Multi-grade hot water supply circulating system and configuration method

Abstract

The invention discloses a multi-level hot water supply circulating system which comprises a hot water supply circulating system and a heat utilization system. According to the hot water supply circulating system, supply hot water of any multiple grades can be prepared by using simple equipment and a pipeline system, and a supply hot water specification can be added only by adding a hot water circulating pump, a regulating valve and an auxiliary pipeline system; the complexity of equipment and a pipeline system is greatly reduced, so that the investment of a factory and the occupied area of the equipment are also sharply reduced, and meanwhile, the hot water supply circulating system shares a whole set of heat utilization system, so that the investment of cooling facilities such as an air cooler and a heat exchanger is saved; when different grades of hot water are supplied, mutual interference does not exist in supply of the hot water, the hot water supply temperature is kept stable, a regulating valve and a hot water circulating pump are combined to serve as a main mode for cooling and mixing the hot water, a heat exchanger is not used, cooling measures are timely and efficient, and equipment investment is saved.

Description

Technical Field

[0001] The invention relates to the technical field of hot water supply, and in particular to a multi-level hot water supply circulation system. Background Art

[0002] In order to maintain a stable supply temperature, the traditional multi-level hot water supply system generally needs to include multiple independent circulation pumps, heat exchangers, air coolers, expansion tanks and associated piping systems. With the increasing number of users and hot water specifications, the required equipment also increases accordingly, and the complexity of the equipment and piping system also increases sharply, which greatly increases the investment and equipment footprint of the factory. At the same time, the traditional multi-level hot water supply system cannot recycle the heat generated in production. In order to ensure a stable hot water supply, most factories directly choose air coolers or cooling water coolers for cooling, which causes heat waste, especially for factories with large heat loads. If there are multiple levels of hot water supply in a factory, each hot water system is equipped with a lithium bromide unit, and the overall investment is too large, which is not conducive to the comprehensive and effective utilization of the heat of hot water. Therefore, it is necessary to provide a multi-level hot water supply system that is more flexible and extensible and can achieve efficient use of heat. Summary of the invention

[0003] Purpose of the invention: The technical problem to be solved by the present invention is to provide a multi-level hot water supply circulation system in view of the shortcomings of the prior art.

[0004] In order to solve the above technical problems, the present invention discloses a multi-level hot water supply circulation system, including a hot water supply circulation system and a heat utilization system, wherein:

[0005] The hot water supply circulation system comprises at least one group of hot water circulation pumps, each group of hot water circulation pumps corresponds to a group of users, the inlet of the hot water circulation pump is connected to the cold water supply main, the outlet of the hot water circulation pump is connected to the hot water inlet of the corresponding user, and the hot water outlet of the user is connected to the inlet of the hot water circulation pump and the cold water return main respectively;

[0006] The heat utilization system includes a cold water circulation pump, a heater, a lithium bromide unit, an air cooler and an expansion tank, wherein the inlet of the cold water circulation pump is connected to the cold water return main pipe, and the outlet of the cold water circulation pump is respectively connected to the inlet of the heater and the cold water inlet of the lithium bromide unit; the outlet of the heater is respectively connected to the cold water inlet and the cold water outlet of the lithium bromide unit; the cold water outlet of the lithium bromide unit is connected to the cold water inlet of the air cooler, the low-temperature water outlet of the lithium bromide unit is connected to the low-temperature water supply main pipe through a pipeline, and the low-temperature water inlet of the lithium bromide unit is connected to the low-temperature water return main pipe through a pipeline; the cold water outlet of the air cooler is connected to the cold water supply main pipe; the hot water outlet of the expansion tank is connected to the cold water return main pipe.

[0007] Among them, a temperature regulating valve is arranged on the connecting pipeline between the inlet of the hot water circulation pump and the cold water supply main; a shut-off valve is arranged on the connecting pipeline between the hot water outlet of each group of users and the cold water return main, and the shut-off valve and the above-mentioned temperature regulating valve are opened at the same time; and a safety valve is arranged on the outlet pipeline of each group of hot water circulation pumps.

[0008] The outlet temperature of the hot water circulation pump is independently set according to the user's usage requirements; the temperature level and quantity of the hot water at the outlet of the hot water circulation pump can be freely increased according to the user's requirements.

