Source tail end switchable side hanging type uninterrupted water energy storage system

Abstract

The utility model relates to a source tail end switchable side hanging type uninterrupted water energy storage system which comprises a cold storage water tank, a cold release circulating water pump, a main water supply annular pipe network, a main water return annular pipe network, a water supply branch pipe, a water return branch pipe and a switching control valve. The top water distributor connecting pipe extends out of the tank and is communicated with the main water return annular pipe network through a water return branch pipe, the bottom water distributor connecting pipe extends out of the tank and is communicated with the main water supply annular pipe network through a water supply branch pipe, and the cold release circulating water pump and the switching control valve are connected in parallel and then are connected to the water supply branch pipe in series. The operation condition and efficiency of the water pump of the air conditioner water system are optimized, equipment and pipeline systems can be independently isolated and cut off, meanwhile, modularized increase and decrease can be achieved, redundancy is good, and the system is easy to guarantee and maintain.

Description

Technical Field

[0001] The utility model belongs to the field of HVAC engineering technology, and relates to a centralized air conditioning water energy storage or cold storage system that uses hot and cold water as the working medium of the air conditioning terminal. It can be generally used in data centers, electronic medicine, and other centralized air conditioning systems that provide cooling all year round and require uninterrupted cooling with a certain backup time, or in high-efficiency refrigeration room systems that increase the cooling capacity of the system to enhance the adjustment capacity of the refrigeration system. Background Art

[0002] Air-conditioning systems with year-round cooling needs and uninterrupted energy storage (cold storage) supply functions are generally used in high-energy-consuming industries. From the perspective of the country's macro-energy sustainable development and "dual carbon" strategy, as well as the urgent need for all industries to optimize and improve internal operating cost-effectiveness, such process air-conditioning systems have severe and urgent requirements for reducing consumption and costs.

[0003] Take the large and super-large centralized air conditioning systems in the data center (IDC) industry as an example. First, in the traditional IDC air conditioning chilled water system architecture, the uninterrupted cold storage system is in series with the chiller, air conditioning terminal and other components. The main circulation water pump needs to bear the equipment and pipeline resistance of the uninterrupted cold storage system. The pump unit determines its parameters such as head and power distribution power based on the most unfavorable working conditions during design and selection. However, for process air conditioning that operates uninterruptedly throughout the year, the operating time under the most unfavorable working conditions is relatively short. Even if variable frequency regulation is used, its hydraulic operating point is still not in the highest efficiency zone of the equipment characteristics, and the system operates in a non-optimal economic range for a long time throughout the year. Secondly, the misunderstandings or difficulties in the design of some air-conditioning cold storage systems often mix the flow directions of air-conditioning water in and out of the (vertical) cold storage device under the conditions of charging and discharging without distinguishing them, and irrationally use the upper and lower water distributors, resulting in the destruction of the "cold below, hot above" naturally stratified water "inclined temperature layer", causing the cold storage temperature gradient to weaken or disappear; causing the high-temperature return water and low-temperature cold storage water to be directly mixed with a certain intermediate temperature value before the cold water is discharged, resulting in a non-design water supply temperature of a certain intermediate temperature value. Therefore, the design cannot guarantee the thermal principles such as "push replacement", "gradual in and out", and "head and tail separation" that the water body of the water storage system should follow, which ultimately leads to the phenomenon of shortening the actual design time of cooling and the business risk of premature downtime.

[0004] Based on the above situation, there is a need for a source-end switchable side-mounted uninterrupted water energy storage system that can optimize the hydraulic transmission efficiency and system energy efficiency of the air-conditioning water system under various operating conditions throughout the year, while improving the efficiency of energy storage utilization, with the effects of energy conservation, emission reduction, cost reduction and efficiency improvement. Utility Model Content

[0005] Based on the above description, the utility model provides a source-end switchable side-hanging uninterruptible water energy storage system. The cold water storage tank (i.e., the uninterruptible energy storage device) adopts a "side-hanging" structure to form a parallel connection with the air-conditioning user terminal equipment; it is used as the "terminal" of the air-conditioning system when charging and cooling, and is used as the "source end" of the air-conditioning system to replace cold source equipment such as chillers when other end users need emergency uninterrupted cooling; this system is equipped with an independent cold release circulating water pump for boost operation, and the water flow is opposite under the charging and discharging state; it can correctly use the upper and lower water distributors in the (vertical) cold storage device to keep its internal temperature gradient and "inclined temperature layer" stable, and the cold release supply time can better reproduce the design requirements.

[0006] The utility model solves the above-mentioned technical problems with the following technical solutions: a source-end switchable side-mounted uninterrupted water energy storage system, comprising a cold water storage tank, a cold-release circulating water pump, a total water supply annular network, a total return water annular network, a water supply branch pipe, a return water branch pipe, and a switching control valve. A top water distributor and a top water distributor pipe are arranged on the top of the cold water storage tank, and a bottom water distributor and a bottom water distributor pipe are arranged on the bottom. The top water distributor pipe extends out of the tank and is connected to the total return water annular network through the return water branch pipe. The bottom water distributor pipe extends out of the tank and is connected to the total water supply annular network through the water supply branch pipe. The cold-release circulating water pump is connected in parallel with the switching control valve and then connected in series to the water supply branch pipe.

