Method and system for controlling pollution discharge of water storage tank of air conditioning unit and unit

Abstract

The invention discloses an air conditioning unit water storage tank pollution discharge control method and system and a unit. The method comprises the steps that in the operation process of an air conditioning unit, the instantaneous evaporation capacity of water in a condenser is calculated according to a preset time interval and current operation parameters of the air conditioning unit, so that an intermediate statistical value is obtained; in the current statistical period, accumulating the intermediate statistical values to obtain a total statistical value; when the total statistical value is larger than or equal to the given target blowdown amount, the blowdown action is started, the air conditioning unit is kept running continuously, and the blowdown action comprises the steps that a blowdown valve in the water storage tank is opened; the pollution discharge time is calculated according to the target pollution discharge amount and the structure parameters of the water storage tank; clearing the total statistical value; and when the pollution discharge duration reaches the pollution discharge time, the pollution discharge valve is closed. According to the pollution discharge control method, pollution discharge according to needs is achieved by dynamically monitoring the evaporation capacity of the water in the condenser, the water resource utilization rate is remarkably increased, it is ensured that the water in the water storage tank is kept in a high-quality state, and continuous and stable operation of a unit is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage discharge control for air conditioners, and particularly to a sewage discharge control method, system and unit for a water storage tank of an air conditioner unit based on chilled water refrigeration. Background Art

[0002] In water-cooled refrigeration air conditioner units, the sewage discharge control of the water storage tank is an important link to ensure the efficient operation of the unit. Traditional water-cooled chillers and evaporative-cooled chillers usually adopt a timed sewage discharge method, that is, sewage discharge is carried out according to the cumulative operation time of the compressor. However, this method has obvious defects. First of all, the traditional method can only carry out sewage discharge when the unit is shut down, resulting in untimely sewage discharge and inability to carry out sewage discharge according to actual needs during the operation of the unit. Secondly, the traditional sewage discharge method usually adopts a one-time estimated drainage time, resulting in a large amount of drainage, which not only wastes water resources, but also prolongs the shutdown time of the unit and affects the normal operation of the unit. In addition, the traditional sewage discharge method cannot be dynamically adjusted according to the operation load of the unit, easily causing ineffective sewage discharge and further exacerbating the waste of water resources. Summary of the Invention

[0003] The purpose of the present invention is to provide a sewage discharge control method, system and unit for a water storage tank of an air conditioner unit based on chilled water refrigeration, which can carry out dynamic sewage discharge according to actual needs during the operation of the unit to solve the above technical problems.

[0004] To achieve the above purpose, the present invention provides a sewage discharge control method for a water storage tank of an air conditioner unit based on chilled water refrigeration, which includes:

[0005] During the operation of the air conditioner unit, calculate the instantaneous evaporation amount of water in the condenser according to a preset time interval and the current operation parameters of the air conditioner unit to obtain an intermediate statistical value;

[0006] Accumulate the intermediate statistical value within the current statistical period to obtain a total statistical value;

[0007] When the total statistical value is greater than or equal to a given target sewage discharge amount, start a sewage discharge action and keep the air conditioner unit running continuously. The sewage discharge action includes:

[0008] Open the sewage discharge valve in the water storage tank;

[0009] Calculate the sewage discharge time according to the target sewage discharge amount and the structural parameters of the water storage tank;

[0010] Clear the total statistical value;

[0011] When the sewage discharge duration reaches the sewage discharge time, close the sewage discharge valve and enter the next statistical period.

[0012] Preferably, when the current statistical period reaches a preset period threshold and the sewage discharge action is not triggered, the current total statistical value is used as the target sewage discharge volume, and the sewage discharge action is forcibly triggered.

[0013] Preferably, the intermediate statistical value E is calculated according to the following formula:

[0014] E = Q h L

[0015] Q h = P + Q c

[0016] where P is the current operating power of the compressor of the air-conditioning unit, Q c is the instantaneous refrigerating capacity of the evaporator of the air-conditioning unit at present, and L is the latent heat of vaporization of the water in the water storage tank.

[0017] Preferably, the instantaneous refrigerating capacity Q of the evaporator of the air-conditioning unit is calculated according to the following formula c :

[0018] Q c = Q w * ρ * V * ΔT

[0019] where Q w is the current water flow rate in the evaporator of the air-conditioning unit, ρ is the average density of the water flowing in the evaporator, V is the average specific heat capacity of the water flowing in the evaporator, and ΔT is the arithmetic mean of the inlet water temperature and the outlet water temperature of the evaporator.

