Energy-saving high-precision cascade rapid temperature regulating system for enthalpy-difference laboratory

Abstract

The application discloses an energy-saving high-precision cascade rapid temperature regulating system for an enthalpy difference laboratory, and relates to the field of refrigeration and temperature regulation; the system comprises a first circulating system composed of a first condenser, a second evaporator, a first evaporator and a heat pump compression mechanism; a second circulating system composed of a second condenser, a third evaporator, a cooling tower and a refrigeration compression mechanism; heat absorption on the outdoor side through the first circulating system and heat release on the indoor side through the second circulating system, so that the energy-saving and rapid temperature regulating purposes are achieved; and through the most refrigerant flow path, the indoor side and the outdoor side of the enthalpy difference laboratory are rapidly and accurately regulated in temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration and temperature control, in particular to an energy-saving high-precision cascade rapid temperature control system for enthalpy difference laboratory. BACKGROUND

[0002] The enthalpy difference laboratory for communication machine room air conditioner is a laboratory for testing the performance of the machine room air conditioner by using the enthalpy difference method. Various test conditions are artificially created on the indoor side and the outdoor side of the laboratory to simulate the operating environment of the machine room air conditioner, verify the performance, operating stability of the new product of the machine room air conditioner, and determine the parameters under extreme conditions.

[0003] In the traditional enthalpy difference laboratory, the environment control systems on the indoor side and the outdoor side are independent. Each room is equipped with independent compressors, evaporators, condensers, electric heaters, humidifiers, etc. During testing, the indoor side and the outdoor side are adjusted to the test conditions separately according to the test requirements.

[0004] However, the existing system has the following disadvantages:

[0005] Before starting the test, the indoor side and the outdoor side need to be adjusted to the test conditions separately according to the test requirements. Sometimes one side needs to be heated, while the other side needs to be cooled. The indoor and outdoor systems cannot exchange heat, resulting in waste of electric energy. It not only fails to achieve energy saving, but also cannot shorten the temperature control time.

[0006] The machine room air conditioner only cools, and does not heat. Therefore, the load of the air conditioner laboratory has the characteristics of a heat pump, i.e. the indoor side is always in a cooling state, and the outdoor side is always in a heat releasing state. The traditional system simply discharges the heat energy of the outdoor side to the environment through the cooling tower, and the indoor side absorbs heat from the environment through the evaporation system. The two systems cannot exchange heat, resulting in high energy consumption and resource waste of the enthalpy difference laboratory. SUMMARY

[0007] The purpose of the present application is to provide an energy-saving high-precision cascade rapid temperature control system for enthalpy difference laboratory, which can realize the exchange of heat between the indoor and outdoor sides.

[0008] To achieve the above purpose, the present application provides the following scheme:

[0009] An energy-saving high-precision cascade rapid temperature control system for enthalpy difference laboratory, the system comprises: an indoor side, an outdoor side, a measured unit outdoor unit, a measured unit indoor unit, a heat pump compressor, a refrigeration compressor, a first condenser, a second condenser, a first evaporator, a second evaporator, a third evaporator and a cooling tower.

[0010] The first condenser, the second evaporator, the first evaporator and the heat pump compressor constitute a first circulation system; the second condenser, the third evaporator, the cooling tower and the refrigeration compressor constitute a second circulation system;

[0011] The measured unit indoor unit, the first condenser and the second condenser are arranged in the interior of the indoor side;

[0012] The measured unit outdoor unit, the second evaporator and the third evaporator are arranged in the interior of the outdoor side;

[0013] The outdoor side is located on one side of the indoor side;

[0014] The heat pump compressor and the first evaporator are arranged in the exterior of the indoor side;

[0015] The refrigeration compressor and the cooling tower are arranged in the exterior of the outdoor side;

