CN201259287Y - Cold storage air conditioner system for enhancing cold-storage density - Google Patents

Abstract

The utility model relates to a cold storage air-conditioning system with increased cold storage density, which includes a refrigeration unit, a cold storage device, a frozen water pump, an air conditioning unit, and a cooling water system. Water cooling lines. The utility model provides high-temperature frozen water as low-temperature cooling water to the condenser of the refrigeration unit for refrigeration, the condensation temperature is reduced, the efficiency of the refrigeration unit is improved, and the operating electricity cost of the air conditioner is reduced; the utility model uses it as low-temperature cooling water. The high-temperature chilled water is refrigerated by the evaporator of the refrigeration unit, and the evaporation temperature rises, which improves the efficiency of the refrigeration unit. The utility model is suitable for water cold storage or ice cold storage air-conditioning system, can reduce the power consumption in the peak period of electricity consumption more, reduce operating costs, increase the cold storage density, and has a positive effect on shifting peaks and filling valleys of the power grid.

Description

Cold Storage Air Conditioning System with Increased Cold Storage Density

technical field

The utility model relates to a cold storage air conditioning system.

Background technique

Since the reform and opening up, the electric power industry, as one of the basic industries of the national economy, has achieved considerable development. However, the growth of electricity still cannot meet the needs of the rapid development of the national economy and the sharp increase in people's daily electricity consumption. The situation of power shortage in the country still exists, the load rate of the power grid is low, the peak-valley difference of the system is increased, and the peak power is seriously insufficient, resulting in frequent power grids. Pull the grid and cut power. Effectively transfer the electricity from the peak period to the trough period, so that the power consumption of the entire power grid is more uniform, which can reduce the planned capacity of the power grid and save huge investment in power infrastructure. It is an important way to alleviate power construction and effectively use the power grid.

In terms of building energy consumption, due to the increasing power consumption of air-conditioning and cooling, which overlaps with the peak power consumption of the power grid, it leads to insufficient power consumption during the peak power consumption period in summer in my country, and the power grid is limited. important reason to run.

In 2004, the National Development and Reform Commission and the Electricity Regulatory Commission jointly issued the "Guiding Opinions on Strengthening Power Demand-Side Management".

Air-conditioning cold storage technology is to store the cold energy in the cold storage tank during the off-peak power time, and release the cold energy during the peak time to meet the needs of building air conditioning or production processes. Compared with conventional air conditioning systems, it has the following advantages:

(1) By shifting the running time of refrigeration equipment, cold storage air conditioners make full use of nighttime power and reduce peak power consumption, which has become the most potential way to shift peak power and fill valleys, with both economic and equipment benefits.

(2) Make the equipment run at a high efficiency point, avoiding the change of the main engine with the change of the air conditioner load, reducing the efficiency of the main engine, saving the operating power of the air conditioner, improving the operating safety of the main engine, and prolonging the service life of the main engine .

(3) Reduced installation capacity of air-conditioning cold and heat source equipment. Save the initial investment.

(4) As a backup cold and heat source, it can meet the air-conditioning requirements of the building when the power supply is insufficient. For process cold air conditioners, it avoids the occurrence of unqualified equipment caused by the sudden shutdown of the air conditioner.

(5) For cooling towers or air-cooled heat pumps, due to the low ambient temperature at night, the condensing temperature drops, and the coefficient of performance (COP) of the refrigeration unit increases, saving operating costs.

There are two types of cold storage air conditioning systems commonly used today:

1. Water cold storage form: For example, a water cold storage air-conditioning system shown in Figure 1, which includes chiller 11, cold storage equipment, chilled water pump 12, air conditioning unit 13, cooling water pump 15 and cooling tower 14, cold storage equipment includes low-temperature frozen water Cool storage tank 17 and high temperature chilled water cool storage tank 18, the water supply pipe of the air conditioning unit 13 is connected to the low temperature chilled water cool storage tank 17, the return water pipe of the air conditioning unit 13 is connected to the high temperature chilled water cool storage tank 18, and the chilled water pump 12 is located in the air conditioning unit On the water supply pipe of 13, a high-temperature chilled water cooling pipeline is provided between the high-temperature chilled water cold storage tank 18 and the low-temperature chilled water cold storage tank 17, passing through the chiller evaporator 111, and between the high-temperature chilled water cold storage tank 18 and the chiller evaporator 111 A chilled water circulation pump 16 is provided between the water inlets of the chiller, the water inlet and outlet of the condenser 112 of the chiller are connected to the cooling tower 14 through pipes, and the cooling water pump 14 is located between the water inlet of the condenser 112 and the cooling tower 14 between. The advantages of water storage system are low initial investment, simple structure and convenient management. The disadvantage is that the cold storage density is low and the space required is relatively large.

