JPH058328U - Cold storage type cold heat supply device - Google Patents

Abstract

(57) [Summary] [Purpose] A load-side refrigerant path with a load-side heat exchanger,
A cool storage unit, a refrigerator that cools the refrigerant below freezing in a cold storage operation, a valve that opens and closes the load side refrigerant path, and a bypass refrigerant path to the load side refrigerant path, and the load side refrigerant path with the valve opened. And a cold heat consumption operation of circulating the refrigerant between the cold storage means and the refrigerator, and a cold storage operation of circulating the refrigerant between the cold storage means and the refrigerator via the bypass refrigerant path with the valve closed, alternatively. In the cold storage type cold heat supply device according to the present invention, during the cold storage operation, a freezing trouble or the like in the load side heat exchanger due to the incomplete valve closing of the valve can be avoided in advance. [Structure] A detection means 12A for detecting the inflow of the cold storage sub-freezing refrigerant into the load side refrigerant passage 6 during the cold storage operation is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a load side refrigerant passage having a load side heat exchanger, a cool storage means, and a cool storage operation. A refrigerator for cooling the refrigerant below freezing in, and a valve for opening and closing the load side refrigerant passage, A bypass refrigerant path to the load side refrigerant path, and the load in the state where the valve is opened. Cooling heat consumption operation for circulating a refrigerant through the side refrigerant passage, the cold storage means, and the refrigerator. And the cold storage means and the refrigerator via the bypass refrigerant passage with the valve closed. A cold storage type cold heat supply device that selectively performs cold storage operation in which the refrigerant is circulated over Regarding the table

[0002]

[Prior art]

  In the above cold storage type cold heat supply device, the valve that opens and closes the refrigerant passage on the load side fails. Due to the entrapment of foreign matter such as dust, the valve will not be completely closed during cold storage operation. , The sub-freezing refrigerant for cold storage originally shuts off the inflow with a valve during cold storage operation. It may flow into the load side refrigerant passage, but as a countermeasure against this, the conventional By installing a filter in the refrigerant passage, foreign matter such as dust is prevented from getting caught in the valve. The only thing that was done was to stop.

[0003]

[Problems to be solved by the device]

  However, the valve itself could not be closed due to failure, and the filter was not installed. However, since foreign matter such as dust cannot be completely removed, the foreign matter such as dust will still be caught. The valve may not be completely closed due to penetration, and during cold storage operation Refrigerant may flow into the load side refrigerant passage, and this sub-freezing cold storage Because of the inflow of the medium, it remains in the load side heat exchanger in the no-load state during cold storage operation. A secondary abnormality such as freezing of the fluid to be cooled or abnormal frost formation on the machine occurs. There was a risk of damage to the load side heat exchanger and deterioration of the heat exchanger.

[0004]   An object of the present invention is to deal with the above problem with a reasonable additional configuration.

[0005]

[Means for Solving the Problems]

  The first characteristic configuration of the regenerator type cold heat supply device according to the present invention is that a load side heat exchanger is provided. Load side refrigerant passage, cool storage means, and a cooler that cools the refrigerant below freezing in cold storage operation. Freezer, valve for opening and closing the load side refrigerant passage, and bypass refrigerant for the load side refrigerant passage A refrigerant passage, the load side refrigerant passage, the cold storage means, and the refrigeration with the valve opened. Cold heat consumption operation in which the refrigerant is circulated through the machine and the bypass valve with the valve closed. A cold storage operation in which a refrigerant is circulated between the cold storage means and the refrigerator via a circulation refrigerant path. In a configuration that selectively implements   Detection for detecting the inflow of the sub-freezing refrigerant for cold storage into the load side refrigerant passage during cold storage operation Since the output means is provided, its action and effect are as follows.