[0016] The output end of the heat pump compressor is connected with the input end of the first condenser; the input end of the first evaporator is connected with the output end of the first condenser and the output end of the second evaporator respectively; the output end of the first condenser is further connected with the input end of the second evaporator; the output end of the first evaporator is connected with the input end of the heat pump compressor; the cooling refrigerant output end of the refrigeration compressor is connected with the input end of the third evaporator; the output end of the third evaporator is connected with the refrigerant input end of the refrigeration compressor; the cooling water output end of the refrigeration compressor is connected with the input end of the second condenser and the input end of the cooling tower respectively; the output end of the second condenser is connected with the input end of the cooling tower; the output end of the cooling tower is connected with the cooling water input end of the refrigeration compressor.

[0017] Optionally, the input end of the first evaporator is connected with the output end of the first condenser and the output end of the second evaporator through a first three-way proportional valve respectively.

[0018] Optionally, the cooling water output end of the refrigeration compressor is connected with the input end of the second condenser and the input end of the cooling tower through a second three-way proportional valve respectively.

[0019] Optionally, the output end of the second condenser is connected with the input end of the cooling tower through a second three-way proportional valve.

[0020] Optionally, the energy-saving high-precision cascade rapid temperature regulating system for the enthalpy difference laboratory further comprises a controller.

[0021] The controller is connected with control ends of the heat pump compressor, the first condenser, the second evaporator, the first evaporator, the third evaporator, the second condenser, the refrigeration compressor, the second three-way proportional valve, the first three-way proportional valve and the cooling tower respectively.

[0022] The controller is used for adjusting the heat pump compressor, the refrigeration compressor, the first condenser, the second evaporator, the first evaporator, the third evaporator, the second condenser, the second three-way proportional valve, the first three-way proportional valve and the cooling tower by PID algorithm according to current indoor temperature and humidity and current outdoor temperature and humidity, so that the set indoor temperature and humidity is consistent with the working condition temperature and humidity.

[0023] Optionally, when the indoor temperature needs to be raised and the outdoor temperature needs to be lowered, the first circulation system and the second circulation system operate simultaneously.

[0024] The first circulation system specifically operates as follows:

[0025] The controller controls the first condenser to release heat to the indoor side based on superheated refrigerant, so as to raise the indoor temperature, and the controller controls the first three-way proportional valve to transmit the subcooled refrigerant to the second evaporator and the first evaporator respectively.

[0026] The controller controls the second evaporator to release heat to the subcooled refrigerant after absorbing heat from the outdoor side, and then transmits the superheated refrigerant to the first evaporator.

[0027] The controller controls the first evaporator to release heat to the superheated refrigerant and the subcooled refrigerant after absorbing energy from the indoor side, and then transmits the superheated refrigerant to the heat pump compressor.

[0028] The controller controls the heat pump compressor to output the superheated refrigerant to the first condenser, and then the controller controls the first condenser to absorb heat from the superheated refrigerant, and then the controller controls the first three-way proportional valve to transmit the subcooled refrigerant to the second evaporator and the first evaporator respectively.

[0029] The second circulation system specifically operates as follows:

[0030] The controller controls the refrigeration compressor to operate, and the generated refrigerant is transmitted to the third evaporator after being cooled by cooling water.

[0031] The third evaporator releases heat based on the subcooled refrigerant, so as to lower the outdoor temperature, and then transmits the superheated refrigerant to the refrigerant input end of the refrigeration compressor.

[0032] The second three-way proportional valve is controlled based on the controller, and the refrigeration compressor transmits the superheated cooling water to the second condenser through the second three-way proportional valve;

[0033] The second condenser releases heat to the indoor side based on the superheated cooling water, warms the indoor side, and transmits the subcooled cooling water to the cooling tower;

[0034] The cooling tower absorbs heat from the subcooled cooling water, and transmits the subcooled cooling water to the refrigeration compressor; the controller controls the refrigeration compressor to operate, and the generated refrigerant is cooled by the cooling water and then transmitted to the third evaporator.

