JP2004233023A - Air conditioner and air conditioning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize temperature of cold water to be supplied to an air conditioner, maintaining a constant room temperature. <P>SOLUTION: A temperature detector 52 monitors the temperature of water circulating among a cold water bath 18, and refrigerators 36, 38, 40. A flow meter 48 monitors the flow of the cold water heat-exchanged by the air conditioner 12. A controller 46 controls the refrigerator 36 to stop/start according to the temperature monitored by the temperature detector 52 and controls the refrigerators 38, 40 to stop/start according to the flow monitored by the flow meter 48. Not only the temperature of the cold water, but also the flow rate of the cold water heat-exchanged by the air conditioner 12 are employed as a condition for the refrigerators to stop/start, allowing minimized temperature variation of the cold water to be supplied to the air conditioner 12 with respect to a predetermined temperature, thus stabilizing conditions for air conditioning. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioning apparatus and an air conditioning method for air-conditioning a room by exchanging heat between cold water and room air.
[0002]
[Prior art]
A photosensitive lithographic printing plate (hereinafter referred to as “PS plate”) is generally obtained by combining a coiled aluminum plate (hereinafter referred to as “web”) with a surface treatment such as graining, anodizing, or chemical conversion treatment alone or in combination as appropriate. Then, after passing through the coating process in which the coating liquid is applied, the drying process is performed.
[0003]
In such a PS plate manufacturing facility, it is necessary to stabilize the air conditioning conditions in order to maintain the quality of the PS plate.
[0004]
As shown in FIG. 3, in the air conditioner 62 used in the conventional PS plate manufacturing facility, the temperature detector 52 measures the temperature of the cold water circulating between the cold water tank 18 and the refrigerators 36, 38, 40. Based on the measurement result, the control device 64 detects the temperature of the cold water circulating between the cold water tank 18 and the air conditioner 12 or a method for stopping or operating any of the refrigerators 36, 38, 40. The control device 64 stopped or operated one of the refrigerators 36, 38, 40 based on the measurement result (see Patent Document 1).
[0005]
However, the amount of heat used by the air conditioner 12 varies depending on various conditions of the air-conditioned space 66, and the temperature of the cold water sent to the air conditioner cannot be stabilized only by controlling based on the temperature of the cold water, and is subject to air conditioning. The room temperature could not be kept constant.
[0006]
[Patent Document 1]
JP 2002-39600 A
[Problems to be solved by the invention]
In view of the above facts, the present invention aims to stabilize the temperature of the cold water sent to the air conditioner and keep the room temperature constant.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is an air conditioner for exchanging heat between cold water and room air, a cold water tank for temporarily storing cold water heat-exchanged by the air conditioner, a plurality of refrigerators for cooling water, A first circulation pump for sending the cold water in the cold water tank to the refrigerator and circulating it again to the cold water tank; a first temperature sensor for measuring the temperature of the cold water circulating between the cold water tank and the refrigerator; Measured by a second circulation pump that sends cold water from the cold water tank to the air conditioner and circulates it again to the cold water tank, a flow meter that measures the flow rate of the cold water heat-exchanged by the air conditioner, and the first temperature sensor. And a first control unit that stops or operates any of the plurality of refrigerators based on the temperature and the flow rate measured by the flow meter.
[0009]
The invention described in claim 1 is provided with an air conditioner for air-conditioning the room by exchanging heat between cold water and room air. The cold water heat-exchanged by this air conditioner is temporarily stored in the cold water tank. The first circulation pump circulates the cold water stored in the cold water tank between the refrigerator and the cold water tank, and the refrigerator cools to a predetermined temperature. In this way, the cooled cold water is sent from the cold water tank to the air conditioner by the second circulation pump, and is heat-exchanged by the air conditioner and then returned to the cold water tank again.
