JP2008256272A - Heat consumer device of regional cooling-heating system and its operating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a peak value of a cooling load in cooling in summer, and to reduce a peak value of a heating load in heating in winter. <P>SOLUTION: The device is provided with a cold storage device 15 for heat-exchanging a cold heat medium 1 and water W by a cold storage heat exchanger 14 and storing cold in a cold storage tank 13, a cold take-out device 20 for heat-exchanging the water W of the cold storage tank 13 and a cold take-in medium 5 and cooling the cold take-in medium 5 by the cold of the cold storage tank 13, and a heat recovery refrigerator 28 for taking in a warm heat take-in medium 10 and water W of the cold storage tank 13 and simultaneously performing both of heating of the warm heat take-in medium 10 and cooling of the water W of the cold storage tank 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat consumer device of a district cooling and heating system for using a heat medium such as hot water, steam, and cold water supplied from a heat source by a district heating and cooling system (DHC) for cooling and heating and hot water supply. It relates to the driving method.

  In the district cooling and heating system (DHC), cooling and heating media such as cold water, low-temperature water, medium-temperature water, high-temperature water, and steam are manufactured by the cooling and heating plants (heat sources) provided for each region, and are distributed within limited areas through regional piping Heat is supplied by circulating and supplying a cooling medium and a heating medium to the heat consumers. There are cases where only one kind of heat medium is circulated and there are cases where a plurality of heat mediums are used in combination. In general, a cooling medium for cooling and a heating medium for heating are used. The heat medium supplied from the heat source is generally heat-exchanged by a main heat exchanger provided in each heat consumer and used for cooling, heating, hot water supply, and the like.

  The usage fees paid by heat consumers to the district heating and cooling system operators are the total of the basic fee based on the contract heat amount and the pay-as-you-go fee that varies according to the amount of heat used for each heating medium. . Here, the basic charge is determined based on the peak values of the cooling load and the heating load used by the heat consumers, and the basic charge occupies a considerable proportion of the annual air conditioning energy cost excluding power.

  In the above-mentioned conventional district heating and cooling system, from the standpoint of the heat consumer who is the user, the peak value of the cooling load and heating load of each consumer varies significantly depending on the season and time zone. The amount of cold and heat that you want to receive and the amount of heat that you want to receive from the heating medium reach the peak value of each load for several hours or tens of hours throughout the year. It is about 30% or less of the capacity amount corresponding to the peak value of the set load.

  Therefore, each heat consumer pays a high basic fee set based on the peak load value in a short period of time as described above. However, while being recognized as being excellent in terms of environment, safety, etc., it has been a factor that is difficult to spread.

  Therefore, each heat consumer can make the district cooling and heating system easier to use by reducing the basic charge by reducing the maximum amount of cold heat that is desired to be supplied from the cooling medium and the amount of heat that is desired to be supplied from the heating medium. It is hoped that.

In order to solve this problem, cold water is generated by cooling the water in the cold storage tank that stores cold heat from the heat source and the auxiliary cold storage tank provided in parallel with the cold storage tank, to heat consumers in the district heat source system. There is known an apparatus that is configured to provide cold heat in series to a cooling medium circulating in the heat load side, for example (see Patent Document 1).
JP 05-26480 A

  In the district heat source system shown in the above-mentioned Patent Literature 1, for cold water generation, heat is stored in a cold storage tank for storing cold heat from the heat source and water in an auxiliary cold storage tank provided in parallel with the cold storage tank. It is equipped with an auxiliary chiller and is configured to provide cold heat in series to the cooling medium circulating on the heat load side, so that cold heat is stored at night in the summer and stored at the peak of the daytime cooling load in the summer. By using the cold stored in the tank and the auxiliary cold storage tank, the peak value of the cooling load in summer can be set low.

  However, no consideration is given to reducing the energy peak value of the heating load during heating in winter, especially at the start-up in the morning, so that each heat consumer has the peak value of the heating load during heating in winter. There was a problem that it was necessary to pay a high basic fee accordingly.

  The present invention has been made in view of the above circumstances, and reduces the heat supply amount of the cooling medium that is circulated and supplied from the air conditioning plant (heat source) to the heat consumers through the regional piping during the cooling in summer, The present invention seeks to provide a cooling medium that is circulated and supplied from a heat source to a heat consumer from a heat source in the winter season and a heat consumer device of a district heating and cooling system that can reduce the heat supply amount of the heating medium, and an operation method thereof. .