[0020] Preferably, the target sewage discharge volume is determined according to the target height of the water level drop in the water storage tank required during sewage discharge and the specifications of the water storage tank.

[0021] Preferably, the sewage discharge time t is calculated according to the following formula:

[0022]

[0023] where H is the full water height of the water storage tank, h is the target height of the water level drop during the sewage discharge process of the water storage tank, A is the cross-sectional area of the sewage outlet of the water storage tank, B is the top surface area of the water storage tank, and g is the gravitational acceleration constant.

[0024] The present invention also provides an air-conditioning unit based on chilled water refrigeration, which includes a compressor, an evaporator, a condenser, a controller, and a water storage tank for supplying chilled water to the air-conditioning unit. The controller controls the sewage discharge of the water storage tank based on the above-mentioned method for controlling the sewage discharge of the water storage tank of the air-conditioning unit.

[0025] The present invention also provides a sewage discharge control system for an air-conditioning unit based on chilled water refrigeration, which includes:

[0026] One or more processors;

[0027] A memory;

[0028] And one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the programs include instructions for executing the sewage discharge control method of the water storage tank of the air conditioner unit as described above.

[0029] The present invention also provides a computer-readable storage medium, which includes a computer program that can be executed by a processor to complete the sewage discharge control method of the water storage tank of the air conditioner unit as described above.

[0030] Compared with the prior art, the sewage discharge control method of the water storage tank of the air conditioner unit disclosed in the above technical solution of the present invention realizes on-demand sewage discharge by dynamically monitoring the evaporation amount of water in the condenser, significantly improves the utilization rate of water resources, and ensures that the water in the water storage tank remains in a high-quality state; adopts a real-time control strategy during operation to ensure the continuous and stable operation of the unit; combines structural parameters to calculate the sewage discharge time to avoid the adverse effects on the unit caused by excessive or insufficient sewage discharge. Thus, the above control method effectively solves the problems such as long system downtime and serious water resource waste caused by the traditional sewage discharge method. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flow chart of the sewage discharge control method in one embodiment of the present invention.

[0032] Figure 2 It is a flow chart of the sewage discharge control method in another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To describe in detail the technical content, structural features, achieved purposes and effects of the present invention, the following is described in detail in conjunction with the embodiments and with reference to the drawings.

[0034] This embodiment discloses a sewage discharge control method for the water storage tank of an air conditioner unit based on chilled water refrigeration, which is used for the automatic control of sewage discharge from the water storage tank during the operation of a water-cooled refrigeration air conditioner unit or an evaporative cooling air conditioner unit, so as to achieve on-demand automatic sewage discharge without affecting the operation of the unit.

[0035] As Figure 1 , the control method includes the following steps:

[0036] S1: During the operation of the air conditioner unit, calculate the instantaneous evaporation amount of water in the condenser according to a preset time interval (such as 10S) and the current operating parameters of the air conditioner unit to obtain an intermediate statistical value.

[0037] S2: During the current statistical period, accumulate the intermediate statistical values to obtain the total statistical value.

[0038] For example, during the current statistical period, starting from the starting point, a number of intermediate statistical values obtained are N(1), N(2), N(3) …… N(n) respectively, where N(n) is the intermediate statistical value obtained at the current statistical moment. Then the current total statistical value N = N(1) + N(2) + N(3) …… + N(n).

[0039] S3: Determine whether the current total statistical value is greater than or equal to the given target sewage discharge amount. If so, enter S4; if not, return to S3 for continuous determination.

[0040] S4: Initiate the sewage discharge action and keep the air-conditioning unit running continuously. The sewage discharge action includes:

[0041] Open the sewage discharge valve in the water storage tank;

[0042] Calculate the sewage discharge time according to the target sewage discharge amount and the structural parameters of the water storage tank;

[0043] Clear the total statistical value.

[0044] S5: Determine whether the sewage discharge duration has reached the sewage discharge time. If not, return to S5 for continuous determination; if so, enter S6.

[0045] S6: Close the sewage discharge valve and enter the next statistical period.

[0046] For the sewage discharge control method in this embodiment, by dynamically monitoring the evaporation amount of water in the condenser to achieve on-demand sewage discharge, it significantly improves the water resource utilization rate and ensures that the water in the water storage tank remains in a high-quality state. Secondly, adopting a real-time control strategy during operation ensures the continuous and stable operation of the unit. Furthermore, calculating the sewage discharge time in combination with the structural parameters avoids the adverse effects on the unit caused by excessive or insufficient sewage discharge. Thus, the above control method effectively solves the problems such as long system downtime and serious water resource waste caused by the traditional sewage discharge method.