[0010]
And a 1st temperature sensor measures the temperature of the cold water which circulates between a cold water tank and a refrigerator, and a flowmeter measures the flow volume of the cold water heat-exchanged with the air conditioner. The first control means stops or operates any of the refrigerators based on the temperature measured by the first temperature sensor, and stops or operates any of the refrigerators based on the flow rate measured by the flow meter.
[0011]
For this reason, as in the prior art, not only the temperature of the chilled water circulating between the refrigerator and the chilled water tank, but also the flow rate of the chilled water heat-exchanged by the air conditioner is set as a condition for stopping or operating the refrigerator. The temperature of the chilled water sent to the machine varies less with respect to the set temperature, and the air conditioning conditions are stabilized.
[0012]
The invention according to claim 2 is an air conditioner for exchanging heat between cold water and room air, a cold water tank for temporarily storing cold water heat-exchanged by the air conditioner, a plurality of refrigerators for cooling water, A first circulation pump that sends cold water from the cold water tank to the refrigerator and circulates again to the cold water tank; a second circulation pump that sends cold water from the cold water tank to the air conditioner and circulates again to the cold water tank; A second temperature sensor that measures the temperature of the cold water sent from the cold water tank to the air conditioner, a flow meter that measures the flow rate of the cold water heat-exchanged by the air conditioner, and the heat exchanger that is heat-exchanged by the air conditioner to the cold water tank A third temperature sensor for measuring the temperature of the chilled water to be sent; a temperature measured by the second temperature sensor; a flow rate measured by the flow meter; and a temperature measured by the second sensor and the third sensor. Based on the heat consumed by the air conditioner calculated from the difference, Is characterized by a having a second control means for stopping or running any of the refrigerator.
[0013]
In the invention according to claim 2, the second temperature sensor measures the temperature of the cold water sent from the cold water tank to the air conditioner, and the third temperature sensor measures the temperature of the cold water exchanged by the air conditioner and sent to the cold water tank. To do. Further, the flow meter measures the flow rate of the cold water heat-exchanged by the air conditioner.
[0014]
The second control means stops or operates one of the refrigerators based on the temperature measured by the second temperature sensor, and also measures the flow rate measured by the flow meter and the temperature measured by the second sensor and the third sensor. One of the refrigerators is stopped or operated based on the amount of heat used by the air conditioner calculated from the difference.
[0015]
For this reason, as in the past, not only the temperature of the cold water circulating between the air conditioner and the cold water tank, but also the amount of heat used by the air conditioner of the air conditioner is set as the condition for stopping or operating the refrigerator, so that it can be sent to the air conditioner. The temperature of the chilled water is less varied with respect to the set temperature, and the air conditioning conditions are stabilized.
[0016]
Invention of Claim 3 is equipped with the 1st temperature sensor which measures the temperature of the cold water which circulates between the said cold water tank and the said refrigerator, and based on the temperature measured by the said 1st temperature sensor, Third control for stopping or operating the remaining refrigerators when either one of the flow rate measured by the flow meter or the heat consumption of the air conditioner reaches a set value first. And means.
[0017]
In the invention according to claim 3, the third control means mainly operates one of the plurality of refrigerators, and either one of the flow rate measured by the flow meter or the amount of heat used by the air conditioner is first. When the set value is reached, the remaining refrigerators are stopped or operated. Thereby, the air-conditioning conditions of the indoor air heat-exchanged with an air conditioner are stabilized.
[0018]
Invention of Claim 4 is the temperature of the cold water sent to the said air conditioner in the air-conditioning method which cools and circulates air by cooling with several refrigerators to the air conditioner which heat-exchanges cold water and room air. The refrigerator to be stopped or operated is determined from the temperature of the cold water sent to the refrigerator, the flow rate of the cold water exchanged by the air conditioner, or the amount of heat used by the air conditioner.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0020]
As shown in FIG. 1, in the air conditioner 10 according to the present embodiment, three air conditioners 12 are arranged as an air conditioner group in a PS plate manufacturing factory 60. The water supply pipe 14 for supplying cold water to the air conditioner 12 is branched into three, and cold water is supplied from the cold water tank 18 by the circulation pump 16.