[0035] Optionally, a water pump and a blowdown port are arranged between the output end of the cooling tower and the cooling water input end of the refrigeration compressor.

[0036] According to the specific embodiments of the present application, the following technical effects are provided:

[0037] The energy-saving high-precision cascade rapid temperature regulating system for the enthalpy difference laboratory disclosed in the embodiment of the present application comprises a first circulating system composed of a first condenser, a second evaporator, a first evaporator and a heat pump compression mechanism; and a second circulating system composed of a second condenser, a third evaporator, a cooling tower and a refrigeration compression mechanism. The first circulating system absorbs heat from the outdoor side, and the second circulating system releases heat to the indoor side, so that the purpose of energy saving and rapid temperature regulating is achieved. At the same time, through the most refrigerant flow path, the indoor side and the outdoor side of the enthalpy difference laboratory are rapidly and accurately regulated. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0039] Figure 1 The structure diagram of the energy-saving high-precision cascade rapid temperature regulating system for the enthalpy difference laboratory in the embodiment of the present application;

[0040] Figure 2 The control flow chart of the energy-saving high-precision cascade rapid temperature regulating system for the enthalpy difference laboratory in the embodiment of the present application using the PID algorithm.

[0041] SYMBOL EXPLANATION:

[0042] 1. Outdoor side; 2. Indoor side; 3. Outdoor unit of the unit under test; 4. Third evaporator; 5. Second evaporator; 6. Refrigeration compressor; 7. Second three-way proportional valve; 8. Water pump; 9. Two-way proportional valve; 10. Cooling tower; 11. First three-way proportional valve; 12. First evaporator; 13. Heat pump compressor; 14. First condenser; 15. Second condenser; 16. Indoor unit of the unit under test. Detailed Implementation

[0043] 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, and 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.

[0044] like Figure 1 As shown, an energy-saving high-precision cascaded rapid temperature control system for laboratory use with enthalpy difference is disclosed. The system includes: an indoor unit 2, an outdoor unit 1, an outdoor unit 3 of the unit under test, an indoor unit 16 of the unit under test, a heat pump compressor 13, a refrigeration compressor 6, a first condenser 14, a second condenser 15, a first evaporator 12, a second evaporator 5, a third evaporator 4, and a cooling tower 10.

[0045] The first condenser 14, the second evaporator 5, the first evaporator 12 and the heat pump compressor 13 constitute a first circulation system; the second condenser 15, the third evaporator 4, the cooling tower 10 and the refrigeration compressor 6 constitute a second circulation system.

[0046] The indoor unit 16 of the tested unit, the first condenser 14, and the second condenser 15 are located inside the indoor side 2.

[0047] The outdoor unit 3 of the tested unit, the second evaporator 5 and the third evaporator 4 are located inside the outdoor side 1.

[0048] The outdoor side 1 is located on one side of the indoor side 2.

[0049] The heat pump compressor 13 and the first evaporator 12 are located outside the indoor side 2.

[0050] The refrigeration compressor 6 and the cooling tower 10 are located outside the outdoor side 1.

[0051] The output end of the heat pump compressor 13 is connected to the input end of the first condenser 14; the input end of the first evaporator 12 is connected to the output end of the first condenser 14 and the output end of the second evaporator 5, respectively; the output end of the first condenser 14 is also connected to the input end of the second evaporator 5; the output end of the first evaporator 12 is connected to the input end of the heat pump compressor 13; the cooling refrigerant output end of the refrigeration compressor 6 is connected to the input end of the third evaporator 4; the output end of the third evaporator 4 is connected to the refrigerant input end of the refrigeration compressor 6; the cooling water output end of the refrigeration compressor 6 is connected to the input end of the second condenser 15 and the input end of the cooling tower 10, respectively; the output end of the second condenser 15 is connected to the input end of the cooling tower 10; the output end of the cooling tower 10 is connected to the cooling water input end of the refrigeration compressor 6.

