阅读说明：本技术 蓄冷式过冷跨临界集成co2制冷系统 (Cold storage supercooling Trans-critical cycle integrates CO2Refrigeration system ) 是由 代宝民 漆乐 杨茜茹 马牧宇 郭梦迪 王璐 何小敏 杨和澄 于 2019-09-05 设计创作，主要内容包括：本发明公开了一种蓄冷式过冷跨临界集成CO_2制冷系统。本发明由冷水过冷蓄冷循环系统和跨临界集成CO_2制冷循环系统耦合组成；所述跨临界集成CO_2制冷循环系统包括低温级压缩机、中温级压缩机、热回收装置、气体冷却器、节流阀、空调用蒸发器、气液分离器、冷藏室蒸发器、冷冻室蒸发器；冷水过冷蓄冷循环系统由过冷器、蒸发器、水箱、水泵、工质泵、节流阀和三通阀组成。通过冷水对CO_2进行过冷,可降低节流损失,提高系统整体能效。同时,利用热回收满足生活热水供应和采暖,将空调集成到CO_2增压系统中,实现空调和供热一体化,缩小设备体积。夏天开启空调用蒸发器实现制冷,冬天利用二级回收热实现房间采暖。(The invention discloses a kind of cold storage supercooling Trans-critical cycles to integrate CO 2 Refrigeration system.Charge cycle system is subcooled by cold water by the present invention and Trans-critical cycle integrates CO 2 Cooling cycle system coupling composition；The Trans-critical cycle integrates CO 2 Cooling cycle system includes low-temperature level compressor, medium temperature grade compressor, heat recovery apparatus, gas cooler, throttle valve, evaporator using for air, gas-liquid separator, refrigerator evaporator, freezer evaporator；Cold water supercooling charge cycle system is made of subcooler, evaporator, water tank, water pump, working medium pump, throttle valve and triple valve.By cold water to CO 2 It is subcooled, restriction loss can be reduced, improve system entirety efficiency.Meanwhile meeting domestic hot-water supply and heating using recuperation of heat, air-conditioning is integrated into CO 2 In pressure charging system, realizes air-conditioning and supply heating integrated, diminution equipment volume.Summer opens evaporator using for air and realizes refrigeration, and winter realizes room heating using secondary recovery heat.)

1. a kind of cold storage supercooling Trans-critical cycle integrates CO₂Refrigeration system, which is characterized in that the circulatory system is followed by cold water supercooling cold-storage Loop system and Trans-critical cycle integrate CO₂Cooling cycle system coupling composition；The Trans-critical cycle integrates CO₂Cooling cycle system includes low Warm grade compressor, medium temperature grade compressor, heat recovery apparatus, gas cooler, throttle valve, evaporator using for air, gas-liquid separator, Refrigerator evaporator, freezer evaporator；The medium temperature stage compressor outlet is connected with heat recovery apparatus entrance, heat recovery apparatus Outlet is connected with gas cooler entrance, and gas cooler outlet is connected with high-temperature level throttling valve inlet, and high-temperature level throttle valve goes out Mouthful be connected with evaporator using for air, evaporator using for air outlet elder generation via after gas-liquid separator respectively with by-passing valve, medium temperature throttling Valve is connected with cryogenic throttle valve；The bypass valve outlet is connected with medium temperature suction port of compressor；Medium temperature throttling valve outlet with it is cold It hides room evaporator inlet to be connected, refrigerator evaporator outlet is connected with medium temperature suction port of compressor；Cryogenic throttle valve outlet with Freezer evaporator entrance is connected, and freezer evaporator outlet is connected with low-temperature level suction port of compressor, low temperature stage compressor outlet It is connected with medium temperature grade suction port of compressor；

The cold water supercooling charge cycle system is by subcooler, evaporator, water tank, water pump, working medium pump, throttle valve and threeway valve group At；The tank outlet is connected with pump entrance, and exit of pump is connected with subcooler entrance, subcooler outlet and tank entry phase Even, the exit of pump is connected with evaporator inlet, and evaporator outlet is connected with tank entry；The evaporator outlet and gas-liquid Separator inlet is connected, and gas-liquid separator outlet is connected with working medium pump, and the working medium pump discharge is connected with throttling valve inlet, throttles Valve outlet is connected with evaporator inlet.

