CN201954691U - Series connection type refrigeration air-conditioner and tail end cold accumulation water system - Google Patents

Abstract

The utility model relates to a series connection type refrigeration air-conditioner and a tail end cold accumulation water system. The water system includes a single working condition refrigerator, a double working condition refrigerator, a heat exchanger, a cold accumulation device, a water pump, a valve and the like, which are connected through intermediate distribution pipes; through the series connection use of each refrigerating plant in a refrigerating system and the series connection use of different functional air-conditioner tail end water systems, the energy gradient utilization in an air-conditioner system is realized in a real way, the purposes of saving energy and lowering investment are achieved, the different functional air-conditioner tail end and parametric water supply requirements can be conveniently satisfied by only one water system, and the cold accumulation air-conditioner technology is combined to effectively utilize low-temperature cold water, greatly improve temperature difference of supply water and return water, and lower the energy consumption in conveying; and meanwhile, the refrigeration host machine capability is effectively reduced, the electrovalence difference of peak and valley in a power grid is fully utilized, the air-conditioner running cost is lower. The water system provided by the utility model not only meets the large temperature difference requirement of the system, but also correspondingly improves the refrigeration efficiency, lowers the initial investment of the system, improves the energy utilization efficiency and lowers the running energy consumption.

Description

A serial refrigeration air conditioner and terminal cold storage water system

technical field

The utility model relates to the technical field of air conditioning and refrigeration, in particular to a serial refrigeration air conditioner and a terminal cold storage water system.

Background technique

At present, there are mainly two forms of air treatment in the field of air conditioning: heat-humidity combined treatment and temperature-humidity independent treatment. The air-conditioning terminal equipment corresponding to these two air treatment forms requires different chilled water supply and return water temperatures. In order to meet the requirements of different terminal equipment in the air-conditioning area for water supply and return water temperature, there are two general methods at this stage:

1. The system is equipped with a set of water pipeline system, and the two types of terminal equipment are operated in parallel. The water supply temperature of the air-conditioning and refrigeration system adopts the treatment temperature required by conventional condensation dehumidification, generally 7°C. At the same time as the water supply temperature of the equipment, another type of sensible heat terminal equipment that only performs heat and temperature treatment provides cold water with a higher temperature, generally 13°C to 18°C, by setting an intermediate heat exchange or an end mixing water pump.

2. The system is equipped with two sets of water pipeline systems and air-conditioning and refrigeration systems to meet the different requirements of the above two types of air-conditioning terminal equipment for water supply temperature.

At present, the air-conditioning refrigeration system is usually a single-stage chiller system, and the cold storage air-conditioning system has a two-stage series system, that is, the ice storage tank is connected in series with the chiller, and very few conventional air-conditioning refrigeration systems also have a two-stage chiller series system.

For large-scale engineering projects with a certain distance between the refrigeration station and the air-conditioning terminal, the above-mentioned two types of air-conditioning terminal systems have disadvantages such as high initial investment, low cooling efficiency, or high energy consumption due to small temperature differences.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a series refrigeration air conditioner and terminal cold storage water system, which not only meets the requirement of large temperature difference in the system, but also improves the refrigeration efficiency accordingly, and reduces the initial cost of the system. Investment, but also improve the efficiency of energy utilization, reduce operating energy consumption.

In order to achieve the above object, the technical solution adopted by the utility model is:

A tandem refrigeration air conditioner and terminal cold storage water system, including a single-working condition cold machine 1, the output of the single-working condition cold machine 1 passes through the direct connection of the first three-way valve 11, the direct connection of the second three-way valve 12, and the cold storage device The first inlet pipeline of 4 is connected, and the first outlet of the cold storage device 4 passes through the air-conditioning water pump 8, the direct connection of the third three-way valve 13, the primary user 5, the direct connection of the fourth three-way valve 14, the secondary user 6, and the direct connection of the fourth three-way valve 14. The direct connection of the five-way three-way valve 15 is connected with the input pipeline of the single-working condition refrigerator 1, and the output of the double-working condition refrigerator 2 is connected through the first valve 9 and the input pipeline of the cold storage pipe 16 of the cold storage device 4, and the cold storage pipe 16 The output of the solution pump 7 is communicated with the input pipeline of the dual-working condition refrigerator 2, the first input of the heat exchanger 3 is communicated with the bypass of the first three-way valve 11, and the first output of the heat exchanger 3 is communicated with the first The pipeline connection between the direct connection of the three-way valve 11 and the direct connection of the second three-way valve 12, the second input of the heat exchanger 3 is through the connection between the second valve 10 and the first valve 9 and the double working condition refrigerator 2 The pipeline is connected, the second output of the heat exchanger 3 is connected with the pipeline between the cold storage device 4 and the solution pump 7, the first input and the first output of the heat exchanger 3 are a circuit, and the second output of the heat exchanger 3 The input and the second output are a circuit, the bypass of the second three-way valve 12 and the pipeline between the first output of the cold storage device 4 and the air-conditioning water pump 8 are connected, and the bypass of the third three-way valve 13 is connected with the primary user 5 The pipeline communication between the direct connection of the fourth three-way valve 14, the bypass of the fourth three-way valve 14 and the pipeline communication between the secondary user 6 and the direct connection of the fifth three-way valve 15, the fifth three-way The bypass of the valve 15 is communicated with the pipeline between the single working condition refrigerator 1 and the direct connection of the first three-way valve 11 .

