Chilled water system

Abstract

The present disclosure relates to a chilled water system, comprising: a chiller unit comprising a freezing side and a cooling side, the freezing side being configured to provide chilled water to a user side; a cooling tower connected to the cooling side of the chiller unit; and a water storage container connected to the cooling side of the chiller unit, the water storage container being configured to contain natural water; wherein at least one of the cooling tower and the water storage container is configured to operatively provide cooling capacity to the cooling side of the chiller unit. The chiller unit is cooled by the cooling capacity of the lower temperature natural water in the water storage container, and the mechanical ventilation cooling of the cooling tower is used to take away the heat emitted by the condenser in the chiller unit, thereby reducing the selection capacity of the cooling tower, reducing the initial investment of the equipment, and improving the operation stability of the chilled water system by using multiple cooling sources for joint cooling.

Description

Technical Field

[0001] This disclosure relates to the field of refrigeration technology, and more particularly to an ice-water system. Background Technology

[0002] Dairy production parks have simultaneous energy needs for cooling, heating, and water, and these needs are relatively independent. For example, some production water is natural water that has undergone water treatment before being used in production. The process only has high requirements for water quality, not temperature. However, the cooling capacity of the relatively low-temperature natural water is not fully utilized, resulting in resource waste. Summary of the Invention

[0003] Some embodiments of this disclosure propose an ice-water system to alleviate the problem of underutilization of the coldness in natural water.

[0004] In one aspect of this disclosure, an ice-water system is provided, comprising:

[0005] A chiller unit includes a chilling side and a cooling side, wherein the chilling side is configured to supply chilled water to the user side;

[0006] A cooling tower, connected to the cooling side of the chiller unit; and

[0007] A water storage container is connected to the cooling side of the chiller unit, and the water storage container is configured to hold natural water;

[0008] The cooling tower and the water storage container are configured such that at least one of them can operatively provide cooling capacity to the cooling side of the chiller unit.

[0009] In some embodiments, the chilled water system further includes a heat exchanger connected to the cooling side of the water storage container and the chiller unit, the heat exchanger being configured to perform heat exchange between the water storage container and the chiller unit.

[0010] In some embodiments, the chilled water system further includes a first temperature sensing element disposed at the inlet on the cooling side of the chiller unit; wherein the cooling tower is configured such that T1 > T min It turns on when +ΔT1 to provide cooling capacity to the cooling side of the chiller unit, where T1 is the temperature value detected by the first temperature sensing element; T min ΔT1 is the lower limit value for the cooling return water temperature protection of the chiller unit; ΔT1 is the starting temperature deviation value of the cooling tower fan.

[0011] In some embodiments, the cooling tower is configured such that when T1 ≤ T min +ΔT1, and T1>T min It is shut off at any time to stop supplying cooling capacity to the cooling side of the chiller unit.

[0012] In some embodiments, the chilled water system further includes a first temperature sensing element disposed at the inlet on the cooling side of the chiller unit; wherein the cooling tower and the water storage container are configured such that T1 ≤ T min At any time, the supply of cooling capacity to the cooling side of the chiller unit is stopped; where T1 is the temperature value detected by the first temperature detection element; T min This is the lower limit value for the cooling return water temperature protection of the chiller unit.

[0013] In some embodiments, the chilled water system further includes a first operating mode in which the cooling tower is configured to operably provide cooling capacity to the cooling side of the chiller unit.

[0014] In some embodiments, the chilled water system further includes:

[0015] The first temperature sensing element is located at the inlet on the cooling side of the chiller unit;

[0016] A second temperature sensing element is disposed in the water storage container;

[0017] A third temperature sensing element is located near the cooling tower and is used to detect the ambient temperature near the cooling tower.

[0018] The fourth temperature detection element is located on the pipe connecting the outlet of the chiller unit on the cooling side to the cooling tower;

[0019] The chilled water system operates in its first mode when the following conditions are met:

[0020] T1>T min ;

[0021] T2+ΔT2≥T3+ΔT3; and

[0022] T4≤T1+ΔT4;

[0023] Where T1 is the detected temperature value of the first temperature sensing element;

[0024] T min This is the lower limit value for the protection of the cooling return water temperature of the chiller unit.

[0025] T2 is the temperature value detected by the second temperature sensing element;

[0026] ΔT2 is the temperature difference setpoint of the heat exchanger;

[0027] T3 is the temperature value detected by the third temperature sensing element;

[0028] ΔT3 is the approximation setting value for the cooling tower;

[0029] T4 is the temperature value detected by the fourth temperature sensing element;

[0030] ΔT4 is the absolute value set for the temperature difference between the inlet and outlet cooling water of the chiller unit.

[0031] In some embodiments, the cooling tower is configured such that when T1 > T min It is activated at +ΔT1.

[0032] In some embodiments, the cooling tower is configured such that when T1 ≤ T min +ΔT1, and T1>T min Close when needed.

[0033] In some embodiments, the chilled water system further includes a second operating mode in which the water storage container is configured to operably provide cooling capacity to the cooling side of the chiller unit.

[0034] In some embodiments, the chilled water system further includes:

[0035] The first temperature sensing element is located at the inlet on the cooling side of the chiller unit;

[0036] A second temperature sensing element is disposed in the water storage container;

[0037] A third temperature sensing element is located near the cooling tower and is used to detect the ambient temperature near the cooling tower.

[0038] The chilled water system operates in the second mode when the following conditions are met:

[0039] T1>T min ;as well as

[0040] T2 + ΔT2 < T3 + ΔT3;

[0041] Where T1 is the detected temperature value of the first temperature sensing element;

[0042] T min This is the lower limit value for the protection of the cooling return water temperature of the chiller unit.

[0043] T2 is the temperature value detected by the second temperature sensing element;

[0044] ΔT2 is the temperature difference setpoint of the heat exchanger;

[0045] T3 is the temperature value detected by the third temperature sensing element;

[0046] ΔT3 is the approximation setting value for the cooling tower.

[0047] In some embodiments, the chilled water system further includes a third operating mode in which both the cooling tower and the water storage container are configured to operably provide cooling capacity to the cooling side of the chiller unit.

[0048] In some embodiments, the chilled water system further includes:

[0049] The first temperature sensing element is located at the inlet on the cooling side of the chiller unit;

[0050] A second temperature sensing element is disposed in the water storage container;

[0051] A third temperature sensing element is located near the cooling tower and is used to detect the ambient temperature near the cooling tower.

