A high efficiency ice storage system

Abstract

The application relates to the refrigeration technical field and provides a high-efficiency ice storage system, which comprises a compressor, the bottom of the compressor is connected with an ice storage tank, the top of the compressor is connected with an evaporative condenser, the evaporative condenser is communicated with one end of the ice storage tank, and the compressor and the evaporative condenser form a ring circuit; the ice storage tank comprises a plurality of ice storage coil pipes, the bottom of the ice storage tank is connected with a plate heat exchanger at both ends, and an ice melting pump is arranged on the plate heat exchanger; an evaporator; the evaporator is arranged on one side of the compressor, and the evaporator is connected with the compressor and the evaporative condenser at both ends; an air conditioner terminal device; the air conditioner terminal device comprises a ring circuit, a freezing pump is connected to the air conditioner terminal device, and the ring circuit of the air conditioner terminal device is connected with the evaporator. The ice storage system adopts a condenser+cooling water pump+cooling tower mode on the source side, which increases the conveying energy consumption on one hand and increases the condensing temperature and reduces the refrigeration efficiency due to multiple heat exchanges on the other hand.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a high-efficiency ice storage system. Background Technology

[0002] Energy storage air conditioning technology stores cooling or heating energy during off-peak hours at night and releases it during peak hours during the day. This can balance the grid load and allow users to save on air conditioning operating costs by taking advantage of the peak-valley electricity price difference. It has been increasingly widely used in large central air conditioning systems.

[0003] The existing ice storage system uses ethylene glycol as a refrigerant during cooling. Cooling requires secondary heat exchange via ethylene glycol-water plate heat exchangers to deliver the cooling capacity to the terminal. On the one hand, the two pumping operations increase the energy consumption for cooling capacity delivery. On the other hand, the heat exchange via plate heat exchangers leads to a loss of cooling capacity quality and reduces cooling efficiency.

[0004] When storing ice in an ice storage system, ethylene glycol is used as the refrigerant. The cooling capacity is first transferred from the refrigerant to the ethylene glycol, and then from the ethylene glycol to the ice storage tank. On the one hand, this increases the energy consumption of the ethylene glycol pump. On the other hand, the two transfers of cooling capacity reduce the quality of the cooling capacity and reduce the refrigeration efficiency.

[0005] The ice storage system uses a condenser + cooling water pump + cooling tower mode on the source side. On the one hand, this increases the energy consumption of the transmission, and on the other hand, the multiple heat exchanges increase the condensing temperature and reduce the refrigeration efficiency. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] The purpose of this invention is to provide a high-efficiency ice storage system to solve the problems of existing ice storage systems that use a condenser + cooling water pump + cooling tower mode on the source side, which increases energy consumption during transportation and increases condensation temperature and reduces refrigeration efficiency due to multiple heat exchanges. (II) Summary of the Invention

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-efficiency ice storage system, including a compressor, wherein the bottom of the compressor is connected to an ice storage tank and the top of the compressor is connected to an evaporative condenser, wherein the evaporative condenser and the ice storage tank are connected at one end to form a loop with the compressor;

[0010] The ice storage tank includes several ice storage coils, and the bottom ends of the ice storage tank are connected to plate heat exchangers, on which ice melting pumps are installed.

[0011] Evaporator;

[0012] The evaporator is located on one side of the compressor, and the two ends of the evaporator are respectively connected to the compressor and the evaporative condenser;

[0013] Air conditioning terminal unit;

[0014] The air conditioning terminal device includes a loop circuit, a refrigeration pump is connected to the air conditioning terminal device, the loop circuit of the air conditioning terminal device is pipe-connected to the evaporator, a loop branch is also provided on the loop circuit of the air conditioning terminal device, and the bottom of the air conditioning terminal device is pipe-connected to both ends of a plate heat exchanger.

[0015] Each pipeline is also equipped with valves for pipeline switching, including V1, V2, V3, V4, and Va, Vb, Vc, Vd.

[0016] Preferably, V3 is connected to the pipeline from the compressor to the ice storage tank.

[0017] Preferably, V2 is connected to the pipeline from the evaporative condenser to the ice storage tank.

[0018] Preferably, the evaporator is connected to pipes V1 and V4 at both ends.

[0019] Preferably, V1 and V2 are used to switch the refrigerant circuit to change the refrigeration and cold storage modes.

[0020] Preferably, the evaporator is connected to an expansion valve a and a temperature sensing bulb a5.

[0021] Preferably, the ice storage coil is connected to the expansion valve b and the temperature sensing bulb b.

