CN113048671A - Cooling capacity step adjustment type solar jet refrigeration device and control method - Google Patents
Cooling capacity step adjustment type solar jet refrigeration device and control method Download PDFInfo
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- CN113048671A CN113048671A CN202110472556.0A CN202110472556A CN113048671A CN 113048671 A CN113048671 A CN 113048671A CN 202110472556 A CN202110472556 A CN 202110472556A CN 113048671 A CN113048671 A CN 113048671A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/08—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using ejectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
- F25B27/007—Machines, plants or systems, using particular sources of energy using solar energy in sorption type systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/04—Arrangement or mounting of control or safety devices for sorption type machines, plants or systems
- F25B49/043—Operating continuously
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention discloses a cooling capacity step regulation type solar jet refrigeration device and a control method, which are suitable for the field of refrigeration air conditioners. The device comprises a solar heat collector, a circulating water pump, a heat storage tank, a refrigerant absorption generator, an ejector, an evaporator, a condenser, a throttle valve, a refrigerant pump and a liquid storage tank. Solar energy is collected through a solar thermal collector and stored to a heat storage tank, energy stored in the heat storage tank is released at a refrigerant absorption generator to drive refrigeration cycle operation, a plurality of groups of ejectors, evaporators and condensers which are connected in parallel are utilized, and the refrigerating capacity is adjusted by controlling the models and the number of the ejectors connected in parallel, so that the requirement of constantly changing refrigerating capacity of a user end can be met, the problem of supply and demand balance between the refrigerating capacity and air conditioner load is solved, and the utilization rate of solar energy is improved.
Description
Technical Field
The invention relates to the technical field of refrigeration and low temperature, in particular to a cooling capacity step regulation type solar jet refrigeration device for supplying cold by using solar energy and a control method.
Background
With the increase of energy shortage and environmental protection pressure, the application of solar energy is gradually emphasized. The seasonal adaptability of solar refrigeration is good, and the refrigerating capacity of the system is larger when the weather is hotter and the refrigeration is more needed. Compared with other refrigeration methods, the solar jet refrigeration method has a simple structure and low installation cost and maintenance cost, and has attracted extensive attention in recent years. However, the conventional solar jet refrigeration system has only one ejector, and the ejector is fixed in structure size, so that when the weather is hotter, the generated temperature is increased along with the enhancement of solar radiation and exceeds the designed value, the refrigeration capacity of the system cannot be correspondingly increased, but is reduced. Therefore, with the rise of solar radiation and air temperature, the traditional solar jet refrigeration system can not meet the requirement of increasing the refrigerating capacity, and the phenomenon of reducing the energy utilization rate of the system also occurs.
Disclosure of Invention
The technical problem is as follows: the invention aims to overcome the defects in the prior art and provides a cold quantity adjustable solar jet refrigeration device and a control method thereof so as to solve the problem of supply and demand balance between refrigeration quantity and air conditioner load which is difficult to realize by the conventional solar jet refrigeration system.
The technical scheme is as follows: the invention relates to a cooling capacity step regulation type solar jet refrigeration device, which comprises a heat collection circulation loop, a heat taking circulation loop, a jet refrigeration loop and an air conditioner cold water circulation loop, wherein the heat collection circulation loop is connected with the heat taking circulation loop; the heat collection circulation loop comprises a solar heat collector, a circulating water pump and a heat storage tank which are connected in series through pipelines; the heat taking circulation loop comprises a circulating water pump and a refrigerant absorption generator which are sequentially connected with a heat storage tank in series through a pipeline; the injection refrigeration loop comprises a refrigerant circulating pump, a liquid storage tank, a plurality of condensers and an ejector, wherein the refrigerant circulating pump, the liquid storage tank and the plurality of condensers and the ejector are connected with a refrigerant absorption generator in series through a pipeline; the other outlet of the liquid storage tank is connected with the inlet of a refrigerant circulating pump through a pipeline, and the outlet of the refrigerant circulating pump is connected with the inlet of a refrigerant absorption generator through a pipeline; the air conditioner cold water circulation loop comprises a user side cold water return pipeline connected with the inlet end of the evaporator and a user side cold water supply pipeline connected with the outlet end of the evaporator, and cold water return water with raised temperature returned from the user side is cooled by the evaporator and then is used as air conditioner cold water supply water to be supplied to the user side.
The number of the condensers and the ejectors and the number of the throttle valves and the evaporators which are connected with the condensers and the ejectors in series are 2-4, and the condensers and the ejectors correspond to one another.
The plurality of condensers, the plurality of ejectors, and the plurality of throttle valves and the plurality of evaporators connected in series with the plurality of condensers and the plurality of ejectors may be of the same type or different types.
And the front pipelines of the working fluid inlets of the plurality of ejectors are respectively provided with an ejector control valve.