[0052] The fourth temperature detection element is located on the pipe connecting the outlet of the chiller unit on the cooling side to the cooling tower;

[0053] The chilled water system operates in the third mode when the following conditions are met:

[0054] T1>T min ;

[0055] T2+ΔT2≥T3+ΔT3;

[0056] T4 > T1 + ΔT4; and

[0057] T4 > T2 + ΔT2;

[0058] Where T1 is the detected temperature value of the first temperature sensing element;

[0059] T min This is the lower limit value for the protection of the cooling return water temperature of the chiller unit.

[0060] T2 is the temperature value detected by the second temperature sensing element;

[0061] ΔT2 is the temperature difference setpoint of the heat exchanger;

[0062] T3 is the temperature value detected by the third temperature sensing element;

[0063] ΔT3 is the approximation setting value for the cooling tower;

[0064] T4 is the temperature value detected by the fourth temperature sensing element;

[0065] ΔT4 is the absolute value set for the temperature difference between the inlet and outlet cooling water of the chiller unit.

[0066] In some embodiments, the cooling tower is configured such that when T1 > T min It is activated at +ΔT1.

[0067] In some embodiments, the cooling tower is configured such that when T1 ≤ T min +ΔT1, and T1>T min Close when needed.

[0068] Based on the above technical solution, this disclosure has at least the following beneficial effects:

[0069] In some embodiments, the chilled water system provides cooling capacity to the cooling side of the chiller unit by setting up a water storage container and a cooling tower, at least one of which is operatively provided with cooling capacity to the cooling side of the chiller unit. The chiller unit is cooled by utilizing the cooling capacity of the lower-temperature natural water in the water storage container, and the mechanical ventilation of the cooling tower is used for cooling, which removes the heat dissipated by the condenser in the chiller unit. This reduces the required capacity of the cooling tower and the initial investment in the equipment. At the same time, the combined cooling from multiple cooling sources improves the operational stability of the chilled water system. Attached Figure Description

[0070] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings:

[0071] Figure 1 This is a schematic diagram of an ice-water system provided according to some embodiments of the present disclosure.

[0072] The labels in the attached diagram are explained as follows:

[0073] 1-Chiller unit;

[0074] 2-Cooling tower; 21-Fan;

[0075] 3-Water storage container;

[0076] 4-Heat exchanger;

[0077] 51-First temperature sensing element; 52-Second temperature sensing element; 53-Third temperature sensing element; 54-Fourth temperature sensing element;

[0078] 61-Water supply tank; 62-Water return tank;

[0079] 7-User side;

[0080] 81 - First pump; 82 - Second pump; 83 - Third pump; 84 - Fourth pump;

[0081] 91-First valve; 92-Second valve; 93-Third valve; 94-Fourth valve; 95-Fifth valve; 96-Sixth valve; 97-Seventh valve.

[0082] It should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Furthermore, the same or similar reference numerals denote the same or similar components. Detailed Implementation

[0083] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0084] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0085] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0086] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0087] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0088] Figure 1 This is a schematic diagram of the structure of some embodiments of the chilled water system according to the present disclosure.

[0089] refer to Figure 1 In some embodiments, the chilled water system includes a chiller unit 1. The chiller unit 1 includes a chilling side and a cooling side, the chilling side being configured to supply chilled water to the user side.

[0090] In some embodiments, the chilled water system further includes a cooling tower 2 connected to the cooling side of the chiller unit 1.

[0091] In some embodiments, the chilled water system also includes a water storage container 3, which is connected to the cooling side of the chiller unit 1 and in parallel with the cooling tower 2. The water storage container 3 is configured to contain natural water.

[0092] The cooling tower 2 and the water storage container 3 are configured such that at least one of them can operatively provide cooling capacity to the cooling side of the chiller unit 1.

[0093] The chilled water system provided in this embodiment provides cooling capacity to the chiller unit 1 by setting up a water storage container 3 and a cooling tower 2. At least one of the cooling tower 2 and the water storage container 3 can operatively provide cooling capacity to the cooling side of the chiller unit 1. The chiller unit 1 is cooled by the lower temperature natural water in the water storage container 3 and by the mechanical ventilation cooling of the cooling tower 2, which removes the heat emitted by the condenser in the chiller unit 1. This reduces the required capacity of the cooling tower 2 and the initial investment in the equipment. At the same time, the combined cooling of multiple cooling sources improves the operational stability of the chilled water system.

[0094] In some embodiments, the chiller unit 1 includes a refrigeration system consisting of a compressor, a condenser, a throttling device, and an evaporator.

[0095] The chilled side of chiller unit 1 is used to supply chilled water produced by the refrigeration system to user side 7. The chilled water supplied by the chilled side of chiller unit 1 to user side 7 is returned to chiller unit 1 after heat exchange at user side 7.

[0096] The cooling side of chiller unit 1 refers to the heat exchange between the cooling water prepared by the cooling capacity provided by cooling tower 2 and / or water storage container 3 and the heat released by the condenser, thereby reducing the refrigerant temperature of the refrigeration system within chiller unit 1. The cooling water flowing out from the cooling side of chiller unit 1, after exchanging heat with the cooling capacity provided by cooling tower 2 and / or water storage container 3, returns to the cooling side of chiller unit 1. The cooling water returning to the cooling side of chiller unit 1 is called cooling return water.

[0097] In some embodiments, the cooling tower 2 includes a fan 21.

[0098] In some embodiments, the water storage container 3 includes a water tank or water reservoir, etc. The water injected into the water storage container 3 is natural water.

[0099] Lower-temperature natural water can be combined with the ice water system in dairy production processes. The cooling capacity of the natural water can be used for cooling on the cooling side of the ice water system. This reduces the waste of cooling capacity, improves the operating efficiency of the ice water system, and also reduces the initial investment in mechanical ventilation cooling towers. Through comprehensive energy utilization, the energy systems of each stage of dairy production are closely linked, ensuring full utilization of resources and stable and efficient operation between systems.

[0100] In some embodiments, the chilled water system further includes a heat exchanger 4, which is connected to the cooling side of the water storage container 3 and the chiller unit 1, and is configured to achieve heat exchange between the water storage container 3 and the chiller unit 1.

[0101] Since the natural water in the water storage container 3 can be used for other production processes, in order to prevent the water in the water storage container 3 from being contaminated by direct heat exchange with the chiller unit 1, a heat exchanger 4 is installed between the water storage container 3 and the cooling side of the chiller unit 1. The water storage container 3 provides cooling capacity to the cooling side of the chiller unit 1 through the heat exchanger 4, which can prevent the natural water in the water storage container 3 from being contaminated.