The utility model has the following characteristics and beneficial effects:

)经济学优化的科学用能原理，通过制冷主机的多级串联制冷和空调末端设备的逐级用冷，在空调用户侧加大使用温差，即提高回水温度，在空调制冷侧加大供水温差，即降低供水温度，从而减少系统的水流量，使空调冷冻输配水系统的初投资降低，同时，降低水系统泵的输送能耗；(1) The utility model is based on (

) Economically optimized scientific energy utilization principle, through the multi-stage series refrigeration of the refrigeration main unit and the step-by-step cooling of the air-conditioning terminal equipment, the use temperature difference is increased on the air-conditioning user side, that is, the return water temperature is increased, and the water supply is increased on the air-conditioning refrigeration side Temperature difference, that is, to reduce the water supply temperature, thereby reducing the water flow of the system, reducing the initial investment of the air-conditioning refrigeration water transmission and distribution system, and at the same time reducing the transmission energy consumption of the water system pump;

(2) The increase of the return water temperature reduces the temperature difference between the chilled water and the environment, thereby reducing the cooling loss on the transmission and distribution pipeline. will become more apparent;

(3) The increase of the return water temperature also improves the performance coefficient COP of the single-working condition chiller 1, that is, the energy utilization efficiency is improved;

(4) Combining cold storage technology to effectively use low-temperature cold water, greatly increase the temperature difference between supply and return water, and reduce energy consumption for transportation; it can not only balance the peak and valley loads of the power grid, reduce the capacity of refrigeration hosts, and reduce the cost of power expansion of air conditioning systems and The cost of power supply and distribution facilities can be effectively utilized, and the peak and valley power price difference of the power grid can be effectively used to reduce the operating cost of air conditioning and refrigeration;

(5) The use of the system of the utility model makes the new energy-saving system that appears today—the temperature and humidity independent control system, more perfectly embodied.

Description of drawings

Accompanying drawing is the structural representation of the utility model.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings.

A tandem refrigeration air conditioner and terminal cold storage water system, including a single-working condition cold machine 1, the output of the single-working condition cold machine 1 passes through the direct connection of the first three-way valve 11, the direct connection of the second three-way valve 12, and the cold storage device The first inlet pipeline of 4 is connected, and the first outlet of the cold storage device 4 passes through the air-conditioning water pump 8, the direct connection of the third three-way valve 13, the primary user 5, the direct connection of the fourth three-way valve 14, the secondary user 6, and the direct connection of the fourth three-way valve 14. The direct connection of the five-way three-way valve 15 is connected with the input pipeline of the single-working condition refrigerator 1, and the output of the double-working condition refrigerator 2 is connected through the first valve 9 and the input pipeline of the cold storage pipe 16 of the cold storage device 4, and the cold storage pipe 16 The output of the solution pump 7 is communicated with the input pipeline of the dual-working condition refrigerator 2, the first input of the heat exchanger 3 is communicated with the bypass of the first three-way valve 11, and the first output of the heat exchanger 3 is communicated with the first The pipeline connection between the direct connection of the three-way valve 11 and the direct connection of the second three-way valve 12, the second input of the heat exchanger 3 is through the connection between the second valve 10 and the first valve 9 and the double working condition refrigerator 2 The pipeline is connected, the second output of the heat exchanger 3 is connected with the pipeline between the cold storage device 4 and the solution pump 7, the first input and the first output of the heat exchanger 3 are a circuit, and the second output of the heat exchanger 3 The input and the second output are a circuit, the bypass of the second three-way valve 12 and the pipeline between the first output of the cold storage device 4 and the air-conditioning water pump 8 are connected, and the bypass of the third three-way valve 13 is connected with the primary user 5 The pipeline communication between the direct connection of the fourth three-way valve 14, the bypass of the fourth three-way valve 14 and the pipeline communication between the secondary user 6 and the direct connection of the fifth three-way valve 15, the fifth three-way The bypass of the valve 15 is communicated with the pipeline between the single working condition refrigerator 1 and the direct connection of the first three-way valve 11 .