The present invention guides the cooling medium and the heating medium from the heat source to each consumer in the region, cools the cooling heat intake medium by the cooling heat of the cooling medium through the cooling main heat exchanger provided for each consumer, and cooling load To supply heat to the heating load by heating the hot medium with the heat of the hot medium through the hot main heat exchanger provided for each consumer. A heat consumer device of a district cooling and heating system in which there is a cooling load to be supplied after cooling,
A cold storage device that heat-exchanges the cold medium and water pumped from the cold storage tank via a cold storage heat exchanger to store cold in the cold storage tank;
A cold heat extractor that takes out the water pumped from the cold storage tank and the cold heat intake medium through a heat exchanger and cools the cold heat intake medium with the cold heat of the water in the cold storage tank;
A heat consumer device for a district heating and cooling system, comprising a heat recovery refrigerator that takes in the water from the heat intake medium and the cold storage tank and simultaneously heats the heat intake medium and cools the water in the cold storage tank , Related to

The present invention relates to a heat consumer device for a district cooling and heating system according to claim 1,
During the summer night, the cold storage device is operated to store the cold energy in the cold storage tank,
In the summer daytime, in addition to cooling the cold intake medium through the cold heat main heat exchanger by the cold heat of the cold medium, by operating the cold extractor and cooling the cold intake medium by the cold energy of the cold storage tank, The present invention relates to a method for operating a heat consumer device of a district cooling and heating system, characterized in that the peak value of the cooling energy of the cooling medium consumed for cooling the cooling heat intake medium is reduced through the cooling heat main heat exchanger.

The present invention relates to a heat consumer device for a district cooling and heating system according to claim 1,
When starting up in the morning in the winter season, in addition to heating the heat intake medium through the main heat exchanger by the heat of the heat medium, the temperature of the return side from the cooling load of the heat intake medium on the previous day is also measured. Operate the heat recovery refrigerator using the return water stored in the cold storage tank via the cold storage heat exchanger as the evaporator side heat source, and heat the heat intake medium with the heat generated on the condenser side of the heat recovery refrigerator,
During the daytime in winter, while operating the heat recovery refrigerator using the return water that stores the heat in the cold storage tank as the evaporator heat source and heating the heat intake medium with the heat generated on the condenser side of the heat recovery refrigerator, In addition to cooling the cold heat intake medium through the cold heat main heat exchanger with the cold heat of the cold medium, the cold heat extractor is operated and the cold heat intake medium is cooled with the cold heat of the cold storage tank and returned to the cold storage tank. Store the heat of water,
During the winter night, the water drawn from the cool storage tank and the cold heat intake medium are heat exchanged via the heat extractor of the cold heat extractor to cool the cold heat intake medium and simultaneously returned to the cold storage tank by the cold heat extractor. Heat consumers of district cooling and heating systems, characterized by reducing the peak temperature of the heating medium spent on heating the heating medium via the heating main heat exchanger by operating to store the temperature of the water This relates to an operation method of the apparatus.

The present invention relates to a heat consumer device for a district cooling and heating system according to claim 1,
When there is an intermediate heating load and the heating load is smaller than the cooling load,
The heat recovery refrigerator is operated using the return water stored in the cold storage tank as the heat source on the evaporator side, and the heat intake medium is heated by the heat generated on the condenser side of the heat recovery refrigerator. In addition to cooling the cold heat intake medium via the cold heat main heat exchanger, the cold heat extractor is operated to cool the cold heat intake medium with the cold heat of the cold storage tank and store the heat in the cold storage tank to store the cold It is characterized by reducing the peak value of the temperature of the heating medium consumed for heating the heating medium via the heating main heat exchanger by performing an operation of adjusting the heat transfer balance of the tank in units of one day. The present invention relates to a method for operating a heat consumer device of a district cooling and heating system.

  According to the heat consumer device and the operation method of the district cooling and heating system of the present invention, the maximum value of the cooling medium that is circulated from the heat source during cooling in the summer to the heat consumer through the local piping is reduced, and the heat source is used in the winter. Can reduce the maximum value of the cooling medium that is circulated and supplied to the heat consumers through the regional piping and the heat supply amount of the heating medium, thereby reducing the basic charge when the heat consumers use the district heating and cooling system An excellent effect can be achieved.

  In addition, the integrated value of the amount of heat supplied from the heat source through the local piping to the heat consumers from the heat source in the intermediate and winter seasons is reduced by the amount of heat recovered from the cooling load and heating load by the heat recovery refrigerator. In addition, it is possible to save energy or reduce carbon dioxide generation by reducing the energy used by the heat recovery heat pump.

  In addition, when heating and cooling are required in winter, the heat recovery medium can be used to heat the heat intake medium and at the same time to store the cold energy in the cold storage tank. By cooling, it is possible to create a time zone in which cooling and heating can be performed every day without using the cooling heat of the cooling medium and the heating medium, thereby reducing the usage fee.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a schematic configuration diagram showing an example of an embodiment of the present invention. In FIG. 1, a cooling medium 1 of 6 ° C. is supplied from a heat source to each heat consumer via a regional pipe, and when cold heat is used by a heat consumer, the return-side cooling medium 1 ′ is, for example, It is heated to 13 ° C. and returned to the heat source. On the other hand, when cold heat is not used by a heat consumer, the supply of the cold medium 1 at 6 ° C. is stopped by the action of some control valves 7a of the temperature regulator 7 described later.

  Further, a 55 ° C. heating medium 2 is supplied from the heat source to each heat consumer via a regional pipe, and when the heat consumer uses the heat, the return-side heating medium 2 ′ is 47 ° C., for example. The temperature drops to the heat source. On the other hand, when heat is not used by a heat consumer, the supply of the heating medium 2 at 55 ° C. is stopped by the action of some control valves 12a of the temperature regulator 12 described later.