[0021]
The air conditioner 12 exchanges heat between indoor air and cold water in the PS plate manufacturing factory, and keeps the PS plate manufacturing factory 60 at a set temperature. The air conditioner 12 used in this embodiment is an automatic valve control system that varies the cold water flowing to the air conditioner 12 in accordance with the heat load (heat consumption) in the PS plate manufacturing factory 60. Therefore, when the amount of heat used increases, the flow rate of cold water flowing to the air conditioner increases.
[0022]
The cold water heat-exchanged by the air conditioner 12 is returned to the cold water tank 18 by the return pipe 20. A water supply pipe 22 is connected to the cold water tank 18. The water supply pipe 22 is branched into three branch pipes 24, 26, and 28. The circulation pumps 30, 32, and 34 arranged in the branch pipes 24, 26, and 28 are respectively connected to the refrigerators 36, 38, and 40 in the cold water tank. Eighteen cold water is fed.
[0023]
The cold water cooled by the refrigerators 36, 38, 40 is collected in the return pipe 42 and returned to the cold water tank 18. The cold water tank 18 serves as a buffer for reducing the temperature fluctuation of the cold water, but the temperature of the cold water sent to the air conditioner 12 is different from the temperature of the cold water sent to the refrigerators 36, 38, and 40. There is a temperature gradient in the cold water tank 18,
Furthermore, a temperature detector 44 that detects the temperature of the cold water supplied to the air conditioner 12 is disposed in the water supply pipe 14. The temperature measured by the temperature detector 44 is transmitted to the control device 46 as temperature information.
[0024]
The return pipe 20 has a flow meter 48 that detects the flow rate of the cold water that circulates through the air conditioner 12 and returns to the cold water tank 18, and a temperature that detects the temperature of the cold water that circulates through the air conditioner 12 and returns to the cold water tank 18. A detector 50 is provided. The results detected by the flow meter 48 and the temperature detector 50 are transmitted to the control device 46.
[0025]
Further, the water supply pipe 22 is provided with a temperature detector 52 for detecting the temperature of the cold water supplied to the refrigerators 36, 38, 40, and the temperature measured by the temperature detector 52 is controlled as temperature information. Sent to device 46.
[0026]
Next, with reference to the flowchart shown in FIG. 2, the control method of the air-conditioning apparatus which stabilizes the air-conditioning condition by controlling the temperature of the cold water sent to the air-conditioner to 7 ° C. ± 1 ° C. with three refrigerators will be described. To do. In addition, each refrigerator has the capability to make the cold water temperature of an exit into 7 degreeC.
[0027]
In step 100, the first refrigerator 36 is operated. In step 102, the temperature detector 52 detects the temperature T0 of the cold water fed to the refrigerators 36, 38, 40. If T0 ≦ 7.5 ° C., the refrigerator 36 is stopped at step 104. If 7.5 ° C <T0 <8 ° C, the process returns to step 100 and the refrigerator 36 continues to operate.
[0028]
If T0 ≧ 8 ° C., in step 106, the flow meter 48 detects the flow rate L of cold water that circulates through the air conditioner 12 and returns to the cold water tank 18. If L <L1 (30% of the maximum flow rate flowing through the air conditioner), the process returns to step 100. If L ≧ L1, the second refrigerator 38 is operated in step 108.
[0029]
Next, in step 110, the flow meter 48 detects the flow rate L of cold water that circulates through the air conditioner 12 and returns to the cold water tank 18. When L2 (23% of the maximum flow rate flowing through the air conditioner) <L <L3 (63% of the maximum flow rate flowing through the air conditioner), the process returns to step 108 and the operation of the refrigerator 38 is continued.
[0030]
In step 110, if L ≦ L2 (23% of the maximum flow rate flowing through the air conditioner), the second refrigerator 38 is stopped in step 112. In the case of L ≧ L3 (63% of the maximum flow rate flowing through the air conditioner), the third refrigerator 40 is operated in step 114.
