TW519562B - A binary-cycle refrigeration system utilizing ejector cooling cycle - Google Patents

Abstract

The present invention is related to a binary-cycle refrigeration system which utilizes an ejector cooling cycle as the bottom cycle of the mechanical-compression cycle. The heat contained in the hot vapor at the exit of the compressor is utilized to power the ejector cooling cycle. The cooling effect generated from the ejector cooling cycle is used to cool the refrigerant liquid condensate in the mechanical-compression cycle to a subcooled state. The coefficient of performance (COP) of the mechanical-compression cycle can thus be improved.

Description

L Creative background China is located in a subtropical region. Due to the rapid economic growth and standard of living g

Raise it, touch the red button coldly, and make money button to solve the problem. Therefore, how to improve the efficiency of the cold air-conditioning system is an important subject and the main object of the present invention. _ In recent years, the government has vigorously promoted ice storage air conditioning systems to use electricity at night |

Silk ice is stored during periods of stress, and Baiguan releases ice to make cold air. I can effectively transfer the electrical load. However, in the ice storage air-conditioning system, in order to make ice, the evaporation temperature of the ice water host must be reduced to _7. Around ((was about 7T), making the ice water patronage rate low. Taking the ―Part_> as an example of the spiral mechanical inspection type ice water host, the cooling capacity is 168kW (145,000 kcal / hr) at the New Zealand temperature%, but when the evaporation temperature drops to -7〇c, the cooling capacity becomes 100kW. (86,000 kcal / hr), a reduction of 41%. The eerer decreased from 3.34 kcal / hW to 2.12 kcal / hW, and the energy efficiency decreased by 37%. It can be seen that the result of using ice storage air conditioning systems is wasting more energy. Printed by the Shell Standard Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economics The ice-cut ice storage air-conditioning system is mainly used to make economic benefits to attract users to transfer peak loads, which is only beneficial to the power generation industry. In fact, it is a low-efficiency, high-energy-consuming device. From the perspective of energy conservation, it should not be encouraged unless its energy efficiency can be improved. Therefore, improving the energy efficiency of an ice storage air conditioning system is an important subject and one of the objects of the present invention. The traditional Lengkang air-conditioning system is designed and operated according to Rankine's thermal cycle. The theoretical analysis of Rankine's thermal cycle can prove that the paper size of the condensate is applicable to the Chinese National Standard (CNS) A4 standard (210X297 mm). 519562 Printed by A7 B7, Shellfish Consumer Cooperative, Central Bureau of Standards, Ministry of Economic Affairs 5. Description of the invention (2) Subcooling can improve the refrigeration performance coefficient (COP) of the refrigerator. As for how to reduce the temperature of the condensate to a subcooled state, it is a question I must consider. On the other hand, it is cooled by a mechanical compression Rankine cycle; the high-pressure high-temperature refrigerant vapor discharged from the compressor in the east air-conditioning system must be released in the condenser to condense into a liquid. This heat is usually discharged to the atmosphere It is not recycled. Therefore, 'how to use the high pressure and high temperature refrigerant vapor waste heat (condenser exhaust heat) discharged by the compressor to cool it and use it to cool the condensate of the mechanical compression refrigerating unit to achieve a supercooled state and improve the mechanical compression cold; The coefficient of performance (COP) is the focus of this work. In view of the lack of conventional technology, the inventor has created the "two-stage circulation refrigeration system using a spray refrigeration cycle" in this case. The main purpose of this project is to equip the ejector CCK ling systemj with a mechanical compression refrigerating unit, so that the injection unit becomes a bottom cycle of the mechanical compression unit. High-temperature gas waste heat to propel the jet unit. It is characterized by the refrigeration effect produced by the jet type unit, which is used to subcool the condensate of the mechanical compression type refrigerating unit, so as to improve the efficiency of the mechanical compression type refrigerating unit, and achieve the purpose of improving the refrigeration performance coefficient (COP). 2 · Detailed description of the creation According to the main purpose of this creation case, the idea is to equip the jet refrigeration unit with a traditional mechanical compression refrigeration unit, and use the high-temperature gas waste heat from the compressor to promote the jet refrigeration unit. ^ IT (Please read the note on the back ^ before filling this page)