  Each heat consumer is equipped with a cold heat main heat exchanger 6, and a cold heat intake medium 5 of, for example, 15 ° C. of the cooling load 3 such as a cooling machine provided for each heat consumer is exchanged by the pump 4 with the cold heat main heat exchange. Heat is exchanged with the cold medium 1 at 6 ° C. supplied to the vessel 6, and is supplied to the cooling load 3 as a cold intake medium 5 ′ cooled to 7 to 8 ° C. In the cold heat main heat exchanger 6, the temperature of the cold heat intake medium 5 ′ supplied to the cooling load 3 is adjusted by adjusting the flow rate of the cold heat medium 1 with the control valve 7 a based on the temperature of the cold heat intake medium 5 ′. For example, a temperature controller 7 is provided which always maintains a set temperature of, for example, 7 ° C. and applies appropriate cooling heat to the cooling load 3.

  Each heat consumer is provided with a heat main heat exchanger 11, and a heat intake medium 10, for example, 40 ° C. of a heating load 8 such as a heater provided for each heat consumer is pumped by a pump 9. The heat exchange medium 11 is supplied to the heat exchanger 11 to exchange heat with the 55 ° C. heating medium 2, and is supplied to the heating load 8 as a heat intake medium 10 ′ heated to 50 ° C. In the heat main heat exchanger 11, the temperature of the heat intake medium 10 'supplied to the heating load 8 is adjusted by adjusting the flow rate of the heat medium 2 with the control valve 12a based on the temperature of the heat intake medium 10'. For example, a temperature controller 12 is provided which is always kept at a set temperature of, for example, 50 ° C. and applies appropriate heat to the heating load 8.

  In the above configuration, the heat consumer includes a cold storage tank 13 in which water W is stored, and a cold storage heat exchanger 14 that exchanges heat between the cold storage medium 1 and the water W pumped from the cold storage tank 13 by the pump 13a. A cold storage device 15 is provided, and the cold heat of the cold medium 1 is stored in the water W of the cold storage tank 13 by the operation of the cold storage device 15. The cold storage heat exchanger 14 always adjusts the water W supplied to the cold storage tank 13 to a set temperature of, for example, 7 ° C. by adjusting the flow rate of the cooling medium 1 with the control valve 16a based on the temperature of the cooled water W. The temperature controller 16 to hold | maintain is provided.

  Further, between the cold storage tank 13 and the cold heat intake medium 5, 5 ′, heat exchange is performed between the water W supplied from the cold storage tank 13 by the pump 17 and the cold heat intake medium 5 supplied by the pump 18. A cold heat take-out device 20 having a take-out heat exchanger 19 adapted to supply (dissipate heat) the cold heat of the cold storage tank 13 to the cold heat take-in medium 5 ′ is provided. In the extraction heat exchanger 19, the temperature of the cooled heat intake medium 5 ′ is always set to, for example, 8 ° C. by adjusting the flow rate by the pump 17 based on the temperature of the cooled cold intake medium 5 ′. A temperature controller 21 that holds the set temperature is provided.

  In the figure, reference numeral 22 denotes a cold heat controller. The cold heat controller 22 receives a temperature signal 23a of the cold heat intake medium 5 ', a temperature signal 23b of the cold heat intake medium 5, and a flow rate signal 23c of the cold heat intake medium 5. Then, the cooling load is calculated in the cooling controller 22, and the peak contract cooling medium heat quantity value 23d (fixed) is input to the cooling controller 22 and the morning / day / night schedule 23e is input to the timer. Furthermore, a heat controller operation state signal 36a from a heat controller 34 described later and a heat storage amount signal 24 from a heat storage amount calculator 37 described later are input. The cooling controller 22 outputs a control signal 25 a of the pump 4, a control signal 25 b of the pump 13 a, and a control signal 25 c of the pump 18, and also supplies a cooling controller to the heating controller 34. An operation state signal 25d and a cooling load calculation value 25e are output.

  In the figure, reference numeral 34 denotes a thermal controller. The thermal controller 34 includes a thermal controller operation state signal 25 d from the cold controller 22, a cooling load calculation value 25 e, and a heat storage amount signal 24 from the heat storage amount calculator 37. , The temperature signal 35a of the heat input medium 10 ', the temperature signal 35b of the heat input medium 10, and the flow rate signal 35c of the heat input medium 10 are input. The peak contract heating medium heat quantity value 35d, the cooling / heating capacity signal 35e of the heat recovery refrigerator, and the morning / day / night schedule 23e are input. The thermal controller 34 outputs a thermal controller operating state signal 36a to the cold controller 22 and also outputs a control signal 36b of the pump 9 and control signals 36c of pumps 26 and 27 described later. ing.

