A night-time air conditioning ice storage system

Abstract

The utility model relates to related technical field of air conditioner, specifically is a kind of for air conditioner ice storage night side storage side supply system, including side storage side supply module, the side storage side supply module includes: second glycol pump, the import of second glycol pump is connected respectively with the V1 pipeline and V2 pipeline connection of second electric regulating valve and third electric regulating valve, the import of V1 pipeline is connected ice tank, the import of V2 pipeline is connected the export of first plate heat exchanger;Second plate heat exchanger, with second glycol pump is connected;First temperature sensor and second temperature sensor, respectively set in the import and export of second plate heat exchanger, for detecting the temperature of mixed glycol solution and secondary side water supply temperature.Can not increase base chiller under the condition, ensure double working condition refrigeration host computer can still meet the supply air conditioner tail end small amount of cold load while storing cold, avoid additional increase base chiller.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, specifically a nighttime ice storage and supply system for air conditioning. Background Technology

[0002] Under the "dual carbon" goal, ice storage central air conditioning systems, through their "peak shaving and valley filling" operation mechanism (utilizing off-peak electricity prices at night to produce ice for storage and releasing cooling capacity during the day), significantly reduce peak grid load and fossil fuel consumption, becoming a key technology for low-carbon transformation in the building sector. Its necessity is reflected in two aspects: first, air conditioning energy consumption accounts for 30%-50% of total building energy consumption; this system can improve energy efficiency, reduce carbon emissions, and help achieve carbon peaking; second, through peak-valley electricity pricing policies (such as a 5-fold price difference in Beijing and nearly 7 times in Shenzhen), it reduces user operating costs and alleviates the peak-valley supply-demand imbalance in the power grid. Currently, this technology has been included in the national key promotion catalog for energy conservation and emission reduction, and its application rate in large public buildings continues to rise, becoming a typical solution for balancing energy transition and economic benefits.

[0003] There are various forms of ice storage cooling. In residential single-building systems, the most common form of ice storage central air conditioning system is "upstream series ice storage." This system is designed with the main unit located upstream of the ethylene glycol cycle. It increases the COP (Coefficient of Performance) of the chiller unit through a high return liquid temperature (close to conventional air conditioning operating conditions), while simultaneously utilizing the low-temperature physical characteristics (near-0°C ice-water mixture) of the downstream ice storage device to achieve large temperature difference cooling (supply and return water temperature difference of 6-8°C). Please refer to [link / reference]. Figure 1 The main equipment of the system includes: a dual-condition refrigeration unit 1, a base-loaded chiller unit 2, an ethylene glycol pump 3, a plate heat exchanger 4, an ice storage tank 5, a chilled water pump 6, an air conditioning terminal 7, an electric regulating valve and corresponding pipelines and valves.

[0004] The dual-mode chiller unit of the ice storage system is in ice storage mode at night (23:00 to 7:00 the next day), and can have multiple operating states during the day (7:00 to 23:00) depending on the air conditioning load, such as: on in combined cooling mode and off in ice tank-only cooling mode. When there is no air conditioning load at night, the base load chiller unit does not need to be installed; when the night load is large enough, according to Article 3.3.2 of "Technical Standard for Energy Storage Air Conditioning Engineering" JGJ158-2018 and Article 8.7.4 of "Code for Design of Heating, Ventilation and Air Conditioning of Civil Buildings" GB50736-2012, the base load chiller unit needs to be installed when the following conditions are met.

[0005] However, if there is nighttime load, but the conditions for setting up a base-load chiller unit are not met, and the load is unstable, sometimes running and sometimes not, then setting up a separate base-load chiller unit that meets the load requirements would require a larger machine room. This would increase the initial investment, making it less economical, and the equipment might also remain idle, resulting in waste. Utility Model Content

[0006] The purpose of this invention is to provide a nighttime ice storage and supply system for air conditioning, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a nighttime ice storage and supply system for air conditioning, comprising: at least one dual-mode refrigeration unit; multiple ice storage tanks connected to the dual-mode refrigeration unit; multiple first ethylene glycol pumps connected to the dual-mode refrigeration unit and the ice storage tanks; two sets of chilled water pumps, both connected to the air conditioning unit's tail end, one set of chilled water pumps connected to a base-loaded chiller unit, and the other set of chilled water pumps connected to a first plate heat exchanger; further comprising an ice storage and supply module, the ice storage and supply module comprising: a second ethylene glycol pump, the inlet of the second ethylene glycol pump being connected to V1 and V2 pipelines respectively equipped with a second electric regulating valve and a third electric regulating valve, the inlet of the V1 pipeline being connected to the ice storage tank, and the inlet of the V2 pipeline being connected to the outlet of the first plate heat exchanger; a second plate heat exchanger connected to the second ethylene glycol pump; a first temperature sensor and a second temperature sensor respectively installed at the inlet and outlet of the second plate heat exchanger for detecting the temperature of the mixed ethylene glycol solution and the secondary side supply water temperature.