[0102] In some embodiments, heat exchanger 4 includes a plate heat exchanger.

[0103] In some embodiments, the chilled water system further includes a first temperature sensing element 51, which is disposed at the inlet on the cooling side of the chiller unit 1. The first temperature sensing element 51 is used to detect the cooling return water temperature on the cooling side of the chiller unit 1.

[0104] Cooling tower 2 is configured such that when T1 > T min It is activated at +ΔT1 to provide cooling capacity to the cooling side of chiller unit 1.

[0105] Wherein, T1 is the detected temperature value of the first temperature sensing element 51;

[0106] T min This is the lower limit value for the cooling return water temperature protection of chiller unit 1;

[0107] ΔT1 is the starting temperature deviation value of the cooling tower fan.

[0108] The first temperature sensing element 51 is used to detect the water temperature inside the inlet of the cooling side of the chiller unit 1, that is, to detect the cooling return water temperature of the cooling side of the chiller unit 1.

[0109] T min This is the lower limit for the cooling return water temperature protection of chiller unit 1. Set T... min This is mainly to prevent the cooling return water temperature on the cooling side of chiller unit 1 from being too low, causing chiller unit 1 to trigger low temperature protection and fail to operate normally; that is, when the cooling return water temperature of chiller unit 1 is lower than T... minAt that time, chiller unit 1 cannot operate normally. Therefore, T1 > T min This is a necessary condition for the normal start-up of chiller unit 1.

[0110] ΔT1 represents the starting temperature deviation value of the cooling tower fan. Setting ΔT1 is primarily used to determine whether the cooling tower fan needs to be started. If the cooling return water temperature on the cooling side of chiller unit 1 is low and close to the outdoor air wet-bulb temperature, there is no need to start the cooling tower fan to enhance heat exchange. Therefore, setting ΔT1 can prevent frequent start-ups and shutdowns of cooling tower 2.

[0111] T1>T min +ΔT1 indicates that the cooling return water temperature on the cooling side of chiller unit 1 is relatively high. In order to reduce the return water temperature and improve the operating efficiency of chiller unit 1, the cooling tower fan needs to be turned on to enhance the heat exchange between the cooling water and the outdoor atmosphere, so as to make the cooling return water temperature as close as possible to the wet-bulb temperature of the outdoor atmosphere.

[0112] In some embodiments, cooling tower 2 is configured such that when T1 ≤ T min +ΔT1, and T1>T min When shut off, stop supplying cooling capacity to the cooling side of chiller unit 1.

[0113] First, we need to ensure the normal operation and startup of chiller unit 1, so T1 > T. min When T1≤T min When +ΔT1, it indicates that the cooling return water temperature on the cooling side of chiller unit 1 is low, and there is no need to turn on the cooling tower fan to enhance heat exchange.

[0114] In some embodiments, T min The value range is 15℃~18℃, with 15℃ being preferred.

[0115] In some embodiments, the value of ΔT1 ranges from 2℃ to 4℃, preferably 3℃.

[0116] In some embodiments, the chilled water system further includes a first temperature detection element 51, which is disposed at the inlet of the cooling side of the chiller unit 1 and is used to detect the cooling return water temperature of the cooling side of the chiller unit 1.

[0117] Among them, cooling tower 2 and water storage container 3 are configured such that when T1≤T min At that time, the supply of cooling capacity to the cooling side of chiller unit 1 will be stopped.

[0118] Wherein, T1 is the detected temperature value of the first temperature sensing element 51;

[0119] T min This is the lower limit value for the cooling return water temperature protection of chiller unit 1.

[0120] T1≤Tmin This indicates that the cooling water return temperature on the cooling side of chiller unit 1 is extremely low. To ensure the normal operation of chiller unit 1, the cooling water on the cooling side of chiller unit 1 needs to operate in internal circulation mode, raising the cooling water return temperature through natural heat exchange. When the outdoor temperature is extremely low, the internal circulation is bypassed through the cooling side pipeline of chiller unit 1 to ensure the normal operation of the chilled water system.

[0121] In some embodiments, the chilled water system further includes a first temperature sensing element 51. The first temperature sensing element 51 is disposed at the inlet of the cooling side of the chiller unit 1 and is used to detect the cooling return water temperature of the cooling side of the chiller unit 1.

[0122] Optionally, the first temperature sensing element 51 includes a temperature sensor.

[0123] In some embodiments, the chilled water system further includes a second temperature sensing element 52. The second temperature sensing element 52 is disposed in the water storage container 3 and is used to detect the temperature of the natural water in the water storage container 3.

[0124] Optionally, the second temperature sensing element 52 includes a temperature sensor.

[0125] In some embodiments, the chilled water system further includes a third temperature sensing element 53. The third temperature sensing element 53 is located near the cooling tower 2 and is used to detect the ambient temperature near the cooling tower 2.

[0126] Optionally, the third temperature sensing element 53 includes a temperature and humidity sensor. The third temperature sensing element 53 is used to detect the wet-bulb temperature of the environment near the cooling tower 2.

[0127] In some embodiments, the chilled water system further includes a fourth temperature detection element 54, which is located on the pipeline connecting the outlet of the chiller unit 1 on the cooling side to the cooling tower 2, and is used to detect the water temperature of the cooling water entering the cooling tower 2 from the cooling side of the chiller unit 1, i.e., the cooling water supply temperature T4 of the cooling tower 2.

[0128] Optionally, the fourth temperature sensing element 54 includes a temperature sensor.

[0129] In some embodiments, the chilled water system further includes a first operating mode in which the cooling tower 2 is configured to operably provide cooling capacity to the cooling side of the chiller unit 1. In the first operating mode, the water storage container 3 does not provide cooling capacity to the cooling side of the chiller unit 1. The first operating mode is also the cooling tower 2 cooling circulation mode.

[0130] In some embodiments, the chilled water system is in a first operating mode when the following conditions are met:

[0131] T1>T min ;

[0132] T2+ΔT2≥T3+ΔT3; and

[0133] T4≤T1+ΔT4.

[0134] Wherein, T1 is the detected temperature value of the first temperature sensing element 51;

[0135] T min This is the lower limit value for the cooling return water temperature protection of chiller unit 1;

[0136] T2 is the temperature value detected by the second temperature sensing element 52;

[0137] ΔT2 is the temperature difference setpoint for heat exchanger 4;

[0138] T3 is the temperature value detected by the third temperature sensing element 53;

[0139] ΔT3 is the approximation setting value for cooling tower 2;

[0140] T4 is the temperature value detected by the fourth temperature sensing element 54;

[0141] ΔT4 is the absolute value set for the temperature difference between the cooling inlet and outlet water of chiller unit 1.