[0052] like Figure 1 As shown, in a specific application, the outdoor evaporator assembly includes a second evaporator 5 and a third evaporator 4; the indoor condenser assembly includes a first condenser 14 and a second condenser 15. The output end of the first condenser 14 is connected to the input ends of the second evaporator 5 and the first evaporator 12 respectively via a first three-way proportional valve 11; the output end of the second evaporator 5 is connected to the input end of the first evaporator 12; the input end of the third evaporator 4 is connected to the cooling refrigerant output end of the refrigeration compressor 6; the output end of the third evaporator 4 is connected to the superheated refrigerant input end of the refrigeration compressor 6; the input end of the first condenser 14 is connected to the output end of the heat pump compressor 13; the output end of the second condenser 15 is connected to the input end of the cooling tower 10 via a second three-way proportional valve 7; the input end of the second condenser 15 is connected to the cooling water output end of the refrigeration compressor 6 via a second three-way proportional valve 7.

[0053] like Figure 1 As shown, at the beginning of the test, the indoor side 2 and outdoor side 1 of the enthalpy difference laboratory need to be adjusted to the specified operating temperature according to the test requirements. The indoor side 2 consists of a heat pump compressor 13, a first condenser 14, a second condenser 15, a first evaporator 12, and a first three-way proportional valve 11, wherein the heat pump compressor 13 and the first evaporator 12 are not located in the indoor side 2 room; the outdoor side 1 consists of a refrigeration compressor 6, a cooling tower 10, a water pump 8, an electric heater, a second evaporator 5, a third evaporator 4, a second three-way proportional valve 7, and a two-way proportional valve 9, wherein the refrigeration compressor 6, the water pump 8, and the cooling tower 10 are not located in the outdoor side 1.

[0054] In one specific embodiment, the input end of the first evaporator 12 is connected to the output end of the first condenser 14 and the output end of the second evaporator 5 respectively through the first three-way proportional valve 11.

[0055] In one specific embodiment, the cooling water output end of the refrigeration compressor 6 is connected to the input end of the second condenser 15 and the input end of the cooling tower 10 respectively through the second three-way proportional valve 7.

[0056] In one specific embodiment, the output end of the second condenser 15 is connected to the input end of the cooling tower 10 through a second three-way proportional valve 7.

[0057] The energy-saving enthalpy difference laboratory high-precision cascaded rapid temperature control system also includes a controller.

[0058] The controller is connected to the control terminals of the heat pump compressor 13, the first condenser 14, the second evaporator 5, the first evaporator 12, the third evaporator 4, the second condenser 15, the refrigeration compressor 6, the second three-way proportional valve 7, the first three-way proportional valve 11, and the cooling tower 10, respectively.

[0059] The controller is used to adjust the heat pump compressor 13, the refrigeration compressor 6, the first condenser 14, the second evaporator 5, the first evaporator 12, the third evaporator 4, the second condenser 15, the second three-way proportional valve 7, the first three-way proportional valve 11, and the cooling tower 10 according to the current indoor temperature and humidity and the current outdoor temperature and humidity, so that the set indoor temperature and humidity are consistent with the operating temperature and humidity.

[0060] like Figure 2 As shown, taking temperature as an example, the outdoor evaporator group, indoor condenser group, and heat exchanger are adjusted using a PID algorithm. First, the set temperature, current indoor temperature, and current outdoor temperature are obtained. The adjusted temperature is calculated based on these three temperatures. Then, the percentage of cooling demand calculated in the k-th calculation is obtained using the PID algorithm. The compressor speed of the refrigeration compressor 6 and / or the compressor speed of the heat pump compressor 13 are adjusted based on this percentage, thereby adjusting the evaporator fan speed and / or the condenser fan speed. The flow rate is then adjusted by regulating the second three-way proportional valve 7 and / or the first three-way proportional valve 11. Temperature is then detected, and the percentage of cooling demand calculated in the k-th calculation is obtained using the PID algorithm. This process continues until the percentage of cooling demand is less than the preset percentage, at which point the indoor temperature and humidity are set to match the operating temperature. The calculation and control method for humidity is the same as that for temperature.

