CN209355524U - A cooling and heating energy utilization system - Google Patents

Abstract

The utility model discloses a kind of cold and hot energy utility system, the system include refrigeration cycle subsystem, cooling capacity multistage with subsystem and heat step with subsystem；Heat step uses subsystem packet hothouse, heat exchanger and fan coil；Cooling capacity gradient utilization system includes cold, air-cooler, evaporator, regulation station, and evaporator is connect by expansion valve with regulation station；Refrigeration cycle subsystem includes refrigeration compressor, condenser, gas-liquid separator and heat exchanger, evaporator；Condenser is connected with gas-liquid separator, and gas-liquid separator is connected with compressor；Regulation station is the device for exporting cooling capacity step.This system both can use the cooling capacity that refrigerant manufactures in evaporator in refrigeration cycle subsystem, provide cold source for freezer；It can use the heat that the high-temperature high-pressure refrigerant come out from compressor discharges again, provide heat source for hothouse, be a kind of energy saving, saving cost, the system for effectively improving cooling capacity and heat utilization ratio.

Description

A cooling and heating energy utilization system

technical field

The utility model relates to the technical field of refrigeration, in particular to a cold and heat energy utilization system.

Background technique

The single-stage vapor compression refrigeration system consists of four main components: evaporator, compressor, condenser, and expansion valve. The refrigerant vapor is compressed by the compressor only once in each refrigeration cycle, which is called single-stage vapor compression.

In the refrigeration cycle, the refrigerant mainly goes through four processes: compression process, condensation process, throttling process and evaporation process. In the compression process, the low-temperature and low-pressure refrigerant vapor is compressed into a high-temperature and high-pressure refrigerant vapor; in the condensation process, the high-temperature and high-pressure refrigerant vapor is condensed into a high-temperature and high-pressure refrigerant liquid; The refrigerant liquid is throttled and decompressed into a low-temperature and low-pressure refrigerant liquid; during the evaporation process, the low-temperature and low-pressure refrigerant liquid is evaporated into a low-temperature and low-pressure refrigerant vapor, thus completing a refrigeration cycle.

During the evaporation process, the refrigerant undergoes a phase change in the evaporator, from liquid to gas, evaporates to absorb heat, and produces cooling capacity; in the condensation process, the refrigerant undergoes a phase change in the condenser, from gas to liquid, Release the heat.

The cooling capacity produced by the refrigerant in the evaporator is often not fully utilized due to unreasonable utilization during use; the heat released by the refrigerant in the condenser is often ignored, resulting in heat loss. Not being used effectively.

Contents of the invention

Aiming at the defects of the above-mentioned prior art, the utility model provides an energy-saving, environment-friendly, high-efficiency and cost-saving cold and heat energy utilization system, which improves the effective utilization rate of cooling and heat, saves energy and costs.

For realizing above-mentioned purpose, the technical scheme that the utility model takes is:

A cooling and heating energy utilization system, the system includes a refrigeration cycle subsystem, a cooling capacity multi-stage application subsystem and a heat cascade application subsystem;

The heat cascade application subsystem includes several drying chambers using cascade heat drying, several heat exchangers connected in series, and several fan coil units respectively connected to the several heat exchangers. Set in several drying rooms;

The cooling capacity cascade utilization system includes a regulating station capable of cascading output of cooling capacity, several cold rooms adopting cascaded cooling capacity cooling, several air coolers respectively arranged in the cold rooms, and several air coolers connected to the several air coolers. An evaporator, several evaporators are arranged in parallel and communicated with the cold output port of the regulating station through several expansion valves;

The refrigerating cycle subsystem includes a refrigerating compressor, a condenser, a gas-liquid separator, an expansion valve, and several heat exchangers connected in series; the condenser communicates with the gas-liquid separator, and the gas-liquid separator communicates with the The compressors are connected, and several heat exchangers are arranged in series between the refrigeration compressor and the condenser; the high-pressure and low-temperature port of the regulating station is connected to the high-pressure and low-temperature port of the gas-liquid separator, and the regulating station is provided with several Several low-pressure and low-temperature outlets are used to output the cooling capacity in stages. The regulating station is respectively connected to several evaporators through several expansion valves, and the low-pressure and low-temperature outlets of the several evaporators are connected to the gas-liquid separator.