[0142] ΔT2 characterizes the heat exchange capacity of heat exchanger 4, which is the difference between the temperature reached by the cooling water of chiller unit 1 after heat exchange with the water in water storage container 3 and the temperature of the water in water storage container 3.

[0143] ΔT3 is the approximation setpoint for cooling tower 2. It represents the difference between the temperature reached by the cooling water after heat exchange in cooling tower 2 and the wet-bulb temperature surrounding cooling tower 2.

[0144] ΔT4 is the absolute value set for the cooling water inlet and outlet temperature difference of chiller unit 1. It represents the absolute value set for the difference between the cooling water outlet temperature and the cooling water return temperature on the cooling side of chiller unit 1.

[0145] First, T1 > T min The conditions for normal operation and start-up of the unit are met.

[0146] Secondly, T2+ΔT2 represents the water temperature that the water in storage container 3 can reach after passing through heat exchanger 4. This is the water temperature at which the refrigerant can be cooled in the condenser of chiller unit 1. T3+ΔT3 represents the cooling return water temperature that can be achieved in the stand-alone cooling tower operation mode. When the water temperature that the water in storage container 3 can reach after heat exchange through heat exchanger 4 is higher than the water temperature that can be achieved in the stand-alone cooling tower operation mode, the cooling circulation mode of "storage container 3 + plate heat exchanger side circulation pump 11 + heat exchanger 4" does not need to be operated.

[0147] Finally, T4≤T1+ΔT4 indicates that the cooling tower has the ability to completely cool the chiller unit's condenser, so it operates in the first working mode, which is the cooling tower 2 cooling cycle mode.

[0148] In some embodiments, T min The value range is 15℃~18℃, with 15℃ being preferred.

[0149] In some embodiments, the value of ΔT1 ranges from 2℃ to 4℃, preferably 3℃.

[0150] In some embodiments, the value of ΔT2 ranges from 1℃ to 3℃, preferably 1.5℃.

[0151] In some embodiments, the value of ΔT3 ranges from 2.5℃ to 5℃, preferably 4℃.

[0152] In some embodiments, the value of ΔT4 ranges from 5°C to 8°C, preferably 5°C.

[0153] In some embodiments, in the first operating mode, cooling tower 2 is not always on. Cooling tower 2 is configured to operate when T1 > T min It is activated at +ΔT1.

[0154] T1>T min +ΔT1 indicates that the cooling return water temperature on the cooling side of chiller unit 1 is relatively high. In order to reduce the return water temperature and improve the operating efficiency of chiller unit 1, the cooling tower fan needs to be turned on to enhance the heat exchange between the cooling water and the outdoor atmosphere, so as to make the cooling return water temperature as close as possible to the wet-bulb temperature of the outdoor atmosphere.

[0155] In some embodiments, in the first operating mode, the cooling tower 2 is configured such that when T1 ≤ T min +ΔT1, and T1>T min Close when needed.

[0156] First, we need to ensure the normal operation and startup of chiller unit 1, so T1 > T. min When T1≤T min When +ΔT1, it indicates that the cooling return water temperature on the cooling side of chiller unit 1 is low, and there is no need to turn on the cooling tower fan to enhance heat exchange.

[0157] In some embodiments, the chilled water system further includes a second operating mode in which the water storage container 3 is configured to operably provide cooling capacity to the cooling side of the chiller unit 1. In this second operating mode, the cooling tower 4 does not provide cooling capacity to the cooling side of the chiller unit 1. The second operating mode is also a cooling cycle mode of water storage container 3 + heat exchanger 4.

[0158] In some embodiments, the chilled water system is in the second operating mode when the following conditions are met:

[0159] T1>T min ;as well as

[0160] T2+ΔT2<T3+ΔT3.

[0161] Wherein, T1 is the detected temperature value of the first temperature sensing element 51;

[0162] T min This is the lower limit value for the cooling return water temperature protection of chiller unit 1;

[0163] T2 is the temperature value detected by the second temperature sensing element 52;

[0164] ΔT2 is the temperature difference setpoint for heat exchanger 4;

[0165] T3 is the temperature value detected by the third temperature sensing element 53;

[0166] ΔT3 is the approximation setting value for cooling tower 2.

[0167] ΔT2 characterizes the heat exchange capacity of heat exchanger 4, which is the difference between the temperature reached by the cooling water of chiller unit 1 after heat exchange with the water in water storage container 3 and the temperature of the water in water storage container 3.

[0168] ΔT3 is the approximation setpoint for cooling tower 2. It represents the difference between the temperature reached by the cooling water after heat exchange in cooling tower 2 and the wet-bulb temperature surrounding cooling tower 2.

[0169] T2+ΔT2 represents the water temperature that the water in storage container 3 can reach after passing through heat exchanger 4. This is the water temperature at which the refrigerant can be cooled in the condenser of chiller unit 1. This process fully utilizes the natural cold source in storage container 3. Switching to this mode requires determining the cooling return water temperature that can be achieved in the standalone cooling tower operation mode. T3+ΔT3 is the cooling return water temperature that can be achieved in the standalone cooling tower operation mode. When the water temperature that the water in storage container 3 can reach after heat exchange through heat exchanger 4 is lower than the water temperature that can be achieved in the standalone cooling tower operation mode, the system switches to the "storage container 3 + heat exchanger 4" cooling cycle mode to fully utilize the natural cold source and achieve greater energy savings.

[0170] The second operating mode utilizes the lower-temperature natural water flowing in the water storage container 3 to cool the chiller unit's condenser, thereby improving the unit's operating efficiency.

[0171] In some embodiments, the chilled water system further includes a third operating mode in which both the cooling tower 2 and the water storage container 3 are configured to operably provide cooling capacity to the cooling side of the chiller unit 1. In the third operating mode, both the cooling tower 2 and the water storage container 3 can provide cooling capacity to the cooling side of the chiller unit 1. The third operating mode is also a dual-cooling-source cooling cycle mode of cooling tower 2, water storage container 3, and heat exchanger 4.

[0172] In some embodiments, the chilled water system operates in the third mode when the following conditions are met:

[0173] T1>T min ;

[0174] T2+ΔT2≥T3+ΔT3;

[0175] T4 > T1 + ΔT4; and

[0176] T4>T2+ΔT2.