  In the figure, reference numeral 37 denotes a heat storage amount calculator, and a temperature detection signal 39 from a temperature detector 38 provided in the cold storage tank 13 and a heat storage amount shortage determination value 40 are input to the heat storage amount calculator 37. The heat storage amount is calculated, and the heat storage amount signal 24 is output to the cooling controller 22 and the heat controller 34. As shown in FIG. 1 a, the inside of the cold storage tank 13 is partitioned into a plurality of rooms 41 that communicate with each other, and cold heat is stored from one of the rooms 41 toward the other. The amount of heat stored in the cold storage tank 13 is obtained by detecting the temperature of the water W in each room 41 with the temperature detector 38 provided. For example, regarding the detected temperature of each temperature detector 38, when 90% of the number of detectors reaches the set temperature (7 ° C.) from a high temperature, it is determined that the battery is fully stored.

  On the other hand, between the cold storage tank 13 and the thermal intake medium 10, 10 ′ in FIG. 1, the thermal intake medium 10 is taken in by the pump 26 and the water W in the cold storage tank 13 is taken in by the pump 27. A heat recovery refrigerator 28 is provided. In the heat recovery refrigerator 28, the temperature of the water W supplied to the cold storage tank 13 is always maintained at a set temperature of, for example, 7 ° C. by adjusting the pump 27 based on the temperature of the water W supplied to the cold storage tank 13. A temperature controller 29 is provided.

  As shown in FIG. 2, the heat recovery refrigerator 28 includes a compressor 30, a water-cooled condenser 31, and a water cooler 32 (evaporator), and uses a gaseous heat medium as the compressor 30. The water medium is pressurized and led to the water-cooled condenser 31, and the heat medium is liquefied by cooling with the hot-water intake medium 10 at 40 ° C. in the water-cooled condenser 31, and the liquid is expanded by the expansion valve 33 to the water cooler 32. The heat of the water W at 14 ° C. is taken away by the latent heat that the liquid vaporizes, so that the water W is cooled to 7 ° C. and supplied to the cold storage tank 13. At this time, the 40 ° C. heat intake medium 10 supplied to the water-cooled condenser 31 absorbs heat due to heat generated when the gas is liquefied, and is returned as a 50 ° C. heat intake medium 10 ′.

  Therefore, the heat recovery refrigerator 28 can simultaneously perform cold heat storage in the cold storage tank 13 and heating of the heat intake medium 10.

  Next, the operation of the above embodiment will be described.

  The present invention relates to a case where there is a cooling load on the consumer side that should cool and supply the cold intake medium throughout the year. In the following, for example, in the Kanto region, in the summer season (June-September), the mid-term season (March-May and October, November), and the winter season (December-February) Buildings that have a start time of 9 o'clock and an end time of 19:00, such as a building that takes 1 hour to rise and runs for 1 hour from the end time (in this case, the winter morning period starts at 8 o'clock) The heating rise time is 11:00, the daytime is from 11:00 to 20:00 (from 8 to 20:00 except for winter), the night is from 20:00 to the next day at 8am, and holidays are considered to be night) The operation pattern will be described. Of course, the same applies when the time and time change depending on the purpose and area of the building.

  FIG. 3 is a flowchart showing the operation when step S1 for determining the summer period and the intermediate period / winter period is determined to be the summer period, and the intermediate period / winter period not determined to be the summer period is operated according to the flowchart of FIG.

  In the summer shown in FIG. 3, the calculation / determination is mainly performed by the cooling / heating controller 22, but the daytime (8: 00: 00: 00) or night (20: 00: 00-8: 00) is determined in step S <b> 2. In the case of daytime, the heat consumer cooling load total a in step S3 (the total amount of heat calculated by the flow rate and temperature difference of each system, that is, the difference between the flow signal 23c in all systems and the temperature signals 23a and 23b) Is compared with the peak contract cold medium heat quantity value b (23d in FIG. 1), and if a ≧ b, the cold extractor 20 is operated as in step S4 and the cold storage heat dissipation in the regenerator 13 + DHC (district cooling / heating) System) (that is, cooling the cold intake medium through the main heat exchanger and supplying it to the cooling load by cooling the cold medium from the heat source) and exceeding the peak contract cold medium heat value b Pumps 17 and 18 To control along with the flow. If a <b, the cold heat utilization of the DHC is continued without operating the cold heat extractor 20 as in step S5.

  In the case of night, the total heat demander cooling load “a” is compared with the peak contract cooling medium heat quantity value “b” in step S6. If a ≧ b, the cold storage device 20 is operated by operating the cooling / heat extraction device 20 as in step S7. The pumps 17 and 18 are controlled together with their flow rates so as not to exceed the peak contract cold medium heat quantity value b by using 13 cold heat radiation + DHC cold utilization. However, step S7 does not normally occur. If a <b in step S6, the total heat demander cooling load a + the heat storage load (the maximum amount of cold energy that can be taken out when the cold storage tank is fully stored is subtracted from the calculated amount of heat storage shown in 24 as in step S9. The load obtained by dividing the amount of cold energy by the remaining night time is compared) and the peak contract cold medium heat amount value b is compared. If a + heat storage load <b, the cold storage device 15 is operated as in step S10 ( The pump 13a is operated at a constant flow rate), and cold energy is stored in the cold storage tank 13. However, heat is not stored when the next day is a holiday (only when the next day is a weekday). In step S11, when 90% of the plurality of temperature detected by the temperature detector 38 of FIG. 1a reaches the set temperature (7 ° C.), it is determined that the battery is fully stored. (In this case, the heat storage shortage determination value is defined by the ratio of the number of detected temperatures, but may be defined based on the heat storage amount calculated by the heat storage amount calculator 37.) In step S9, a + heat storage If load> b, no heat is stored.