[0009] A flow regulating valve is arranged on the pipeline connecting the cold water supply main pipe and the cold water return main pipe. A flow meter is arranged on the cold water supply main pipe. The flow meter is used to adjust the cold water supply amount of the cold water supply main pipe and thus adjust the usage load of the entire system.

[0010] Preferably, the cold water circulation pump adopts a variable frequency motor.

[0011] A thermometer and an air cooler variable frequency motor are arranged on the cold water outlet pipeline of the air cooler, and the cold water outlet temperature of the air cooler is adjusted by the variable frequency motor of the air cooler.

[0012] Preferably, a temperature regulating valve is provided on the connecting pipelines of the cold water inlet and the cold water outlet of the lithium bromide unit. The present invention also proposes a configuration method of the above-mentioned multi-level hot water supply circulation system, comprising the following steps:

[0013] (1) Determine the flow rate and head of the hot water circulation pump according to the specifications and usage requirements of the hot water users and the piping system between the hot water circulation pump and the user. Similarly, summarize the relevant information of the hot water users and finally determine the hot water usage load of all users, thereby determining the working load of the air cooler;

[0014] (2) Determine the amount of cold water required by each hot water user in combination with the hot water temperature difference and flow rate of each hot water user. Similarly, summarize the relevant information of the hot water users, and determine the supply and return water temperature and cold water circulation volume of the cold water circulation system accordingly. Determine the head of the cold water circulation pump in combination with the pressure drop of the cold water pipeline and equipment, and finally determine the rated load of the lithium bromide unit and the low-temperature water supply and return water flow and temperature difference of the lithium bromide unit;

[0015] (3) In the heat utilization system, use the expansion water tank to replenish water to the pipes and equipment space in the system;

[0016] (4) In the heat utilization system, a heater and a thermometer installed on the outlet pipe of the heater are used to adjust the flow of the heating source to heat the cold water in the system to a specified temperature;

[0017] (5) In the heat utilization system, a flow control valve is installed on the pipeline connecting the cold water supply main pipe and the return water main pipe. A flow meter is installed on the cold water supply main pipe. The cold water supply volume of the cold water main pipe is adjusted by adjusting the opening of the flow control valve, thereby adjusting the use load of the entire system;

[0018] (6) In each group of hot water supply circulation system, the amount of cold water entering the hot water circulation pump inlet from the cold water supply main pipe can be adjusted by a temperature regulating valve installed on the connecting pipe between the cold water supply main pipe and the pump inlet, so as to control the temperature of the hot water after mixing through the hot water circulation pump;

[0019] (7) In the heat utilization system, a temperature regulating valve is installed on the connecting pipes of the cold water inlet and outlet of the lithium bromide unit. The regulating valve here can be used to adjust the amount of cold water entering the lithium bromide unit, thereby adjusting the operating load of the unit.

[0020] (8) In the heat utilization system, a thermometer installed on the cold water outlet pipeline of the air cooler is used to adjust the cold water outlet temperature of the air cooler through the frequency conversion of the air cooler motor.

[0021] The multi-level hot water supply circulation system of the present application is characterized by being composed of a hot water supply circulation system and a heat utilization system; the hot water supply circulation system includes a hot water circulation pump and an associated piping system; the heat utilization system includes a cold water circulation pump, a heater, a lithium bromide unit, an air cooler, an expansion water tank and an associated piping system; the hot water supply circulation system can be composed of several groups of hot water circulation pumps, and can produce multi-level hot water, the hot water circulation pump inlet is connected to the cold water supply and return water main pipe, the temperature of the hot water after mixing by the pump is adjusted by a temperature regulating valve in front of the hot water circulation pump, and the hot water is pumped to the corresponding user, and the hot water after use by the user continues to circulate to the hot water circulation pump inlet; the heat utilization system sends the cold water return water into the heater for heating by the cold water circulation pump, and then continuously cools the hot water to a specified temperature through the lithium bromide unit and the air cooler, and then sends it to the cold water supply main pipe, and the lithium bromide unit produces low-temperature water; the main advantage of the combination of these two systems is that the hot water supply circulation system can use simple equipment and piping systems to stably and efficiently produce multi-level hot water, and the heat utilization system can make full use of the large amount of heat generated by hot water users to continuously and stably produce cold water, thereby realizing efficient heat utilization.