[0006]

[Action]

  In other words, the valve that opens and closes the refrigerant passage on the load side stores cold due to malfunctions or foreign matter such as dust trapped. During operation, the valve cannot be closed completely, so the sub-freezing refrigerant for cold storage is cooled on the load side. Even if it flows into the medium path, the inflow can be accurately detected by the above detection means. Then, based on the detection result, the load side is automatically or artificially provided with appropriate means. As described above, due to the inflow of the sub-freezing refrigerant for cold storage into the refrigerant passage, the load side heat exchanger may freeze or become different. The occurrence of secondary abnormalities such as permanent frost can be avoided in advance.

[0007]

[Effect of device]

  As a result, according to the first characteristic configuration of the present invention, the valve tray for opening and closing the refrigerant passage on the load side is opened. Causes damage to the equipment or deterioration of the equipment due to freezing or abnormal frost formation. This can improve the durability of the device and the reliability of the device. I was able to get it.

[0008]   [Second and Third Characteristic Configurations of the Present Invention]   A second characteristic configuration of the cold storage type cold heat supply device according to the present invention is characterized in that the detection means is Detects the inflow of sub-freezing refrigerant for cold storage based on the temperature measurement information of the temperature measurement means installed in the load side refrigerant passage That is what you do.

[0009]   In other words, originally, in the cold storage operation that shuts off the refrigerant flow into the load side refrigerant passage, When the sub-freezing refrigerant for the refrigerant flows into the load-side refrigerant passage, it flows into the load-side refrigerant passage due to the inflow. Temperature drops. Therefore, according to the second characteristic configuration described above, this temperature decrease Is detected on the basis of the temperature measurement information of the temperature measurement means, the ice for cold storage in the refrigerant passage on the load side is detected. The point-in-point refrigerant inflow can be accurately detected.

[0010]   According to a third characteristic configuration of the cold storage type cold heat supply device according to the present invention, the detection means is a refrigerant. The inflow of refrigerant is detected based on the measurement information of the flow rate measuring means.

[0011]   In other words, originally, in the cold storage operation that shuts off the refrigerant flow into the load side refrigerant passage, When the sub-freezing refrigerant for the refrigerant flows into the load side refrigerant passage, a refrigerant flow is generated in the load side refrigerant passage. The flow rate of the refrigerant in the bypass refrigerant passage decreases, such as Due to the inflow of the refrigerant, the refrigerant flow rate changes in each part of the device refrigerant passage. Therefore, above According to the third characteristic configuration of the above, these changes in the refrigerant flow rate are used as the measurement information of the refrigerant flow rate measuring means. Based on the detection based on the You can get out.

[0012]

【Example】

  Next, examples will be described.

[0013]   FIG. 1 shows a device configuration of a cold storage type cold heat supply device, in which a main refrigerant having a refrigerant pump 1 interposed. A latent heat storage type heat storage tank 3 and an air-cooling heat pump type refrigerator 4 are installed in series in the path 2. Then, the load-side refrigerant passage 6 with the load-side heat exchanger 5 interposed is provided with respect to the main refrigerant passage 2. A refrigerating machine 4, a load-side heat exchanger 5, and a heat storage tank 3 are formed in order to form a refrigerant circulation path. Are connected.

[0014]   Further, with respect to the bypass refrigerant passage 7 for the load side refrigerant passage 6, that is, for the main refrigerant passage 2 In addition to providing a refrigerant passage connected in parallel with the load-side refrigerant passage 6, in the main refrigerant passage 2 A bypass 8 for the heat storage tank 3 is provided.

[0015]   In the load side refrigerant passage 6 and the bypass refrigerant passage 7, cold heat generated by the refrigerator 4 is stored in the heat storage tank 3 The cold storage operation of storing heat in the storage tank, and taking out the stored cold heat from the heat storage tank 3 to load the heat exchanger 5 on the load side. The refrigerant circulation path is cut off during cold heat consumption operation in which cold heat is applied to the cold heat consumption device side. As means for exchanging, a load side solenoid valve 9 for opening and closing the load side refrigerant passage 6, and a bypass refrigerant A bypass solenoid valve 10 for opening and closing the passage 7 is interposed, and the main refrigerant passage of the bypass passage 8 is also provided. In the merging portion for 2, the amount of refrigerant passing through the heat storage tank 3 and the amount of refrigerant passing through the bypass passage 8 are Provide a confluent three-way valve 11 that adjusts the ratio to adjust the amount of cold heat taken out from the heat storage tank 3. is there.