  The end of step S12 usually returns to the start when NO is determined. Here, the determination of YES means that the entire system is stopped. There is no period to apply only for New Year holidays. The system is operating at night.

  In the intermediate period / winter period (signal A) shown in FIG. 4, the calculation and determination are performed by both the cooling controller 22 and the heating controller 34. In step S13, the temperature signals 35a and 35b and the flow signal 35c are measured. The value is calculated to determine the presence or absence of the heating load. If there is no heating load, the process returns to step S2 in FIG.

  When a heating load is generated, first, an operation signal is sent to the cooling / heat extraction device 20 to supply a cooling / heating intake medium to the cooling load. The total amount of heat calculated by the flow rate signal 35c of all systems and the difference between the temperature signals 35a and 35b) and the heating capacity d (initial input 35e) of the heat recovery refrigerator 28 are compared. As in step S15, heating operation is performed only for the heat recovery refrigerator 28 (which refers to a refrigerator system in which the pump 27 and the pump 26 also operate in conjunction) (capacity control of the heat recovery refrigerator 28 alone is built in the main body. It has a circuit that measures the outlet or inlet water temperature of the heat recovery refrigerator 28 alone and controls the capacity of the refrigerator itself.) If c> d, the operation of the heat recovery refrigerator 28 and the utilization of the DHC heat (ie, the heat intake medium is cooled by the heat of the heat medium from the heat source through the heat main heat exchanger in step S16 to the heating load). Supply).

  Further, in step S17, the cooling capacity e (initial input 35e) of the heat recovery refrigerator 28 and the heat consumer cooling load total a (flow rate and temperature difference of each system (that is, the flow signal 23c of all systems and the temperature signal 23a) , 23b)), and if e ≧ a (that is, the state of rising in the morning in winter), whether or not the cold storage tank 13 is fully stored in step S18 is the same as in step S11. If it is determined by the method and the cold storage tank is fully charged, the heat recovery refrigerator 28 is stopped to protect the heat recovery refrigerator 28 in step S19 to use the DHC heat. If the cold storage tank is not fully charged, the heating capacity of the heat recovery refrigerator is utilized while operating the heat recovery refrigerator 28 to store the cold energy in the cold storage tank 13 as in step S20. This is because, by using the cool storage tank, the cool storage tank absorbs the remaining cool heat as a buffer even if the cooling load <the cooling capacity of the heat recovery refrigerator 28, so that the heat recovery refrigerator 28 is used according to the heating load. 1 can be operated, the time during which the heat recovery refrigerator 28 can be operated becomes longer than when only the heat recovery refrigerator 28 is installed without the cold storage tank 13 different from the configuration of FIG. Therefore, by using the cold storage tank 13, it is possible to reduce the basic heat charge and reduce the amount of cold / heat used.

  If e <a in step S17 (that is, the daytime in winter or the daytime in the intermediate period), whether or not the cold storage heat can be used as in step S21 (that is, whether or not the cold-heat extraction device 20 can be operated) If 10% or more of the number of detected temperatures by the temperature detector 38 installed in the cold storage tank 1a is less than the set temperature (for example, 7 ° C.), it is determined that it can be used. As in step S22, the operation of the heat recovery refrigerator 28 is continued, and the operation of the cold heat extractor 20 is also continued (outputting an operation request signal) to dissipate the cold heat in the cold storage tank 13, and at this time according to the cooling load. The pumps 17 and 18 are controlled together with their flow rates. The shortage of cold heat is assumed to be DHC cold use (that is, the pump 4 is operated and controlled by the temperature regulator 7) as in step S23. If the use of regenerative heat is not possible in step S21, that is, if 90% or more of the number of detectors of the temperature detected by the temperature detector 38 installed in the regenerator 13 exceeds a high set temperature (for example, 14 ° C.) After the take-out device 20 is stopped, the DHC is used as cold energy as in step S23.

  The end of step S24 normally returns to the start of FIG. Here, the determination of YES means that the entire system is stopped.

  In FIG. 3, when cold storage is performed in the cold storage tank 13 using nighttime electric power, it has been described that the night is normally from 22:00 to 8:00 the next morning, but in this embodiment, the cooling medium 1 of the district cooling and heating system is used. In addition, there is no set time, and it may be, for example, from 19:00 to 8:00, and can be set according to the form of heat use by heat consumers.

  The operation method of the heat consumer device of the district cooling and heating system will be described with reference to FIGS. In each figure, the operating route is shown by a thick line.