And the inlet ends of the evaporators connected with the cold water return pipeline of the user side are respectively provided with a return water control valve.
A control method for the solar jet refrigeration device utilizing the cooling capacity step regulation type comprises the following steps:
a. and (3) a system refrigeration process: according to the temperature or the flow of cold water backwater at a user side, controlling the opening of a valve on a pipeline in front of a working fluid inlet of the ejector so as to control the operation type and the number of the ejectors; meanwhile, the opening degree of the throttle valve is controlled according to the temperature of each evaporator;
b. air conditioner cold water circulation process: and according to the model and the number of the operated ejectors of the refrigeration system, opening of a corresponding backwater control valve on a cold water backwater port of the user side and an evaporator inlet connecting pipeline is controlled, so that the operation of the corresponding evaporator is controlled.
Has the advantages that: by adopting the technical scheme, the refrigerating capacity is adjusted by controlling the type and the number of the parallel ejectors, the requirement that the refrigerating capacity of a user side is constantly changed can be met, the problem of supply and demand balance between the refrigerating capacity and the air conditioner load is solved, and the solar energy utilization rate is improved. Compared with the traditional solar jet refrigeration system which adopts a single ejector with a fixed structure, the solar jet refrigeration system provided by the invention is additionally provided with a plurality of groups of ejectors connected in parallel, corresponding evaporators, condensers, throttle valves and corresponding control valves, so that the phenomenon that the traditional solar jet refrigeration system cannot effectively adjust the refrigerating capacity along with the change of solar radiation and generated temperature is solved, and the problem of supply and demand balance between the refrigerating capacity and the air conditioning load is realized. The novel multifunctional electric heating cooker is simple in structure, convenient to operate, good in using effect and wide in practicability in the technical field.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: a-solar heat collector; B. d, a circulating water pump; c, a heat storage tank; e-a refrigerant absorption generator; f1、F2、F3-an ejector; g1、G2、G3-an evaporator; h1、H2、H3-a condenser; i is1、I2、I3-a throttle valve; j-refrigerant pump; k, a liquid storage tank; l is1、L2、L3-an ejector control valve; m1、M2、M3-a water return control valve.
Detailed Description
The invention will be further described with reference to examples in the drawings to which:
the invention relates to a cooling capacity step regulation type solar jet refrigeration device which mainly comprises a heat collection circulation loop, a heat taking circulation loop, a jet refrigeration loop and an air conditioner cold water circulation loop; the heat collection circulation loop comprises a solar heat collector A, a circulating water pump B and a heat storage tank C which are connected in series through pipelines; the heat taking circulation loop comprises a circulating water pump D and a refrigerant absorption generator E which are sequentially connected with a heat storage tank C in series through a pipeline; the injection refrigeration loop comprises a refrigerant circulating pump J, a liquid storage tank K, a plurality of condensers H and ejectors F which are connected in parallel, wherein the refrigerant circulating pump J is connected with a refrigerant absorption generator E in series through a pipeline, the liquid storage tank K is simultaneously connected with a plurality of throttle valves I and evaporators G in series, the plurality of throttle valves I and evaporators G in parallel are connected with the plurality of condensers H and ejectors F in series, the number of the plurality of condensers H and ejectors F and the number of the plurality of throttle valves I and evaporators G connected with the plurality of condensers H and ejectors F in series are 2-4, the condensers H and the ejectors F are in one-to-one correspondence with each other, the types of the plurality of condensers H and ejectors F and the plurality of throttle valves I and evaporators G connected with the plurality of condensers H and ejectors F in series. And the front pipelines of the working fluid inlets of the plurality of ejectors F are respectively and correspondingly provided with an ejector control valve L. The outlet of the refrigerant absorption generator E is connected with the working fluid inlet of the ejector F through a pipeline, the outlet of the ejector F is connected with the inlet of the condenser H through a pipeline, the outlet of the condenser H is connected with the inlet of the liquid storage tank K through a pipeline, one outlet of the liquid storage tank K is connected with the inlet of the throttle valve I through a pipeline, the outlet of the throttle valve I is connected with the inlet of the evaporator G through a pipeline, and the outlet of the evaporator G is connected with the inlet of the ejector F for injecting fluid through a pipeline; and the inlet ends of the plurality of evaporators G connected with the cold water return pipeline of the user side are respectively and correspondingly provided with a return water control valve M. The other outlet of the liquid storage tank K is connected with the inlet of a refrigerant circulating pump J through a pipeline, and the outlet of the refrigerant circulating pump J is connected with the inlet of a refrigerant absorption generator E through a pipeline; the air conditioner cold water circulation loop comprises a user side cold water return pipeline connected with the inlet end of the evaporator G and a user side cold water supply pipeline connected with the outlet end of the evaporator G, and cold water return water with raised temperature returned from the user side is cooled by the evaporator G and then is used as air conditioner cold water supply water to be supplied to the user side.