2. Ice cold storage form: the advantage is that the cold storage density is relatively high and the space required is small, but its disadvantages are that its initial investment is high, the structure is complicated, and the maintenance and management are complicated.

The operation plan of the conventional cold storage air conditioning system is: during the low peak period of electricity consumption, the high temperature chilled water in the cold storage equipment is turned into low temperature chilled water or ice, and the low temperature chilled water or ice is used as the cooling load of the air conditioning unit during the peak period of electricity consumption Turn into high-temperature chilled water. When the cooling load of the air conditioner is higher than the cooling load that the cold storage equipment can store, it is necessary to turn on the cooling tower and the refrigeration unit to provide the cooling load to the air conditioning unit.

Contents of the invention

The purpose of the utility model is to provide a cold storage air-conditioning system with increased cold storage density, which can reduce initial investment, increase cold storage density and refrigeration efficiency.

The purpose of this utility model is achieved in this way: the cold storage air conditioning system of this utility model includes a refrigeration unit, a cold storage device, a chilled water pump, an air conditioning unit, and a cooling water system. The cooling water circulation pipeline is composed of pipes connecting the cold storage equipment and the condenser of the refrigeration unit, and the condenser and the cold storage equipment in sequence, and a low-temperature cooling water circulation pump is installed on the water supply pipe of the condenser; there are also 2 to several high-temperature chilled water Refrigeration pipeline, each high-temperature chilled water refrigeration pipeline is connected by pipes between chilled water of different temperatures in the cold storage equipment and passes through the evaporator of the refrigeration unit, and a high-temperature chilled water circulation pump is installed on the water supply pipe of the evaporator; Electric control valves are installed on each of the above-mentioned pipelines, and a temperature control switch is installed on the condenser water supply pipe of the low-temperature cooling water circulation pipeline to ensure that the inlet water temperature of the condenser meets the cooling water inlet temperature requirements of the refrigeration unit; The evaporator water supply pipe of the water cooling pipeline is provided with a temperature control switch to ensure that the inlet water temperature of the evaporator meets the requirements of the chilled water inlet temperature of the refrigeration unit.

The cold-storage air-conditioning system of the utility model can be a water-storage or ice-storage air-conditioning system.

As a better solution, the cold storage equipment in the utility model includes a large cold storage tank, and vertical diaphragms are arranged in the large cold storage tank to form two to several small cold storage tanks, and frozen water of different temperatures is stored in different small cold storage tanks .

The refrigerating unit in the utility model can be one or more.

The heat exchange device of the cooling water system in the utility model can be a cooling tower or lake water or soil.

Principle of the present utility model is as follows:

As we all know, for the refrigeration unit, the efficiency of the refrigeration unit will increase by reducing the condensation temperature (cooling water temperature) or increasing the evaporation temperature (the temperature of the chilled water entering the evaporator). Some data show that the cooling water temperature is lowered, and the efficiency of the refrigeration unit can be increased by about 50% to 60%.

The utility model is provided with 1 to several low-temperature cooling water circulation pipelines, which can operate when the refrigeration unit is turned on in the cooling stage, and provide high-temperature frozen water as low-temperature cooling water to the condenser of the refrigeration unit for refrigeration. The temperature is much lower than that of conventional cooling water, the condensation temperature is lowered, and the efficiency of the refrigeration unit is improved. At the same time, there is no need to open the cooling water system. Since there is no need to open cooling towers and other power-consuming heat exchange devices, the operating electricity cost of the air conditioner is reduced. After cooling by the refrigeration unit, the temperature of the high-temperature chilled water continues to rise as the low-temperature cooling water.