[0022] Beneficial effects: Compared with the prior art, the advantages of the present invention are:

[0023] (1) The hot water supply circulation system of the present invention can produce any number of grades of hot water supply by using simple equipment and piping systems. A new type of hot water supply specification can be added by simply adding a hot water circulation pump, a regulating valve and an associated piping system. The complexity of the equipment and piping system is greatly reduced, which greatly reduces the investment in the factory and the floor space occupied by the equipment.

[0024] (2) The hot water supply circulation system of the present invention shares a complete set of heat utilization system, saving the investment in cooling facilities such as air coolers and heat exchangers; while supplying hot water of different grades, there is no mutual interference in the supply of hot water, and the hot water supply temperature remains stable;

[0025] (3) The present invention utilizes a regulating valve and a hot water circulation pump as the main method for cooling and mixing hot water, thereby avoiding the use of a heat exchanger. The cooling measures are timely and efficient, saving equipment investment.

[0026] (4) The heat utilization system of the present invention can fully utilize the large amount of heat generated by hot water users to continuously and stably produce cold water, greatly reducing heat waste and achieving efficient heat utilization;

[0027] (5) The present invention utilizes a flow regulating valve disposed on the pipeline connecting the cold water supply main pipe and the return water main pipe in the heat utilization system. A flow meter is disposed on the cold water supply main pipe. The cold water supply amount of the cold water main pipe is regulated by adjusting the opening of the flow regulating valve, thereby adjusting the utilization load of the entire system and improving the utilization efficiency of heat.

[0028] (6) The present invention utilizes a temperature regulating valve disposed on the connecting pipeline between the cold water inlet and outlet of the lithium bromide unit in the heat utilization system. The regulating valve can be used to adjust the amount of cold water entering the lithium bromide unit, thereby adjusting the operating load of the unit, and realizing timely and stable adjustment of the cold water supply.

[0029] (7) The present invention utilizes a thermometer disposed on the cold water outlet pipe of the air cooler in the heat utilization system, and adjusts the cold water outlet temperature of the air cooler by frequency conversion of the air cooler motor. The adjustment method is timely and effective, and can achieve energy saving to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of the multi-level hot water supply system of the present application;

[0031] Among them, Figure 1 The markings are as follows: 1-1: hot water circulation pump 1, 1-2: hot water circulation pump 2, 2-1: cold water circulation pump 1, 2-2: cold water circulation pump 2, 3: heater, 4: lithium bromide unit, 5: air cooler, 6: expansion tank, 7: first temperature regulating valve, 8: first temperature sensor, 9: second temperature regulating valve, 10: second temperature sensor, 11: air cooler frequency conversion motor, 12: fifth temperature sensor, 13: first flow regulating valve, 14: first flow meter, 15: third temperature regulating valve, 16: third temperature sensor, 17: first cut-off valve, 18: first safety valve, 19: fourth temperature regulating valve, 20: fourth temperature sensor, 21: second cut-off valve, 22: second safety valve, 23: third cut-off valve, 24: first liquid level sensor;

[0032] Figure 2 It is a structural diagram of a traditional multi-stage hot water supply system;

[0033] Among them, Figure 2 The markings are as follows: 1: hot water circulation pump, 2: heater, 3: air cooler, 4: expansion water tank, 5: air cooler frequency conversion motor, 6: first temperature control valve, 7: first temperature sensor, 8: second temperature sensor, 9: third temperature sensor, 10: first flow control valve, 11: first flow meter, 12: first cut-off valve, 13: first liquid level sensor. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more clear.

[0035] Example 1

[0036] like Figure 1 As shown, the hot water supply circulation system consists of two groups of hot water circulation pumps (1-1 or 1-2) whose inlets are connected to the cold water supply main through pipelines, and each group of hot water circulation pumps (1-1 or 1-2) whose outlet is connected to the corresponding user's hot water inlet through pipelines, and the user's hot water outlet is respectively connected to the hot water circulation pump inlet and the cold water return main through pipelines.