[0016]   Reference numeral 12 denotes switching control between cold storage operation and cold heat consumption operation, and the confluent three-way valve 1 described above. 1 is a controller that performs adjustment control, and 13 is a check valve.

[0017]   As a configuration on the side of the cold heat consuming device, the air conditioner 14 and the load side heat exchanger 5 are connected. A cold water circulation path 15 is provided, and a cold water circulation path is provided by a cold water pump 16 during cold heat consumption operation. By circulating cold water in 15, the load side refrigerant in the load side heat exchanger 5 The air conditioner 1 serving as a cold energy consuming device, the cold heat given to the circulating cold water from the circulating refrigerant in the passage 6. 4 is transported and supplied.

[0018]   The cool storage operation is performed by a timer control during a predetermined night time In this cold storage operation, the controller 12 closes the load side solenoid valve 9 and , The bypass solenoid valve 10 is opened and the passage of the refrigerant to the bypass 8 is blocked. By adjusting the merging three-way valve 11 to a state in which the refrigerant pump 1 is operated, As shown in FIG. 1, with the refrigerant circulation to the load side refrigerant passage 6 cut off, With the entire amount of the medium passing through the heat storage tank 3, the refrigerator 4 and the heat storage tank are connected via the bypass refrigerant path 7. Circulate the refrigerant over

[0019]   In addition, the outlet refrigerant temperature of the refrigerator 4 is set to a predetermined freezing temperature Ta below the freezing point (for example, -4 The temperature of the refrigerator 4 is controlled so that the temperature of the refrigerator 4 is controlled to The latent heat storage material in the tank 3 is gradually cooled by the sub-freezing circulating refrigerant supplied from the refrigerator 4. After that, the cold heat is stored in the heat storage tank 3.

[0020]   On the other hand, the cooling energy consumption operation is performed in cooperation with the operation of the air conditioner 14 and the chilled water pump 16. In this cold heat consumption operation, the controller 12 controls the load side power supply. The magnetic valve 9 is opened, the bypass solenoid valve 10 is closed, and the refrigerant pump 1 is operated in this state. As shown in FIG. 2, when the refrigerant circulation to the bypass refrigerant passage 7 is cut off, The refrigerant is circulated through the refrigerator 4, the heat exchanger 5 on the load side, and the heat storage tank 3.

[0021]   In addition, the heat storage remaining amount in the heat storage tank 3 and the cooling load of the load side heat exchanger 5 Based on the calculation, a heat storage tank 3 for reducing the remaining heat storage amount according to a predetermined consumption plan. The load sharing for the refrigerator 4 is sequentially determined, and the amount of cold heat taken out from the heat storage tank 3, And each of the auxiliary generated cold heat amount of the refrigerator 4 to an amount according to the determined load sharing, Sequentially adjust the confluent three-way valve 11 and control the capacity of the refrigerator 4 to store heat. Cold heat extraction from the tank 3 (that is, refrigerant cooling by passing through the heat storage tank 3) and refrigerator The auxiliary operation of 4 reduces the heat storage remaining amount of the heat storage tank 3 in accordance with a predetermined consumption plan. However, the temperature Tb (corresponding to the required cold water temperature of the air conditioner 14 for the load side heat exchanger 5) (For example, the required cold water temperature of the air conditioner 14 is about 7 ° C, while the temperature is about 5 ° C) The refrigerant is continuously supplied.