[0007] Under the structural form of the above technical solution, the utility model is further specifically described as follows.

[0008] Furthermore, the cooling-release circulating water pumps are arranged in groups connected in parallel to the water supply branch pipes, and the working direction of the cooling-release circulating water pumps is from the bottom water distributor of the cold water storage tank to the main water supply annular network.

[0009] Furthermore, when the cold storage water tank is self-charging and cooling, the cold storage circulation flow of the water system is as follows: the air-conditioning circulating water flows in from the water supply branch and flows out from the return branch. In this mode, the switch control valve is in the open state.

[0010] Furthermore, when the cold storage water tank is in external energy supply and cooling operation, the water system cold release circulation flow direction is as follows: the air-conditioning circulating water flows in from the return water branch, flows out from the water supply branch and is pressurized by the cold release circulating water pump. In this mode, the switch control valve is in the closed state.

[0011] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0012] The pipeline design of the utility model adopts a novel "by-pass" mode, avoiding the high resistance and inflexible bypass unloading problems of the traditional series connection type, and adopts a switching control valve to switch the entire system between the "source end" and "end" operating conditions, which can meet the requirements of the chilled water system to operate efficiently in both the normal cooling mode with high frequency throughout the year and the occasional extreme hourly fault operation (i.e. uninterrupted charging and cooling) mode; the reasonable use of different upper and lower water distributors in the charging and cooling modes will not destroy the cold storage temperature gradient, and optimize the operating conditions and efficiency of the water pump of the air-conditioning water system. The equipment and piping system can be independently isolated and cut off, and modular increase and decrease can be achieved at the same time, with good redundancy, and the system is easy to ensure maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a source-end switchable side-hung uninterrupted water energy storage system of the utility model;

[0014] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0015] 1. Cold storage water tank; 11. Top water distributor; 12. Top water distributor pipe; 13. Bottom water distributor; 14. Bottom water distributor pipe; 2. Cold release circulation water pump; 3. Main water supply ring network; 4. Main return water ring network; 5. Water supply branch pipe; 6. Return branch pipe; 7. Switching control valve; 8. First isolation valve; 9. Second isolation valve; 101. Cold storage circulation flow direction of water system; 102. Cold release circulation flow direction of water system. DETAILED DESCRIPTION

[0016] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0017] Reference Figure 1In this embodiment, a source-end switchable side-mounted uninterruptible water energy storage system includes a cold water storage tank 1, a cold release circulating water pump 2, a total water supply annular pipe network 3, a total return water annular pipe network 4, a water supply branch pipe 5, a return water branch pipe 6, and a switching control valve 7. The top of the cold water storage tank 1 is provided with a top water distributor 11 and a top water distributor pipe 12, and the bottom is provided with a bottom water distributor 13 and a bottom water distributor pipe 14. The top water distributor pipe 12 extends out of the tank and is connected to the total return water annular pipe network 4 through the return water branch pipe 6. The bottom water distributor pipe 14 extends out of the tank and is connected to the total water supply annular pipe network 3 through the water supply branch pipe 5. The cold release circulating water pump 2 is connected in parallel with the switching control valve 7 and then connected in series to the water supply branch pipe 5. By adopting the above technical solution, a top water distributor 11 and a top water distributor pipe 12 are installed on the top of the cold water storage tank 1. The top water distributor pipe 12 extends out of the tank and is connected to the total water return annular pipe network 4 through the return branch pipe 6. A bottom water distributor 13 and a bottom water distributor pipe 14 are installed at the bottom of the cold water storage tank 1. The bottom water distributor pipe 14 extends out of the tank and is connected to the total water supply annular pipe network 3 through the water supply branch pipe 5. The cold release circulating water pump 2 is connected in parallel with the switching control valve 7 to form a whole and then connected in series to the water supply branch pipe 5. The switching control valve 7 is used to switch the entire system between the two operating conditions of "source end" and "end", which can meet the requirements of the chilled water system to operate efficiently in both the normal cooling mode with high time frequency throughout the year and the occasional extreme hourly fault operation mode (i.e., uninterrupted charging and cooling) without destroying the cold storage temperature gradient, optimizing the operating conditions of the cold water system, and achieving the effect of energy saving and cost reduction.

[0018] Preferably, refer to Figure 1 In this embodiment, the cooling circulating water pump 2 is set to two groups (or multiple groups) connected in series on the water supply branch pipe 5 and VFD frequency conversion control is adopted. The first isolation valve 8 is provided on the side of the return water branch pipe 6 close to the total return water annular pipe network 4, and the second isolation valve 9 is provided on the side of the water supply branch pipe 5 close to the total water supply annular pipe network 3. By adopting the above technical solution, the two groups of cooling circulating water pumps 2 can be divided into main and standby, which improves the safety and stability of the system, and the settings of the first isolation valve 8 and the second isolation valve 9 meet the requirements of the design specifications.