[0047] On the other hand, when the preset cycle threshold is reached in the current statistical period but the sewage discharge action is not triggered, use the current total statistical value as the target sewage discharge amount and force the sewage discharge action to be triggered. This can avoid the problem of sewage discharge delay caused by insufficient evaporation amount for a long time.

[0048] Specifically, as Figure 2 , in the above step S3, if the current total statistical value is less than the given target sewage discharge amount, the following steps are also executed:

[0049] S30: Determine whether the current statistical period has reached the preset cycle threshold. If so, enter S31; if not, return to S3 for continuous determination.

[0050] S31: Assign the current total statistical value to the target sewage discharge amount, and proceed to step S4.

[0051] The cycle threshold refers to the maximum time range preset for accumulating the evaporation amount of condensed water, which can be specifically implemented using a fixed number of days or operating hours. For example, one hour, one day, three days, or seven days can be used as a statistical cycle.

[0052] For example, if the cycle threshold is one hour and the total statistical value obtained within one hour is still less than the target sewage discharge amount, then the sewage discharge action is forced to be immediately executed.

[0053] In this embodiment, through periodic forced drainage and dynamic adjustment mechanisms, it is ensured that the impurity concentration in the water storage tank is always lower than the critical value, while reducing the ineffective drainage amount. This solution can adapt to the operating requirements under different load conditions and achieve refined water quality management while maintaining the continuous operation of the unit.

[0054] On the other hand, calculate the intermediate statistical value E according to the following formula 1 and formula 2:

[0055] E = Q h L (Formula 1)

[0056] Q h = P + Q c (Formula 2)

[0057] where P is the current operating power of the compressor of the air-conditioning unit, and Q c is the instantaneous refrigerating capacity of the evaporator of the air-conditioning unit at present, and L is the latent heat of vaporization of the water in the water storage tank.

[0058] For the latent heat of vaporization L of the water in the water storage tank, it can be calculated based on the following formula 3:

[0059] L = a1 + a2 * T0 - a3 * T0 2 (Formula 3)

[0060] where a1, a2, and a3 are all constants obtained through experiments, and T0 is the temperature of the water in the water storage tank, which can be obtained through a temperature sensor.

[0061] Furthermore, calculate the instantaneous refrigerating capacity Q of the evaporator of the air-conditioning unit at present according to the following formula 4 c :

[0062] Q c = Q w * ρ * V * ΔT (Formula 4)

[0063] where Q wQ is the current water flow rate in the evaporator of the air conditioner unit (obtainable through a water flow sensor), ρ is the average density of the water flowing in the evaporator, V is the average specific heat capacity of the water flowing in the evaporator, and ΔT is the arithmetic mean of the inlet water temperature and the outlet water temperature of the evaporator.

[0064] Specifically, the average density ρ is calculated according to the following Formula 5 and Formula 6.

[0065] ρ = b1 * ΔT + b2 * ΔT 2 + b3 * ΔT 3 + b4 * ΔT 4 + b5 (Formula 5)

[0066] ΔT = (T1 + T2) / 2 (Formula 6)

[0067] Among them, b1, b2, b3, b4, and b5 are all constants obtained through experiments, and T1 and T2 are the inlet water temperature and the outlet water temperature of the evaporator respectively.

[0068] In addition, the average specific heat capacity V can also be calculated according to Formula 6 and the following Formula 7.

[0069] V = c1 * ΔT + c2 * T 2 + c3 * ΔT 3 + c4 * ΔT 4 + c5 * ΔT 5 + c6 (Formula 7)

[0070] Among them, c1, c2, c3, c4, c5, and c6 are all constants obtained through experiments.

[0071] On the other hand, the target sewage discharge amount is determined according to the target height of the water level drop in the water storage tank required during sewage discharge and the specifications of the water storage tank.

[0072] Specifically, if the length and width of the water storage tank are L1 and L2 respectively, and the set target height is h, then the target sewage discharge amount V1 = L1 * L2 * h.

[0073] On the other hand, the sewage discharge time t is calculated according to the following Formula 8:

[0074]

[0075] Among them, H is the full water height of the water storage tank, h is the target height of the water level drop during the sewage discharge process of the water storage tank, A is the cross-sectional area of the sewage outlet of the water storage tank, B is the top surface area of the water storage tank, and g is the gravitational acceleration constant.

[0076] In another preferred embodiment of the present invention, an air-conditioning unit based on cold water refrigeration is also disclosed, which includes a compressor, an evaporator, a condenser, a controller, and a water storage tank for supplying cold water to the air-conditioning unit. The controller controls the sewage discharge of the water storage tank based on the sewage discharge control method of the water storage tank of the air-conditioning unit in the above embodiment.

