management system is provided.

  According to another aspect of the disclosed technology, the step of detecting the temperature of the bottom of the ice sheet, the temperature of the intermediate part, and the temperature of the surface layer part in which the cooling pipe through which the cooling medium flows is arranged at the bottom, Based on the temperature of the bottom of the ice sheet, the temperature of the middle part, and the temperature of the surface layer part, the amount of cold heat flowing into the ice sheet from the cooling pipe and the amount of heat of cold heat flowing out from the surface layer part into the atmosphere are controlled by a control device. An ice sheet temperature management method is provided that includes a step of calculating, and a step of adjusting a flow rate of the cooling medium flowing in the cooling pipe by controlling a flow rate adjusting unit based on a calculation result of the amount of heat of the cold.

  According to the ice sheet temperature management system and the ice sheet temperature management method according to one aspect of the above disclosure, the ice sheet can always be maintained in an appropriate state.

FIG. 1 is a schematic configuration diagram of an ice sheet temperature management system according to an embodiment. FIG. 2 is a cross-sectional view of the ice sheet. FIG. 3 is a flowchart for explaining an ice sheet temperature management method by the ice sheet temperature management system according to the embodiment. FIG. 4 is a schematic cross-sectional view of an ice sheet for explaining the amount of cold heat flowing into the ice sheet from the cooling pipe and the amount of cold heat flowing into the atmosphere from the surface layer portion of the ice sheet.

  Hereinafter, before describing the embodiment, a preliminary matter for facilitating understanding of the embodiment will be described.

  In an ice skating rink (hereinafter simply referred to as “skating rink”), the heat load applied to the ice sheet varies depending on the location. For example, the heat load on the ice sheet becomes high near the entrance of the skating rink or in a place where the density of the audience is high. In addition, if it is indoors, the heat load on the place where the light or spotlight hits is high, and if it is outdoors, the heat load applied to the ice sheet differs depending on whether it is the sun or the sun.

  Furthermore, the place where the heat load is applied varies depending on the type of competition. For example, in speed skating, athletes are concentrated along the track, and in curling, athletes are concentrated in the center of the lane, so the heat load at the place where these athletes are concentrated increases.

  In conventional skating rinks, it is difficult to cope with different heat loads from place to place. Therefore, in a place where the heat load applied to the ice sheet is high, the ice sheet temperature becomes higher than the target temperature, and a water pool is generated in the ice sheet or the ice becomes easy to scrape. Further, in a place where the heat load applied to the ice sheet is low, the ice sheet temperature becomes lower than the target temperature, and the ice sheet is cracked or the edge of the skate becomes difficult to work.

  In the following embodiments, an ice sheet temperature management system and an ice sheet temperature management method that can always maintain an ice sheet in an appropriate state will be described.

(Embodiment)
FIG. 1 is a schematic configuration diagram of an ice sheet temperature management system according to an embodiment.

  The ice sheet temperature management system according to the present embodiment includes a refrigerator 15, a brine cooler 16, a brine tank 17, an optical fiber 21 serving as a temperature sensor, a temperature distribution measuring device (DTS) 22, and a calculating device 23. And a control device 24.

  Further, as shown in FIG. 1, the skating rink 11 is divided into n sections from a section 1 to a section n in a top view, and cooling pipes 12 through which brines are individually passed are arranged in each section. Yes.

  The refrigerator 15 is thermally connected to the brine cooler 16 and cools the brine passing through the brine cooler 16 to a temperature set in the control device 24. The brine tank 17 temporarily stores the brine before being supplied to the brine cooler 16.

  The brine supply port of the brine cooler 16 is connected to the brine supply pipe 13a. Further, the brine return pipe 13b is connected to the brine tank 17.

  One end side of each cooling pipe 12 laid in each section is connected to a brine supply pipe 13a, and the other end side is connected to a brine return pipe 13b via a flow rate adjusting valve 14.

  The control device 24 can individually control the flow rate of the brine flowing through each cooling pipe 12 by individually controlling the opening degrees of the flow rate adjusting valves 14. Brine is an example of a cooling medium, and the flow rate adjustment valve 14 is an example of a flow rate adjustment unit.

  By the way, in this embodiment, in order to measure the ice sheet temperature of each section of the skating rink 11, the optical fiber 21 is used.

  FIG. 2 is a schematic cross-sectional view of an ice sheet. As shown in FIG. 2, in the skating rink 11, a cooling pipe 12 is installed on the heat insulating material 20, and an ice sheet 18 is formed on the heat insulating material 20 and the cooling pipe 12.

