CN103476228A - Closed type composite cooling system - Google Patents

Abstract

The invention discloses a closed compound cooling system, which comprises a cooled device, an air cooler and a cooling water pump connected into a circulation loop through pipelines, and the system also includes a first plate heat exchanger, a second plate heat exchanger, Chiller, cold storage tank, buffer tank, first cold pump, second cold pump; the hot side of the first plate heat exchanger and the hot side of the second plate heat exchanger are connected in series in the circulation loop; the first cold pump, chiller, The cold storage tank and the buffer tank form the cold storage circuit; the first cold pump, the chiller, the cold side of the first plate heat exchanger and the buffer tank form the first cooling release circuit; the second cold pump, the cold storage tank and the second plate heat exchanger The side forms the second cooling circuit. The design temperature of the closed composite cooling system of the present invention can be significantly lower than the local limit temperature, and the structure is compact, which reduces the consumption of the air heat exchanger, fully utilizes the design capacity of the air cooler, reduces the cost, and makes the closed The application area of the circulating pure water cooling system has been expanded.

Description

A Closed Composite Cooling System

technical field

The invention relates to a closed compound cooling system. the

Background technique

The current high-power power electronic device cooling circulating water system usually adopts the air-cooling method of a closed circulation system and a radiator for heat dissipation. Specifically, the heat brought out by the circulating water is transferred to the air cooler, and at the same time, the peripheral fan blows the heat away with the wind. However, the circulating water temperature changes with the ambient temperature. On the one hand, as the ambient temperature changes, the circulating water also changes periodically. From the point of view of the design temperature, it is basically determined by the peak temperature point that occurs locally. In fact, the temperature in various places varies greatly, and this method can only be applied to environments where the temperature difference does not change much. If in an environment with a large temperature range, for example, in some water-deficient and arid regions near the equator, the temperature range between day and night is 5-45°C, so it is not enough to rely on air cooling to cool the circulating water. In addition, due to the small temperature difference of the air cooler, the efficiency of the radiator is low. Therefore, in the workplace, a very large group of air coolers can often be seen. Due to the large number of air coolers, the pipeline pressure ratio has become a troublesome technology problem. On the other hand, the water-cooling system is a device without cold storage. The system has a small heat capacity and is highly sensitive to the climate. When the temperature of the system rises too fast, the time from alarm to trip is short, and a trip accident will occur. the

The design scheme of the design temperature of the general water cooling system: design the temperature difference according to the limit temperature of the environment and the temperature of the cooling object, according to the weather conditions of the day when the limit temperature t2 occurs, and the temperature of the cooling object t3, assuming that the design temperature difference of the original heat dissipation equipment is Δt1, design the limit temperature of the environment is t2, then Δt1= t3 - t2. In fact, when the power is high, a large number of air coolers are required to adopt the environmental limit temperature, which not only occupies land but also has defects such as fluid resistance and proportioning. From the perspective of heat transfer, simply increasing the heat exchange area can indeed provide greater power dissipation capacity; if the temperature difference is increased, the air cooler will be reduced at the same power. The design ambient temperature is t1, then the design temperature difference is Δt2= t3 – t1>Δt1. When Δt2 is twice of Δt1, nearly half of the air cooler can be saved. The temperature difference between the design temperature and the environmental limit temperature is not very long in each year, so it can be solved by using heat pump or refrigeration when the temperature is low at night. the

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a closed compound cooling system. The consumption of the heat exchanger is small, thereby reducing the cost and expanding the application area of the closed circulation pure water cooling system. the

The purpose of the present invention is achieved through the following technical solutions:

A closed composite cooling system, including cooled components connected into a circulation loop through pipelines, an air cooler and a cooling water pump, the system also includes a first plate heat exchanger, a second plate heat exchanger, a water chiller, a cold storage Tank, buffer tank, first cold pump, second cold pump;

The hot side of the first plate heat exchanger and the hot side of the second plate heat exchanger are connected in series in the circulation loop;

The first cold pump, water chiller, cold storage tank and buffer tank form a cold storage circuit;

The first cold pump, the chiller, the cold side of the first plate heat exchanger and the buffer tank form the first cooling circuit;