[0037] The heat utilization system is connected by a pipeline from the inlet of the cold water circulation pump (2-1 or 2-2) to the cold water return main pipe, the outlet of the cold water circulation pump (2-1 or 2-2) to the inlet of the heater 3 and the cold water inlet of the lithium bromide unit 4 respectively through pipelines, and the low-temperature water inlet and outlet of the lithium bromide unit 4 are respectively connected to the low-temperature water supply and return main pipe through pipelines; the outlet of the heater 3 is respectively connected to the cold water inlet and cold water outlet of the lithium bromide unit 4 through pipelines; the cold water outlet of the lithium bromide unit 4 is connected to the hot water inlet of the air cooler 5 through pipelines; the cold water outlet of the air cooler 5 is connected to the cold water supply main pipe; the cold water supply main pipe is respectively connected to the cold water return main pipe and the inlet pipes of each group of hot water circulation pumps (1-1 or 1-2) through pipelines. The cold water return main pipe is respectively connected to the expansion tank 6 and the hot water outlet of each hot water user through pipelines.

[0038] Further, the outlet temperature of each group of hot water circulation pumps (1-1 or 1-2) is monitored by a third or fourth temperature sensor (16 or 21), and the amount of cold water entering the inlet of the hot water circulation pump (1-1 or 1-2) from the cold water supply main pipe is adjusted by a third or fourth temperature regulating valve (15 or 19) respectively arranged on the connecting pipeline between the cold water supply main pipe and the pump (1-1 or 1-2) inlet, so as to control the temperature of the hot water mixed by the hot water circulation pump (1-1 or 1-2). A first or second shut-off valve (17 or 21) is arranged on the connecting pipeline between each user and the cold water return main pipe, and it is opened at the same time as the corresponding third or fourth temperature regulating valve (15 or 19) to prevent the outlet pipeline system of each group of hot water circulation pumps (1-1 or 1-2) from overpressure. A first or second safety valve (18 or 22) is respectively arranged on the outlet pipeline of each group of hot water circulation pumps (1-1 or 1-2) to protect the outlet pipeline and the equipment connected thereto.

[0039] A first flow regulating valve 13 is provided on the pipeline connecting the cold water supply main and the return water main, and a first flow meter 14 is provided on the cold water supply main. The cold water supply amount of the cold water supply main is adjusted by adjusting the opening of the first flow regulating valve 13, so as to adjust the usage load of the entire system.

[0040] The cold water circulation pump (2-1 or 2-2) adopts a variable frequency motor, which can flexibly change the frequency to adjust the cold water circulation volume according to the user's usage load, thereby reducing the energy consumption of the heat utilization system.

[0041] A fifth thermometer 12 is provided on the cold water outlet pipeline of the air cooler 5 to monitor the temperature of the cold water after cooling by the air cooler, and the cold water outlet temperature of the air cooler is adjusted by the motor frequency conversion.

[0042] A second temperature regulating valve 9 is provided on the connecting pipeline of the cold water inlet and outlet of the lithium bromide unit 4, and the regulating valve here can be used to adjust the amount of cold water entering the lithium bromide unit 4, thereby adjusting the operating load of the unit.

[0043] There are two hot water users, and the required hot water specifications and usage are as follows:

[0044] username Hot water supply temperature ℃ Hot water return temperature ℃ <![CDATA[Hot water consumption m 3 / h]]> User 1 105 110 120 User 2 90 95 200

[0045] The equipment list used is as follows:

[0046]

[0047] The cold water supply temperature is set at 70°C. When the operation starts, the heater (3) is used to heat the cold water. The heating source of the heater adopts 0.2MPa (G) steam. When the cold water temperature reaches 90°C, the heating is stopped and hot water is immediately supplied to the hot water users. The air cooler (5) is used to cool the cold water. When the hot water users are using it stably, the cold water is switched to enter the lithium bromide unit for cooling and heating.

[0048] Example 2

[0049] Using the equipment and piping system of the above-mentioned specific embodiment 1, the other operating parameters remain unchanged. On this basis, 5 new hot water users are added, and the required hot water specifications and usage are as follows:

[0050]

[0051]

[0052] According to the above process, only five hot water circulation pumps and the associated piping systems, regulating valves, thermometers, etc. need to be added, and the specifications of the cold water circulation pump, air cooler, heater and lithium bromide unit need to be adjusted. The equipment list used is as follows:

[0053] Serial number Device Name Models and specifications quantity 1 Hot water circulation pump (1-1) <![CDATA[Flow rate: 120 m 3 / h, head: 30 m]]> 1 2 Hot water circulation pump (1-2) <![CDATA[Flow rate: 200 m 3 / h, head: 30 m]]> 1 3 Hot water circulation pump (1-3) <![CDATA[Flow rate: 300 m 3 / h, head: 30 m]]> 1 4 Hot water circulation pump (1-4) <![CDATA[Flow rate: 150 m 3 / h, head: 30 m]]> 1 5 Hot water circulation pump (1-5) <![CDATA[Flow rate: 250 m 3 / h, head: 30 m]]> 1 6 Hot water circulation pump (1-6) <![CDATA[Flow rate 350m 3 / h, head 30m]]> 1 7 Hot water circulation pump (1-7) <![CDATA[Flow rate: 100 m 3 / h, head: 30 m]]> 1 8 Cold water circulation pump (2-1 and 2-2) <![CDATA[Flow rate: 230 m 3 / h, head: 30 m]]> 2 9 Heaters(3) <![CDATA[Plate heat exchanger, heat transfer area 80m 2 > 1 10 Lithium Bromide Unit(4) <![CDATA[Cooling capacity: 2910 kW, low-temperature water production at 15 - 10°C: 500 m 3 / h,]]> 1 11 Air Cooler(5) Heat load: 5040kW 1 12 Expansion tank (6) <![CDATA[Volume: 5m 3 > 1

[0054] The cold water supply temperature is set at 50°C. When the operation starts, the heater (3) is used to heat the cold water. The heating source of the heater adopts 0.2MPa (G) steam. When the cold water temperature reaches 55°C, the heating is stopped and hot water is immediately supplied to the hot water users. The air cooler (5) is used to cool the cold water. When the hot water users are using it stably, the cold water is switched to enter the lithium bromide unit for cooling and heating.

[0055] Comparative Example 1

[0056] In order to compare the characteristics of the technical solution of the present invention, a conventional hot water supply system is compared with the specific embodiment 2; the conventional hot water supply system is as shown in the attached Figure 2 As shown in the composition, the hot water return main pipe is connected to the outlet of the expansion water tank 4, the outlet of the hot water user, and the hot water supply main pipe through pipes, and the hot water return main pipe is connected to the inlet of the hot water circulation pump 1; the outlet of the hot water circulation pump 1 is connected to the inlet and outlet of the heater 2 through pipes respectively; the outlet of the heater 2 is connected to the inlet and outlet of the air cooler 3; the outlet of the air cooler 3 is connected to the hot water supply main pipe, and the hot water supply main pipe is connected to the inlet of the hot water user; each additional level of hot water requires an additional set of the above equipment. To supply various levels of hot water as described in the specific embodiment 2, the equipment list used is as follows:

[0057]

[0058]

[0059] Seven traditional hot water supply systems are required to correspond to the seven hot water levels, and each group must be equipped with an air cooler inverter 5, a first temperature regulating valve 6, a first temperature sensor 7, a second temperature sensor 8, a third temperature sensor 9, a first flow regulating valve 10, a first flow meter 11, a first shut-off valve 12, and a first liquid level meter 13. It can be seen that compared with the specific embodiment 2, the traditional hot water supply system has more equipment and a greatly increased complexity of the pipeline system, which increases the investment of the factory and the floor space of the equipment accordingly. In addition, the seven traditional hot water supply systems cannot be equipped with a lithium bromide unit for cooling each system, and the investment is too large. Moreover, the temperature of some hot water is lower than 75°C, which is lower than the minimum temperature requirement of the hot water type lithium bromide unit for hot water. The economic efficiency of heat utilization is low, and the heat of the hot water cannot be fully utilized.

[0060] The present invention provides a concept and method for a multi-level hot water supply system. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A multi-level hot water supply circulation system, characterized in that: It includes hot water supply circulation system and heat utilization system, including: The hot water supply circulation system comprises at least one group of hot water circulation pumps, each group of hot water circulation pumps corresponds to a group of users, the inlet of the hot water circulation pump is connected to the cold water supply main, the outlet of the hot water circulation pump is connected to the hot water inlet of the corresponding user, and the hot water outlet of the user is connected to the inlet of the hot water circulation pump and the cold water return main respectively; The heat utilization system includes a cold water circulation pump, a heater, a lithium bromide unit, an air cooler and an expansion tank, wherein the inlet of the cold water circulation pump is connected to the cold water return main pipe, and the outlet of the cold water circulation pump is respectively connected to the inlet of the heater and the cold water inlet of the lithium bromide unit; the outlet of the heater is respectively connected to the cold water inlet and the cold water outlet of the lithium bromide unit; the cold water outlet of the lithium bromide unit is connected to the cold water inlet of the air cooler, the low-temperature water outlet of the lithium bromide unit is connected to the low-temperature water supply main pipe through a pipeline, and the low-temperature water inlet of the lithium bromide unit is connected to the low-temperature water return main pipe through a pipeline; the cold water outlet of the air cooler is connected to the cold water supply main pipe; the hot water outlet of the expansion tank is connected to the cold water return main pipe.