  In the present embodiment, the optical fibers 21 are laid in three layers in order to individually measure the temperatures of the bottom, middle and surface layers of the ice sheet 18. That is, a part of one optical fiber 21 is laid on the bottom of the ice sheet 18 as the first layer optical fiber 21a, and the other part is laid on the middle part of the ice sheet 18 as the second layer optical fiber 21b. Further, another part is laid on the surface layer portion of the ice sheet 18 as the third layer as the optical fiber 21c. However, separate optical fibers may be laid on the bottom, middle and surface layers of the ice sheet 18 using three optical fibers.

  For example, water is sprayed over the entire area of the skating rink 11 while passing brine through the cooling pipe 12 to grow the ice sheet 18 until the cooling pipe 12 is filled, and the first-layer optical fiber 21a is formed thereon. Lay down. Thereafter, water is further sprayed over the entire area of the skating rink 11 to grow the ice sheet 18 to a desired thickness, and the second-layer optical fiber 21b is laid thereon.

  Next, water is further sprayed over the entire area of the skating rink 11 to grow the ice sheet 18 to a desired thickness, and a third-layer optical fiber 21c is laid thereon. Thereafter, water is further sprayed over the entire area of the skating rink 11 to grow the ice sheet 18 to a desired thickness. Each of the optical fibers 21a to 21c in each layer is laid so as to pass through all the sections.

  As shown in FIG. 1, both ends of the optical fiber 21 are connected to a temperature distribution measuring device 22.

  The temperature distribution measuring device 22 includes a laser light source and a light receiving unit. Laser light emitted from the laser light source enters the optical fiber 21 from the end of the optical fiber 21. The temperature distribution measuring device 22 detects the reflected light (Raman scattered light) generated when the laser light passes through the optical fiber 21 by the light receiving unit, and the length direction of the optical fiber 21 from the intensity and time of the reflected light. Get the temperature distribution of.

  The calculation device 23 performs correction calculation using a transfer function for the temperature distribution in the length direction of the optical fiber 21 output from the temperature distribution measurement device 22. Thereby, the temperature of the measurement point set at intervals of 10 cm to several tens of cm along the length direction of the optical fiber 21 can be detected with high accuracy. Details of correction calculation using a transfer function are described in Patent Document 1 and the like.

  The control device 24 stores data on the laid state of the optical fiber 21, and the position of the measurement point in the length direction of the optical fiber 21 and the optical fiber laid on the skating rink 11 using the laid state data. 21 is associated with the position of the measurement point.

  Therefore, when the control device 24 acquires the temperature of each measurement point in the length direction of the optical fiber 21 from the calculation device 23, it is possible to extract the temperature of the desired measurement point in the skating rink 11.

  When acquiring the temperature of each measurement point from the calculation device 23, the control device 24 extracts the temperature of the bottom of the ice sheet 18, that is, the temperature of the measurement point of the optical fiber 21a in the first layer, and the temperature of the ice sheet 18 for each section. An average temperature Tk1 at the bottom (hereinafter also simply referred to as “temperature Tk1”) is calculated. Further, the control device 24 extracts the temperature of the intermediate portion of the ice sheet 18, that is, the temperature of the measurement point of the optical fiber 21b of the second layer, and the average temperature Tk2 of the intermediate portion of the ice sheet 18 for each section (hereinafter simply referred to as the temperature). (Also referred to as “temperature Tk2”).

  Further, the control device 24 extracts the temperature of the surface layer portion of the ice sheet 18, that is, the temperature of the measurement point of the optical fiber 21c of the third layer, and the average temperature Tk3 (hereinafter simply referred to as the surface layer portion of the ice sheet 18) for each section. (Also referred to as “temperature Tk3”).

  And the control apparatus 24 adjusts the opening degree of the flow regulating valve 14 for every division based on the temperature Tk1 of the bottom part of the ice sheet 18 for each division, the temperature Tk2 of the intermediate part, and the temperature Tk3 of the surface layer part.

  Hereinafter, the ice sheet temperature management method by the ice sheet temperature management system according to the present embodiment will be described with reference to the flowchart of FIG. 3 and the schematic cross-sectional view of the ice sheet 18 of FIG.