The second cooling pump, the cold storage tank and the cold side of the second plate heat exchanger form a second cooling circuit. the

In order to better realize the present invention, the circulation loop is connected in parallel with a first bypass valve, so that the cooling medium in the circulation loop can directly return to the water-cooling inlet without passing through the first plate heat exchanger and the second plate heat exchanger. the

In order to better realize the present invention, valves are all provided in the cold storage circuit, the first cooling circuit and the second cooling circuit. the

In order to better realize the present invention, the first cooling circuit is connected in parallel with a second bypass valve, and the flow of the first cooling circuit is adjusted through the second bypass valve. the

In order to better realize the present invention, a first temperature detection device is provided behind the first plate heat exchanger, and a second temperature detection device is provided behind the second plate heat exchanger. the

In order to better realize the present invention, the flow rate of the first cooling circuit is adjusted according to the temperature detected by the first temperature detection device; the flow rate of the second cooling circuit is adjusted according to the temperature measured by the second temperature detection device. the

In order to better realize the present invention, the first cold pump is fixed frequency, and the second cold pump is variable frequency. the

In order to better realize the present invention, the cold storage tank is a thermocline type cold storage tank. the

Compared with the prior art, the present invention has the following advantages and beneficial effects:

The traditional closed circulating water cooling system is based on the design of the air cooler at the extreme temperature of the place, so it is bulky and expensive. In fact, many air coolers are idle for most of the year; the design temperature of the closed composite cooling system can be Obviously lower than the limit temperature of the place, compact structure, reducing the amount of air heat exchanger, making full use of the design capacity of the air cooler, reducing the cost, and at the same time, there is a cold reserve, so that when the heat is insufficient, the alarm process There is a certain processing time, so that the closed circulating water cooling system can be applied in the environment where the limit temperature is higher than 45°C. the

Description of drawings

Fig. 1 is a closed composite cooling system according to an embodiment of the present invention. the

Detailed ways

Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto. the

Example 1

As shown in Figure 1, a closed composite cooling system includes a cooled device 1, an air cooler 2, a first plate heat exchanger 3, a second plate heat exchanger 4, a first chiller 5, a second chiller Unit 6, the first cold pump (fixed frequency) 7, buffer tank 8, inclined temperature layer cold storage tank 9, the second cold pump (frequency conversion) 10, cooling water pump 11;

The cooled device 1, air cooler 2, valve K1, first plate heat exchanger 3, second plate heat exchanger 4 and cooling water pump 11 are sequentially connected to form a circulation loop, and the circulation loop is connected in parallel with a first bypass valve K2 ;

The hot side of the first plate heat exchanger 3 and the hot side of the second plate heat exchanger 4 are connected in series in the circulation loop;

The first chiller 5, the second chiller 6, the first cold pump (fixed frequency) 7, the buffer tank 8, the valve V1, the ramp type cold storage tank 9 and the valve V3 are sequentially connected in series to form a cold storage circuit;

The cold side of the first plate heat exchanger 3, the valve V4, the first water chiller 5, the second water chiller 6, the first cold pump (fixed frequency) 7, and the buffer tank 8 are sequentially connected in series to form the first cooling circuit. A second bypass valve V5 is connected in parallel in the cooling circuit;

The cold side of the second plate heat exchanger 4, the valve V2, the ramp type cold storage tank 9, and the second cold pump (frequency conversion) 10 form the second cooling circuit;

A first temperature detection device T1 is provided behind the first plate heat exchanger 3, and a second temperature detection device T2 is provided behind the second plate heat exchanger 4;

The flow rate of the first cooling circuit is adjusted according to the temperature detected by the first temperature detection device T1; the flow rate of the second cooling circuit is adjusted according to the temperature measured by the second temperature detection device T2. the

When 5°C ≤ ambient temperature ≤ 35°C, the entire flow of cooling water is bypassed from the first bypass valve K2, and K1 is closed; the pressure loss of the cooling water pump 11 is reduced. the

When the ambient temperature is less than or equal to 5°C, 1/2 of the flow of cooling water bypasses the first bypass valve K2, and 1/2 of the flow flows into K1 for heat exchange. Neither the first chiller 5 nor the second chiller 6 Work, start the first cold pump (fixed frequency) 7 and the second cold pump (variable frequency) 10, so that the frozen water does not freeze. the

