Refrigeration and dehumidification system and method

Abstract

The invention relates to the field of refrigeration and dehumidification, in particular to a refrigeration and dehumidification system and method. A refrigeration and dehumidification system comprises a refrigeration and dehumidification unit, an acting unit, a heat recovery unit and a control unit. The control unit is arranged at the output end of the acting unit, and the output end of the acting unit is controlled by the control unit to communicate with the input end of the refrigeration and dehumidification unit and / or the input end of the heat recovery unit. The output end of the heat recovery unit is communicated with the input end of the refrigeration and dehumidification unit; the input end of the acting unit is communicated with the output end of the refrigerating and dehumidifying unit; the control unit controls the output end of the acting unit to communicate with the input ends of the refrigeration and dehumidification unit and the heat recovery unit at the same time, and refrigerants output by the acting unit are conveyed to the refrigeration and dehumidification unit and the heat recovery unit. The heat recovery unit is used for replacing traditional electric heating or boiler heating, and energy consumption is directly reduced; therefore, the energy efficiency of the system is improved, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration and dehumidification, and particularly to a refrigeration and dehumidification system and method. Background Art

[0002] For traditional computer room air conditioners, in order to meet the constant temperature and humidity environment temperature of the computer room, a refrigeration and dehumidification scheme is usually adopted, that is, the evaporation temperature during the refrigeration process is lower than the dew point temperature of the air in the environment, so that the water in the air is condensed, and a certain amount of latent heat of vaporization is obtained to achieve the dehumidification effect. In fact, due to the design of the computer room air conditioner needs to meet the requirement of a sensible heat ratio greater than 90%, the amount of latent heat of vaporization obtained is very small, and the dehumidification effect is not ideal. In application, a better dehumidification effect can often be obtained only in a high-temperature and high-humidity environment temperature.

[0003] On the other hand, when the indoor heat load is relatively low, especially for fixed-frequency units, the cooling capacity produced during the refrigeration and dehumidification process is often larger than the indoor heat load. At this time, the computer room unit must turn on additional heating equipment to avoid low temperature in the computer room. This results in a significant reduction in the dehumidification energy efficiency of the air conditioner. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a refrigeration and dehumidification system and method.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a refrigeration and dehumidification system, including a refrigeration and dehumidification unit, a work unit, a heat recovery unit, and a control unit;

[0006] The control unit is arranged at the output end of the work unit, and the output end of the work unit is controlled by the control unit to communicate with the input ends of the refrigeration and dehumidification unit and / or the heat recovery unit;

[0007] The output end of the heat recovery unit is communicated with the input end of the refrigeration and dehumidification unit;

[0008] The input end of the work unit is communicated with the output end of the refrigeration and dehumidification unit;

[0009] The refrigeration and dehumidification system includes an energy-saving dehumidification mode;

[0010] In the energy-saving dehumidification mode, the control unit controls the output end of the work unit to communicate with the input ends of the refrigeration and dehumidification unit and the heat recovery unit at the same time, and conveys the refrigerant output by the work unit to the refrigeration and dehumidification unit and the heat recovery unit.

[0011] Preferably, the heat recovery unit includes a heat exchange device;

[0012] The input end of the heat exchange device is connected to the control unit, and the output end of the heat exchange device is communicated with the input end of the refrigeration and dehumidification unit; the heat exchange device is located on the air supply side of the refrigeration and dehumidification unit.

[0013] Preferably, the control unit includes a flow regulating valve;

[0014] The output end of the work unit is connected to the heat exchange device through the flow regulating valve;

[0015] In the energy-saving dehumidification mode, the flow regulating valve is opened, and the output end of the work unit is communicated with the input end of the heat recovery unit through the flow regulating valve.

[0016] Preferably, the refrigeration and dehumidification system further includes a refrigeration and dehumidification mode;

[0017] The refrigeration and dehumidification unit includes an electronic throttling device;

[0018] In the refrigeration and dehumidification mode, the electronic throttling device adjusts the opening according to the refrigeration load, the flow regulating valve is in the closed state, the input end of the heat recovery unit is cut off from the output end of the work unit; the input end of the refrigeration and dehumidification unit is communicated with the output end of the work unit and the output end of the heat recovery unit; the input end of the work unit is communicated with the output end of the refrigeration and dehumidification unit;

[0019] The work unit and the refrigeration and dehumidification unit form a coolant circulation loop to perform refrigeration and dehumidification through the refrigeration and dehumidification unit.