  However, here, it is assumed that the target temperature Ttgt of the surface layer portion of the ice sheet 18, the allowable range ΔTallow, and the limit temperature difference ΔTlimit are set in the control device 24 in advance. The limit temperature difference ΔTlimit is the maximum value of the temperature difference that can be adjusted only by the opening degree of the flow rate adjustment valve 14. Moreover, the control apparatus 24 performs the process shown to the flowchart of FIG. 3 for every division.

  First, in step S <b> 11, the control device 24 acquires the temperature of each measurement point from the calculation device 23.

  Next, in step S12, the control device 24 uses the temperature of the measurement point acquired from the calculation device 23 and the data of the laying state of the optical fiber 21, and uses the average temperature Tk1 at the bottom of the ice sheet 18 and the intermediate portion. The average temperature Tk2 and the surface layer average temperature Tk3 are calculated.

  Next, the process proceeds to step S13, and the control device 24 calculates a difference ΔT between the target temperature Ttgt and the surface layer temperature Tk3. In step S14, the control device 24 determines whether or not the difference ΔT between the target temperature Ttgt and the surface layer temperature Tk3 is within a preset allowable range ΔTallow.

  If it is determined in step S14 that the difference ΔT between the target temperature Ttgt and the surface layer temperature Tk3 is outside the allowable range ΔTallow (in the case of NO), the process proceeds to step S15.

  In step S15, the control device 24 determines whether or not the difference ΔT between the target temperature Ttgt and the surface layer temperature Tk3 is smaller than the limit temperature difference ΔTlimit. When it is determined that the difference ΔT between the target temperature Ttgt and the surface layer temperature Tk3 is equal to or larger than the limit temperature difference ΔTlimit (in the case of NO), the process proceeds to step S17, and the difference ΔT between the target temperature Ttgt and the surface layer temperature Tk3 is obtained. Adjusts the output of the refrigerator 15 so as not to exceed the limit temperature difference ΔTlimit.

  When it is determined in step S15 that the difference ΔT between the target temperature Ttgt and the surface layer temperature Tk3 is smaller than the limit temperature difference ΔTlimit (in the case of YES), the process proceeds to step S16. Then, the opening degree of the flow rate adjusting valve 14 is adjusted so that the difference ΔT between the target temperature Ttgt and the surface layer temperature Tk3 is equal to or less than the allowable range ΔTallow.

  That is, when the surface temperature Tk3 is lower than the target temperature Ttgt, the control device 24 decreases the opening of the flow rate adjusting valve 14 and decreases the brine flow rate of the cooling pipe 12. When the surface layer temperature Tk3 is higher than the target temperature Ttgt, the control device 24 increases the opening of the flow rate adjustment valve 14 and increases the brine flow rate of the cooling pipe 12. Then, it returns to step S11 and continues a process.

  On the other hand, if it is determined in step S14 that the difference ΔT between the target temperature Ttgt and the surface layer temperature Tk3 is within the allowable range ΔTallow (in the case of YES), the process proceeds to step S18.

  In step S18, the control device 24 calculates the heat quantity Qkout of the cold heat flowing out from the surface layer portion of the ice sheet 18 into the atmosphere from the temperature Tk1, the intermediate temperature Tk2, and the surface temperature Tk3 of the ice sheet 18; A calorific value Qkin of cold heat flowing into the ice sheet 18 from the cooling pipe 12 is calculated.

  Here, as shown in FIG. 4, the heat capacity between the bottom and the middle part of the ice sheet 18 is Ck12, and the heat capacity between the middle part and the surface layer part is Ck23. Then, the amount of cold heat Qkin flowing into the ice sheet 18 from the cooling pipe 12 and the amount of cold heat Qkout flowing out from the surface layer into the atmosphere are expressed by the following equations (1) and (2).

Qkin = Ck12 × (Tk2−Tk1) (1)
Qkout = Ck23 × (Tk3−Tk2) (2)
If the specific heat of ice and the mass per unit volume are constant, the heat capacity Ck12 is proportional to the ice thickness t1 between the first optical fiber 21a and the second optical fiber 21b, and the heat capacity Ck23 is This is proportional to the ice thickness t2 between the second-layer optical fiber 21b and the third-layer optical fiber 21c.

  Here, for simplicity of explanation, the ice thickness t1 between the first optical fiber 21a and the second optical fiber 21b, the second optical fiber 21b and the third optical It is assumed that the thickness t2 of ice between the fibers 21c is the same.