2. The multi-stage hot water supply circulation system according to claim 1, characterized in that: A temperature regulating valve is provided on the connecting pipeline between the inlet of the hot water circulation pump and the cold water supply main; a shut-off valve is provided on the connecting pipeline between the hot water outlet of each group of users and the cold water return main, and the shut-off valve and the temperature regulating valve are opened simultaneously; a safety valve is provided on the outlet pipeline of each group of hot water circulation pumps.

3. The multi-stage hot water supply circulation system according to claim 1, characterized in that: The outlet temperature of the hot water circulation pump is independently set according to the user's usage requirements; the temperature level and quantity of the hot water at the outlet of the hot water circulation pump can be freely increased according to the user's requirements.

4. The multi-stage hot water supply system according to claim 1, characterized in that: A flow regulating valve is arranged on the pipeline connecting the cold water supply main pipe and the cold water return main pipe. A flow meter is arranged on the cold water supply main pipe. The flow meter is used to adjust the cold water supply amount of the cold water supply main pipe and thus adjust the usage load of the entire system.

5. The multi-stage hot water supply circulation system according to claim 1, characterized in that: The cold water circulation pump adopts a variable frequency motor.

6. The multi-stage hot water supply circulation system according to claim 1, characterized in that: A thermometer and an air cooler variable frequency motor are arranged on the cold water outlet pipeline of the air cooler, and the cold water outlet temperature of the air cooler is adjusted by the variable frequency motor of the air cooler.

7. The multi-stage hot water supply circulation system according to claim 1, characterized in that: A temperature regulating valve is installed on the connecting pipes between the cold water inlet and outlet of the lithium bromide unit.

8. A method for configuring a multi-level hot water supply circulation system according to any one of claims 1 to 7, characterized in that: The steps include: (1) Determine the flow and lift of the hot water circulation pump according to the specifications and usage requirements of the hot water users and the piping system between the hot water circulation pump and the user. Similarly, summarize the relevant information of the hot water users and finally determine the hot water usage load of all users, thereby determining the working load of the air cooler; (2) Determine the amount of cold water required by each hot water user based on the hot water temperature difference and flow rate of each hot water user. Similarly, summarize the relevant information of the hot water users and determine the supply and return water temperature and cold water circulation volume of the cold water circulation system. Determine the head of the cold water circulation pump based on the pressure drop of the cold water pipeline and equipment, and finally determine the rated load of the lithium bromide unit and the low-temperature water supply and return water flow and temperature difference of the lithium bromide unit; (3) In the heat utilization system, an expansion water tank is used to replenish water to the pipes and equipment space in the system; (4) In the heat utilization system, the flow rate of the heating source is adjusted by using a heater and a thermometer installed on the outlet pipe of the heater to heat the cold water in the system to a specified temperature; (5) In the heat utilization system, a flow control valve is installed on the pipeline connecting the cold water supply main and the return water main. A flow meter is installed on the cold water supply main. The cold water supply volume of the cold water main is adjusted by adjusting the opening of the flow control valve, thereby adjusting the usage load of the entire system; (6) In each group of hot water supply circulation system, the amount of cold water entering the hot water circulation pump inlet from the cold water supply main pipe can be adjusted by a temperature regulating valve installed on the connecting pipe between the cold water supply main pipe and the pump inlet, so as to control the temperature of the hot water after mixing through the hot water circulation pump; (7) In the heat utilization system, the temperature regulating valve installed on the connecting pipes of the cold water inlet and outlet of the lithium bromide unit can be used to adjust the amount of cold water entering the lithium bromide unit through the regulating valve here, thereby adjusting the operating load of the unit; (8) In the heat utilization system, a thermometer installed on the cold water outlet pipe of the air cooler is used to adjust the cold water outlet temperature of the air cooler through the frequency conversion of the air cooler motor.

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