As an improvement to the above technical solution, an expansion vessel is connected to the communication pipeline between the gas-liquid separator and the refrigeration compressor, a pressure control valve is provided on the inlet channel of the expansion vessel, and a check valve is provided on the outlet channel .

As an improvement to the above technical solution, a liquid accumulator is provided between the condenser and the gas-liquid separator, an oil collector is provided between the refrigeration compressor and the first-stage heat exchanger, and the oil collector The oil return pipe of the device is connected to the refrigeration compressor.

As an improvement to the above technical solution, the condenser is an evaporative condenser, the heat exchanger is a plate heat exchanger and there are two, correspondingly forming two drying rooms, and the drying rooms are provided with fan coils , the heat exchanger is connected with the fan coil.

As an improvement to the above technical solution, there are three cold rooms, and correspondingly three cooling fans and evaporators.

As an improvement to the above technical solution, on the communication channel between the oil collector and the compressor, on the communication channel between the fan coil unit and the condenser, on the communication channel between the gas-liquid separator and the regulating station, A valve is arranged on the communication channel between the adjustment station and the evaporator, and on the communication channel between the evaporator and the cooling fan.

Compared with the prior art, the beneficial effects obtained by the utility model are:

In the cooling capacity cascade utilization system and the cold and heat energy utilization system of the utility model, during operation, the refrigerant in the refrigeration cycle subsystem is regulated by the regulating station and transported to different evaporators. To flexibly adjust the refrigerating capacity of each evaporator, and manufacture the refrigerating temperature required by different cold rooms of the cold storage; the multi-level use of the cooling capacity uses the bridging refrigerant in the sub-system to exchange heat with the refrigerant in the evaporator, and through the cold air The machine transports cooling capacity to the cold storage to create low temperature, and the cooling fan adopts frequency conversion motor, which can flexibly control the delivery of cooling capacity, so that different cold rooms in the cold storage can maintain their respective constant low temperature; the thermal cascade application subsystem, through successive heat exchanges, controls the refrigeration cycle. In the sub-system, the high-temperature and high-pressure refrigerant vapor from the compressor is cooled in steps, and the heat obtained in the heat exchange process is used for drying in the drying room through the heat transfer medium water and the fan coil, so as to achieve the effect of cascade utilization of heat. Purpose.

Therefore, the utility model can not only use the cold produced by the refrigerant in the evaporator in the refrigeration cycle subsystem to provide a cold source for the cold storage; but also use the heat released by the high-temperature and high-pressure refrigerant from the compressor to provide a heat source for the drying chamber , is a system that saves energy, saves costs, and improves the effective utilization of cooling and heat.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

Fig. 1 is the structural representation of the utility model.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without creative work, any modifications, equivalent replacements, improvements, etc., shall be included in the protection of the present utility model. within range.

The cold and heat energy utilization system of the utility model includes a refrigeration cycle subsystem, a multi-level application subsystem of cooling capacity and a heat cascade application subsystem; the main equipment in the refrigeration cycle subsystem includes: a compressor, an oil collector, a plate heat exchanger Condenser, condenser, liquid receiver, gas-liquid separator, expansion valve, regulating station, evaporator, expansion vessel, pressure control valve, pipeline, etc.; the main equipment in the cooling multi-stage utilization subsystem includes: evaporator, cold air Machines, valves, pipelines, etc.; the main equipment in the thermal cascade application subsystem includes: plate heat exchangers, fan coils, valves, pipelines, etc. The main equipment in the refrigeration cycle subsystem, the cooling capacity multi-level application subsystem and the heat cascade application subsystem are connected through specific pipes; the cooling capacity multi-level application subsystem and the refrigeration cycle subsystem are connected through the evaporator; The system is connected with the refrigeration cycle subsystem through a plate heat exchanger. Ammonia is used as the refrigerant in the refrigerating cycle subsystem; low-temperature refrigerant is used as the brine in the multi-stage application subsystem of cooling capacity; water is used as the heat transfer medium in the heat cascade application subsystem.