  In this case, if the value of (Tk2-Tk1)-(Tk3-Tk2) is negative, the amount of heat Qkin flowing from the cooling pipe 12 into the ice sheet 18 is greater than the amount of heat Qkout flowing out from the surface layer into the atmosphere. become. Therefore, in this case, in step S19, the controller 24 opens the flow rate adjustment valve 15 so that the amount of heat Qkin flowing from the cooling pipe 12 into the ice sheet 18 and the amount of heat Qkout flowing out of the surface layer into the atmosphere become equal. To reduce the brine flow rate of the cooling pipe 12.

  On the other hand, if the value of (Tk2-Tk1)-(Tk3-Tk2) is positive, the amount of heat Qkin flowing from the cooling pipe 12 into the ice sheet 18 is greater than the amount of heat Qkout flowing out of the surface layer into the atmosphere. become. Therefore, in this case, in step S19, the controller 24 opens the flow rate adjustment valve 15 so that the amount of heat Qkin flowing from the cooling pipe 12 into the ice sheet 18 and the amount of heat Qkout flowing out of the surface layer into the atmosphere become equal. To increase the brine flow rate of the cooling pipe 12.

  When the heat capacity Ck12 between the first layer optical fiber 21a and the second layer optical fiber 21b is different from the heat capacity Ck23 between the second layer optical fiber 21b and the third layer optical fiber 21c. The values of the heat capacities Ck12 and Ck23 are preferably stored in the control device 24.

  Thus, after adjusting the opening degree of the flow regulating valve 15 in step S17, it returns to step S11 and continues a process.

  As described above, in this embodiment, the skating rink 11 is divided into a plurality of sections, the temperature of the ice sheet 18 is measured for each section, and the brine flow rate is controlled for each section according to the measurement result. Thereby, even if the thermal load applied to the ice sheet 18 differs for each section, the ice sheet 18 can be maintained at a desired temperature over the entire skating rink 11.

  In the present embodiment, the heat quantity Qkout of the cold heat flowing out from the surface layer portion of the ice sheet 18 into the atmosphere and the heat quantity Qkin of the cold heat flowing into the ice sheet 18 from the cooling pipe 12 flow to the cooling pipe 12. Adjust the brine flow rate. Thereby, it is possible to quickly cope with a change in the heat load applied to the ice sheet 18.

  For these reasons, according to the present embodiment, the ice sheet of the skating rink 11 can always be maintained in an appropriate state according to the competition, and a high quality and fair competition condition can be provided to the athlete. In addition, since an appropriate amount of heat (cold heat) can be supplied for each section, there is no waste of the amount of supplied heat, and the operation cost of the skating rink 11 can be reduced.

  In the present embodiment, the case where an optical fiber is used as a temperature sensor for detecting the temperature of the ice sheet 18 has been described. However, the temperature of the ice sheet 18 may be measured using another temperature sensor.

  Moreover, you may provide the temperature sensor which measures the temperature of the brine supplied from the brine cooler 16, and the flowmeter which detects a brine flow volume. Thereby, the calorie | heat amount of the cold supplied from the brine cooler 16 is computable from the temperature and flow volume of a brine.

  For example, by adjusting the set temperature of the refrigerator 15 and the brine supply amount of the brine cooler 16 so that the total outflow heat amount (heat amount Qkout) for each section and the amount of cold heat supplied from the brine cooler 16 are the same, Excessive cooling of the brine can be avoided, and further power saving can be achieved.

  The following additional notes are disclosed with respect to the above embodiments.

(Supplementary note 1) a brine cooler for cooling the cooling medium;
A cooling pipe arranged at the bottom of the ice sheet and through which the cooling medium flows;
A flow rate adjusting unit capable of adjusting the flow rate of the cooling medium flowing through the cooling pipe;
A controller that controls the flow rate adjusting unit so that the amount of cold heat flowing from the cooling pipe into the ice sheet and the amount of cold heat flowing out from the surface layer portion of the ice sheet into the atmosphere coincide with each other. Ice sheet temperature management system.

(Supplementary note 2) a temperature sensor that detects the temperature of the bottom of the ice sheet, the temperature of the intermediate part of the ice sheet, and the temperature of the surface layer of the ice sheet;
The control device calculates the amount of heat of cold flowing into the ice sheet from the cooling pipe from the temperature of the bottom of the ice sheet and the temperature of the intermediate part of the ice sheet, and the temperature of the intermediate part of the ice sheet and the ice The ice sheet temperature management system according to appendix 1, wherein the amount of cold heat flowing out from the surface layer portion of the ice sheet into the atmosphere is calculated from the temperature of the surface layer portion of the floor.