  FIG. 5 shows the operation at night in the summer. The cold storage device 15 is operated, and the cold storage medium exchanger 14 exchanges heat between the cold medium 1 and the water W drawn from the cold storage tank 13 to reach 7 ° C. Returning the cooled water W to the cold storage tank 13 is repeated to store heat. The heat storage is controlled based on a signal calculated by the heat storage amount calculator 37 such as the ratio of the number of detectors of the temperature detected by the temperature detector 38 installed in the cold storage tank 13. The cooling heat supplied to the cooling load 3 side at night operates the pump 4 and cools the cooling heat intake medium 5 by the cooling heat of the cooling medium 1 under the control of the temperature regulator 7 through the cooling heat main heat exchanger 6. At this time, the pump 4 is controlled together with the flow rate according to the cooling load.

  FIG. 6 shows the operation during the daytime in the summer. The cold storage device 15 is stopped, the pump 4 is operated, and the cold heat intake medium 5 is cooled by the cold heat of the cold medium 1 by the cold heat main heat exchanger 6. Under the control of 7, the cold intake medium 5 is cooled by the cold heat of the cold medium 1. At this time, in addition to controlling the pump 4 together with its flow rate according to the cooling load, the cold extractor 20 is operated to store the cold The cold energy stored in the tank 13 is radiated and the cold heat intake medium 5 is cooled via the heat extraction heat exchanger 19. At this time, the pumps 17 and 18 are controlled together with their flow rates according to the cooling load. At the same time, the warm heat of the return water returned to the cold storage tank by the cold energy extraction device 20 is stored in the cold storage tank 13.

  In this way, when the cooling load 3 in the daytime in summer is maximized, the cooling medium 1 is cooled for the cooling load 3 by cooling using the cooling heat of the cooling medium 1 serving as the heat source and the cooling heat stored in the cold storage tank 13. The peak value using is reduced.

  FIG. 11 shows the relationship between the cooling load and the amount of heat used in summer in the form of FIG. 1 with the heat amount RT (1RT is 3024 kcal / H) on the vertical axis and the time on the horizontal axis. The amount of cold usage received from the cooling medium 1 used by the heat consumer is indicated by a broken line, and the cold storage heat stored in the cold storage tank 13 is indicated by hatching. Here, while the cooling load is the amount of heat consumed (plus side), the amount of cold usage and the amount of cold storage heat are the amount of heat frozen by the refrigerator (minus side), but only the magnitude is shown as the absolute value of the amount of heat. ing. In FIG. 11, the peak value of the cooling load is 1500 RT, whereas the peak value of the amount of cooling energy used is suppressed to 1200 RT by the form of FIG. 1. Therefore, the contract heat amount may be 1200 RT instead of 1500 RT, and the basic charge based on the contract heat amount can be reduced. In order to reduce the amount of cold used by 1500 RT-1200 RT = 300 RT in order to radiate the cold stored in the cold storage tank 13 to the cold storage medium 5 during the summer daytime when the cooling load is high, the night cold storage device 15 is provided. It is operated for 9 hours, and 300 RT is stored for 2700 RT minutes (hatched portion) in 9 hours, and the stored heat is taken out by the cold heat take-out device 20 by 300 RT per hour (cross-hatched portion) in 9 hours in the daytime.

  FIG. 7 shows the operation when there is no midday and nighttime heating load. The cold storage device 15 and the cold extraction device 20 are stopped, the pump 4 is operated, and the cold heat is generated by the cold main heat exchanger 6. The cold intake medium 5 is cooled by the cold heat of the medium 1 under the control of the temperature regulator 7, and the cold heat intake medium 5 is cooled by the cold heat of the cold medium 1. At this time, the pump 4 is controlled along with the flow rate according to the cooling load. ing.

  At this time, as shown in FIG. 12, all of the cooling load is covered by the cooling energy (cooling energy consumption) of the cooling medium 1. This is because there is no heating load, so the heat generated when the heat recovery refrigerator 28 is operated (heating the heat intake medium) cannot be used, and there is no buffer for storing heat, so the heat recovery refrigerator 28 cannot be operated. It depends.

  FIG. 8 shows the operation when the cooling load is less than the heating load when starting up in the morning in winter. Here, regarding the distinction between morning, daytime, and nighttime, in the morning, it is from the start time minus the start-up time to about 11:00 (heating start-up end time). For example, when the start time is 9:00 and the start-up time is 1 hour, it is 8:00 to 11:00. In the daytime, it is 11:00 to 10:00, and the end time is about 1 hour, for example, 11:00 to 19:00. Also, the night can be set, for example, from 19:00 to 8:00 the next day, but it goes without saying that it varies depending on the use of the building and the area.

  In FIG. 8, at the time of start-up, the heat recovery refrigerator 28 is operated in addition to operating the pump 9 and heating the heat intake medium 10 by the heat of the heat medium 2 by the heat main heat exchanger 11. Thus, the heat intake medium 10 is heated by the 50 ° C. heat generated by the heat recovery refrigerator 28 and supplied to the heating load as the heat intake medium 10 ′. On the other hand, the heat recovery refrigerator 28 can be operated with the temperature of 14 ° C. of the return water of the regenerator 13 that dissipated the cold the night before as an evaporator-side heat source, and as a result of the operation as a heat pump as a result of heating the heat intake medium. Then, the water W having a heat of 14 ° C. drawn from the cold storage tank 13 is repeatedly cooled to 7 ° C. and returned to the cold storage tank 13 to store heat. Whether or not the use of cold storage heat is possible (that is, whether or not the cold heat extraction device 20 can be operated) is 10% or more of the number of detected temperatures detected by the temperature detector 38 installed in the cold storage tank 13 is equal to or lower than the set temperature (eg, 7 ° C.) It is judged that the case where it has become can be used, and the cold energy intake medium 5 can be cooled by the cold energy stored in the cold storage tank 13 by operating the cold energy extractor 20. Thereby, the cooling load in winter can be covered by stopping the pump 4 and operating only the cooling / heat extraction device 20 without using the cooling heat of the cooling medium 1.