The invention relates to a method for a cooling capacity step regulation type solar jet refrigeration device, which comprises the following specific processes:
a. and (3) a system refrigeration process: according to the temperature or the flow of cold water backwater at a user end, controlling the opening of a valve L on a pipeline in front of a working fluid inlet of an ejector F, so as to control the type and the number of the operation of the ejector F; meanwhile, the opening degree of the throttle valve I is controlled according to the temperature of each evaporator G;
b. air conditioner cold water circulation process: and according to the type and the number of the operated ejectors F of the refrigeration system, controlling the opening of a backwater control valve M on a connecting pipeline between a cold water backwater port of the user side and an inlet of the evaporator G, thereby controlling the operation of the corresponding evaporator G.
In the first embodiment, the number of the plurality of condensers H, the plurality of ejectors F, and the plurality of throttle valves I and the plurality of evaporators G connected in series with the plurality of condensers H and the plurality of ejectors F is determined according to actual needs, and the number of the condensers H and the plurality of ejectors F is 3 as shown in fig. 1, and the condensers H and the plurality of ejectors F correspond to each other one by one, that is, 3 condensers H and F1、H2、H33 evaporators G1、G2G, 3 injectors F1、F2、F33 throttle valves I1、I2、I33 control valves L1、L2、L3And 3 control valves M1、M2、M3. The solar heat collector A, the circulating water pump B and the heat storage tank C are connected in series through pipelines to form a heat collection circulating loop; the heat storage tank C, the circulating water pump D and the refrigerant absorption generator E are connected in series through pipelines to form a heat taking circulating loop; refrigerant absorption generator E, 3 condensers H1、H2、H33 evaporators G1、G2、G33 injectors F1、F2、F33 throttle valves I1、I2、I3Liquid storage tank K, refrigerant circulating pump J and 3 control valves L1、L2、L3Are respectively connected in series through pipelines to form an injection refrigeration loop; user side backwater port and 3 control valves M1、M2、M33 evaporators G1、G2、G3And the water supply ports of the user ends are respectively connected in series to form an air conditioner cold water circulation loop through pipelines. The return water of the cold water with the increased temperature returned from the user side is cooled by the evaporator G and then is used as cold water supply water of the air conditioner to be sent to the user side.
The outlet of the refrigerant absorption generator E is respectively connected with 3 control valves L which are connected in parallel through pipelines1、L2、L3Is connected with the inlet of the three-way valve, and 3 control valves L are connected in parallel1、L2、L3The outlet is respectively connected with 3 parallel ejectors F through pipelines1、F2、F33 parallel-connected ejectors F1、F2、F3The outlet is connected with 3 condensers H in parallel through pipelines respectively1、H2、H33 condensers H connected in parallel1、H2、H3The outlets of the two throttle valves are respectively connected with the inlet of the liquid storage tank K through pipelines, and one outlet of the liquid storage tank K is respectively connected with the 3 parallel throttle valves I through pipelines1、I2、I3Is connected with 3 parallel throttle valves I1、I2、I3The outlets of the evaporators are respectively connected with 3 evaporators G in parallel through pipelines1、G2、G3Inlet connected, 3 parallel evaporators G1、G2、G3The outlets of the ejectors F are respectively connected with 3 ejectors F in parallel through pipelines1、F2、F3The inlets of the ejection fluids are connected; the other outlet of the liquid storage tank K is connected with the inlet of a refrigerant circulating pump J through a pipeline, and the outlet of the refrigerant circulating pump J is connected with the inlet of a refrigerant absorption generator E through a pipeline. The air conditioner cold water circulation loop is provided with a user end backwater port and 3 evaporators G connected in parallel1、G2、G3The inlet connecting pipeline is provided with a control valve M1、M2、M3Each evaporator G1Corresponding to a control valve M on the inlet connecting pipeline1。
According to the temperature or the flow of the cold water return water returned by the user end, the cold water is passed through the 3 ejectors F connected in parallel1、F2、F33 corresponding control valves L on the inlet front pipeline of the working fluid1、L2、L3Controlling 3 injectors F1、F2、F3The running types and the quantity are determined by the backwater port of the user end and the 3 evaporators G connected in parallel1、G2、G33 control valves M corresponding to the inlet connecting pipeline1、M2、M3Controlling and corresponding to 3 injectors F1、F2、F3Connected 3 evaporators G1、G2、G3The operation of (2); according to 3 evaporators G1、G2、G3Temperature regulation of 3 throttle valves I1、I2、I3The opening degree of (c).