[0061] The PID algorithm is as follows:

[0062] u(k)=Kp*e(k)*K i *∑[e(0)…e(k)+Kd*[e(k)-e(k-0)];

[0063] Δu(k)=u(k)-u(k-1)=KP*[ee(k)-e(k-1)]+Ki*e(k)+Kd*

[0064] [e(k)-2*e(k-1)+e(k-1)];

[0065] u(k) = u(k-1) + Δu(k);

[0066] u(k)=Kp*e(k)+K i +Σ[e(0)…e(k-1)]+K i +e(k)+Kd+

[0067] [e(k)-e(k-1)];

[0068] Where, k = 0, 1, 2… sampling number; e(k) represents the adjusted temperature of the k-th sampling; e(k) = T(k) - T(s); T(k) represents the current indoor or outdoor temperature of the k-th sampling; T(s) represents the set temperature; Kp represents the proportional coefficient; K i K represents the integral coefficient; i =Kp*T / T i ;T i The integral time constant is represented by Kd; the differential coefficient is represented by Kd = kp * Td / T; u(k) represents the percentage of cooling demand calculated in the kth sampling; Td represents the differential time constant; T represents the sampling period; and Δu(k) represents the output increment.

[0069] The heat pump compressor 13 circulation system includes not only the indoor side 2 but also the outdoor side second evaporator 5. When the indoor side 2 needs to be heated and the outdoor side 1 needs to be cooled, the heat pump compressor 13 is turned on, and the first three-way proportional valve 11 is opened. The superheated refrigerant condenses and releases heat through the first condenser 14, thereby raising the temperature of the indoor side 2. The condensed subcooled refrigerant flows through the first three-way proportional valve 11 to the second evaporator 5, where it absorbs heat and vaporizes, thereby lowering the temperature of the outdoor side 1. The partially vaporized refrigerant returns to the first evaporator 12 to absorb heat again, and after complete vaporization, it returns to the heat pump compressor 13, completing one heat exchange cycle. On the outdoor side 1, the refrigeration compressor 6 is turned on, and the two-way proportional valve 9 and the second three-way proportional valve 7 are opened. The subcooled refrigerant absorbs heat and vaporizes through the third evaporator 4. The cold air cooled by the second evaporator 5 is further cooled by the third evaporator 4, which can accelerate the cooling speed of the room. After absorbing heat in the third evaporator 4, the superheated refrigerant exchanges heat with the cooling water. The hot water then travels through the two-way proportional valve 9 to the second condenser 15. The return air from the indoor side 2 is first heated by the second condenser 15, then heated by the first condenser 14 before returning to the indoor side 2. The cooling water from the refrigeration compressor 6 releases heat in the second condenser 15 and then returns to the cooling tower 10 through the second three-way proportional valve 7 for further cooling. Finally, it returns to the refrigeration compressor 6 via the water pump 8, completing one heat exchange cycle.

[0070] Or as Figure 1 As shown, in specific implementation, when the indoor temperature needs to be raised and the outdoor temperature needs to be lowered: the first circulation system and the second circulation system operate simultaneously;

[0071] The first loop system operates as follows:

[0072] The controller controls the first condenser 14 to dissipate heat from the superheated refrigerant, thereby raising the temperature of the indoor side 2. The controller also controls the first three-way proportional valve 11 to transfer the subcooled refrigerant to the second evaporator 5 and the first evaporator 12, respectively. The first condenser 14 can cool down the superheated refrigerant, thereby dissipating the heat of the superheated refrigerant to the indoor side 2 and raising the temperature of the indoor side 2.