  (Supplementary note 3) The ice sheet temperature management according to supplementary note 2, wherein the ice sheet is divided into a plurality of sections in a top view, and the cooling pipe and the flow rate adjusting unit are provided for each section. system.

  (Supplementary note 4) The temperature management system according to supplementary note 2 or 3, wherein the temperature sensor is an optical fiber.

(Appendix 5) A temperature distribution measuring device connected to the optical fiber and measuring a temperature distribution in the length direction of the optical fiber;
A calculation device that performs correction using a transfer function for the temperature distribution measured by the temperature distribution measurement device;
The temperature management according to claim 4, wherein the control device acquires the temperature of the bottom portion of the surface layer, the temperature of the intermediate portion of the ice sheet, and the temperature of the surface layer portion of the ice sheet via the calculation device. system.

(Supplementary note 6) a step of detecting the temperature of the bottom of the ice sheet, the temperature of the intermediate part, and the temperature of the surface layer part where the cooling pipe through which the cooling medium flows is arranged at the bottom;
Control device for the amount of cold heat flowing into the ice sheet from the cooling pipe and the amount of cold heat flowing into the atmosphere from the surface layer from the temperature of the bottom of the ice sheet, the temperature of the intermediate part, and the temperature of the surface layer The process of calculating by
And a step of controlling a flow rate adjusting unit based on a calculation result of the amount of heat of the cold to adjust a flow rate of the cooling medium flowing through the cooling pipe.

  (Supplementary note 7) The ice sheet temperature management method according to supplementary note 6, wherein the ice sheet is divided into a plurality of sections in a top view, and the cooling pipe and the flow rate adjusting unit are provided for each section.

  (Supplementary note 8) The ice sheet temperature management method according to supplementary note 6 or 7, wherein the temperature of the bottom portion, the intermediate portion, and the surface portion of the ice sheet are detected by an optical fiber.

  DESCRIPTION OF SYMBOLS 11 ... Skating rink, 12 ... Cooling piping, 13a ... Brine supply piping, 13b ... Brine return piping, 14 ... Flow control valve, 15 ... Refrigerator, 16 ... Brine cooler, 17 ... Brine tank, 18 ... Ice sheet, 20 ... Insulating material, 21, 21a, 21b, 21c ... optical fiber, 22 ... temperature distribution measuring device, 23 ... calculating device, 24 ... control device.

Claims (5)

A brine cooler for cooling the cooling medium;
A cooling pipe arranged at the bottom of the ice sheet and through which the cooling medium flows;
A flow rate adjusting unit capable of adjusting the flow rate of the cooling medium flowing through the cooling pipe;
A controller that controls the flow rate adjusting unit so that the amount of cold heat flowing from the cooling pipe into the ice sheet and the amount of cold heat flowing out from the surface layer portion of the ice sheet into the atmosphere coincide with each other. Ice sheet temperature management system. A temperature sensor that detects the temperature of the bottom of the ice sheet, the temperature of the intermediate part of the ice sheet, and the temperature of the surface layer of the ice sheet;
The control device calculates the amount of heat of cold flowing into the ice sheet from the cooling pipe from the temperature of the bottom of the ice sheet and the temperature of the intermediate part of the ice sheet, and the temperature of the intermediate part of the ice sheet and the ice 2. The ice sheet temperature management system according to claim 1, wherein the amount of cold heat flowing out from the surface layer portion of the ice sheet into the atmosphere is calculated from the temperature of the surface layer portion of the floor. 3.   The ice sheet temperature management system according to claim 2, wherein the ice sheet is divided into a plurality of sections in a top view, and the cooling pipe and the flow rate adjusting unit are provided for each section. Detecting the temperature of the bottom of the ice sheet, the temperature of the intermediate part, and the temperature of the surface layer part where the cooling pipe through which the cooling medium flows is arranged at the bottom;
Control device for the amount of cold heat flowing into the ice sheet from the cooling pipe and the amount of cold heat flowing into the atmosphere from the surface layer from the temperature of the bottom of the ice sheet, the temperature of the intermediate part, and the temperature of the surface layer The process of calculating by
And a step of controlling a flow rate adjusting unit based on a calculation result of the amount of heat of the cold to adjust a flow rate of the cooling medium flowing through the cooling pipe.   The ice sheet temperature management method according to claim 4, wherein the ice sheet is divided into a plurality of sections in a top view, and the cooling pipe and the flow rate adjusting unit are provided for each section.

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