[0008] As described above, the nighttime ice storage and supply system for air conditioning uses the following: the second ethylene glycol pump is a variable frequency pump, and the frequency of the second ethylene glycol pump is interlocked and adjusted by the secondary side water supply temperature detected by the temperature sensor.

[0009] As described above, the nighttime ice storage and supply system for air conditioning uses the following: the opening degree of the second and third electric regulating valves is dynamically adjusted based on the temperature of the mixed ethylene glycol solution detected by the temperature sensor.

[0010] As described above, the nighttime ice storage and supply system for air conditioning ice storage includes: the liquid outlets of the two dual-condition refrigeration units are connected to pipelines, which are divided into pipeline A and pipeline B. Pipeline A is connected to the ice storage tank, and pipeline B is connected to the liquid inlet of the first ethylene glycol pump and the second electric regulating valve. Both pipeline A and pipeline B are equipped with a first solenoid valve.

[0011] The nighttime ice storage and supply system for air conditioning, as described above, consists of the first plate heat exchanger and the second plate heat exchanger connected in parallel.

[0012] As described above, the nighttime ice storage and supply system for air conditioning uses ice storage: the inlet of the primary side of the plate heat exchanger is connected to the outlet of the dual-condition refrigeration unit, the outlet of the primary side is connected to the inlet of the dual-condition refrigeration unit, the inlet of the secondary side is connected to the outlet of the air conditioner tail end, and the outlet of the secondary side is connected to the inlet of the chilled water pump.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: After the high and low temperature solutions are mixed through the second and third electric regulating valves, they pass through the second plate heat exchanger and the first plate heat exchanger. The temperature of the mixed solution must be higher than 0°C to ensure that the secondary side chilled water will not freeze in the second and first plate heat exchangers when exchanging heat. Through the setting of the second electric regulating valve, the third electric regulating valve, the second plate heat exchanger and the second ethylene glycol pump, it is possible to ensure that the dual-condition refrigeration unit can still meet the supply of a small amount of cooling load to the air conditioning terminal while storing cold without adding a base load chiller unit. This avoids the need for an additional base load chiller unit, saves initial investment and machine room floor space, and maximizes the system's adaptability to low cooling load at night. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an existing air conditioning ice storage system;

[0015] Figure 2 This is a schematic diagram of a nighttime ice storage and supply system used for air conditioning.

[0016] In the diagram: 1-Dual-condition refrigeration unit, 2-Base-load chiller unit, 3-First ethylene glycol pump, 3.1-Second ethylene glycol pump, 4-First plate heat exchanger, 4.1-Second plate heat exchanger, 5-Water storage tank, 6-Chiller water pump, 7-Air conditioning terminal, 8-First electric regulating valve, 8.1-Second electric regulating valve, 8.2-Third electric regulating valve, T1-First temperature sensor, T2-Second temperature sensor. Detailed Implementation

[0017] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0018] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0019] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0020] Please see Figure 1 In this embodiment of the present invention, a nighttime ice storage and supply system for air conditioning includes: at least one dual-mode refrigeration unit 1; multiple ice storage tanks 5 connected to the dual-mode refrigeration unit 1; multiple first ethylene glycol pumps 3 connected to the dual-mode refrigeration unit 1 and the ice storage tanks 5; two sets of chilled water pumps 6, both connected to the air conditioning terminal 7, one set of chilled water pumps 6 connected to a base-loaded chiller unit 2, and the other set of chilled water pumps 6 connected to a first plate heat exchanger 4; and a simultaneous storage and supply module, the storage and supply module including: a second ethylene glycol pump 3.1, wherein... The inlet of the second ethylene glycol pump 3.1 is connected to the V1 and V2 pipes of the second electric regulating valve 8.1 and the third electric regulating valve 8.2, respectively. The inlet of the V1 pipe is connected to the ice storage tank 5, and the inlet of the V2 pipe is connected to the outlet of the first plate heat exchanger 4. The second plate heat exchanger 4.1 is connected to the second ethylene glycol pump 3.1. The first temperature sensor T1 and the second temperature sensor T2 are respectively installed at the inlet and outlet of the second plate heat exchanger 4.1 to detect the temperature of the mixed ethylene glycol solution and the secondary side water supply temperature.

[0021] The second ethylene glycol pump 3.1 is a variable frequency pump, and its frequency is adjusted in a chain according to the secondary side water supply temperature detected by the temperature sensor T2.