The utility model is also equipped with 2 to several high-temperature frozen water refrigeration pipelines, which can operate when cold storage is required, and reduce the cooling temperature of the high-temperature frozen water through the evaporator of the refrigeration unit, and finally become low-temperature frozen water or ice storage. The high temperature of high temperature chilled water increases the evaporation temperature, which improves the efficiency of the refrigeration unit, especially at night when the electricity consumption is low, the outdoor temperature is low, and the temperature of the cooling water passing through the cooling tower is lower than that of the cooling water passing through the cooling tower during the day , also improves unit efficiency.

It can be seen from the above that the technical effect of the utility model is that the utility model can increase the temperature difference of the chilled water in the cold storage equipment (20 degrees or even higher than the conventional water storage air conditioner), reduce the capacity of the cold storage equipment, and reduce the initial investment ; Compared with the conventional cold storage system, the utility model reduces the electricity consumption in the peak period of electricity consumption, reduces the operation cost, and increases the cold storage density. The utility model has a positive effect on shifting peaks and filling valleys of the power grid.

Description of drawings

Fig. 1 is a structural diagram of an existing water cold storage air conditioning system.

Fig. 2 is a structural diagram of the utility model embodiment.

Fig. 3 is a schematic diagram of the operation of the embodiment in the cooling stage.

Fig. 4 is a schematic diagram of the operation of the embodiment in the stage of using high-temperature chilled water as low-temperature cooling water.

Fig. 5 and Fig. 6 are schematic diagrams of the operation of the embodiment in the cold storage stage.

Detailed ways

In this embodiment, the maximum inlet temperature of chilled water is set at 17°C, and the minimum inlet temperature of cooling water is set at 17°C. The temperature can be set according to the specific conditions and requirements of the system.

Referring to Figure 2, this embodiment includes a refrigeration unit 1, a high-temperature chilled water circulation pump 2, a chilled water pump 3, an air-conditioning unit 4, a cooling tower 5, a low-temperature cooling water circulation pump 6, a cooling water pump 7, a cold storage tank 8, a cold storage tank 9, and a cold storage tank 10; the refrigerating unit 1 includes an evaporator 101 and a condenser 102; the cold storage tank 8 to 10 is formed by a large cold storage tank with a vertical diaphragm, the cold storage tank 8 is a low-temperature frozen water storage tank, the cold storage tank 9, the cold storage tank Tank 10 is a high-temperature chilled water storage tank, which stores high-temperature chilled water at different temperatures. An electric regulating valve is provided at each water inlet and outlet of cold storage tanks 8, 9, and 10, which are electric regulating valves K1 and K2. , K3, K4, K5, K6, K7, K8.

Referring to Fig. 2 to Fig. 6, the present embodiment is provided with following pipelines:

1. Low temperature chilled water cooling pipeline:

The cold storage tank 8 is connected with the water supply pipe of the air conditioning unit 4 , the return pipe of the air conditioning unit 4 is connected with the cold storage tank 9 , and the chilled water pump 3 is arranged on the water supply pipe of the air conditioning unit 4 .

A bypass pipe L2 is provided between the water supply and return pipes of the air conditioning unit 4, and an electric regulating valve K11 is provided on the bypass pipe L2. An electric control valve K10 and a temperature control switch T2 are provided on the water supply pipeline of the air conditioning unit 4 to adjust the flow rate according to the temperature to ensure a constant supply water temperature.

2. Low temperature cooling water circulation pipeline:

The cold storage tank 9 is connected to the water inlet end of the condenser 102 of the refrigeration unit through the low-temperature cooling water supply pipe L1, and the water outlet end of the condenser 102 is connected to the cold storage tank 10 through the low-temperature cooling water return pipe. A bypass pipe L5 is provided between the low-temperature cooling water supply pipe L1 and the low-temperature cooling water return pipe, and an electric regulating valve K9 is provided on the bypass pipe L5. Set the temperature control switch T1 on the low-temperature cooling water supply pipe L1 to control the electric control valves K3 and K9 to ensure that the water inlet temperature of the condenser 102 of the refrigeration unit meets the minimum cooling water inlet temperature of 17 degrees for the cooling water of the refrigeration unit 1. The high-temperature chilled water in the cold storage tank 9 passes through the condenser 102 of the refrigerating unit and becomes higher-temperature high-temperature chilled water and flows into the cold storage tank 10 .