[0031]
Next, in step 116, the flow meter 48 detects the flow rate L of cold water that circulates through the air conditioner 12 and returns to the cold water tank 18. When L4 (57% of the maximum flow rate flowing through the air conditioner) <L <L3 (63% of the maximum flow rate flowing through the air conditioner), the process returns to step 114 and the operation of the refrigerator 40 is continued.
[0032]
If L ≦ L4 (57% of the maximum flow rate flowing through the air conditioner) at step 116, the third refrigerator 40 is stopped at step 118.
[0033]
As described above, the refrigerators 38 and 40 are stopped or operated in accordance with not only the temperature of the cold water flowing from the cold water tank 18 to the refrigerators 36, 38, and 40 but also the flow rate of the cold water exchanged by the air conditioner 18. Thus, the fluctuation of the temperature of the cold water sent to the air conditioner 12 becomes small with respect to the set temperature, and the air conditioning conditions are stabilized.
[0034]
In the present embodiment, the operating condition of the second refrigerator 38 is 30% of the maximum flow rate flowing through the air conditioner, but it may be between 20% and 40%. Although the stop condition of the refrigerator 38 is 23% of the maximum flow rate flowing through the air conditioner, it may be between 15% and 40%.
[0035]
Furthermore, although the operating condition of the third refrigerator 40 is 63% of the maximum flow rate flowing through the air conditioner, it may be between 40% and 70%, and the third refrigerator 40 is stopped. The condition is 57% of the maximum flow rate flowing through the air conditioner, but may be between 40% and 70%.
[0036]
In addition, the operating / stopping condition may be the amount of heat used by the air conditioner instead of the cold water flow rate.
[0037]
That is, the amount of heat used by the air conditioner is calculated from the difference between the temperatures measured by the temperature detector 44 and the temperature detector 50 and the flow rate of the chilled water measured by the flow meter 48. It can also be operated and stopped.
[0038]
In this case, it is desirable to set the maximum amount of heat used by the air conditioner to 70% to 100% of the maximum capacity of the refrigerator.
[0039]
In addition, the operating condition of the second refrigerator 38 can be set between 20% and 40% of the maximum operating heat quantity, and the operating condition of the second refrigerator 38 can be set as the stopping condition of the second refrigerator 38. Can be set to 15% to 40% of the maximum amount of heat used.
[0040]
Further, the operating condition of the third refrigerator 40 can be set between 40% and 70% of the maximum heat consumption, and the operating condition of the third refrigerator 40 can be set as the stop condition of the third refrigerator 40. Can be set between 40% and 70% of the maximum amount of heat used.
[0041]
In the above description, the refrigerator is controlled by either the chilled water flow rate or the air conditioner heat consumption. However, the chiller is operated on the condition that either the chilled water flow rate or the air conditioner heat consumption reaches the set value. It is also possible to operate / stop the system. Further, as a condition for operating / stopping the first refrigerator, the temperature of the cold water supplied to the air conditioner detected by the temperature detector 44 may be used.
[0042]
Furthermore, if such an air conditioner is used not only for PS plate manufacturing equipment but also for PS plate processing equipment, processing conditions such as CTP can be stabilized.
[0043]
Here, the manufacturing process of the PS plate will be described.
[0044]
The PS plate is a JIS-A1050 aluminum material containing 99.5% by weight aluminum, 0.01% by weight copper, 0.03% by weight titanium, 0.3% by weight iron and 0.1% by weight silicon. After the surface of the 0.30 mm thick rolled plate was grained using a 20 mesh% aqueous suspension of 400 mesh Pamiston (manufactured by Kyoritsu Ceramics) and a rotating nylon brush (6,10-nylon), Washed well with water.