2. cold storage supercooling Trans-critical cycle according to claim 1 integrates CO₂Refrigeration system, which is characterized in that the evaporator It is counter-flow heat exchanger with subcooler.

3. cold storage supercooling Trans-critical cycle according to claim 1 integrates CO₂Refrigeration system, which is characterized in that Trans-critical cycle is integrated CO₂Refrigeration cycle refrigerant uses natural refrigerant CO₂, it is cold water that charge cycle working medium, which is subcooled, in cold water.

Technical field

The present invention relates to refrigeration technology fields, integrate CO more particularly to a kind of cold storage supercooling Trans-critical cycle₂Refrigeration system.

Background technique

As global warming, ozone layer such as are destroyed at the increasingly prominent of environmental problems, there is destruction to ozone layer to substitute The working medium such as effect and CFCs, HCFCs, HFCs for generating greenhouse effects, the natural refrigerants for finding novel close friend become system The research emphasis of cold field of air conditioning.Wherein, CO₂Due to advantages such as nontoxic non-combustible, safety and environmental protections, the generally pass of people is caused Note.

But due to CO₂Lower critical-temperature and higher critical pressure, make that its restriction loss is big, refrigerating efficiency is lower, Especially when environment temperature is higher, CO₂Refrigerating capacity sharply decline.If to the CO of gas cooler outlet₂Fluid carried out Cold, with the increase of degree of supercooling, restriction loss is reduced, and circulation cooling capacity increases, and circulation COP is promoted.CO₂The mistake of refrigeration cycle It is cold to be realized by modes such as internal exchanger, mechanical super cooling, thermoelectricity supercoolings.The refrigeration duty for surpassing field refrigeration system for quotient is white It is much larger than night, and electricity price on daytime is higher than night, extra cooling capacity is stored in water tank cold water at night, daytime passes through cold water To CO₂Refrigeration system is subcooled, and can not only increase refrigerating capacity by supercooling, and can reduce Compressor Discharge Pressure, Extend the service life of compressor, improve refrigeration system entirety efficiency, reduces the electricity charge.For supermarket, megastore, in sales field The food such as vegetables, beverage, milk, meat, which need to refrigerate or freeze, carries out fresh-keeping/preservation, needs to guarantee Shang Chaojian in winter and summer Build internal suitable thermal comfort.It is also required to provide daily life hot water for customer and market employee in the super building of quotient.Therefore, Large-scale shopping mall supermarket is built, needs to meet freezing, refrigeration, for a variety of hot-cool demands of cold heat and domestic hot-water.Such as Fruit hot-cool demand independently supplying not only results in cold and hot energy waste, and equipment is various, occupied space.

Summary of the invention

Present invention aims to overcome that above-mentioned the deficiencies in the prior art, provide a kind of cold storage supercooling Trans-critical cycle collection At CO₂Refrigeration system.

The cold storage supercooling Trans-critical cycle of the present invention integrates CO₂Charge cycle system is subcooled by cold water in the refrigeration system circulatory system CO is integrated with Trans-critical cycle₂Cooling cycle system coupling composition；The Trans-critical cycle integrates CO₂Cooling cycle system includes low-temperature level pressure Contracting machine, medium temperature grade compressor, heat recovery apparatus, gas cooler, throttle valve, evaporator using for air, gas-liquid separator, refrigerating chamber Evaporator, freezer evaporator；The medium temperature stage compressor outlet is connected with heat recovery apparatus entrance, heat recovery apparatus outlet with Gas cooler entrance is connected, and gas cooler outlet is connected with high-temperature level throttling valve inlet, high-temperature level throttling valve outlet and sky Call evaporator to be connected, evaporator using for air outlet first via after gas-liquid separator respectively with by-passing valve, medium temperature throttle valve and low Warm throttle valve is connected；The bypass valve outlet is connected with medium temperature suction port of compressor；The medium temperature throttling valve outlet and refrigerating chamber steam It sends out device entrance to be connected, refrigerator evaporator outlet is connected with medium temperature suction port of compressor；The cryogenic throttle valve outlet and freezing chamber Evaporator inlet is connected, and freezer evaporator outlet is connected with low-temperature level suction port of compressor, low temperature stage compressor outlet and medium temperature Grade suction port of compressor is connected；