In this embodiment, only one low-temperature cooling water circulation pipeline is provided. The utility model can also provide more such as two or several low-temperature cooling water circulation pipelines. For example, the high-temperature frozen water in the cold storage tank 10 can also be used as low-temperature cooling water. Provided to the condenser 102 of the refrigeration unit, the high-temperature chilled water whose temperature is further increased is used as low-temperature cooling water... until the temperature of the high-temperature chilled water rises to be equal to or close to the temperature of conventional cooling water.

3. High temperature chilled water refrigeration pipeline:

The high-temperature chilled water refrigeration pipeline includes two:

(1) The cold storage tank 10 is connected in series with the high-temperature chilled water circulating pump 2 through pipelines, and then connected to the water inlet end of the refrigerating unit evaporator 101, and the water outlet end of the refrigerating unit evaporator 101 is connected to the cold storage tank 9 through pipelines. A bypass pipeline L6 and an electric regulating valve K5 are also provided beside the above-mentioned pipeline, and a temperature control switch T3 is set on the pipeline between the cold storage tank 10 and the evaporator 101 of the refrigeration unit to control the electric regulating valves K4 and K5 to ensure The inlet water temperature of the evaporator 101 of the refrigeration unit meets the maximum cooling inlet water temperature of the chilled water of the refrigeration unit 1 (set to 17 degrees in this embodiment).

(2) The cold storage tank 9 is connected in series with the high-temperature chilled water circulation pump 2 through pipelines and then connected to the water inlet end of the refrigerating unit evaporator 101, and the water outlet end of the refrigerating unit evaporator 101 is connected to the cold storage tank 8 through pipelines.

The number of high-temperature chilled water cooling pipes is related to the number of low-temperature cooling water circulation pipes. When the number of low-temperature cooling water circulation pipes is larger, more high-temperature chilled water refrigeration pipes need to be installed because the maximum temperature of high-temperature chilled water is higher. Only through the road can the high-temperature frozen water finally become low-temperature frozen water.

In the above-mentioned two high-temperature chilled water cooling pipelines, the outlet end of the evaporator 101 of the refrigeration unit is connected to the cold storage tank 8 and the cold storage tank 9 respectively through the chilled water pipe L4, and the temperature control switch T4 is set on the chilled water pipe L4 to control the electric Regulate the opening of valves K6 and K7.

4. Cooling water circulation pipeline:

The water inlet and outlet of the condenser 102 of the refrigerating unit are connected to the cooling tower 5 through pipes, and the cooling water pump 7 is arranged between the water inlet of the condenser 102 and the cooling tower 5, and is installed on the two water supply pipes of the condenser 102 Electric regulating valves K12, K13, electric regulating valves K14, K15 are arranged on the two water outlet pipes, and the switching of the cooling water system and the low-temperature cooling water circulation pipeline is performed through their switches.

Among the above-mentioned pipelines, the (2) and the 4th pipelines in the 1st and 3rd are existing pipelines in the cold storage air-conditioning system, and the (1) pipelines in the 2nd and 3rd are the pipelines of the present utility model. Unique.

This embodiment can run as follows:

1. At the beginning, the cold storage tank 8 is filled with low-temperature chilled water (7 degrees in this embodiment), which fills the entire cold storage tank 8 .

2. Cooling stage of the cold storage tank: see Figure 3. During the peak period of power consumption, the chilled water pump 3 is turned on, and the electric control valves K1 and K8 are turned on. The low-temperature chilled water becomes high-temperature chilled water through the chilled water pump 3 and the air conditioning unit 4 (this implementation Example is set to 12 degrees) back in the cold storage tank 9, the electric regulating valves K10, K11 adjust the chilled water inlet flow according to the temperature control switch T2. During this process, the refrigeration unit 1 and the cooling tower 5 do not operate.

3. High temperature chilled water as low temperature cooling water stage:

Referring to Figure 4, turn on the refrigeration unit 1, chilled water pump 3, high-temperature chilled water circulation pump 2, and low-temperature cooling water circulation pump 6, open the electric control valves k13 and k14, close the electric control valves K12 and K15, and adjust the electric control valves according to the temperature control switch T1 The size of K3 and K9 ensures that the low-temperature cooling water reaches the minimum temperature requirement of the cooling water of the condenser 102 of the refrigeration unit (17 degrees in this embodiment). The high-temperature chilled water in the cold storage tank 9 is divided into two parts:

(1) Part of the high-temperature chilled water (12 degrees) passes through the evaporator 101 of the refrigeration unit to become low-temperature chilled water (7 degrees) and then enters the cold storage tank 8 to provide cooling load for the air-conditioning unit 4 .