[0045]
This was immersed in a 15% by weight aqueous sodium hydroxide solution (containing 4.5% by weight of aluminum) and etched so that the amount of aluminum dissolved was 5 g / m ² , and then washed with running water. Further, neutralized with 1% by weight nitric acid, and then in a 0.7% by weight nitric acid aqueous solution (containing 0.5% by weight of aluminum), a rectangular wave with an anode voltage of 10.5 volts and a cathode voltage of 9.3 volts Using an alternating waveform voltage (current ratio r = 0.90, current waveform described in the example of Japanese Patent Publication No. 58-5796), an electrolytic surface roughening treatment was performed at an anode time electric quantity of 160 coulomb / dm ^2. It was. After washing with water, it was immersed in a 10% by weight sodium hydroxide aqueous solution at 35 ° C., etched so that the amount of dissolved aluminum was 1 g / m ² , and then washed with water. Next, it was immersed in an aqueous sulfuric acid solution at 50 ° C. and 30% by weight, desmutted, and washed with water.
[0046]
Further, a porous anodic oxide film forming treatment was performed using a direct current in a 20 wt% sulfuric acid aqueous solution (containing 0.8 wt% aluminum) at 35 ° C. That is, electrolysis was performed at a current density of 13 A / dm ² and the weight of the anodic oxide film was adjusted to 2.7 g / m ² by adjusting the electrolysis time. In order to prepare a negative photosensitive lithographic printing plate using a diazo resin and a binder, this support was washed with water, immersed in a 3% by weight aqueous solution of sodium silicate at 70 ° C. for 30 seconds, and washed and dried.
[0047]
The thus-obtained aluminum support, Macbeth RD920 reflection density was measured with a reflection densitometer 0.30, the center line average roughness _{R a} as defined in JIS B00601 was 0.58 .mu.m.
[0048]
Next, a 1.0% by weight aqueous solution of methyl methacrylate / ethyl acrylate / 2-acrylamido-2-methylpropanesulfonic acid sodium copolymer (average molecular weight of about 60,000) (molar ratio 50/30/20) was applied to the support. It apply | coated so that the application quantity after drying might be set to 0.05 g / m < ² > with a roll coater.
[0049]
Further, the following photosensitive solution-1 was applied with a bar coater and dried at 110 ° C. for 45 seconds. The dry coating amount was 2.0 g / m ² .
Photosensitive solution-1
Diazo resin-1 0.50g
Binder-1 5.00g
Stilite HS-2 (Daido Kogyo Co., Ltd.) 0.10g
Victoria Pure Blue BOH 0.15g
Tricresyl phosphate 0.50 g
Dipicolinic acid 0.20g
FC-430 (3M surfactant) 0.05 g
Solvent 1-methoxy-2-propanol 25.00g
Methyl lactate 12.00g
Methanol 30.00g
Methyl ethyl ketone 30.00g
3.00 g of water
The above diazo resin-1 was obtained as follows. First, 29.4 g of 4-diazodiphenylamine sulfate (purity 99.5%) was gradually added to 70 ml of 96% sulfuric acid at 25 ° C. and stirred for 20 minutes. To this, 3.26 g of paraformaldehyde (purity 92%) was gradually added over about 10 minutes, and the mixture was stirred at 30 ° C. for 4 hours to allow the condensation reaction to proceed. The condensation molar ratio between the diazo compound and formaldehyde is 1: 1. The reaction product was poured into 2 liters of ice water with stirring and treated with a cold concentrated aqueous solution in which 130 g of sodium chloride was dissolved. The precipitate was collected by suction filtration, and the partially dried solid was dissolved in 1 liter of water, filtered, cooled with ice, and treated with an aqueous solution in which 23 g of potassium hexafluorophosphate was dissolved. Finally, the precipitate was collected by filtration and air-dried to obtain 1 g of diazo resin.
[0050]
Binder-1 is a 2-hydroxyethyl methacrylate / acrylonitrile / methyl methacrylate / methacrylic acid copolymer (weight ratio 50/20/26/4, average molecular weight 75,000, acid content 0.4 meq / g). It is an alkali water-soluble film-forming polymer.