[0022] Preferably, the piping from the refrigeration pump to the evaporator on the air conditioning terminal device is connected to Va near the loop branch, the loop branch is connected to Vb, the bottom of the air conditioning terminal device is connected to Vd, and the piping from the plate heat exchanger to the air conditioning terminal device is connected to Vc.

[0023] Preferably, Va, Vb, Vc, and Vd are used to switch the chilled water circuit to change different cooling modes.

[0024] (III) Beneficial Effects

[0025] The present invention provides a high-efficiency ice storage system, the advantages of which are:

[0026] 1. By switching pipelines, multiple operating modes can be achieved, such as direct cooling from the evaporator, ice storage tank, cooling from the ice storage tank, and combined cooling from the evaporator and ice storage tank.

[0027] 2. Switching between refrigeration and cold storage modes is achieved by switching the refrigerant circuits via V1 and V2;

[0028] 3. By switching the chilled water circuit through Va, Vb, Vc, and Vd, different cooling modes can be switched;

[0029] 4. Replace the traditional water-cooled condenser + cooling water pump + cooling tower with an evaporative condenser to reduce the energy consumption and cooling efficiency of the cooling system and improve the refrigeration efficiency of the compressor.

[0030] 5. The ice storage coil in the ice storage tank uses direct refrigerant evaporation to make ice instead of the traditional ice storage method that uses ethylene glycol as a refrigerant, which reduces energy consumption for cold energy transfer and heat exchange loss, and improves the refrigeration efficiency of the compressor. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the present invention.

[0033] The following are the labels in the diagram: 1. Compressor; 2. Evaporative condenser; 3. Evaporator; 4. Expansion valve a; 5. Temperature sensor a; 6. Refrigeration pump; 7. Air conditioning terminal unit; 8. Ice storage tank; 9. Expansion valve b; 10. Temperature sensor b; 11. Ice storage coil; 12. Plate heat exchanger; 13. Ice melting pump. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Specific Implementation Example 1

[0037] Please see Figure 1The present invention provides a high-efficiency ice storage system, including a compressor 1, wherein the bottom of the compressor 1 is connected to an ice storage tank 8 and the top is connected to an evaporative condenser 2, wherein the evaporative condenser 2 and the ice storage tank 8 are connected at one end, forming a loop with the compressor 1.

[0038] The ice storage tank 8 includes several ice storage coils 11. The bottom ends of the ice storage tank 8 are connected to plate heat exchangers 12, and the plate heat exchangers 12 are equipped with ice melting pumps 13.

[0039] Evaporator 3;

[0040] The evaporator 3 is located on one side of the compressor 1, and the two ends of the evaporator 3 are respectively connected to the compressor 1 and the evaporative condenser 2;

[0041] Air conditioning terminal unit 7;

[0042] The air conditioning terminal device 7 includes a ring circuit, a refrigeration pump 6 is connected to the air conditioning terminal device 7, the ring circuit of the air conditioning terminal device 7 is pipe-connected to the evaporator 3, a loop branch is also provided on the ring circuit of the air conditioning terminal device 7, and the bottom of the air conditioning terminal device 7 is also pipe-connected to both ends of the plate heat exchanger 12.

[0043] Each pipeline is also equipped with valves for pipeline switching, including V1, V2, V3, V4, and Va, Vb, Vc, Vd;

[0044] V3 is connected to the pipeline from compressor 1 to ice storage tank 8;

[0045] V2 is connected to the pipeline from the evaporative condenser 2 to the ice storage tank 8;

[0046] The evaporator 3 is connected to V1 and V4 at both ends;

[0047] V1 and V2 are used to switch the refrigerant circuit to change the refrigeration and cold storage modes;

[0048] The evaporator 3 is connected to expansion valve a4 and temperature sensing bulb a5;

[0049] The ice storage coil 11 is connected to the expansion valve b9 and the temperature sensing bulb b10;

[0050] The air conditioning terminal device 7 has a pipeline from the refrigeration pump 6 to the evaporator 3 and is connected to Va near the loop branch. The loop branch is connected to Vb. The bottom of the air conditioning terminal device 7 is connected to Vd. The plate heat exchanger 12 is connected to Vc on the pipeline connecting to the air conditioning terminal device 7.