[0073] The controller controls the second evaporator 5 to absorb heat from the outdoor side 1 and release heat to the subcooled refrigerant, then transfers the superheated refrigerant to the first evaporator 12.

[0074] The controller controls the first evaporator 12 to absorb external energy from the indoor side 2 and release heat to the superheated and subcooled refrigerants, and then transfers the superheated refrigerant to the heat pump compressor 13.

[0075] The controller controls the heat pump compressor 13 to output superheated refrigerant to the first condenser 14, and after the controller controls the first condenser 14 to absorb heat from the superheated refrigerant, the controller controls the first three-way proportional valve 11 to transfer the subcooled refrigerant to the second evaporator 5 and the first evaporator 12 respectively.

[0076] The second loop system operates as follows:

[0077] The controller controls the operation of the refrigeration compressor 6, and the refrigerant produced is cooled by cooling water and then transferred to the third evaporator 4.

[0078] The third evaporator 4 cools the outdoor side 1 by absorbing heat from the subcooled refrigerant and transferring the superheated refrigerant to the refrigerant input terminal of the refrigeration compressor 6. The subcooled refrigerant is heated by the third evaporator 4, and the heat generated during the heating process is obtained by absorbing heat from the outdoor side 1, thus achieving the cooling of the outdoor side 1.

[0079] Based on the controller controlling the second three-way proportional valve 7, the refrigeration compressor 6 transmits superheated cooling water to the second condenser 15 through the second three-way proportional valve 7.

[0080] The second condenser 15 releases heat from the superheated cooling water to raise the temperature of the indoor side 2 and transfers the subcooled cooling water to the cooling tower 10.

[0081] The cooling tower 10 absorbs heat from the subcooled cooling water and transmits the subcooled cooling water to the refrigeration compressor 6; the controller returns to control the operation of the refrigeration compressor 6, and the generated refrigerant is cooled by the cooling water and then transmitted to the third evaporator 4.

[0082] A water pump 8 and a drain outlet are provided between the output end of the cooling tower 10 and the cooling water input end of the refrigeration compressor 6.

[0083] As a specific embodiment, when indoor side 2 needs cooling and outdoor side 1 needs heating, the tested unit is turned on. Because the tested unit only cools indoor side 2 and only releases heat outdoor side 1, it can achieve the purpose of cooling indoor side 2 and heating outdoor side 1. When the temperatures of indoor side 2 and outdoor side 1 reach near the preset value, the heat pump compressor 13 is then turned on. The first three-way proportional valve 11 is adjusted so that the superheated refrigerant flows directly to the first evaporator 12, bypassing the second evaporator 5. In this way, the heat pump compressor 13 no longer absorbs heat through the second evaporator 5. The refrigeration compressor 6 is then turned on, the two-way proportional valve 9 is closed, and the second three-way proportional valve 7 is adjusted so that the cooling water flows directly to the cooling tower 10 without passing through the second condenser 15. In this way, the refrigeration compressor 6 no longer releases heat through the second condenser 15.

[0084] As can be seen from the above technical solution, compared with the prior art, this invention discloses an energy-saving high-precision cascaded rapid temperature control system for enthalpy difference laboratories. In use, the heat pump compressor 13 is turned on. The refrigerant in the heat pump compressor 13 condenses and releases heat through the first condenser 14, and then absorbs heat and vaporizes through the second evaporator 5, transferring heat from the indoor side 2 to the outdoor side 1. After the refrigeration compressor 6 is turned on, the refrigerant absorbs heat and vaporizes through the third evaporator 4, and then exchanges heat with cooling water through a water-cooled condenser. The hot water then releases heat through the second water-cooled condenser, transferring heat from the outdoor side 1 to the indoor side 2. When the indoor side 2 heats up and the outdoor side 1 cools down, the heating and cooling speed is greatly improved, reducing power consumption and achieving energy saving and high-precision rapid temperature control in the enthalpy difference laboratory, greatly meeting the actual needs of computer room air conditioning testing.