  In this way, when the heating load 8 in the morning in the winter season is maximized, the heating load 8 is heated by using the heat of the heat source 2 and the heat of the heat recovery refrigerator 28 to heat the heating load 8. The peak value using the medium 2 can be reduced.

  In FIG. 13, the winter heating load and the heat recovery refrigerator heating capacity in the form of FIG. 1 are shown in relation to the amount of heat RT on the vertical axis and the time on the horizontal axis, and the heating load is shown by a solid line, The heating capability of heating the heat intake medium 10 by the heat recovery refrigerator 28 is indicated by a broken line, and the amount of heat used received from the heat medium 2 used by the heat consumer is indicated by a dotted area. From this, the heating load can be covered by the heating capacity of the heat recovery refrigerator 28 except during peak hours in the daytime. Accordingly, the morning peak value of the heating load is 700 RT, and the heating capacity of the heat recovery refrigerator 28 at the peak time. The usage amount of heat received from the heating medium 2 can be reduced to 300 RT minus 400 RT, and the contract heat amount may be 300 RT instead of 700 RT, and the basic charge based on the contract heat amount can be reduced.

  FIG. 9 shows the operation when the cooling load is greater than the heating load during the daytime in the winter period or the daytime in the intermediate period. By operating the heat recovery refrigerator 28, the temperature of 50 ° C. generated by the heat recovery refrigerator 28 is shown. The heat intake medium 10 is heated and supplied to the heating load as a heat intake medium 10 ′. On the other hand, the heat recovery refrigerator 28 can be operated with the temperature of 14 ° C. of the return water of the regenerator 13 that dissipated the cold the night before as an evaporator-side heat source, and as a result of the operation as a heat pump as a result of heating the heat intake medium. Then, the water W having a heat of 14 ° C. drawn from the cold storage tank 13 is repeatedly cooled to 7 ° C. and returned to the cold storage tank 13 to store heat. Further, the cold energy stored in the cold storage tank 13 and the cold energy additionally stored in the heat recovery refrigerator 28 are taken out by operating the cold energy extraction device 20, and the cold energy intake medium is cooled and supplied to the cooling load. The processing heat quantity of the cooling load that is insufficient even in this operation causes the cooling medium intake medium 5 to be cooled in parallel by operating the pump 4 so as to use the cooling energy of the cooling medium 1.

  FIG. 14 shows the relationship between the cooling load and the cooling capacity of the heat recovery refrigerator in the form of FIG. 1 on the vertical axis in terms of heat quantity RT and the time on the horizontal axis, and the cooling load is indicated by a solid line. The cooling capacity for cooling the cold intake medium 5 by the heat recovery refrigerator 28 is indicated by a broken line. As a result, as shown in FIG. 14, when the cooling load indicated by the solid line is used to cool the cooling capacity of the heat recovery refrigerator 28 to the maximum, and the shortage is cooled by the cooling heat of the cooling medium 1. The usage amount of the cold heat of the medium 1 can be minimized, and the usage fee for the contract heat amount can also be reduced.

  FIG. 10 shows the operation at night in the winter, and the stored heat in the cold storage tank 13 is radiated to the cold intake medium 5 by operating the cold extractor 20. Then, the heat recovery refrigerator 28 is stored at a predetermined amount or more so that the heat recovery refrigerator 28 can be operated at the start-up of the winter morning of the next day, and the evaporator-side heat source of the heat recovery refrigerator 28 is stored. Make it available as

  As described above, according to the heat consumer device of the district cooling and heating system of the present invention and the operation method thereof, the peak value of the cooling load during the cooling in summer and the peak value of the heating load during the heating in winter are reduced. Therefore, it is possible to reduce the basic charge when the heat consumer uses the district cooling and heating system.

  In addition, when heating and cooling are required in winter, heat can be stored in the cool storage tank at the same time that heat is supplied by the heat recovery refrigerator, so the amount of cooling medium used can be reduced by supplying this cooling to the cooling load. Since this is possible, it is possible to reduce the fee.