[0020] Preferably, the refrigeration and dehumidification system further includes a high-efficiency dehumidification mode; the refrigeration and dehumidification unit includes an electronic throttling device;

[0021] In the high-efficiency dehumidification mode, the electronic throttling device adjusts the opening according to the dehumidification load, the flow regulating valve is closed, and the input end of the heat recovery unit is cut off from the output end of the work unit;

[0022] The input end of the refrigeration and dehumidification unit is communicated with the output end of the work unit and the output end of the heat recovery unit; the input end of the work unit is communicated with the output end of the refrigeration and dehumidification unit;

[0023] The work unit and the refrigeration and dehumidification unit form a coolant circulation loop to perform high-efficiency dehumidification through the refrigeration and dehumidification unit.

[0024] Preferably, the refrigeration and dehumidification system further includes: a return air temperature and humidity sensor and an outlet air temperature and humidity sensor;

[0025] The return air temperature and humidity sensor is located within a preset range of the return air outlet, and is used to detect the temperature and humidity of the indoor return air;

[0026] The supply air temperature and humidity sensor is located within the measurement range of the supply air outlet, and is used to detect the temperature and humidity of the air outlet;

[0027] The refrigeration and dehumidification system determines the dehumidification load based on the humidity collected by the return air temperature and humidity sensor and the supply air temperature and humidity sensor.

[0028] Preferably, the refrigeration and dehumidification system further includes: an evaporation temperature detector and a suction temperature sensor;

[0029] The suction temperature sensor is connected in series between the input end of the work unit and the output end of the refrigeration and dehumidification unit; the suction temperature sensor is used to monitor the suction port temperature at the input end of the work unit;

[0030] The evaporation temperature detector is located inside the refrigeration and dehumidification unit; the evaporation temperature detector is used to monitor the refrigeration temperature of the refrigeration and dehumidification unit.

[0031] Preferably, the refrigeration and dehumidification unit further includes a protection component;

[0032] The protection component is connected to the electronic throttling device; the protection component is used to protect the refrigeration and dehumidification unit and the work unit connected to the refrigeration and dehumidification unit.

[0033] Preferably, the refrigeration and dehumidification system further includes: a first check valve and a refrigerant pump; the refrigeration and dehumidification unit includes a second check valve;

[0034] The first check valve is connected in series between the input end and the output end of the refrigeration and dehumidification unit, and is connected in parallel with the work unit;

[0035] The refrigerant pump and the second check valve are connected in series between the refrigeration device and the heat dissipation device of the refrigeration and dehumidification unit; the refrigerant pump is connected in parallel with the second check valve;

[0036] The refrigeration and dehumidification system further includes a fluorine pump mode;

[0037] In the fluorine pump mode, the work unit stops operating, the refrigerant pump starts, and the refrigeration and dehumidification unit and / or the heat recovery unit form a coolant circulation loop to perform refrigeration and dehumidification or energy-saving dehumidification through the refrigeration and dehumidification unit.

[0038] A refrigeration and dehumidification method for the above-mentioned refrigeration and dehumidification system includes:

[0039] Obtain the indoor air humidity and indoor air temperature;

[0040] Calculate the refrigeration load and dehumidification load according to the indoor air temperature and the indoor air humidity;

[0041] Determine the refrigeration mode according to the refrigeration compliance and the dehumidification compliance;

[0042] If the refrigeration mode is the energy-saving dehumidification mode, the output end of the work unit is controlled by the control unit to communicate with the input ends of the refrigeration and dehumidification unit and the heat recovery unit;

[0043] After the refrigerant does work through the work unit, it is discharged from the output end of the work unit to the refrigeration and dehumidification unit and the heat recovery unit;

[0044] The refrigeration and dehumidification unit uses the refrigerant output by the work unit to refrigerate and dehumidify the return air to obtain dry air;

[0045] The heat recovery unit uses the refrigerant output by the work unit to heat the dry air to obtain the supply air with the same temperature as the return air.