The cold water supercooling charge cycle system is by subcooler, evaporator, water tank, water pump, working medium pump, throttle valve and threeway Valve group at；The tank outlet is connected with pump entrance, and exit of pump is connected with subcooler entrance, and subcooler outlet enters with water tank Mouth is connected, and the exit of pump is connected with evaporator inlet, and evaporator outlet is connected with tank entry；The evaporator outlet with Gas-liquid separator entrance is connected, and gas-liquid separator outlet is connected with working medium pump, and the working medium pump discharge is connected with throttling valve inlet, Throttling valve outlet is connected with evaporator inlet.

Summer integrates CO with Trans-critical cycle₂Cooling cycle system, the refrigeration that low-temperature level compressor exports freezer evaporator Agent is compressed into medium temperature and medium pressure grade evaporating pressure, comes with the medium temperature and medium pressure saturated gas and bypass of refrigerator evaporator outlet Middle benefit gas enters medium temperature grade compressor after pressing saturated gas mixing.Gas is compressed into high temperature and high pressure gas, into level-one recuperation of heat Device recycles heat tap water to provide domestic hot-water, enters back into gas cooler and air heat-exchange later.Gas cooling The fluid of device outlet first throttles through high-temperature level throttle valve, enters evaporator using for air later, and medium temperature and medium pressure gas-liquid two-phase fluid exists Room refrigeration is realized in A/C evaporator evaporation, and gas-liquid two-phase fluid enters in gas-liquid separator, and gas is realized in gas-liquid separator Liquid separation, liquid pass through in mild low-temperature level throttle valve throttled respectively to medium temperature and low-temperature level cooling evaporator, and respectively in institute Evaporation in evaporator is stated, after heat absorption evaporation, working medium all becomes saturated air, into respectively enteing low temperature and medium temperature grade compressor carries out Compression.Gas enters medium temperature grade compressor by bypass, and completion summer integrates CO with Trans-critical cycle₂Refrigeration cycle.

Winter integrates CO with Trans-critical cycle₂Cooling cycle system, the refrigeration that low-temperature level compressor exports freezer evaporator Agent is compressed into medium temperature and medium pressure grade evaporating pressure, comes with the medium temperature and medium pressure saturated gas and bypass of refrigerator evaporator outlet Middle benefit gas enters medium temperature grade compressor after pressing saturated gas mixing.Gas is compressed into high temperature and high pressure gas, is introduced into level-one heat and returns Receiving apparatus recycles heat tap water to provide domestic hot-water, and second level heat recovery apparatus is for heating system return Rooms enter back into gas cooler and air heat-exchange later.The fluid of gas cooler outlet is first through high-temperature level throttle valve Throttling, gas-liquid two-phase fluid enters in gas-liquid separator later, and gas-liquid separation is realized in gas-liquid separator, and liquid passes through medium temperature It is throttled respectively with low-temperature level throttle valve to medium temperature and low-temperature level cooling evaporator, and is evaporated in the evaporator respectively, absorbed heat After evaporation, working medium all becomes saturated air, into respectively enteing low temperature and medium temperature grade compressor is compressed.Gas by bypass into Enter medium temperature grade compressor, completion winter integrates CO with Trans-critical cycle₂Refrigeration cycle.

The advantages and positive effects of the present invention are:

(1)CO₂The refrigerant of refrigeration system is natural refrigerant CO₂。CO₂GWP be 1, ODP 0, it is safe and non-toxic it is non-combustible, It is cheap easily to obtain, do not decompose generation pernicious gas under the high temperature conditions, supercooling cycle fluid is water, and refrigerant used in system is equal yet For environmental-friendly refrigerant.

(2) daylight environment temperature is high and refrigeration duty is big, and electricity price is high；Night environment temperature is low and refrigeration duty is small, and electricity price is cheap. Night can spend a small amount of electricity charge that extra cooling capacity is stored in water tank cold water, and daytime exports CO to gas cooler by cold water₂ Fluid is subcooled, and system entirety efficiency is improved, and reduces high price on daytime electric consumption, improves system whole synthesis efficiency and economy Property.

(3) the integrated CO of Trans-critical cycle can be increased by crossing cooling system by increase cold water cold-storage₂The rated cooling capacity of refrigeration system, subtracts The investment of equipment of mini system.