[0177] Wherein, T1 is the detected temperature value of the first temperature sensing element 51;

[0178] T min This is the lower limit value for the cooling return water temperature protection of chiller unit 1;

[0179] T2 is the temperature value detected by the second temperature sensing element 52;

[0180] ΔT2 is the temperature difference setpoint for heat exchanger 4;

[0181] T3 is the temperature value detected by the third temperature sensing element 53;

[0182] ΔT3 is the approximation setting value for cooling tower 2;

[0183] T4 is the temperature value detected by the fourth temperature sensing element 54;

[0184] ΔT4 is the absolute value set for the temperature difference between the cooling inlet and outlet water of chiller unit 1.

[0185] First, T1 > T min First, the conditions for normal operation and start-up of the unit are met. Second, T2+ΔT2≥T3+ΔT3, indicating that the "water storage container 3 + heat exchanger 4" cooling cycle mode cannot be operated alone. Finally, T4>T1+ΔT4 and T4>T2+ΔT2, indicating that the cooling tower does not have the ability to completely cool the unit's condenser, and the water temperature in water storage container 3 after heat exchange in heat exchanger 4 is still relatively low. Compared with the cooling water supply temperature T4 in the cooling tower-only mode, the cooling tower 2 cooling cycle mode cannot be operated alone. Therefore, in order to meet the heat dissipation requirements of the unit's condenser, combined cooling is required, that is, the dual cooling source cooling cycle mode needs to be operated.

[0186] In some embodiments, in the third operating mode, cooling tower 2 is configured such that when T1 > T min It is activated at +ΔT1.

[0187] T1>T min +ΔT1 indicates that the cooling return water temperature on the cooling side of chiller unit 1 is relatively high. In order to reduce the return water temperature and improve the operating efficiency of chiller unit 1, the cooling tower fan needs to be turned on to enhance the heat exchange between the cooling water and the outdoor atmosphere, so as to make the cooling return water temperature as close as possible to the wet-bulb temperature of the outdoor atmosphere.

[0188] In some embodiments, in the third operating mode, cooling tower 2 is configured such that when T1 ≤ T min +ΔT1, and T1>T min Close when needed.

[0189] First, we need to ensure the normal operation and startup of chiller unit 1, so T1 > T. min When T1≤T min When +ΔT1, it indicates that the cooling return water temperature on the cooling side of chiller unit 1 is low, and there is no need to turn on the cooling tower fan to enhance heat exchange.

[0190] The chilled water system provided in this embodiment combines a water storage container 3 with a cooling tower 2 to cool the condenser of the chilled water unit 1, achieving combined cooling from multiple cooling sources. Based on comparisons of outdoor temperature and humidity, water temperature in the water storage container 3, cooling inlet and outlet water temperatures of the chiller 1, and cooling return water protection temperature of the chiller 1, the system adapts and switches cooling operation modes through the action of electric valves in the pipeline. By comprehensively utilizing multiple cooling sources, the system minimizes the cooling water temperature and ensures stable and efficient operation of the chilled water system.

[0191] The following is combined with Figure 1 As shown, some specific embodiments of the ice-water system are described in detail.

[0192] In some specific embodiments, the chilled water system includes a chiller unit 1, a cooling tower 2, a water storage container 3, a heat exchanger 4, a water supply tank 61, a water return tank 62, and a user side 7.

[0193] The outlet on the cooling side of chiller unit 1 is connected to cooling tower 2 via a first pipe, and the inlet on the cooling side of chiller unit 1 is connected to cooling tower 2 via a second pipe. A first valve 91 is provided on the first pipe to control the on / off state of the first pipe. A second valve 92 is provided on the second pipe to control the on / off state of the second pipe. Optionally, the first valve 91 and the second valve 92 are on / off valves. A fourth temperature sensing element 54 is also provided on the first pipe.

[0194] The cooling-side outlet of chiller unit 1 is connected to heat exchanger 4 via a third pipe, and the cooling-side inlet of chiller unit 1 is connected to heat exchanger 4 via a fourth pipe. A third valve 93 is installed on the third pipe to control the on / off state of the third pipe. A fourth valve 94 is installed on the fourth pipe to control the on / off state of the fourth pipe. Optionally, the third valve 93 and the fourth valve 94 are on / off valves.

[0195] A first pump 81 is also provided at the inlet of the cooling side of the chiller unit 1. The first pump 81 is used to provide power for the circulation of cooling water on the cooling side of the chiller unit 1.

[0196] The inlet of the chiller unit 1 on the cooling side is also provided with a first temperature detection element 51, which is used to detect the cooling return water temperature on the cooling side of the chiller unit 1.

[0197] Cooling tower 2 is equipped with a water supply pipeline, and a fifth valve 95 is installed on the water supply pipeline. The fifth valve 95 is used to control the opening and closing of the water supply pipeline. When the fifth valve 95 is open, cooling water is supplied through the water supply pipeline.

[0198] A third temperature detection element 53 is also installed near the cooling tower 2. The third temperature detection element 53 is used to detect the ambient wet-bulb temperature near the cooling tower 2.

[0199] The outlet of the water storage container 3 is connected to the heat exchanger 4 via a fifth pipe, and the inlet of the water storage container 3 is connected to the heat exchanger 4 via a sixth pipe. A second pump 82 is installed on the fifth pipe, which provides power for the water flow between the water storage container 3 and the heat exchanger 4.

[0200] The water storage container 3 is also equipped with a water inlet pipe and a water outlet pipe. The water outlet pipe is equipped with a sixth valve 96, which controls the opening and closing of the water outlet pipe. When the sixth valve 96 is open, the natural water in the water storage container 3 can be discharged through the water outlet pipe. The water inlet pipe is equipped with a seventh valve 97, which controls the opening and closing of the water inlet pipe. When the seventh valve 97 is open, natural water can be injected into the water storage container 3 through the water inlet pipe.

[0201] The water storage container 3 is equipped with a second temperature detection element 52, which is used to detect the water temperature of the natural water in the water storage container 3.

[0202] The outlet of the chilled side of the chiller unit 2 is connected to the water supply tank 61 through the seventh pipe. The water supply tank 61 is connected to the user side 7 through the eighth pipe. The user side 7 is connected to the return water tank 62 through the ninth pipe. The return water tank 62 is connected to the inlet of the chilled side of the chiller unit 2 through the tenth pipe.

[0203] The eighth pipeline is equipped with the third pump 83, and the tenth pipeline is equipped with the fourth pump 84.