[0046] Preferably, determining the refrigeration mode according to the refrigeration load and the dehumidification load includes:

[0047] If the refrigeration load is less than the dehumidification load and the refrigeration load is less than or equal to 0, it is the energy-saving dehumidification mode;

[0048] If the refrigeration load is less than or equal to the dehumidification load and the refrigeration load is greater than 0, it is the high-efficiency dehumidification mode;

[0049] If the refrigeration load is greater than the dehumidification load, it is the refrigeration and dehumidification mode.

[0050] Implementing the present invention has the following beneficial effects:

[0051] The present invention uses the waste heat recovered by the heat recovery unit to replace traditional electric heating or boiler heating, directly reducing energy consumption; at the same time, reducing the heat dissipation pressure, enhancing the refrigeration and dehumidification heat dissipation capacity, reducing the load of the work unit, thereby improving the system energy efficiency and extending the equipment life. Description of the Drawings

[0052] The present invention will be further described below in conjunction with the drawings and embodiments:

[0053] Figure 1 It is a schematic diagram of a refrigeration and dehumidification system in an embodiment;

[0054] Figure 2 It is a schematic diagram of the component connection of a refrigeration and dehumidification bucket in an embodiment;

[0055] Figure 3 It is a flowchart of the refrigeration and dehumidification method in an embodiment. Specific embodiments

[0056] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0057] A component is referred to as being "fixed to" or "disposed on" another component, and it can be directly or indirectly located on that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0058] The terms "first", "second", etc. are only used for convenience of description and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0059] The above terms are only for convenience of description and cannot be construed as a limitation to the technical solution of the present invention.

[0060] A refrigeration and dehumidification system provided by an embodiment of the present invention. As Figure 1 shown, the refrigeration and dehumidification system includes a refrigeration and dehumidification unit A, a work unit C, a heat recovery unit B, and a control unit D.

[0061] Specifically, the refrigeration and dehumidification unit A absorbs heat through the evaporation of the refrigerant, reduces the dew point temperature of the air, condenses and precipitates the water vapor in the air, and realizes dehumidification. The work unit C does work on the gaseous refrigerant to increase its pressure and temperature, creating conditions for the refrigerant to release heat in the heat recovery unit B. The heat released by the heat recovery unit B is used to heat air, water, or for other purposes, improving the overall energy efficiency of the system. The control unit D is used to control the connection between the heat recovery unit and the work unit.

[0062] The control unit D is arranged at the output end of the work unit C, and the output end of the work unit C is controlled by the control unit D to be connected to the input end of the refrigeration and dehumidification unit A and / or the heat recovery unit B.

[0063] Furthermore, there may be multiple control components in the control unit D, and different components are arranged at different positions. However, there must be one control component arranged at the output end of the work unit C, and the output end of the work unit C is controlled by this control component to be connected to the input end of the refrigeration and dehumidification unit A. In some scenarios, this control component controls the output end of the work unit C to be connected to the input ends of the refrigeration and dehumidification unit A and the heat recovery unit B.

[0064] The output end of the heat recovery unit B is connected to the input end of the refrigeration and dehumidification unit A.

[0065] The input end of the work unit C is connected to the output end of the refrigeration and dehumidification unit A.

[0066] It should be noted that after the refrigerant in the heat recovery unit B heats the supply air, the refrigerant flows from the output end of the heat recovery unit B into the input end of the refrigeration and dehumidification unit A and mixes with the refrigerant flowing out of the work unit C.

[0067] The refrigeration and dehumidification system includes an energy-saving dehumidification mode.

[0068] Specifically, when the refrigeration load is less than or equal to the dehumidification load and the refrigeration load is less than 0, the energy-saving dehumidification mode is entered at this time. The indoor does not require the refrigeration load. The cold dehumidification unit, the work unit, the heat recovery unit, and the control unit target the dehumidification evaporation temperature.

[0069] In the energy-saving dehumidification mode, the control unit D controls the output end of the work unit C to be connected to the input ends of both the refrigeration and dehumidification unit A and the heat recovery unit B at the same time, and conveys the refrigerant output by the work unit C to the refrigeration and dehumidification unit A and the heat recovery unit B.