[0022]   In addition, the heat storage remaining amount of the heat storage tank 3 is the inlet / outlet refrigerant temperature of the heat storage tank 3 during the cold storage operation. The cool storage amount calculated based on the degree difference and the amount of refrigerant passing through the heat storage tank 3 is integrated to store the cool storage amount. Calculate the total cold heat storage amount at the time of operation completion, and at the time of cold heat consumption operation Similarly, based on the refrigerant temperature difference between the inlet and outlet of the heat storage tank 3 and the amount of refrigerant passing through the heat storage tank 3, Calculated by subtracting the integrated value of the calculated cold heat extraction amount from the total cold heat storage amount On the other hand, the cooling load in the load side heat exchanger 5 is Based on the inlet / outlet cold water temperature difference of the exchanger 5 and the cold water passage amount to the load side heat exchanger 5. Is calculated.

[0023]   In addition, as the consumption heat remaining consumption plan, for example, during a predetermined operation time period of the air conditioner 14, At the end of the air conditioner operating time period, the remaining amount of heat storage is reduced at a specified reduction rate. Is set to set the remaining heat storage amount to 0.

[0024]   At the inlet side of the load side heat exchanger 5 in the load side refrigerant passage 6, a temperature for measuring the refrigerant temperature is measured. The temperature sensor 17 is attached, and the controller 12 has a load during cold storage operation. The storage side of the load side refrigerant passage 6 for which the refrigerant circulation should be cut off by closing the side solenoid valve 9 The fact that the sub-freezing refrigerant has flowed in is detected based on the temperature information detected by the temperature sensor 17. Detection circuit 12A, and when the refrigerator 4 is stopped when this abnormal inflow is detected Both are provided with a safety circuit 12B for reporting an abnormal inflow.

[0025]   In other words, the load side solenoid valve 9 is completely closed due to the trapping of foreign matter such as dust or the failure of the valve itself. Therefore, the sub-freezing refrigerant for cold storage is supplied to the load-side refrigerant path 6 during cold storage operation. Even if an abnormal inflow occurs, the safety circuit detects the abnormal inflow by the above detection circuit 12A. The cold storage operation is performed by automatically stopping the refrigerator 4 with the path 12B and notifying the abnormality. Occurs when the sub-freezing refrigerant for cold storage flows into the heat exchanger 5 on the load side that is in an unloaded state It is possible to avoid secondary troubles such as freezing of accumulated cold water in the load side heat exchanger 5 and abnormal frost formation. I can do it.

[0026]   The detection circuit 12A has a specific detection configuration during cold heat consumption operation. At a temperature lower than the refrigerant supply temperature Tb to the load side heat exchanger 5 and during cold storage operation The temperature setting set to a temperature higher than the sub-freezing temperature storage temperature Ta of the refrigerator outlet refrigerant in Constant value Ts (for example, Ta = −4 to 5 ° C. and Tb = 5 ° C. while Ts = −2) Temperature detected by the temperature sensor 17 during cold storage operation. When the temperature Tx decreases to the set value Ts, the cold side cold storage for cold storage is performed to the load side refrigerant passage 6. The configuration is such that it is determined that the medium has abnormally flowed in.

[0027]   [Another embodiment]   Next, another embodiment will be listed.

[0028]   In the above-described embodiment, the cool storage means 3, the refrigerator 4, and the load side refrigerant are used during the cold heat consumption operation. Although the refrigerant passage is configured to circulate the refrigerant in the order of the passage 6, instead of this, the cooling heat consumption operation is performed. Refrigerant path configuration for circulating the refrigerant in the order of the refrigerator 4, the cool storage means 3, and the load side refrigerant path 6 May be

[0029]   Various types of cold storage means 3 can be applied as the specific structure and cold storage configuration. It

[0030]   The refrigerator 4 is not limited to the air-cooled heat pump type, and the load side heat exchange is also possible. The cooling target of the exchanger 5 is not limited to the circulating cold water for the air conditioner 14.