[0204] The chilled water circulation on the chilled side of chiller unit 1: The low-temperature water produced by chiller unit 1 is buffered in supply tank 61 and then pumped to user side 7 by third pump 83. After heat exchange, the low-temperature water is sent to return tank 62 and then back to chiller unit 1 via fourth pump 84, completing the chilled water circulation on the chilled side of chiller unit 1. Optionally, the temperature of the low-temperature water produced by chiller unit 1 is 0.5℃. The chilled water circulation on the chilled side of chiller unit 1 provides chilled water to users through third pump 83, supply tank 61, return tank 62, and fourth pump 84. Supply tank 61 serves two purposes: buffering chilled water and increasing the system's adaptability to changes in external load, thus mitigating the impact of load changes on chiller unit 1.

[0205] In some specific embodiments, the cooling cycle includes a single-cooling-source cooling cycle and a dual-cooling-source cooling cycle. The single-cooling-source cooling cycle includes two modes: a cooling tower 2 cooling cycle and a "water storage container 3 + heat exchanger 4" cooling cycle. The dual-cooling-source cooling cycle combines the cooling tower 2 cooling cycle with the "water storage container 3 + heat exchanger 4" cooling cycle. The cooling water from the chiller unit 1, after heat exchange in the cooling tower 2 or / or the heat exchanger 4, is returned to the chiller unit 1 via the first pump 81, completing the cooling cycle.

[0206] First working mode - Cooling tower 2 cooling cycle mode: Third valve 93 and fourth valve 94 are closed, first valve 91 and second valve 92 are open, first pump 81 is turned on, the cooling water from chiller unit 1 enters cooling tower 2, and after heat exchange in cooling tower 2, it returns to chiller unit 1 for heat exchange to complete the cooling cycle.

[0207] Second working mode - cooling circulation mode of water storage container 3 + heat exchanger 4: the first valve 91 and the second valve 92 are closed, the third valve 93 and the fourth valve 94 are open, the cooling water from the chiller unit 1 is heated by the heat exchanger 4, and then returned to the chiller unit 1 by the first pump 81 to complete the internal cooling circulation. At the same time, the sixth valve 96 and the seventh valve 97 are opened, the cooling water supply from the water storage container 3 enters the heat exchanger 4 through the second pump 82 to complete the heat exchange, and then returns to the water storage container 3 to complete the external cooling circulation. During the process, the condensation heat of the chiller unit 1 is transferred from the internal cooling circulation to the external cooling circulation through the heat exchanger 4, and then the heat is carried away by the inlet and outlet flowing water of the water storage container 3.

[0208] Third working mode - dual cooling source cooling circulation mode: valves 91, 92, 93 and 94 are open, valves 96 and 97 are open, and part of the cooling water output from chiller unit 1 is diverted to cooling tower 2. Cooling tower fan 21 is turned on for heat exchange. At the same time, part of the cooling water output from chiller unit 1 is also diverted to heat exchanger 4 for heat exchange. After heat exchange, the water flows back to chiller unit 1 through pump 81. Meanwhile, the cooling water supply from storage container 3 enters heat exchanger 4 through pump 82 to complete heat exchange, and then returns to storage container 3.

[0209] In some specific embodiments, the chilled water system is in the first operating mode - cooling tower 2 cooling circulation mode when the following conditions are met.

[0210] T1>T min ;

[0211] T2+ΔT2≥T3+ΔT3; and

[0212] T4≤T1+ΔT4.

[0213] Wherein, T1 is the detected temperature value of the first temperature sensing element 51;

[0214] T min This is the lower limit value for the cooling return water temperature protection of chiller unit 1;

[0215] T2 is the temperature value detected by the second temperature sensing element 52;

[0216] ΔT2 is the temperature difference setpoint for heat exchanger 4;

[0217] T3 is the temperature value detected by the third temperature sensing element 53;

[0218] ΔT3 is the approximation setting value for cooling tower 2;

[0219] T4 is the temperature value detected by the fourth temperature sensing element 54;

[0220] ΔT4 is the absolute value set for the temperature difference between the cooling inlet and outlet water of chiller unit 1.

[0221] First, T1 > T min The conditions for normal operation and start-up of the unit are met.

[0222] Secondly, T2+ΔT2 represents the water temperature that the water in storage container 3 can reach after passing through heat exchanger 4. This is the water temperature at which the refrigerant can be cooled in the condenser of chiller unit 1. T3+ΔT3 represents the cooling return water temperature that can be achieved in the stand-alone cooling tower operation mode. When the water temperature that the water in storage container 3 can reach after heat exchange through heat exchanger 4 is higher than the water temperature that can be achieved in the stand-alone cooling tower operation mode, the cooling circulation mode of "storage container 3 + plate heat exchanger side circulation pump 11 + heat exchanger 4" does not need to be operated.

[0223] Finally, T4≤T1+ΔT4 indicates that the cooling tower has the ability to completely cool the chiller unit's condenser, so it operates in the first working mode, which is the cooling tower 2 cooling cycle mode.

[0224] In the first operating mode, cooling tower 2 is not always on. Cooling tower 2 is configured to operate when T1 > T min Cooling tower 2 is activated when +ΔT1. Cooling tower 2 is configured to activate when T1 ≤ T... min+ΔT1, and T1>T min Close when needed.

[0225] T min This is the lower limit for the cooling return water temperature protection of chiller unit 1. Set T... min This is mainly to prevent the cooling return water temperature on the cooling side of chiller unit 1 from being too low, causing chiller unit 1 to trigger low temperature protection and fail to operate normally; that is, when the cooling return water temperature of chiller unit 1 is lower than T... min At that time, chiller unit 1 cannot operate normally. Therefore, T1 > T min This is a necessary condition for the normal start-up of chiller unit 1.

[0226] ΔT1 represents the starting temperature deviation value of the cooling tower fan. Setting ΔT1 is primarily used to determine whether the cooling tower fan needs to be started. If the cooling return water temperature on the cooling side of chiller unit 1 is low and close to the outdoor air wet-bulb temperature, there is no need to start the cooling tower fan to enhance heat exchange. Therefore, setting ΔT1 can prevent frequent start-ups and shutdowns of cooling tower 2.

[0227] T1>T min +ΔT1 indicates that the cooling return water temperature on the cooling side of chiller unit 1 is relatively high. In order to reduce the return water temperature and improve the operating efficiency of chiller unit 1, the cooling tower fan needs to be turned on to enhance the heat exchange between the cooling water and the outdoor atmosphere, so as to make the cooling return water temperature as close as possible to the wet-bulb temperature of the outdoor atmosphere.