[0051] Va, Vb, Vc, and Vd are used to switch the chilled water circuit to change different cooling modes; Specific Implementation Example 2

[0053] Cooling mode

[0054] Refrigerant cycle: Compressor 1 → Evaporative condenser 2 → V1 → Expansion valve a4 → Evaporator 3 → V4 → Compressor 1;

[0055] Chilled water circulation: Chilled water pump 6 → Va → Evaporator 3 → Vd → Air conditioning terminal unit 7 → Chilled water pump 6; Ice storage mode

[0056] Refrigerant cycle: Compressor 1 → Evaporative condenser 2 → V2 → Expansion valve b9 → Ice storage tank 8 → V3 → Compressor 1;

[0057] Melting mode

[0058] Chilled water circulation: chilled water pump 6 → Vb → Vc → plate heat exchanger 12 → air conditioning terminal unit 7 → chilled water pump 6;

[0059] Ice-water circulation: Ice melting pump 13 → Plate heat exchanger 12 → Ice storage tank 8 → Ice melting pump 13;

[0060] Cooling + Ice Melting Mode

[0061] Refrigerant cycle: Compressor 1 → Evaporative condenser 2 → V1 → Expansion valve a4 → Evaporator 3 → V4 → Compressor 1;

[0062] Chilled water circulation: chilled water pump 6 → Va → evaporator 3 → Vc → plate heat exchanger 12 → air conditioning terminal unit 7 → chilled water pump 6;

[0063] Ice-water circulation: Ice melting pump 13 → Plate heat exchanger 12 → Ice storage tank 8 → Ice melting pump 13;

[0064] Ice storage + ice melting mode

[0065] Refrigerant cycle: Compressor 1 → Evaporative condenser 2 → V2 → Expansion valve b9 → Ice storage tank 8 → V3 → Compressor 1;

[0066] Chilled water circulation: chilled water pump 6 → Vb → Vc → plate heat exchanger 12 → air conditioning terminal unit 7 → chilled water pump 6;

[0067] Ice-water circulation: Ice melting pump 13 → Plate heat exchanger 12 → Ice storage tank 8 → Ice melting pump 13; Specific Implementation Example 3

[0069] V1 and V2 switch refrigerant circuits to switch between cooling mode and cold storage mode;

[0070] Va, Vb, Vc, and Vd switch the chilled water circuit to switch the cooling mode;

[0071] Evaporative condenser 2 replaces the traditional water-cooled condenser + cooling water pump + cooling tower, reducing the energy consumption and cooling efficiency of the cooling system and improving the refrigeration efficiency of compressor 1.

[0072] The ice storage coil 11 inside the ice storage tank 8 uses direct evaporation of refrigerant to make ice instead of the traditional ice storage method that uses ethylene glycol as a refrigerant, which reduces energy consumption for cold energy transfer and heat exchange loss, and improves the refrigeration efficiency of the compressor 1.

[0073] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0074] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency ice storage system, comprising a compressor, wherein the bottom of the compressor is connected to an ice storage tank and the top of the compressor is connected to an evaporative condenser, wherein the evaporative condenser and the ice storage tank are connected at one end to form a loop with the compressor; The ice storage tank includes several ice storage coils, and the bottom ends of the ice storage tank are connected to plate heat exchangers, on which ice melting pumps are installed. Evaporator; The evaporator is located on one side of the compressor, and the two ends of the evaporator are respectively connected to the compressor and the evaporative condenser; Air conditioning terminal unit; The air conditioning terminal device includes a loop circuit, a refrigeration pump is connected to the air conditioning terminal device, the loop circuit of the air conditioning terminal device is pipe-connected to the evaporator, a loop branch is also provided on the loop circuit of the air conditioning terminal device, and the bottom of the air conditioning terminal device is pipe-connected to both ends of a plate heat exchanger. It also includes refrigerant circuit valves and chilled water circuit valves. The refrigerant circuit valves include V1, V2, V3, and V4, and the chilled water circuit valves include Va, Vb, Vc, and Vd. V1 is located on the pipeline between the outlet of the evaporative condenser and the inlet of the evaporator. V2 is located on the refrigerant pipeline between the outlet of the evaporative condenser and the inlet of the ice storage coil in the ice storage tank. V3 is located on the pipeline between the outlet of the ice storage coil in the ice storage tank and the return gas port of the compressor. V4 is located on the refrigerant connection pipeline between the outlet of the evaporator and the return gas port of the compressor. Va is located on the connection pipeline from the chilled water pump outlet main pipe to the water inlet of the evaporator. Vb is located on the air conditioning terminal device circuit branch. Vc is connected in series between the plate heat exchanger and the air conditioning terminal device circuit branch. The pipeline containing Vd is connected in parallel with the pipeline containing the plate heat exchanger and the pipeline containing Vc.

2. The high-efficiency ice storage system as described in claim 1, characterized in that, The evaporator is connected to expansion valve a and temperature sensing bulb a.

3. The high-efficiency ice storage system as described in claim 1, characterized in that, The ice storage coil is connected to expansion valve b and temperature sensing bulb b.

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