[0022] The second temperature sensor T2 detects the secondary side supply water temperature of the second plate heat exchanger 4.1 to ensure that the secondary side cooling temperature of the second plate heat exchanger 4.1 is at the design value. At the same time, it interlocks and adjusts the frequency of the second ethylene glycol pump 3.1. The second ethylene glycol pump 3.1 operates by frequency conversion to regulate the flow rate of ethylene glycol entering the primary side of the first plate heat exchanger 4 and the second plate heat exchanger 4.1. The second ethylene glycol pump 3.1 draws liquid from pipelines V1 and V2. Pipeline V1 contains low-temperature ethylene glycol solution from the ice tank outlet, and pipeline V2 contains high-temperature ethylene glycol solution after heat exchange in the second plate heat exchanger 4.1. The first temperature sensor T1 adjusts the opening of the second electric regulating valve 8.1 and the third electric regulating valve 8.2 by detecting the temperature of the mixed ethylene glycol solution (the flow rates of the two mixing branches are determined proportionally by a certain algorithm (see the example below)) to ensure that the mixed water reaches the required set temperature.

[0023] After the high and low temperature solutions are mixed through the second electric regulating valve 8.1 and the third electric regulating valve 8.2, they pass through the second plate heat exchanger 4.1 and the first plate heat exchanger 4. The temperature of the mixed solution must be higher than 0℃ to ensure that the secondary side chilled water will not freeze inside the second plate heat exchanger 4.1 and the first plate heat exchanger 4 during heat exchange. Through the setting of the second electric regulating valve 8.1, the third electric regulating valve 8.2, the second plate heat exchanger 4.1 and the second ethylene glycol pump 3.1, it is possible to ensure that the dual-condition refrigeration unit 1 can still meet the small amount of cooling load supplied to the air conditioning terminal 7 while storing cold without adding a base load chiller unit 2. This avoids the need for an additional base load chiller unit 2, saves initial investment and machine room floor space, and maximizes the system's adaptability to low cooling load at night.

[0024] Example: Taking a certain cold storage system with a nighttime load of 150RT (527kW) as an example, which does not meet the conditions for setting up a base load chiller unit 2, a nighttime simultaneous storage and supply mode is adopted to solve the nighttime cooling problem. The inlet and outlet temperatures of the ethylene glycol side of the second plate heat exchanger 4.1 are set to 3.5℃ and 10.5℃, respectively, with a heat exchange temperature difference Δt=7℃. The outlet ethylene glycol temperature of the ice storage tank 5 is -2.9℃. The flow rate through the second electric regulating valve 8.1 is set to V1, and the flow rate through the third electric regulating valve 8.2 is set to V2. The flow rates through the second electric regulating valve 8.1 and the third electric regulating valve 8.2 can be calculated as follows.

[0025] The flow rate of the second ethylene glycol pump is calculated as follows: 3.1 Flow rate = 150 × 3.516 × 3.6 × 1.08 / (4.18 × 7) = 70 m³ 3 / h

[0026] Conservation of mass: V1 + V2 = 70 (1)

[0027] Energy conservation -2.9V1 + 10.5V2 = 3.5 × (V1 + V2) (2)

[0028] Solving equations (1) and (2) simultaneously, we get V1 = 36.5 and V2 = 33.5.

[0029] That is, the flow rate through the second electric regulating valve 8.1 is 36.5m³. 3 / h, the flow rate through the third electric regulating valve 8.2 is 33.5m³ / h. 3 / h.

[0030] Furthermore, the opening degree of the second electric regulating valve 8.1 and the third electric regulating valve 8.2 is dynamically adjusted by the temperature of the mixed ethylene glycol solution detected by the temperature sensor T1.

[0031] When the temperature sensor T1 detects that the temperature of the mixed ethylene glycol solution is higher or lower than the set value, the control system will automatically adjust the opening of the second electric regulating valve 8.1 and the third electric regulating valve 8.2 to accurately control the mixing ratio of the high and low temperature solutions, thereby ensuring that the temperature of the mixed solution is maintained within the preset range. This dynamic adjustment mechanism not only improves the automation level of the system, but also effectively enhances the stability and reliability of the system.

[0032] The liquid outlets of the two dual-mode refrigeration units 1 are connected to pipelines, which are divided into pipeline A and pipeline B. Pipeline A connects to the ice storage tank 5, and pipeline B connects to the liquid inlet of the first ethylene glycol pump 3 and the second electric regulating valve 8.1. Both pipeline A and pipeline B are equipped with a first solenoid valve 8. By controlling the on / off state of the first solenoid valve 8, the output flow direction of the dual-mode refrigeration unit 1 can be flexibly switched, realizing the free conversion between refrigeration and ice storage modes. When the system is in ice storage mode, the first solenoid valve 8 of pipeline A is open, and the first solenoid valve 8 of pipeline B is closed. The low-temperature ethylene glycol solution produced by the dual-mode refrigeration unit 1 flows into the ice storage tank 5 through pipeline A for cold storage. When the system needs to provide cooling load to the air conditioning terminal 7, the first solenoid valve 8 of pipeline B is open, and the first solenoid valve 8 of pipeline A is closed to achieve a suitable supply temperature.