(4) cooling system is crossed to CO by cold water cold-storage₂The CO of system gas cooler outlet₂Carrying out supercooling reduces compressor Pressure at expulsion extends the service life of compressor, reduces operating cost, is lowered into CO before expansion valve₂Temperature reduces expansion damage It loses, and further decreases CO₂Run high pressure.

(5) by using two heat recovery apparatuses, domestic hot-water supply and winter room heating are realized, reduces whole set It is standby, to reduce heating cost.

(6) by increasing evaporator using for air, summer room refrigeration is realized, to reduce air-conditioning cost.

Detailed description of the invention

Fig. 1 is that the cold storage supercooling Trans-critical cycle of the present invention integrates CO₂The schematic diagram of refrigeration system.

Specific embodiment

The present invention will be further described with reference to the accompanying drawing.

As shown in Figure 1, the present invention includes the cold water cold-storage supercooling circulatory system and CO₂Trans-critical cycle cooling cycle system.

Summer embodiment: CO₂12 absorption refrigerating evaporator of Trans-critical cycle refrigeration cycle low-temperature level compressor, 11 exit Low-temperature low-pressure refrigerant, compress it into the overheated gas of medium temperature and medium pressure, with refrigerator evaporator 9 export saturated gas And enter medium temperature grade compressor 1 after the saturated gas mixing of the outlet of by-passing valve 7, it is compressed into high temperature and high pressure gas, into level-one heat Recyclable device 2, level-one recycling heat enter back into gas cooler 4 and air heat-exchange for heating domestic water.Refrigerant is logical later High-temperature level throttle valve 5 is crossed, is evaporated into evaporator using for air 6, room refrigeration is realized, enters back into gas-liquid separator 13, pass through all the way Crossing by-passing valve 7 becomes the saturated gas of medium temperature and medium pressure, absorbs the heat of refrigerating chamber after 8 expansion throttling of medium temperature grade throttle valve all the way Quantitative change is the saturated gas of medium temperature and medium pressure, and the heat of another way absorption refrigerating after 10 expansion throttling of low-temperature level throttle valve becomes For the saturated gas of low-temp low-pressure.

Winter embodiment: CO₂12 absorption refrigerating evaporator of Trans-critical cycle refrigeration cycle low-temperature level compressor, 11 exit Low-temperature low-pressure refrigerant, compress it into the overheated gas of medium temperature and medium pressure, with refrigerator evaporator 9 export saturated gas And enter medium temperature grade compressor 1 after the saturated gas mixing of the outlet of by-passing valve 7, it is compressed into high temperature and high pressure gas, into level-one heat Recyclable device 2, level-one recycling heat enter back into second level heat recovery apparatus 3, recycling heat is adopted for room for heating domestic water It is warm, enter back into gas cooler 4 and air heat-exchange.Refrigerant passes through high-temperature level after pipeline by the way that working medium triple valve 14 is arranged Throttle valve 5 enters back into gas-liquid separator 13, becomes the saturated gas of medium temperature and medium pressure by by-passing valve 7 all the way, passes through medium temperature all the way The heat that refrigerating chamber is absorbed after grade 8 expansion throttling of throttle valve becomes the saturated gas of medium temperature and medium pressure, and another way passes through low-temperature level section The heat of absorption refrigerating becomes the saturated gas of low-temp low-pressure after stream 10 expansion throttling of valve.

Cold water charge cycle: daytime opens subcooler, closes evaporator.Water pump 18 passes through cold water from the setting of water tank 17 The pipeline of cold water triple valve 19 is sent to subcooler 15, with CO₂It exchanges heat, completes cold water on daytime and cross SAPMAC method.It opens at night Evaporator closes subcooler.Cold water is sent to cold water charge cycle evaporator 16 from water tank 17 by water pump 18, and working medium and water carry out Heat exchange, completes evening cold water charge cycle, and working medium pump 21 is by CO₂Force feed return-air liquid/gas separator 13.

Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited to upper The specific embodiment stated, the above mentioned embodiment is only schematical, be not it is restrictive, this field it is common Technical staff under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, may be used also By make it is many in the form of, within these are all belonged to the scope of protection of the present invention.