Fig. 1 is a schematic diagram of the system principle of the utility model. As shown in Figure 1, the refrigeration cycle subsystem is: 1-2-3-4-5-6-7-9-9'-8-1, 1-2-3-4-5-6-7-10 -10'-8-1, 1-2-3-4-5-6-7-11-8-1; cooling multi-stage application subsystem: 16-17-16, 18-19-18, 20 -21-20. The thermal cascade application subsystem is: 12-13-12, 14-15-14.

In practical application, the low-temperature and low-pressure refrigerant ammonia vapor in the refrigeration cycle subsystem enters compressor A through pipeline 1, and is compressed into high-temperature and high-pressure refrigerant ammonia vapor in compressor A; the high-temperature and high-pressure refrigerant ammonia vapor passes through pipeline 2 and enters the oil collector Device B, which separates and collects the lubricating oil droplets carried in the high-temperature and high-pressure refrigerant ammonia vapor; after that, the high-temperature and high-pressure refrigerant ammonia vapor passes through pipeline 3, plate heat exchanger C1, pipeline 4, and plate heat exchanger C2 successively, and successively passes through the plate heat exchanger Heat exchange occurs in the heat exchanger C1 and the plate heat exchanger C2, and then enters the evaporative condenser C3 through the pipeline 5, and is condensed into a low-temperature and high-pressure refrigerant ammonia liquid; the low-temperature and high-pressure refrigerant ammonia liquid passes through the pipeline 6, liquid receiver D, and The pipeline 7 enters the gas-liquid separator E; the high-pressure and low-temperature refrigerant ammonia liquid in the pipeline in the gas-liquid separator E exchanges heat with the low-temperature and low-pressure refrigerant ammonia liquid in the gas-liquid separator E to form supercooled high-pressure and low-temperature Refrigerant ammonia liquid; supercooled high-pressure low-temperature refrigerant ammonia liquid enters the regulating station L through the valve K3; through the regulating station L, it is divided into three circuits to complete the refrigeration cycle. First way: High-pressure and low-temperature refrigerant ammonia liquid passes through valve K4, expansion valve G1, and pipeline 9 in turn from the regulating station L, throttling and reducing pressure, and becomes low-pressure and low-temperature refrigerant ammonia liquid, and then enters evaporator F3 to evaporate and absorb heat. Become low-pressure low-temperature refrigerant ammonia vapor; low-pressure low-temperature refrigerant ammonia vapor passes through pipeline 9' and pipeline 8 in turn, enters gas-liquid separator E, mixes with superheated refrigerant ammonia vapor in gas-liquid separator E, and simultaneously separates low-temperature and low-pressure The low-temperature and low-pressure refrigerant ammonia liquid contained in the refrigerant ammonia vapor; the low-temperature and low-pressure refrigerant ammonia vapor enters the compressor A through pipeline 1, and is compressed into high-temperature and high-pressure refrigerant ammonia vapor; The regulating station L passes through the valve K5, the expansion valve G2, and the pipeline 10 in turn, throttling and reducing the pressure, and becomes a low-pressure low-temperature refrigerant ammonia liquid, and then enters the evaporator F2, evaporates and absorbs heat, and becomes a low-pressure low-temperature refrigerant ammonia vapor; low-pressure low-temperature refrigeration The ammonia vapor passes through the pipeline 10' and the pipeline 8 in turn, enters the gas-liquid separator E, mixes with the superheated refrigerant ammonia vapor in the gas-liquid separator E, and simultaneously separates the low-temperature and low-pressure refrigerant contained in the low-temperature and low-pressure refrigerant ammonia vapor. Ammonia liquid; low-temperature and low-pressure refrigerant ammonia vapor enters compressor A through pipeline 1, and is compressed into high-temperature and high-pressure refrigerant ammonia vapor; third route: high-pressure and low-temperature refrigerant ammonia liquid passes through valve K6 and expansion valve in turn from regulating station L G3, throttling and reducing pressure, becomes low-pressure low-temperature refrigerant ammonia liquid, then enters evaporator F1, evaporates and absorbs heat, and becomes low-pressure low-temperature refrigerant ammonia vapor; low-pressure low-temperature refrigerant ammonia vapor passes through pipeline 11 and pipeline 8 in sequence, and enters gas-liquid The separator E is mixed with the superheated refrigerant ammonia vapor in the gas-liquid separator E, and at the same time separates the low-temperature and low-pressure refrigerant ammonia liquid contained in the low-temperature and low-pressure refrigerant ammonia vapor; the low-temperature and low-pressure refrigerant ammonia vapor enters through the pipeline 1 Compressor A is compressed into high-temperature and high-pressure refrigerant ammonia vapor, and a refrigeration cycle is completed so far.