When the ambient temperature is ≥35°C, 2/3 of the flow of cooling water is bypassed from the first bypass valve K2, and 1/3 of the flow flows into K1 for heat exchange, and chilled water is used for cooling to reduce the cooling water to the required temperature. the

(1) Cold storage in the cold storage tank at night: V5, V4, V2, the second cooling pump (frequency conversion) 10 are turned off, and when the water temperature of the inclined-thermothermal storage tank reaches 7°C, V3, the first chiller 5, and the second chiller 6 , The first cold pump 7 (fixed frequency), V1 is turned on, and the cold storage is over. the

(2) During the day, the chiller supplies cooling alone: V3, V2, V1, and the second cooling pump (frequency conversion) 10 are turned off, V4, the first chiller unit 5, the second chiller unit 6, and the first cooling pump (fixed frequency) 7 On, during the cooling process, V5 adjusts the flow rate of the first cooling circuit according to the temperature measured by the first temperature detection device T1. the

The first chiller 5 and the second chiller 6 are automatically unloaded according to the return water temperature respectively. the

The water temperature at the outlet of the cold side of the first plate heat exchanger 3 is 20°C. When the first chiller 5 and the second chiller 6 are at maximum load, the chilled water in the first release cooling circuit drops to 7°C. the

(3) Cooling storage tank alone for cooling: the first chiller 5, the second chiller 6, the first cold pump (fixed frequency) 7, V1, V3, V4, V5 closed, V2 and the second cold pump (frequency conversion) 10 On, according to the second temperature detection device T2, the frequency conversion control of the second cold pump (frequency conversion) 10 is carried out to meet the requirement of controlling the flow rate of the second cooling circuit. the

(4) Combined cooling: V1 and V3 are closed;

Cold storage tank cooling: V2 is turned on, and the second cold pump (frequency conversion) 10 is controlled by frequency conversion according to the temperature measured by the second temperature detection device T2, so as to meet the requirement of controlling the flow rate of the second cooling circuit. the

Cooling machine cooling: the first chiller 5 and the second chiller 6 are automatically unloaded according to the return water temperature. the

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention. the

Claims (8)

1. an enclosed composite cooling system, comprise the device that is cooled, aerial cooler and the cooling water pump that connect into circulation circuit by pipeline, it is characterized in that: described system also comprises the first plate heat exchanger, the second plate heat exchanger, handpiece Water Chilling Units, cold-storage groove, surge tank, the first cold pump, the second cold pump;

The hot side of described the first plate heat exchanger and the hot side of the second plate heat exchanger are connected in circulation circuit;

The described first cold pump, handpiece Water Chilling Units, cold-storage groove and surge tank form the cold-storage loop;

The described first cold pump, handpiece Water Chilling Units, the first plate heat exchanger cold side and surge tank form first and release cold loop;

The described second cold pump, cold-storage groove and the second plate heat exchanger cold side form second and release cold loop.

2. a kind of enclosed composite cooling system according to claim 1, it is characterized in that: described circulation circuit is parallel with the first bypass valve.

3. a kind of enclosed composite cooling system according to claim 1 is characterized in that: described cold-storage loop, first is released cold loop and second and is released in cold loop and be equipped with valve.

4. a kind of enclosed composite cooling system according to claim 1, it is characterized in that: described first releases cold loop is parallel with the second bypass valve.

5. a kind of enclosed composite cooling system according to claim 1, is characterized in that: be provided with the first temperature-detecting device after described the first plate heat exchanger, be provided with the second temperature-detecting device after the second plate heat exchanger.

6. a kind of enclosed composite cooling system according to claim 1, is characterized in that: the adjustment that the first flow of releasing cold loop is measured according to the first temperature-detecting device; The adjustment that the second flow of releasing cold loop is measured according to the second temperature-detecting device.

7. a kind of enclosed composite cooling system according to claim 1 is characterized in that: the described first cold pump is for frequently fixed, and the second cold pump is frequency conversion.

8. a kind of enclosed composite cooling system according to claim 1, it is characterized in that: described cold-storage groove is mesolimnion formula cold-storage groove.

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