[0077] The present invention also discloses a sewage discharge control system, which includes one or more processors, a memory, and one or more programs. One or more programs are stored in the memory and are configured to be executed by the one or more processors. The programs include instructions for executing the sewage discharge control method as described above. The processor can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, which are used to execute relevant programs to implement the functions required by the modules in the sewage discharge control system of the embodiments of the present application, or to execute the sewage discharge control method of the method embodiments of the present application.

[0078] The present invention also discloses a computer-readable storage medium, which includes a computer program. The computer program can be executed by a processor to complete the sewage discharge control method as described above. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that integrates one or more available media. The available medium can be a read-only memory (ROM), a random access memory (RAM), a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape, a magnetic disk, or an optical medium, such as a digital versatile disc (DVD), or a semiconductor medium, such as a solid-state disk (SSD), etc.

[0079] The embodiments of the present application also disclose a computer program product or a computer program, which includes computer instructions. The computer instructions are stored in a computer-readable storage medium. The processor of the electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device executes the above sewage discharge control method.

[0080] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A sewage discharge control method for a water storage tank of an air conditioning unit based on cold water refrigeration, characterized in that, including: During the operation of the air conditioner unit, calculate the instantaneous evaporation amount of water in the condenser according to a preset time interval and the current operating parameters of the air conditioner unit to obtain an intermediate statistical value; Accumulate the intermediate statistical value within the current statistical period to obtain a total statistical value; When the total statistical value is greater than or equal to a given target sewage discharge amount, initiate a sewage discharge action and keep the air conditioner unit running continuously. The sewage discharge action includes: Open the sewage discharge valve in the water storage tank; Calculate the sewage discharge time according to the target sewage discharge amount and the structural parameters of the water storage tank; Clear the total statistical value; When the sewage discharge duration reaches the sewage discharge time, close the sewage discharge valve and enter the next statistical period.

2. The sewage discharge control method of the water storage tank of the air conditioner unit according to claim 1, characterized in that, When the current statistical period reaches a preset period threshold without triggering a sewage discharge action, use the current total statistical value as the target sewage discharge amount and forcefully trigger the sewage discharge action.

3. The sewage discharge control method for the water storage tank of the air conditioner unit according to claim 1, characterized in that Calculate the intermediate statistical value E according to the following formula: E = Q h L Q h = P + Q c Wherein, P is the current operating power of the compressor of the air conditioning unit, and Q c is the instantaneous cooling capacity of the evaporator of the air conditioning unit at present, and L is the latent heat of vaporization of the water in the water storage tank.

4. The sewage discharge control method of the water storage tank of the air conditioning unit according to claim 3, characterized in that, Calculate the instantaneous cooling capacity Q of the evaporator of the air conditioner unit according to the following formula c : Q c = Q w * ρ * V * ΔT where Q w is the current water flow rate in the evaporator of the air conditioning unit, ρ is the average density of the water flowing in the evaporator, V is the average specific heat capacity of the water flowing in the evaporator, and ΔT is the arithmetic mean of the inlet water temperature and the outlet water temperature of the evaporator.

5. The sewage discharge control method for the water storage tank of the air conditioner unit according to claim 1, characterized in that, Determine the target sewage discharge amount according to the target height of the water level drop required in the water storage tank during sewage discharge set and the specifications of the water storage tank.

6. The sewage discharge control method of the water storage tank of the air conditioner unit according to claim 1, characterized in that, Calculate the sewage discharge time t according to the following formula: where H is the full water height of the water storage tank, h is the target height of the water level drop during the sewage discharge process of the water storage tank, A is the cross-sectional area of the sewage discharge port of the water storage tank, B is the top surface area of the water storage tank, and g is the gravitational acceleration constant.

7. An air conditioning unit based on cold water refrigeration, characterized in that, including a compressor, an evaporator, a condenser, a controller, and a water storage tank for supplying cold water to the air conditioner unit, and the controller controls the sewage discharge of the water storage tank based on the air conditioner unit water storage tank sewage discharge control method according to any one of claims 1 to 6.

8. A sewage discharge control system for an air conditioning unit based on cold water refrigeration, characterized in that, including: one or more processors; a memory; and one or more programs, where one or more programs are stored in the memory and configured to be executed by the one or more processors. The programs include instructions for executing the air conditioner unit water storage tank sewage discharge control method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, including a computer program that can be executed by a processor to complete the air conditioner unit water storage tank sewage discharge control method according to any one of claims 1 to 6.

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