(2) Part of the high-temperature chilled water (12 degrees) is regarded as low-temperature cooling water, and the flow rate of the electric control valves K3 and K9 is adjusted through the temperature control switch T1, and the minimum temperature (17 degrees) allowed by the condenser 102 of the refrigeration unit passes through the refrigeration unit The temperature of the condenser 102 continues to rise, and the high-temperature frozen water of 22 degrees enters the cold storage tank 10 .

Above-mentioned process is constantly circulated, until the frozen water in the cold storage tank 8 all becomes the high-temperature frozen water of 22 degrees.

4. Cold storage stage:

During the period of low power consumption, turn on the refrigeration unit 1, the high-temperature chilled water circulation pump 2, the cooling tower 5, and the cooling water pump 7, close the electric control valves K13 and K14, and open the electric control valves K12 and K13. The cold storage stage is divided into two steps:

(1) Referring to Fig. 5, the high-temperature chilled water at 22 degrees in the cold storage tank 10 is adjusted by the temperature control switch T3 to adjust the electric control valves K4 and K5 to ensure that the high-temperature chilled water reaches the maximum temperature (17 degrees) that the evaporator 101 of the refrigeration unit can allow The refrigerating unit 1 becomes 12-degree chilled water, the electric control valve K7 is opened by the temperature control switch T4, the electric control valve K6 is closed, and the 12-degree chilled water enters the cold storage tank 9. The frozen water until 22 degrees all becomes 12 degrees.

(2) Referring to Figure 6, the 12-degree high-temperature chilled water in the cold storage tank 9 passes through the refrigeration unit 1 to become 7-degree low-temperature chilled water, the electric control valve K7 is closed by the temperature switch T4, and the electric control valve K6 is opened at 7 degrees The low-temperature frozen water enters the cold storage tank 8 until all the high-temperature frozen water in the cold storage tank 9 becomes 7 degrees of low-temperature frozen water and is stored in the cold storage tank 8. The cold storage process is over.

In addition to the above-mentioned embodiments, there may be various changes under the concept of the present utility model, and these changes are all included in the protection scope of the present utility model.

Claims (3)

1. A cold-storage air-conditioning system that improves the cold-storage density, comprising a refrigerating unit, a cold-storage device, a chilled water pump, an air-conditioning unit, and a cooling water system, characterized in that: it is also provided with 1 to several low-temperature cooling water circulation pipelines, each of which is cooled by a low temperature The water circulation pipeline is composed of pipes connecting the cold storage equipment and the condenser of the refrigeration unit, and the condenser and the cold storage equipment in sequence, and a low-temperature cooling water circulation pump is installed on the water supply pipe of the condenser; there are also 2 to several high-temperature chilled water refrigeration units Pipeline, each high-temperature chilled water refrigeration pipeline is connected by pipelines between chilled water of different temperatures in the cold storage equipment and passes through the evaporator of the refrigeration unit, and a high-temperature chilled water circulation pump is arranged on the water supply pipe of the evaporator; Each of the above-mentioned pipelines is equipped with an electric regulating valve, and a temperature control switch is installed on the condenser water supply pipe of the low-temperature cooling water circulation pipeline to ensure that the inlet water temperature of the condenser meets the cooling water inlet temperature requirements of the refrigeration unit; The evaporator water supply pipe of the refrigeration pipeline is provided with a temperature control switch to ensure that the inlet water temperature of the evaporator meets the requirements of the chilled water inlet temperature of the refrigeration unit. 2. The cold storage air-conditioning system for increasing cold storage density according to claim 1, characterized in that: said cold storage equipment includes a large cold storage tank, and vertical diaphragms are arranged in the large cold storage tank to form two to several small cold storage tanks, different The chilled water at different temperatures is stored in different small cold storage tanks. 3. The cold storage air-conditioning system with increased cold storage density according to claim 1 or 2, characterized in that there are one or more chillers.

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