[0228] First, we need to ensure the normal operation and startup of chiller unit 1, so T1 > T. min When T1≤T min When +ΔT1, it indicates that the cooling return water temperature on the cooling side of chiller unit 1 is low, and there is no need to turn on the cooling tower fan to enhance heat exchange.

[0229] In some specific embodiments, the chilled water system is in the second operating mode - cooling circulation mode of water storage container 3 + heat exchanger 4 when the following conditions are met.

[0230] T1>T min ;as well as

[0231] T2+ΔT2<T3+ΔT3.

[0232] Wherein, T1 is the detected temperature value of the first temperature sensing element 51;

[0233] T min This is the lower limit value for the cooling return water temperature protection of chiller unit 1;

[0234] T2 is the temperature value detected by the second temperature sensing element 52;

[0235] ΔT2 is the temperature difference setpoint for heat exchanger 4;

[0236] T3 is the temperature value detected by the third temperature sensing element 53;

[0237] ΔT3 is the approximation setting value for cooling tower 2.

[0238] T2+ΔT2 represents the water temperature that the water in storage container 3 can reach after passing through heat exchanger 4. This is the water temperature at which the refrigerant can be cooled in the condenser of chiller unit 1. This process fully utilizes the natural cold source in storage container 3. Switching to this mode requires determining the cooling return water temperature that can be achieved in the standalone cooling tower operation mode. T3+ΔT3 is the cooling return water temperature that can be achieved in the standalone cooling tower operation mode. When the water temperature that the water in storage container 3 can reach after heat exchange through heat exchanger 4 is lower than the water temperature that can be achieved in the standalone cooling tower operation mode, the system switches to the "storage container 3 + heat exchanger 4" cooling cycle mode to fully utilize the natural cold source and achieve greater energy savings.

[0239] In some specific embodiments, the chilled water system is in the third operating mode - dual cooling source cooling cycle mode - when the following conditions are met.

[0240] T1>T min ;

[0241] T2+ΔT2≥T3+ΔT3;

[0242] T4 > T1 + ΔT4; and

[0243] T4>T2+ΔT2.

[0244] Wherein, T1 is the detected temperature value of the first temperature sensing element 51;

[0245] T min This is the lower limit value for the cooling return water temperature protection of chiller unit 1;

[0246] T2 is the temperature value detected by the second temperature sensing element 52;

[0247] ΔT2 is the temperature difference setpoint for heat exchanger 4;

[0248] T3 is the temperature value detected by the third temperature sensing element 53;

[0249] ΔT3 is the approximation setting value for cooling tower 2;

[0250] T4 is the temperature value detected by the fourth temperature sensing element 54;

[0251] ΔT4 is the absolute value set for the temperature difference between the cooling inlet and outlet water of chiller unit 1.

[0252] First, T1 > T minFirst, the conditions for normal operation and start-up of the unit are met. Second, T2+ΔT2≥T3+ΔT3, indicating that the "water storage container 3 + heat exchanger 4" cooling cycle mode cannot be operated alone. Finally, T4>T1+ΔT4 and T4>T2+ΔT2, indicating that the cooling tower does not have the ability to completely cool the unit's condenser, and the water temperature in water storage container 3 after heat exchange in heat exchanger 4 is still relatively low. Compared with the cooling water supply temperature T4 in the cooling tower-only mode, the cooling tower 2 cooling cycle mode cannot be operated alone. Therefore, in order to meet the heat dissipation requirements of the unit's condenser, combined cooling is required, that is, the dual cooling source cooling cycle mode needs to be operated.

[0253] In the third operating mode, cooling tower 2 is not always on. Cooling tower 2 is configured to operate when T1 > T2. min Cooling tower 2 is activated when +ΔT1. Cooling tower 2 is configured to activate when T1 ≤ T... min +ΔT1, and T1>T min Close when needed.

[0254] T1>T min +ΔT1 indicates that the cooling return water temperature on the cooling side of chiller unit 1 is relatively high. In order to reduce the return water temperature and improve the operating efficiency of chiller unit 1, the cooling tower fan needs to be turned on to enhance the heat exchange between the cooling water and the outdoor atmosphere, so as to make the cooling return water temperature as close as possible to the wet-bulb temperature of the outdoor atmosphere.

[0255] First, we need to ensure the normal operation and startup of chiller unit 1, so T1 > T. min When T1≤T min When +ΔT1, it indicates that the cooling return water temperature on the cooling side of chiller unit 1 is low, and there is no need to turn on the cooling tower fan to enhance heat exchange.

[0256] In the above modes, cooling tower 2 and water storage container 3 are configured such that T1≤T min At this time, the supply of cooling capacity to the cooling side of chiller unit 1 is stopped. First valve 91 and second valve 92 are closed, third valve 93 and fourth valve 94 are open, first pump 81 is activated, and second pump 82 is deactivated. The cooling water output from chiller unit 1 passes through heat exchanger 4 and then returns to chiller unit 1 via first pump 81, completing the cooling cycle. In this process, the cooling water passes through heat exchanger 4 only for pipeline bypass and does not involve heat exchange.

[0257] T1≤T min This indicates that the cooling water return temperature is extremely low. In order to ensure the normal start-up and operation of the unit, the cooling water needs to operate in internal circulation mode to increase the cooling water return temperature.

[0258] Among them, T min The value range is 15℃~18℃. 15℃ is preferred. min This is the lower limit for the cooling return water temperature protection of the chiller unit; generally, the cooling return water temperature is lower than T. minThe chiller unit will then trigger low-temperature protection and fail to start and operate normally. min The set temperature is used to protect the chiller unit from operating abnormally.

[0259] The value of ΔT1 ranges from 2℃ to 4℃, with 3℃ being preferred. ΔT1 is the starting temperature deviation value of the cooling tower fan, which can be set above zero. It is used to determine whether the cooling tower fan needs to be turned on, and is mainly a criterion for energy saving considerations.

[0260] The value of ΔT2 ranges from 1℃ to 3℃, with 1.5℃ being preferred. ΔT2 is the temperature difference setpoint of the heat exchanger, which can be set above zero. It is a performance parameter of the heat exchanger, representing its heat exchange capacity. The smaller the value of ΔT2, the stronger the heat exchange capacity.

[0261] The value of ΔT3 ranges from 2.5℃ to 5℃, with 4℃ being preferred. ΔT3 is the cooling tower approximation setting value, which can be set above zero. It reflects the heat dissipation capacity of the cooling tower in handling water and is a performance parameter of the cooling tower. The smaller the value of ΔT3, the better the heat dissipation.