519562

The refrigeration effect produced by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs is used to subcool the condensate of mechanical compression refrigeration units to improve the efficiency of mechanical compression refrigeration units and to improve the refrigeration performance coefficient ( cop) purpose. The purpose and concept of this creative proposal will be explained in detail in conjunction with the detailed description of the following embodiments and the attached drawings. First, please refer to FIG. 1, which is a schematic diagram of a system according to a preferred embodiment of the present invention. The figure includes: a mechanical compression refrigerating unit 丨 which is composed of Rankinecycle, including refrigerant compression. Machine u, heat exchanger 31, condenser 12, subcooler 32, expansion valve 13 and evaporator 14; and an injection unit 2, which consists of an ejector 21, a condenser 22, an expansion valve 23, The circulation pump 24, the steam generator 31, and the evaporator 32 are comprised. The mechanical compression type refrigerating unit 1 and the jet type refrigerating unit 2 are connected together through a connection unit 3 including a heat exchanger (or a steam generator) 31 and a subcooler (or an evaporator) 32 to make the jet type unit 2 mechanically compressed. A bottom cycle of the unit. The heat exchanger 31 is the steam generator 31 of the injection type unit 2, and also belongs to the condenser of the mechanical compression type unit 1. It is used to transfer the condensed waste heat of the mechanical compression type unit 1 to the steam in the injection type unit 2. The refrigerant liquid in the generator 31 is heated to evaporate into a vapor. The evaporator 32 of the jet type unit 2 is the subcooler 32 of the mechanical compression type unit 1. It uses the cooling effect of the jet type unit 2 to cool the condensate of the mechanical compression type unit 1 to a supercooled state, and improves Refrigeration performance of the mechanical compression refrigeration unit 1. Please refer to FIG. 2 again, which is a sectional view of the structure of the injector 21 of the injection unit 2. The refrigerant in the jet chiller unit 2 is heated and steamed in the steam generator 31. Please read the precautions on the back side and fill in this page. Order # This paper size applies to China National Standard (CNS) A4 size (210X297 (Mm) Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperative, 519562 A7 ------ B7__ V. Description of the invention (4) High-pressure high-temperature steam 215 is generated, flows into the nozzle 211, gradually expands and accelerates, and exits at the nozzle outlet It is accelerated into a low-pressure supersonic airflow, and the refrigerant vapor 216 flowing out of the evaporator 32 (or subcooler) is drawn. The two airflows are in the mixing chamber 212, and after mixing and momentum exchange, a supersonic mixed airflow is formed. The section 213 generates a shock wave, the pressure rises sharply, and then flows into the diffuser 214 to continue deceleration and pressure increase. Therefore, the refrigerant vapor is compressed from the low-pressure vapor state 216 of the evaporator to the high-pressure state 217 of the outlet, so the ejector 21 itself has a compressor Function, but it does not use mechanical devices to achieve compression, but uses the compressible flow aerodynamics of high-pressure fluid to complete the compression process. That is, spray The condenser is a thermally driven compression component that uses a fluid to perform gas compression, so there are no mechanical moving parts in the structure, so its reliability is also high. The refrigerant vapor 217 flowing out of the ejector 21 then enters the condenser 22 to condense into a liquid A part of it flows into the evaporator 32 through the expansion valve 23, and evaporates and absorbs heat to produce a cooling effect, which is used to cool the condensate of the mechanical compression type unit 1 to a supercooled state, thereby improving the refrigeration performance of the mechanical compression type cold-kill unit 1. The evaporated vapor is sucked in the suction port 218 of the ejector 21. Another part of the condensate flowing out of the condenser 22 is sent back to the steam generator 31 through a circulation pump 24, and continues to be heated and evaporated to complete a thermal cycle. According to the idea of this creative project, the jet refrigeration unit 2 is equipped with the traditional mechanical compression refrigeration unit 1, so that the jet refrigeration unit 2 becomes a bottom cycle of the mechanical compression refrigeration unit j, and the high temperature discharged from the compressor is used. The waste heat of gas is used to propel the jet-type unit, which is characterized by the refrigeration effect produced by the jet-type unit, which is used to supercool the mechanical compression unit. Condensate, in order to improve the efficiency of mechanical compression refrigeration unit, to achieve enhance the cooling performance coefficient I -. (Read the back of the precautions to fill out this page), 1Τ

519562 A7

(COP) purpose. According to the idea of this creative case, the mechanical compression refrigerating unit 1 and the jet refrigerating unit 2 are two independent thermal cycle units, which can be operated with different refrigerants, so even The failure of the jet refrigeration unit 2 does not affect the operation of the mechanical compression refrigeration unit 1. For the convenience of application, the spray refrigeration unit 2 and the connection unit 3 including a heat exchanger (or a steam generator) 31 and a subcooler (or an evaporator) 32 can be made into a separate body to directly connect the mechanical compression type cooling Cambodian unit 1. If this proposal is applied to an ice storage air-conditioning system, the evaporator 14 and the ice storage tank 15 in the mechanical compression refrigerating unit 1 may be designed as a whole. If it is applied to a general air-conditioning system, the evaporator 14 can be designed in unison with the ice-water circulation system. Therefore, this creative case has a lot of application space. In order to verify the idea of this creation, the inventor produced a small "two-stage refrigeration system using a jet refrigeration cycle" according to the flow chart in Fig. 1 for actual testing. The mechanical compression refrigeration unit uses R22 refrigerant compressor, and the injection unit 2 uses R141b as the refrigerant. Measure the refrigeration capacity and total input power (including the energy consumption of the circulating pump) of the dual-cycle system (this creation) and the traditional single compressor system at different evaporation temperatures. The refrigeration performance factor COP of the system can be measured and compared. Table 1 shows the preliminary test results, showing that this creation can indeed improve the cooling performance and achieve energy saving effects. In fact, there is still much room for improvement in the performance of jet-type units. The cooling performance coefficient COP of the dual-cycle system of this creation can be increased by more than 15%. The size of this paper is applicable to China National Standard (CNS) A4 (21〇χ 297 public envy) (Please read the notes on the back first and fill in this purchase)