[0019] Preferably, refer to Figure 1 In this embodiment, when the cold storage water tank 1 is in self-charging and cooling operation, the cold storage circulation flow direction 101 of the water system is as follows: the air-conditioning circulating water flows in from the water supply branch pipe 5 and flows out from the return branch pipe 6. In this mode, the switch control valve 7 is in the open state. When the cold storage water tank 1 is in external energy supply and cooling operation, the cold release circulation flow direction 102 of the water system is as follows: the air-conditioning circulating water flows in from the return branch pipe 6, flows out from the water supply branch pipe 5 and is pressurized by the cold release circulating water pump 2. In this mode, the switch control valve 7 is in the closed state.

[0020] Working principle: "Source-end" cooling release mode operating conditions: the first isolation valve 8 and the second isolation valve 9 are maintained in the open state, and the switching control valve 7 is maintained in the closed state. At this time, the system air-conditioning water of the total return water ring network 4 enters the top water distributor pipe 12 through the return water branch pipe 6, enters the vertical cold storage water tank 1 through the top water distributor 11, and then flows out through the bottom water distributor 13 and the bottom water distributor pipe 14 to return to the water supply branch pipe 5, and is pressurized by the cooling release circulating water pump 2 and supplied to the total water supply ring network 3.

[0021] The operating condition of the "end" cold storage mode: the first isolation valve 8 and the second isolation valve 9 are maintained in the open state, and the switching control valve 7 is maintained in the open state. At this time, the system air-conditioning water of the total water supply ring network 3 enters the bottom water distributor pipe 14 from the water supply branch pipe 5 (at this time, a one-way check valve is provided at the outlet of the cooling circulation water pump 2, the air-conditioning water is cut off, and the system air-conditioning water can only pass through the water supply branch pipe 5), enters the cold storage water tank 1 through the bottom water distributor 13, and then flows out through the top water distributor 11 and the top water distributor pipe 12 to return to the return branch pipe 6, and finally enters the total return water ring network 4.

[0022] The parameters of the embodiment of the utility model are designed as follows:

[0023] 1. The water system's total water supply annular pipe network 3 delivers medium- and high-temperature chilled water at 12-17°C, and the water system's total water return annular pipe network 4 delivers medium- and high-temperature chilled water at 18-25°C;

[0024] 2. The cooling circulation water pump 2 only bears the series circulation resistance of the cold storage water tank 1, the top water distributor 11, the top water distributor pipe 12, the bottom water distributor 13, the bottom water distributor pipe 14, the total water supply annular pipe network 3, the total return water annular pipe network 4, the cold storage water supply branch pipe 5, the cold storage return water branch pipe 6 and the end-user air conditioner during emergency uninterrupted cooling;

[0025] 3. The end water supply of medium-high temperature chilled water (user side) with a design temperature of 12~17℃ always enters or flows out from the bottom water distributor 13 of the vertical cold storage device, i.e. the cold storage water tank 1;

[0026] 4. The end return water of medium and high temperature chilled water (user side) with a design temperature of 18~25℃ always enters or flows out from the top water distributor 11 of the vertical cold storage device, that is, the cold water storage tank 1.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A source-end switchable bypass-type uninterrupted water energy storage system, characterized in that: The invention comprises a cold storage water tank (1), a cold release circulating water pump (2), a total water supply annular pipe network (3), a total return water annular pipe network (4), a water supply branch pipe (5), a return water branch pipe (6), and a switching control valve (7). The top of the cold storage water tank (1) is provided with a top water distributor (11) and a top water distributor pipe (12), and the bottom is provided with a bottom water distributor (13) and a bottom water distributor pipe (14). The top water distributor pipe (12) extends out of the tank and is connected to the total return water annular pipe network (4) through the return water branch pipe (6). The bottom water distributor pipe (14) extends out of the tank and is connected to the total water supply annular pipe network (3) through the water supply branch pipe (5). The cold release circulating water pump (2) is connected in parallel with the switching control valve (7) and then connected in series to the water supply branch pipe (5).

2. A source-end switchable bypass-type uninterrupted water energy storage system according to claim 1, characterized in that: The cooling-release circulating water pumps (2) are arranged in groups connected in parallel to the water supply branch pipes (5), and the working direction of the cooling-release circulating water pumps (2) is from the bottom water distributor (13) of the cold water storage tank (1) to the main water supply annular pipe network (3).

3. A source-end switchable bypass-type uninterruptible water energy storage system according to claim 1 or 2, characterized in that: When the cold storage water tank (1) is in self-charging and cooling operation, the cold storage circulation flow direction (101) of the water system is as follows: air conditioning circulating water flows in from the water supply branch pipe (5) and flows out from the return branch pipe (6). In this mode, the switch control valve (7) is in an open state.

4. A source-end switchable bypass-type uninterruptible water energy storage system according to claim 1 or 2, characterized in that: When the cold storage water tank (1) is in external energy supply and cooling operation, the water system cooling circulation flow direction (102) is as follows: air conditioning circulating water flows in from the return water branch pipe (6), flows out from the water supply branch pipe (5) and is pressurized by the cooling circulation water pump (2). In this mode, the switch control valve (7) is in the closed state.

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