[0033] The first plate heat exchanger 4 and the second plate heat exchanger 4.1 are connected in parallel. With the parallel configuration of the first plate heat exchanger 4 and the second plate heat exchanger 4.1, the system can flexibly allocate the flow rate of ethylene glycol solution according to actual needs. When the cooling load demand of the air conditioning terminal 7 is low, heat exchange can be carried out only through the first plate heat exchanger 4, reducing energy consumption.

[0034] The plate heat exchanger 4 has its primary side inlet connected to the outlet of the dual-condition refrigeration unit 1, and its primary side outlet connected to the inlet of the dual-condition refrigeration unit 1. Its secondary side inlet is connected to the outlet of the air conditioner tail end 7, and its secondary side outlet is connected to the inlet of the chilled water pump 6. This connection method ensures effective circulation of the ethylene glycol solution within the plate heat exchanger 4. On the primary side, the ethylene glycol solution flows out from the outlet of the dual-condition refrigeration unit 1, undergoes heat exchange in the plate heat exchanger 4, and then returns to the inlet of the dual-condition refrigeration unit 1, forming a closed loop. On the secondary side, the ethylene glycol solution receives heat from the outlet of the air conditioner tail end 7, undergoes heat exchange in the secondary side of the plate heat exchanger 4, transferring the heat to the ethylene glycol solution on the primary side. The cooled ethylene glycol solution then enters the chilled water circulation system through the inlet of the chilled water pump 6, providing continuous cooling for the air conditioning system.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A nighttime ice storage and supply system for air conditioning, comprising: At least one dual-condition refrigeration unit (1); multiple ice storage tanks (5) connected to the dual-condition refrigeration unit (1); Multiple first ethylene glycol pumps (3) are connected to the dual-condition refrigeration unit (1) and the ice storage tank (5); two sets of chilled water pumps (6) are connected to the air conditioning tail end (7), one set of chilled water pumps (6) is connected to the base-loaded chiller unit (2), and the other set of chilled water pumps (6) is connected to the first plate heat exchanger (4); characterized in that it also includes a simultaneous storage and supply module, the simultaneous storage and supply module including: a second ethylene glycol pump (3.1), the inlet of the second ethylene glycol pump (3.1) is respectively provided with a second electric regulating valve (8) .1) and the V1 and V2 pipes of the third electric regulating valve (8.2) are connected. The inlet of the V1 pipe is connected to the ice storage tank (5), and the inlet of the V2 pipe is connected to the outlet of the first plate heat exchanger (4). The second plate heat exchanger (4.1) is connected to the second ethylene glycol pump (3.1). The first temperature sensor (T1) and the second temperature sensor (T2) are respectively installed at the inlet and outlet of the second plate heat exchanger (4.1) to detect the temperature of the mixed ethylene glycol solution and the secondary side water supply temperature.

2. A nighttime ice storage and supply system for air conditioning according to claim 1, characterized in that, The second ethylene glycol pump (3.1) is a variable frequency pump, and the frequency of the second ethylene glycol pump (3.1) is interlocked and adjusted by the secondary side water supply temperature detected by the temperature sensor (T2).

3. A nighttime ice storage and supply system for air conditioning according to claim 1, characterized in that, The opening degree of the second electric regulating valve (8.1) and the third electric regulating valve (8.2) is dynamically adjusted by the temperature of the mixed ethylene glycol solution detected by the temperature sensor (T1).

4. A nighttime ice storage and supply system for air conditioning according to claim 1, characterized in that, The liquid outlets of the two dual-condition refrigeration units (1) are connected to pipelines, which are divided into pipeline A and pipeline B. Pipeline A is connected to the ice storage tank (5), and pipeline B is connected to the liquid inlet of the first ethylene glycol pump (3) and the second electric regulating valve (8.1). Both pipeline A and pipeline B are equipped with a first solenoid valve (8).

5. A nighttime ice storage and supply system for air conditioning according to claim 1, characterized in that, The first plate heat exchanger (4) and the second plate heat exchanger (4.1) are connected in parallel.

6. A nighttime ice storage and supply system for air conditioning according to claim 1, characterized in that, The plate heat exchanger (4) has its primary side inlet connected to the outlet of the dual-condition refrigeration unit (1), its primary side outlet connected to the inlet of the dual-condition refrigeration unit (1), its secondary side inlet connected to the outlet of the air conditioning tail end (7), and its secondary side outlet connected to the inlet of the chilled water pump (6).

Images