1T 519562 A7 B7 Description of the invention (6) Table 1 Evaporation temperature of compressor unit cooling 0 Qc cW) Total system input work w_ (kW) COP PQc / wj CC) Single compressor system dual cycle system Single compressor system double loop SystemSingle compressor systemDouble cycle system-5 2.82 3.03-1.59 1.61 1.77 1.88 -4 3.11 3.35 1.63 1.65 1.91 ~ Z03 -3 3.38 3.59 1.68 1.70 2.01 2.11 The "Lee Shi shot cold; two-stage circulation cold Kang system of the east cycle", the jet cold Lai to Yan mechanical compression cold Lai group, the use of high-temperature gas discharged from the compressor to eject the shaft, its characteristics are The cold effect produced by the jet type unit is used to subcool the condensate of the mechanical compression type unit to improve the efficiency of the mechanical compression type cooling unit and achieve the purpose of improving the refrigeration performance coefficient (COP). It has also been verified by practice. , Which has a wide range of uses, can improve the storage efficiency of the ice storage system or the general cold shirt adjustment system. ", In line with the requirements of turning hate, according to the law I'r installed-(Please read the precautions on the back before (Fill in this page)

Brief description of the 1T application drawings: Printed by the Zhengong Consumer Cooperative of the Central Bureau of Quasi-Ministry of Economic Affairs. Description of circle number:: Mechanical compression type cold image unit uses Chinese National Standard (CNS) A4 specifications (2ΐϋ297mm f) Printed by the Central Consumers Bureau of the Ministry of Economic Affairs, Beige Consumer Cooperative, 519562 A7 B7 V. Description of invention (7) 11: Compression Machine 12: condenser 13: expansion valve 14: evaporator 15: ice storage tank 16: cooling water 2: jet refrigeration unit 21: ejector 211: nozzle 212: mixing cavity 213: equal section area 214: diffuser 215: High-pressure main steam flow 216: suction flow 217: mixed compression flow 218: ejector suction port 219: suction chamber 22: condenser 23: expansion valve 24: circulation pump 25: cooling water 3: connection unit 31: heat transfer (Or steam generator of jet type unit) 32: Subcooler (or evaporator of jet type unit) This paper size applies to China National Standard (CNS) A4 (210X297 mm) (Please read the note on the back first) (Fill in this page again)

Claims (1)

519 1 025 09 A8 B8 C8 D8 The Central Standards Bureau of the Ministry of Economic Affairs printed and applied for industrial and consumer cooperatives, and the scope of patent application (1) 1 · A two-stage circulation refrigeration system using a spray refrigeration cycle, equipped with a spray refrigeration unit The mechanical compression cold rolling unit makes the jet cold rolling unit a bottom cycle of the mechanical compression refrigerating unit. It uses the high pressure and high temperature gas waste heat from the compressor to promote the jet refrigeration unit. It is characterized by the The refrigeration effect is used to subcool the condensate of a mechanical compression refrigerating unit to improve the efficiency of the mechanical compression refrigerating unit. 2. The two-stage circulation refrigeration system using a jet refrigeration cycle as described in item 1 of the scope of the patent application, wherein the mechanical compression refrigeration unit and the jet refrigeration unit constitute a dual-cycle refrigeration system through a connection unit. The connection unit includes: (a) a heat exchanger, which is a steam generator of the jet refrigeration unit and a part of the condenser of the mechanical compression refrigeration unit, which is used to discharge the high temperature of the compressor of the mechanical compression refrigeration unit The gas condensed waste heat is transmitted to the refrigerant liquid in the steam generator in the jet refrigeration unit and is heated to evaporate into vapor; (b) —Subcooler, which is also the evaporator of the jet refrigeration unit, it will jet the refrigeration unit The cooling effect is used to cool the condensate of the mechanical compression refrigerating unit to achieve a supercooled state, and improve the refrigeration performance of the mechanical compression refrigerating unit. 3. As described in item 1 of the scope of the patent application, a two-stage circulation refrigeration system using a jet refrigeration cycle, in which the mechanical compression refrigeration unit and the jet refrigeration unit are two independent thermal cycle units, which can be operated with different refrigerants . This paper size applies to China National Standards (CNS) A4 scale (210X297 mm) (Please read the note on the back ^ before filling this page) Order