[0262] The value of ΔT4 ranges from 5℃ to 8℃, with 5℃ being the preferred value.

[0263] In some embodiments, based on the stable cooling demand such as water volume and temperature on the chiller side of the chiller unit, a multi-cooling source system is built and controlled on the cooling side. This can comprehensively consider the changing factors of the chiller side demand and achieve a comprehensive upgrade of the multi-cooling source chiller system and its control.

[0264] In some embodiments, the inlet and outlet flow rates of the water storage container 3 are set to ensure stable water volume and cooling water temperature. Alternatively, the inlet and outlet flow rates of the water storage container 3 can be variable, and a flow sensor can be added. The cooling water supply and return flow rates of the water storage container 3 can be adjusted by the variable frequency operation of the second pump 82 to achieve fine control.

[0265] In some embodiments, in addition to the water storage container 3 as a cooling source, a cooling tower 2 is added as a backup / shared cooling source to enhance the operational stability of the chilled water system. The combined cooling supply of the water storage container 3 and the cooling tower 2 reduces the required cooling tower capacity, integrates multiple cooling sources, reduces initial equipment investment, and minimizes cooling water temperature. The piping connecting the chiller unit to the heat exchanger is used, and valves are switched to bypass the cooling tower during the transitional season when it is undercooled. Based on comparisons of outdoor temperature and humidity, water temperature in the water storage container, chiller unit cooling inlet and outlet water temperatures, and chiller unit cooling return water protection temperature, the cooling operation mode is switched adaptively via the operation of electric valves in the piping, ensuring stable operation of the chilled water system and improving the operating efficiency of the chiller unit.

[0266] Based on the embodiments disclosed above, in the absence of explicit denial or conflict, the technical features of one embodiment may be advantageously combined with one or more other embodiments.

[0267] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A chilled water system, characterized in that, include: A chiller unit (1) includes a chilling side and a cooling side, wherein the chilling side is configured to supply chilled water to the user side; Cooling tower (2), connected to the cooling side of the chiller unit (1); and A water storage container (3) is connected to the cooling side of the chiller unit (1), and the water storage container (3) is configured to hold natural water. The cooling tower (2) and the water storage container (3) are configured such that at least one of them can operatively provide cooling capacity to the cooling side of the chiller unit (1); It also includes a heat exchanger (4) that connects the water storage container (3) and the cooling side of the chiller unit (1), and the heat exchanger (4) is configured to achieve heat exchange between the water storage container (3) and the chiller unit (1); It also includes a first operating mode in which the cooling tower (2) is configured to operably provide cooling capacity to the cooling side of the chiller unit (1); Also includes: The first temperature sensing element (51) is located at the inlet of the cooling side of the chiller unit (1); The second temperature sensing element (52) is disposed in the water storage container (3); The third temperature detection element (53) is located near the cooling tower (2) and is used to detect the ambient temperature near the cooling tower (2); The fourth temperature detection element (54) is located on the pipeline connecting the outlet of the chiller unit (1) on the cooling side to the cooling tower (2); The chilled water system operates in its first mode when the following conditions are met: ； ;as well as ； in, The detected temperature value is the temperature value of the first temperature sensing element (51); The lower limit value for the cooling return water temperature protection of the chiller unit (1); The detected temperature value of the second temperature sensing element (52); The temperature difference setpoint for heat exchanger (4); The detected temperature value is the temperature value of the third temperature sensing element (53); Set the approximation value for the cooling tower (2); The detected temperature value of the fourth temperature sensing element (54); Set an absolute value for the temperature difference between the cooling water inlet and outlet of the chiller unit (1).

2. The chilled water system as described in claim 1, characterized in that, The cooling tower (2) is configured to... It is turned on at a certain time to provide cooling capacity to the cooling side of the chiller unit (1), wherein, The detected temperature value is the temperature value of the first temperature sensing element (51); The lower limit value for the cooling return water temperature protection of the chiller unit (1); This refers to the temperature deviation value during the start-up of the cooling tower fan.

3. The chilled water system as described in claim 2, characterized in that, The cooling tower (2) is configured to... ,and When shut off, the chiller stops supplying cooling capacity to the cooling side of the chiller unit (1).

4. The chilled water system as described in any one of claims 1 to 3, characterized in that, The cooling tower (2) and the water storage container (3) are configured to... At that time, the supply of cooling capacity to the cooling side of the chiller unit (1) shall be stopped; wherein, The detected temperature value is the temperature value of the first temperature sensing element (51); The lower limit value for the cooling return water temperature protection of the chiller unit (1).

5. The chilled water system as described in claim 1, characterized in that, The cooling tower (2) is configured to... It will be turned on at that time.

6. The chilled water system as described in claim 1, characterized in that, The cooling tower (2) is configured to... ,and Close when needed.

7. The chilled water system as described in claim 1, characterized in that, It also includes a second operating mode in which the water storage container (3) is configured to operably provide cooling capacity to the cooling side of the chiller unit (1).

8. The chilled water system as described in claim 7, characterized in that, The chilled water system operates in the second mode when the following conditions are met: ； as well as ； in, The detected temperature value is the temperature value of the first temperature sensing element (51); The lower limit value for the cooling return water temperature protection of the chiller unit (1); The detected temperature value of the second temperature sensing element (52); The temperature difference setpoint for heat exchanger (4); The detected temperature value is the temperature value of the third temperature sensing element (53); Set the approximation value for the cooling tower (2).

9. The chilled water system as described in claim 1, characterized in that, It also includes a third operating mode in which both the cooling tower (2) and the water storage container (3) are configured to operably provide cooling capacity to the cooling side of the chiller unit (1).

10. The chilled water system as described in claim 9, characterized in that, The chilled water system operates in the third mode when the following conditions are met: ； ； ； as well as ； in, The detected temperature value is the temperature value of the first temperature sensing element (51); The lower limit value for the cooling return water temperature protection of the chiller unit (1); The detected temperature value of the second temperature sensing element (52); The temperature difference setpoint for heat exchanger (4); The detected temperature value is the temperature value of the third temperature sensing element (53); Set the approximation value for the cooling tower (2); The detected temperature value of the fourth temperature sensing element (54); Set an absolute value for the temperature difference between the cooling water inlet and outlet of the chiller unit (1).

11. The chilled water system as described in claim 10, characterized in that, The cooling tower (2) is configured to... It will be turned on at that time.

12. The chilled water system as described in claim 10, characterized in that, The cooling tower (2) is configured to... ,and Close when needed.

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