[0070] Specifically, to ensure that the temperature is not too low during the operation of the system, the control unit D connects the output end of the work unit C and the input end of the heat recovery unit. The heat load generated during the operation of the system heats the supply air of the unit through the heat recovery unit B, so that the supply air is consistent with the return air, achieving the effect of energy saving. The adjustment of the flow rate is controlled with the outlet air temperature as the target. On the refrigerant side, the refrigerant cooled by the supply air is recycled to the inlet end of the refrigeration and dehumidification unit A, mixed with the remaining output of the work unit C, and then enters the refrigeration and dehumidification unit A and circulates back to the indoor side.

[0071] The present invention replaces the traditional electric heating or boiler heating with the waste heat recovered by the heat recovery unit, directly reducing the energy consumption by 20%-40%; secondly, the low-temperature supply air after refrigeration and dehumidification is heated to a suitable temperature (such as 25°C) by the heat recovery unit, avoiding cold air discomfort and taking into account both dehumidification and comfort; at the same time, due to the reduction of the refrigeration and dehumidification and heat dissipation pressure, the load of the work unit decreases, the coefficient of performance (COP) of the system increases and the service life is extended; in addition, reducing the external energy dependence not only reduces carbon emissions (about 0.5 kg CO2 / h for every 1 kW of heat recovered), but also enhances the stability of temperature and humidity control through the internal heat cycle, reduces the interference of environmental fluctuations, and realizes multi-dimensional optimization of energy saving, environmental protection and operation reliability.

[0072] In an executable embodiment, the heat recovery unit includes a heat exchange device.

[0073] The input end of the heat exchange device is connected to the control unit, and the output end of the heat exchange device is connected to the input end of the refrigeration and dehumidification unit; the heat exchange device is located on the supply air side of the refrigeration and dehumidification unit.

[0074] Furthermore, the heat exchange device can be a plate heat exchanger; it is connected to the control unit through an electric valve or a variable frequency fan to adjust the heat recovery amount. It is connected to the inlet of the evaporator or condenser of the refrigeration and dehumidification unit to pre-cool or pre-heat the air. It is installed in the air supply duct, close to the air supply outlet of the refrigeration and dehumidification unit.

[0075] The heat exchange device can also be a heat pipe heat exchanger; it feeds back signals to the control unit through a temperature sensor to adjust the working state of the heat pipe. It is connected to the air handling section of the refrigeration and dehumidification unit to achieve heat transfer. It is embedded in the air supply duct and is located downstream of the refrigeration and dehumidification unit.

[0076] The heat exchange device can also be a rotary heat exchanger; it drives the rotation speed of the rotary wheel through a motor, and the control unit adjusts the heat recovery efficiency. It is connected to the fresh air inlet of the refrigeration and dehumidification unit to pre-heat the fresh air. It is installed on the air supply side and is arranged in parallel with the refrigeration and dehumidification unit.

[0077] In an executable embodiment, the control unit includes a flow regulating valve.

[0078] Specifically, the flow regulating valve can be one of an electric regulating valve, a solenoid valve, a proportional integral valve (PI valve), etc.

[0079] The output end of the work unit is connected to the heat exchange device through the flow regulating valve.

[0080] Furthermore, the output end of the work unit is divided into two paths: one path directly enters the refrigeration and dehumidification unit, and the other path enters the heat recovery unit through the flow regulating valve.

[0081] In the energy-saving dehumidification mode, the flow regulating valve is opened, and the output end of the work unit is connected to the input end of the heat recovery unit through the flow regulating valve.

[0082] It can be inferred that in the energy-saving dehumidification mode, the refrigerant enters the heat recovery unit and the refrigeration unit simultaneously, taking into account energy efficiency, comfort, and safety.

[0083] In an executable embodiment, the refrigeration and dehumidification system further includes a refrigeration and dehumidification mode.

[0084] The refrigeration and dehumidification unit includes an electronic throttling device.

[0085] Specifically, the refrigeration and dehumidification unit adjusts the valve opening through an electric signal to precisely control the refrigerant flow rate.

[0086] In the refrigeration and dehumidification mode, the electronic throttling device adjusts the opening according to the refrigeration load, the flow regulating valve is in the closed state, and the input end of the heat recovery unit is cut off from the output end of the work unit. The input end of the refrigeration and dehumidification unit is connected to the output end of the work unit and the output end of the heat recovery unit. The input end of the work unit is connected to the output end of the refrigeration and dehumidification unit.