Claims (6)
1. A cooling capacity step regulation type solar jet refrigeration device comprises a heat collection circulation loop, a heat taking circulation loop, a jet refrigeration loop and an air conditioner cold water circulation loop; the method is characterized in that: the heat collection circulation loop comprises a solar heat collector (A), a circulating water pump (B) and a heat storage tank (C) which are connected in series through pipelines; the heat taking circulation loop comprises a circulating water pump (D) and a refrigerant absorption generator (E) which are sequentially connected with a heat storage tank (C) in series through a pipeline; the injection refrigeration loop comprises a refrigerant circulating pump (J) connected with a refrigerant absorption generator (E) in series through a pipeline, a liquid storage tank (K), a plurality of condensers (H) and an ejector (F) which are connected in parallel, wherein the liquid storage tank (K) is simultaneously connected with a plurality of throttle valves (I) and evaporators (G) which are connected in parallel in series, the plurality of throttle valves (I) and the evaporators (G) which are connected in parallel are connected with the plurality of condensers (H) and the ejector (F) in series, an outlet of the refrigerant absorption generator (E) is connected with a working fluid inlet of the ejector (F) through a pipeline, an outlet of the ejector (F) is connected with an inlet of the condenser (H) through a pipeline, an outlet of the condenser (H) is connected with an inlet of the liquid storage tank (K) through a pipeline, one outlet of the liquid storage tank (K) is connected with an inlet of the throttle valve (I) through a, the outlet of the throttle valve (I) is connected with the inlet of an evaporator (G) through a pipeline, and the outlet of the evaporator (G) is connected with the inlet of the ejector (F) for ejecting fluid through a pipeline; the other outlet of the liquid storage tank (K) is connected with the inlet of a refrigerant circulating pump (J) through a pipeline, and the outlet of the refrigerant circulating pump (J) is connected with the inlet of a refrigerant absorption generator (E) through a pipeline; the air conditioner cold water circulation loop comprises a user side cold water return pipeline connected with the inlet end of the evaporator (G) and a user side cold water supply pipeline connected with the outlet end of the evaporator (G), and cold water return water with raised temperature returned from the user side is cooled by the evaporator (G) and then is used as air conditioner cold water to be supplied to the user side.
2. The solar jet refrigeration device of a cold cascade regulation type according to claim 1, characterized in that: the plurality of condensers (H), the ejectors (F) and the plurality of throttle valves (I) and the evaporators (G) which are connected with the plurality of condensers (H) and the ejectors (F) in series are all 2-4 and are in one-to-one correspondence.
3. The solar jet refrigeration device of a cold cascade regulation type according to claim 1, characterized in that: the types of the plurality of condensers (H), the ejector (F) and the plurality of throttle valves (I) and the evaporators (G) which are connected with the plurality of condensers (H) and the ejector (F) in series are the same or different.
4. The solar jet refrigeration device of a cold cascade regulation type according to claim 1, characterized in that: and the front pipelines of the working fluid inlets of the plurality of ejectors (F) are respectively provided with an ejector control valve (L).
5. The solar jet refrigeration device of a cold cascade regulation type according to claim 1, characterized in that: and the inlet ends of the evaporators (G) connected with the cold water return pipeline of the user side are respectively provided with a return water control valve (M).
6. A control method of a solar jet refrigerating apparatus of a cooling step regulation type using the solar jet refrigerating apparatus of claim 1, 2, 3, 4 or 5, characterized by comprising the steps of:
a. and (3) a system refrigeration process: according to the temperature or the flow of cold water backwater at a user end, controlling the opening of a valve (L) on a pipeline in front of a working fluid inlet of the ejector (F) so as to control the operation type and the number of the ejectors (F); simultaneously controlling the opening degree of the throttle valve (I) according to the temperature of each evaporator (G);
b. air conditioner cold water circulation process: according to the model and the number of the operated ejectors (F) of the refrigeration system, the opening of a corresponding backwater control valve (M) on a connecting pipeline between a cold water backwater port of a user side and an inlet of the evaporator (G) is controlled, so that the operation of the corresponding evaporator (G) is controlled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110472556.0A CN113048671A (en) | 2021-04-29 | 2021-04-29 | Cooling capacity step adjustment type solar jet refrigeration device and control method |
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| CN202110472556.0A CN113048671A (en) | 2021-04-29 | 2021-04-29 | Cooling capacity step adjustment type solar jet refrigeration device and control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113280523A (en) * | 2021-05-31 | 2021-08-20 | 哈尔滨工业大学 | Injection type heat pump circulating device with supercooling and preheating functions |
| CN113776228A (en) * | 2021-10-08 | 2021-12-10 | 中国矿业大学 | Regulating and controlling device and method for solar jet refrigeration system |
| CN115096011A (en) * | 2022-06-20 | 2022-09-23 | 江苏凌氢新能源科技有限公司 | Cascaded ejector multiple evaporator refrigeration system |
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Application publication date: 20210629 |