[0085] The first three-way proportional valve 11 and the second three-way proportional valve 7 are electrically regulated by the enthalpy difference laboratory controller. The first three-way proportional valve 11 can regulate the flow rate of refrigerant from the first condenser 14 through the second evaporator 5 and the third evaporator 4; the second three-way proportional valve 7 can regulate the flow rate of cooling water after heat absorption by the refrigeration compressor 6 to the second condenser 15 and to the cooling tower 10, with a sensitive and rapid response. The two-way proportional valve 9 can also be controlled to open and close by the controller. In specific applications, the indoor side 2 also includes an electric heater, an electric humidifier, and a condenser fan, while the outdoor side 1 also includes an electric heater and an evaporator fan. All fans are variable frequency fans and are speed-controlled by the enthalpy difference laboratory controller.

[0086] The beneficial effects of this invention are:

[0087] Intelligent control is achieved through an enthalpy difference laboratory controller. Based on the current temperature and humidity conditions of indoor side 2 and outdoor side 1, as well as the set operating temperature and humidity conditions, the controller first makes a coarse adjustment to quickly raise or lower the temperature and humidity of indoor side 2 and outdoor side 1 to near the set values. Then, the PID algorithm dynamically controls the operating frequency of the refrigeration compressor 6 and the heat pump compressor 13, and controls the refrigerant flow by measuring the speed of the indoor condenser fan, the speed of the evaporator fan, and the opening degree of the first three-way proportional valve 11 and the second three-way proportional valve 7. This achieves heat exchange between indoor side 2 and outdoor side 1, as well as precise control of temperature and humidity, which is both energy-saving and highly efficient.

[0088] The energy-saving enthalpy difference laboratory high-precision cascade rapid temperature control system adds corresponding heat exchangers to both the indoor side 2 and the outdoor side 1, enabling heat exchange between them. It fully utilizes the condensation heat discharged from the low-temperature side and the cooling energy discharged from the high-temperature side, reducing the laboratory's power consumption while controlling the temperature, achieving energy saving and rapid temperature control. The outdoor side 1 only requires one set of refrigeration compressor 6, and the indoor side 2 only requires one set of heat pump compressor 13. Through optimized pipeline design and combined with PID control adjustment, the overall investment in the laboratory can be reduced.

[0089] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0090] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A high-precision cascade rapid temperature control system for energy-saving enthalpy difference laboratory, characterized in that, The system comprises: an indoor side, an outdoor side, a measured unit outdoor unit, a measured unit indoor unit, a heat pump compressor, a refrigeration compressor, a first condenser, a second condenser, a first evaporator, a second evaporator, a third evaporator and a cooling tower; The first condenser, the second evaporator, the first evaporator and the heat pump compressor constitute a first circulation system; the second condenser, the third evaporator, the cooling tower and the refrigeration compressor constitute a second circulation system; The measured unit indoor unit, the first condenser and the second condenser are arranged in the interior of the indoor side; The measured unit outdoor unit, the second evaporator and the third evaporator are arranged in the interior of the outdoor side; The outdoor side is located on one side of the indoor side; The heat pump compressor and the first evaporator are arranged in the exterior of the indoor side; The refrigeration compressor and the cooling tower are arranged in the exterior of the outdoor side; An output end of the heat pump compressor is connected with an input end of the first condenser; an input end of the first evaporator is connected with an output end of the first condenser and an output end of the second evaporator respectively; an output end of the first condenser is further connected with an input end of the second evaporator; an output end of the first evaporator is connected with an input end of the heat pump compressor; a cooling refrigerant output end of the refrigeration compressor is connected with an input end of the third evaporator; an output end of the third evaporator is connected with a refrigerant input end of the refrigeration compressor; a cooling water output end of the refrigeration compressor is connected with an input end of the second condenser and an input end of the cooling tower respectively; an output end of the second condenser is connected with an input end of the cooling tower; an output end of the cooling tower is connected with a cooling water input end of the refrigeration compressor.