[0031]   The temperature set value Ts in the above-described embodiment is the temperature sensor 1 during the cold heat consumption operation. Refrigerant on the load side at a temperature lower than the temperature generated at the temperature measurement point of 7 and during cold storage operation Temperature generated at the temperature measurement point of the temperature sensor 17 due to the inflow of the sub-freezing refrigerant for cold storage into the passage 6. It may be either a positive temperature or a negative temperature as long as it is higher than Abnormality of the sub-freezing refrigerant for cold storage based on the information detected by the temperature sensor 17 except during operation When adopting the configuration that does not perform the inflow detection, the temperature set value Ts is set to the cold heat consumption. It is necessary to limit the temperature to a temperature lower than the temperature generated at the temperature measurement point of the temperature sensor 17 during operation. It doesn't matter.

[0032]   The temperature sensor 17 is set to cool the load side heat exchanger 5 during the cold heat consumption operation. It may also be used as a coolant temperature sensor for detection.

[0033]   Based on the temperature measurement information of the temperature measurement means (temperature sensor 17) provided in the load side refrigerant passage 6, Instead of the configuration for detecting the inflow of the cold storage refrigerant below the freezing point into the cargo side refrigerant passage 6, originally, In the cold storage operation of blocking the inflow of the refrigerant into the load side refrigerant passage 6, the sub-freezing refrigerant for cold storage When the refrigerant flows into the load-side refrigerant passage 6, the refrigerant flow in the load-side refrigerant passage 6 is initially generated. As a result, the cold storage ice in the load-side refrigerant passage 6 is reduced due to a decrease in the refrigerant flow rate in the bypass refrigerant passage 7. This is because the refrigerant flow rate changes in each part of the device refrigerant path due to the in-point refrigerant inflow. Of the refrigerant flow rate measuring means provided in the load side refrigerant path 6 and the bypass refrigerant path 7 etc. By detecting based on the measurement information, the cold storage refrigerant flow for cold storage to the load side refrigerant passage 6 It may be configured to detect the entry.

[0034]   When the inflow of the cold storage sub-freezing refrigerant into the load side refrigerant passage 6 is detected, the operation of the refrigerator 4 is performed. Stop the flow of refrigerant into the heat storage tank 3 and block the flow of refrigerant into the bypass path. It may also be circulated through 8.

[0035]   In addition, in order to make it easier to compare with the drawings, a code is added to the section of the scope of claims for utility model registration. However, the present invention is not limited to the configuration of the accompanying drawings by this entry.

[Brief description of drawings]

FIG. 1 is a device configuration diagram showing a refrigerant circulation form during cold storage operation.

FIG. 2 is a diagram showing a refrigerant circulation form during cold heat consumption operation.

[Explanation of symbols]

3 Cold storage means 4 refrigerator 5 Load side heat exchanger 6 Load side refrigerant path 7 Detour refrigerant path 9 valves 12A detection means 17 Temperature measuring means

Claims (3)

[Scope of utility model registration request] 1. A load side refrigerant passage (6) having a load side heat exchanger (5) interposed therein, a cold storage means (3), a refrigerator (4) for cooling the refrigerant below freezing in a cold storage operation, A valve (9) for opening and closing the load side refrigerant passage (6) and a bypass refrigerant passage (7) for the load side refrigerant passage (6) are provided, and the load side refrigerant passage is opened with the valve (9) open. (6), the cold energy consumption operation of circulating the refrigerant between the cold storage means (3) and the refrigerator (4), and the cold storage means via the bypass refrigerant passage (7) with the valve (9) closed. A cold storage type cold heat supply device for selectively performing a cold storage operation of circulating a refrigerant between (3) and the refrigerator (4), wherein the cold storage operation is performed to the load side refrigerant passage (6) during the cold storage operation. A cold storage type cold heat supply device provided with a detection means (12A) for detecting the inflow of a sub-freezing refrigerant for cold storage. 2. The cooling means for detecting the inflow of a sub-freezing refrigerant for cold storage based on temperature measurement information of a temperature measuring means (17) provided in the load side refrigerant passage (6). The regenerator type cold heat supply device described. 3. The cold-storage cold heat supply apparatus according to claim 1, wherein the detection means (12A) detects the inflow of the sub-freezing refrigerant for cold storage based on the measurement information of the refrigerant flow rate measuring means.