The working principle of the utility model is:

The system of the utility model has two main operation modes of daytime and nighttime (cold storage).

When the system is running in the daytime, single working condition chiller 1 and double working condition chiller 2, solution pump 7 and air conditioner water pump 8 are running, valve 9 is closed and valves 10-15 are opened; The cold machine 1 flows into the heat exchanger 3 after being cooled once, and the cooling capacity produced by the double-working condition cold machine 2 is cooled by the second stage, and then flows through the cold storage device 4 to be cooled by the third stage, and then pressurized by the air-conditioning water pump 8, sequentially It flows through the primary user 5 and the secondary user 6, and then returns to the single-working condition cooler 1 to enter the next cycle after cooling down step by step.

When the system is running at night, the dual-working condition refrigerator 2 and the solution pump 7 are running, the valve 10 is closed, the straight-through of the three-way valve 12 is closed, the bypass is opened, and the valves 11, 13, 14, and 15 are opened. The brine is generally B The glycol aqueous solution is pressurized by the solution pump 7 and enters the dual-working condition refrigerator 2 to absorb the cooling capacity of the refrigerant. After the temperature drops, it enters the cold storage device 4 through the valve 9 to release the cooling capacity, completing the cold storage process, and releasing the refrigerant of the cooling capacity. Return to the solution pump 7 and enter the next cycle; for the air-conditioning water circuit, the single-condition chiller 1 and the air-conditioning water pump 8 are running, and the air-conditioning return water with a higher water temperature is cooled by the single-working condition chiller 1 and then pressurized by the air-conditioning water pump 8 , flows through the primary user 5 and the secondary user 6 in sequence, and returns to the single-working condition refrigerator 1 to enter the next cycle after cooling down step by step.

In addition, there are local bypass pipes in single-working condition chiller 1, heat exchanger 3, cold storage device 4, primary user 5, and secondary user 6, and the bypass flow is controlled by their respective three-way valves to achieve system flow. Compatible and matching with the capacity of each equipment, a water mixing device can also be installed at the entrance of the end user to realize the compatibility of the system water supply temperature with the temperature required by the end equipment.

Claims (1)

1. A tandem refrigeration air conditioner and terminal cold storage water system, comprising a single-working condition cold machine (1), characterized in that: the output of the single-working condition cold machine (1) passes through the direct connection of the first three-way valve (11) in sequence 1. The straight-through of the second three-way valve (12) is connected with the first inlet pipeline of the cold storage device (4), and the first outlet of the cold storage device (4) passes through the air-conditioning water pump (8) and the third three-way valve (13) successively. straight-through of primary user (5), straight-through of the fourth three-way valve (14), secondary user (6), straight-through of fifth three-way valve (15) and input pipeline of single working condition cooler (1) Unicom, the output of the double-working condition cold machine (2) is connected through the input pipeline of the cold storage pipe (16) of the first valve (9) and the cold storage device (4), and the output of the cold storage pipe (16) is passed through the solution pump (7) The first input of the heat exchanger (3) is communicated with the bypass of the first three-way valve (11), and the first output of the heat exchanger (3) is connected with the input pipeline of the dual-working condition refrigerator (2). The pipeline communication between the through-through of the first three-way valve (11) and the through-through of the second three-way valve (12), the second input of the heat exchanger (3) passes through the second valve (10) and the first valve ( 9) The pipeline communication between the dual-working condition refrigerator (2), the second output of the heat exchanger (3) and the pipeline communication between the cold storage device (4) and the solution pump (7), the heat exchanger The first input and the first output of (3) are a loop, the second input and the second output of the heat exchanger (3) are a loop, and the bypass and cold storage device (4) of the second three-way valve (12) The pipeline communication between the first output of the air-conditioning water pump 8 and the bypass of the third three-way valve (13) and the pipeline communication between the primary user (5) and the direct connection of the fourth three-way valve (14), The pipeline connection between the bypass of the fourth three-way valve (14) and the secondary user (6) and the direct connection of the fifth three-way valve (15), the bypass and simplex of the fifth three-way valve (15) The pipeline between the condition cooler (1) and the straight-through of the first three-way valve (11) is communicated.

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