2. The high-precision cascade rapid temperature control system for energy-saving enthalpy difference laboratory of claim 1, wherein An input end of the first evaporator is connected with an output end of the first condenser and an output end of the second evaporator through a first three-way proportional valve respectively.

3. The energy-saving high-precision cascade fast temperature control system for enthalpy difference laboratory according to claim 2, characterized in that, A cooling water output end of the refrigeration compressor is connected with an input end of the second condenser and an input end of the cooling tower through a second three-way proportional valve respectively.

4. The energy-saving high-precision cascade rapid temperature control system for enthalpy difference laboratory according to claim 3, characterized in that, An output end of the second condenser is connected with an input end of the cooling tower through a second three-way proportional valve.

5. The energy-saving high-precision cascade fast temperature control system for enthalpy difference laboratory according to claim 4, characterized in that, The high-precision cascade rapid temperature adjusting system for the energy-saving enthalpy difference laboratory further comprises a controller. The controller is connected with control ends of the heat pump compressor, the first condenser, the second evaporator, the first evaporator, the third evaporator, the second condenser, the refrigeration compressor, the second three-way proportional valve, the first three-way proportional valve and the cooling tower respectively. The controller is used for adjusting the heat pump compressor, the refrigeration compressor, the first condenser, the second evaporator, the first evaporator, the third evaporator, the second condenser, the second three-way proportional valve, the first three-way proportional valve and the cooling tower through a PID algorithm according to current indoor temperature and humidity and current outdoor temperature and humidity, so that the set indoor temperature and humidity is consistent with the set working condition temperature and humidity.

6. The energy-saving high-precision cascade rapid temperature control system for enthalpy difference laboratory according to claim 5, characterized in that, When the indoor temperature needs to be raised and the outdoor temperature needs to be lowered, the first circulation system and the second circulation system operate simultaneously. The first circulation system, in particular operation: The controller controls the first condenser to release heat to the indoor side based on superheated refrigerant, and to warm the indoor side, and the controller controls the first three-way proportional valve to transmit supercooled refrigerant to the second evaporator and the first evaporator, respectively; The controller controls the second evaporator to release heat to supercooled refrigerant after absorbing heat from the outdoor side, and to transmit superheated refrigerant to the first evaporator; The controller controls the first evaporator to release heat to superheated refrigerant and supercooled refrigerant after absorbing energy from the indoor side, and to transmit superheated refrigerant to the heat pump compressor; The controller controls the heat pump compressor to output superheated refrigerant to the first condenser, and returns to the step of the controller controlling the first condenser to absorb heat from superheated refrigerant, and the controller controls the first three-way proportional valve to transmit supercooled refrigerant to the second evaporator and the first evaporator, respectively; The second circulation system, in particular operation: The controller controls the refrigeration compressor to operate, and the generated refrigerant is cooled by cooling water and then transmitted to the third evaporator; The third evaporator absorbs heat based on supercooled refrigerant, cools the outdoor side, and transmits superheated refrigerant to the refrigerant input end of the refrigeration compressor; Based on the controller controlling the second three-way proportional valve, the refrigeration compressor transmits superheated cooling water to the second condenser through the second three-way proportional valve; The second condenser releases heat to the indoor side based on superheated cooling water, and warms the indoor side, and transmits supercooled cooling water to the cooling tower; The cooling tower absorbs heat from supercooled cooling water, and transmits supercooled cooling water to the refrigeration compressor; Return to the step of the controller controlling the refrigeration compressor to operate, and the generated refrigerant is cooled by cooling water and then transmitted to the third evaporator.

7. The energy-efficient high-precision cascade fast temperature control system for enthalpy difference laboratory according to claim 1, characterized in that, A water pump and a blowdown port are arranged between the output end of the cooling tower and the cooling water input end of the refrigeration compressor.

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