[0051]
Stylite HS-2 (manufactured by Daido Kogyo Co., Ltd.) is a polymer compound having higher oil sensitivity than the binder, and is styrene / maleic acid mono-4-methyl-2-pentyl ester = 50/50 (molar ratio). The average molecular weight was about 100,000. The mat layer was formed by spraying the mat layer forming resin solution onto the surface of the photosensitive layer thus prepared as follows.
[0052]
【The invention's effect】
Since the present invention is configured as described above, an object of the present invention is to stabilize the temperature of the cold water sent to the air conditioner and keep the room temperature constant.
[Brief description of the drawings]
FIG. 1 is a block diagram of an air conditioner according to the present embodiment.
FIG. 2 is a flowchart of an air conditioner according to the present embodiment.
FIG. 3 is a block diagram of a conventional air conditioner.
[Explanation of symbols]
12 Air conditioner 16 Circulation pump (second circulation pump)
18 Cold water tank 30 Circulation pump (first circulation pump)
32 Circulation pump (first circulation pump)
34 Circulation pump (first circulation pump)
36 Refrigerator 38 Refrigerator 40 Refrigerator 44 Temperature detector (second temperature sensor)
46 Control device (first control means, second control means, third control means)
48 Flow meter 50 Temperature detector (third temperature sensor)
52 Temperature detector (first temperature sensor)

Claims (4)

An air conditioner for exchanging heat between cold water and room air;
A cold water tank for temporarily storing cold water heat-exchanged by the air conditioner;
A plurality of refrigerators for cooling water;
A first circulation pump for sending the cold water in the cold water tank to the refrigerator and circulating it again to the cold water tank;
A first temperature sensor for measuring a temperature of cold water circulating between the cold water tank and the refrigerator;
A second circulation pump for sending the cold water in the cold water tank to the air conditioner and circulating it again to the cold water tank;
A flow meter for measuring the flow rate of cold water heat-exchanged by the air conditioner;
An air conditioner comprising: first control means for stopping or operating any of the plurality of refrigerators based on the temperature measured by the first temperature sensor and the flow rate measured by the flow meter. An air conditioner for exchanging heat between cold water and room air;
A cold water tank for temporarily storing cold water heat-exchanged by the air conditioner;
A plurality of refrigerators for cooling water;
A first circulation pump for sending the cold water in the cold water tank to the refrigerator and circulating it again to the cold water tank;
A second circulation pump for sending the cold water in the cold water tank to the air conditioner and circulating it again to the cold water tank;
A second temperature sensor for measuring a temperature of cold water sent from the cold water tank to the air conditioner;
A flow meter for measuring the flow rate of cold water heat-exchanged by the air conditioner;
A third temperature sensor for measuring a temperature of the cold water exchanged by the air conditioner and sent to the cold water tank;
Based on the temperature measured by the second temperature sensor, the flow rate measured by the flowmeter and the temperature difference between the temperature measured by the second sensor and the third sensor, a plurality of air conditioner use heat quantities are calculated. And a second control means for stopping or operating one of the refrigerators. A first temperature sensor for measuring a temperature of the cold water circulating between the cold water tank and the refrigerator;
One refrigerator is stopped or operated based on the temperature measured by the first temperature sensor,
A third control means for stopping or operating the remaining refrigerator when either one of the flow rate measured by the flow meter or the heat consumption of the air conditioner reaches a set value first. The air conditioner according to claim 2. In the air conditioning method of cooling and circulating water with a plurality of refrigerators to air conditioner that exchanges heat between cold water and room air,
The refrigerator to be stopped or operated is determined from the temperature of the cold water sent to the air conditioner, the temperature of the cold water sent to the refrigerator, the flow rate of the cold water exchanged by the air conditioner, or the amount of heat used by the air conditioner. An air conditioning method characterized by that.

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