In practical application, when the refrigeration cycle subsystem stops running, the refrigerant ammonia in the system absorbs heat and expands, the pressure in the system rises, the pressure control valve I opens, and the refrigerant ammonia passes through the pressure control valve I and the pipeline 23, and enters the expansion vessel H , to reduce the pressure in the system; when the refrigeration cycle subsystem is running, the refrigerant ammonia in the expansion vessel H enters the system through the pipeline 22 and the one-way valve J in turn to perform the refrigeration cycle.

In practical application, the bridging refrigerant refrigerant in the sub-system of multi-level application of cooling capacity performs heat exchange with the low-temperature and low-pressure refrigerant ammonia in evaporator F1, evaporator F2, and evaporator F3 respectively, and delivers cooling capacity; in cold room 1 , the refrigerant liquid passes through the valve K9, the pipeline 16, the air cooler N1, the pipe 17, the evaporator F1, and the valve K9 to complete a cycle. 1. In the cold room 2, the brine refrigerant passes through the valve K10, pipeline 18, air cooler N2, pipeline 19, evaporator F2, and valve K10 to complete a cycle. The cooling capacity in the brine refrigerant passes through the cold air Machine N2 is transported to cold room 2; in cold room 3, the refrigerant liquid passes through valve K11, pipeline 20, air cooler N3, pipeline 21, evaporator F3, and valve K11 to complete a cycle. The cooling capacity is transported to the cold room 3 by the cooling fan N3.

The utility model adopts the adjustment station L to adjust the refrigerant flow rate delivered to different evaporators, and has the advantages of flexibly adjusting the cooling capacity of each evaporator according to the difference in the refrigerant delivery flow rate, and manufacturing the refrigeration temperature required by different cold rooms of the cold storage; In the evaporator F1, evaporator F2, and evaporator F3, the brine refrigerant in the multi-stage application subsystem exchanges heat with the refrigerant respectively, and delivers cold energy to the cold room of the cold storage through the air cooler to create a low temperature, and The cooling fan adopts a frequency conversion motor, which has the advantages of being able to flexibly control the delivery of cooling capacity, so that different cold rooms in the cold storage can maintain their respective constant low temperature, and improve the utilization rate of cooling capacity.

In practical application, heat cascade uses water as the heat transfer medium of the subsystem to exchange heat with high-temperature and high-pressure refrigerant ammonia vapor in plate heat exchanger C1 and plate heat exchanger C2 respectively, and transfer heat; in drying chamber 1, heat transfer The medium water passes through valve K7, pipeline 12, fan coil M1, pipeline 13, plate heat exchanger C1, and valve K7 to complete a cycle. The heat in the heat transfer medium water is transported to the drying chamber 1 through the fan coil M1; In chamber 2, the heat transfer medium water passes through the valve K8, pipe 14, fan coil M2, pipe 15, plate heat exchanger C2, and valve K8 to complete a cycle, and the heat in the heat transfer medium water is transported through the fan coil M2 to drying chamber 2.