  In addition, the heat consumer apparatus of the district air conditioning system of this invention and its operating method are not limited only to the said form, Of course, various changes can be added within the range which does not deviate from the summary of this invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole schematic block diagram of the heat consumer apparatus of the district heating / cooling system as an example which implements this invention. It is a side view which shows an example of the method of calculating | requiring the heat storage amount of the cool storage tank of FIG. It is a block diagram which shows an example of the heat | fever recovery refrigerator in FIG. It is a driving | operation flowchart in case only the cooling load in summer is used. It is an operation | movement flowchart in the case of using both the air_conditioning | cooling load and heating load in a middle period and winter. It is an operation | movement figure which shows the driving | operation at night of the summer. It is an operation | movement figure which shows the driving | operation of the daytime of summer. It is an operation | movement figure which shows the driving | operation when the air_conditioning | cooling of the daytime and night of an intermediate period is required and there is no heating load. It is an action | operation figure which shows the driving | operation at the time of start-up of the morning of winter. It is an action | operation figure which shows the driving | operation in the daytime of winter. It is an operation | movement figure which shows the driving | operation at night of the winter season. It is a diagram which shows the relationship between the cooling load in the form of FIG. It is a diagram which shows the relationship between a cooling load and the amount of cold usage. It is a diagram which shows the relationship between a heating load and heat recovery refrigerator heating capacity. It is a diagram which shows the relationship between a cooling load and heat recovery refrigerator cooling capacity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 'Cold medium 2,2' Heat medium 3 Cooling load 5,5 'Cold heat intake medium 6 Cold heat main heat exchanger 8 Heating load 10,10' Heat intake medium 11 Heat main heat exchanger 13 Cold storage tank 14 Cold storage heat exchanger 15 Cold storage device 19 Extraction heat exchanger 20 Cold extraction device 28 Heat recovery refrigerator W Water

Claims (4)

The cooling medium and the heating medium from the heat source are guided to each consumer in the region, and the cooling heat intake medium is cooled by the cooling heat of the cooling medium through the cooling main heat exchanger provided for each consumer and supplied to the cooling load. The heat intake medium is heated by the heat of the heat medium through the heat main heat exchanger provided for each consumer and supplied to the heating load. The heat consumer side cools the heat intake medium throughout the year. A heat consumer device of a district cooling and heating system in which there is a cooling load to be supplied,
A cold storage device that heat-exchanges the cold medium and water pumped from the cold storage tank via a cold storage heat exchanger to store cold in the cold storage tank;
A cold heat extractor that takes out the water pumped from the cold storage tank and the cold heat intake medium through a heat exchanger and cools the cold heat intake medium with the cold heat of the water in the cold storage tank;
A heat consumer device for a district heating and cooling system, comprising a heat recovery refrigerator that takes in the water from the heat intake medium and the cold storage tank and simultaneously heats the heat intake medium and cools the water in the cold storage tank . In the heat consumer apparatus of the district heating and cooling system according to claim 1,
During the summer night, the cold storage device is operated to store the cold energy in the cold storage tank,
In the summer daytime, in addition to cooling the cold intake medium through the cold heat main heat exchanger by the cold heat of the cold medium, by operating the cold extractor and cooling the cold intake medium by the cold energy of the cold storage tank, A method for operating a heat consumer device of a district cooling and heating system, characterized in that the peak value of the cooling energy of the cooling medium consumed for cooling the cooling heat intake medium is reduced via the cooling heat main heat exchanger. In the heat consumer apparatus of the district heating and cooling system according to claim 1,
When starting up in the morning in the winter, in addition to heating the heat intake medium via the heat main heat exchanger by the heat of the heat medium, the heat on the return side from the cooling load of the heat intake medium the previous day is stored in the cold storage heat. The heat recovery refrigerator is operated using the return water stored in the cold storage tank via the exchanger as the evaporator-side heat source, and the heat intake medium is heated by the heat generated on the condenser side of the heat recovery refrigerator,
During the daytime in winter, while operating the heat recovery refrigerator using the return water that stores the heat in the cold storage tank as the evaporator heat source and heating the heat intake medium with the heat generated on the condenser side of the heat recovery refrigerator, In addition to cooling the cold heat intake medium through the cold heat main heat exchanger with the cold heat of the cold medium, the cold heat extractor is operated and the cold heat intake medium is cooled with the cold heat of the cold storage tank and returned to the cold storage tank. Store the heat of water,
During the winter night, the water drawn from the cool storage tank and the cold heat intake medium are heat exchanged via the heat extractor of the cold heat extractor to cool the cold heat intake medium and simultaneously returned to the cold storage tank by the cold heat extractor. Heat consumers of district cooling and heating systems, characterized by reducing the peak temperature of the heating medium spent on heating the heating medium via the heating main heat exchanger by operating to store the temperature of the water How to operate the device. In the heat consumer apparatus of the district heating and cooling system according to claim 1,
When there is an intermediate heating load and the heating load is smaller than the cooling load,
The heat recovery refrigerator is operated using the return water stored in the cold storage tank as the heat source on the evaporator side, and the heat intake medium is heated by the heat generated on the condenser side of the heat recovery refrigerator. In addition to cooling the cold heat intake medium via the cold heat main heat exchanger, the cold heat extractor is operated to cool the cold heat intake medium with the cold heat of the cold storage tank and store the heat in the cold storage tank to store the cold It is characterized by reducing the peak value of the temperature of the heating medium consumed for heating the heating medium via the heating main heat exchanger by performing an operation of adjusting the heat transfer balance of the tank in units of one day. Operation method of heat consumer device of district air conditioning system.

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