The utility model adopts the plate heat exchanger C1 and the plate heat exchanger C2 to successively cool down the high-temperature and high-pressure refrigerant ammonia vapor coming out of the compressor A of the refrigerating cycle subsystem, and transfer the heat obtained through the heat exchange through the fan coil unit. M1 and fan coil M2 are transported to drying chamber 1 and drying chamber 2 respectively to form two constant temperature drying chambers with different temperatures, with cascaded utilization of high-temperature and high-pressure refrigerant ammonia vapor from compressor A in the refrigeration cycle subsystem The advantage of the released heat improves the utilization rate of heat.

In practical applications, the pipes used all have good temperature resistance, pressure resistance, and corrosion resistance to the refrigerant ammonia.

While preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once the basic inventive concept is appreciated. Therefore, the appended claims are intended to be interpreted to cover the preferred embodiment and all changes and modifications which fall within the scope of the present invention.

Claims (6)

1. A cooling and heating energy utilization system, characterized in that the system includes a refrigeration cycle subsystem, a cooling capacity multi-level application subsystem and a heat cascade application subsystem; The heat cascade application subsystem includes several drying chambers using cascade heat drying, several heat exchangers connected in series, and several fan coil units respectively connected to the several heat exchangers. It is installed in several drying rooms; the cold capacity cascade utilization system includes a regulating station that can output the cold capacity in steps, several cold rooms using cascaded cooling, several air coolers respectively arranged in the cold rooms, and several A plurality of evaporators connected to the cooling fan, the plurality of evaporators are arranged in parallel and communicated with the cold output port of the regulating station through a plurality of expansion valves; the refrigeration cycle subsystem includes a refrigeration compressor, a condenser, a gas-liquid Separator, expansion valve and several heat exchangers connected in series; the condenser communicates with the gas-liquid separator, the gas-liquid separator communicates with the compressor, and several heat exchangers are arranged in series Between the refrigeration compressor and the condenser; the high-pressure and low-temperature port of the regulating station is connected to the high-pressure and low-temperature port of the gas-liquid separator. Several expansion valves are respectively connected to several evaporators, and the low-pressure and low-temperature outlets of the several evaporators are connected to the gas-liquid separator. 2. The cold and heat energy utilization system according to claim 1, characterized in that: an expansion vessel is connected to the communication pipeline between the gas-liquid separator and the refrigeration compressor, and the inlet channel of the expansion vessel is provided with a pressure The control valve is provided with a one-way valve on the outlet channel. 3. The cold and heat energy utilization system according to claim 2, characterized in that: a liquid receiver is arranged between the condenser and the gas-liquid separator, and the refrigeration compressor and the first-stage heat exchanger An oil collector is arranged between them, and the oil return pipe of the oil collector communicates with the refrigeration compressor. 4. The cold and heat energy utilization system according to claim 3, characterized in that: the condenser is an evaporative condenser, the heat exchanger is a plate heat exchanger and there are two, correspondingly forming two dry room, the drying room is provided with a fan coil, and the heat exchanger is connected with the fan coil. 5. The cooling and heating energy utilization system according to claim 4, characterized in that: there are three cold rooms, and there are three corresponding cooling fans and evaporators. 6. The cold and heat energy utilization system according to claim 5, characterized in that: the communication channel between the oil collector and the compressor, the communication channel between the fan coil unit and the condenser, the gas-liquid separation Valves are arranged on the communication channel between the air conditioner and the regulating station, on the communicating channel between the regulating station and the evaporator, and on the communicating channel between the evaporator and the cooling fan.