[0087] Specifically, the refrigeration and dehumidification system can obtain the temperature of each node through a temperature sensor, thereby obtaining the refrigeration load, and further controlling the opening degree of the electronic throttling device according to the refrigeration load.

[0088] Meanwhile, in this mode, the refrigerant does not flow into the heat recovery unit, thereby closing the flow regulating valve. The input end of the heat recovery unit is disconnected from the output end of the work unit, avoiding the heat exchange device from heating the supply air, reducing the refrigeration effect, and improving the efficiency.

[0089] The work unit and the refrigeration and dehumidification unit form a coolant circulation loop to perform refrigeration and dehumidification through the refrigeration and dehumidification unit.

[0090] In an executable embodiment, the refrigeration and dehumidification system further includes an efficient dehumidification mode; the refrigeration and dehumidification unit includes an electronic throttling device.

[0091] In the efficient dehumidification mode, the electronic throttling device adjusts the opening degree according to the dehumidification load, the flow regulating valve is closed, and the input end of the heat recovery unit is cut off from the output end of the work unit.

[0092] Specifically, the dehumidification load can be obtained by using a humidity sensor to respectively obtain the corresponding humidity from the supply air outlet and the return air outlet and calculating.

[0093] The input end of the refrigeration and dehumidification unit is communicated with the output end of the work unit and the output end of the heat recovery unit; the input end of the work unit is communicated with the output end of the refrigeration and dehumidification unit.

[0094] The work unit and the refrigeration and dehumidification unit form a coolant circulation loop to perform efficient dehumidification through the refrigeration and dehumidification unit.

[0095] In some executable embodiments, the sensors at the supply air outlet and the return air outlet can be temperature and humidity sensors, which simultaneously obtain data of temperature and humidity.

[0096] In an executable embodiment, the refrigeration and dehumidification system further includes: a return air temperature and humidity sensor and a supply air temperature and humidity sensor.

[0097] The return air temperature and humidity sensor is located within a preset range of the return air outlet, and the return air temperature and humidity sensor is used to detect the temperature and humidity of the indoor return air.

[0098] The supply air temperature and humidity sensor is located within the measurement range of the supply air outlet, and the supply air temperature and humidity sensor is used to detect the temperature and humidity of the air outlet.

[0099] The refrigeration and dehumidification system determines the dehumidification load based on the humidity collected by the return air temperature and humidity sensor and the supply air temperature and humidity sensor.

[0100] It should be noted that the preset range ensures that the sensor is located in a stable airflow area, avoiding measurement errors caused by local turbulence or dead corners.

[0101] In an executable embodiment, the refrigeration and dehumidification system further includes an evaporation temperature detector and a suction temperature sensor.

[0102] The suction temperature sensor is connected in series between the input end of the work unit and the output end of the refrigeration and dehumidification unit; the suction temperature sensor is used to monitor the suction port temperature at the input end of the work unit.

[0103] The evaporation temperature detector is located inside the refrigeration and dehumidification unit; the evaporation temperature detector is used to monitor the refrigeration temperature of the refrigeration and dehumidification unit.

[0104] In some executable embodiments, the evaporation temperature detector obtains the internal temperature of the evaporator and the surface temperature of the evaporator. The actual refrigeration capacity is calculated based on the internal temperature and the surface temperature of the evaporator.

[0105] The specific formula is: actual refrigeration capacity = (surface temperature of the evaporator - internal temperature of the evaporator) * heat transfer coefficient * heat transfer area.

[0106] The suction temperature obtained by the suction temperature sensor is used to calculate the flow rate of the flow regulating valve.

[0107] Specifically, the difference between the suction temperature and the temperature corresponding to the saturation pressure of the evaporator is used as the target temperature. Then, the target temperature is converted into the flow rate of the flow regulating valve.

[0108] In an executable embodiment, the refrigeration and dehumidification unit further includes a protection component.

[0109] The protection component is connected to the electronic throttling device. The protection component is used to protect the refrigeration and dehumidification unit and the work unit connected to the refrigeration and dehumidification unit.

[0110] In some embodiments, the protection component includes one or more of a gas pipe ball valve, a liquid pipe ball valve, a dryer filter, and a sight glass.

[0111] In an executable embodiment, the refrigeration and dehumidification system further includes a first check valve and a refrigerant pump. The refrigeration and dehumidification unit includes a second check valve.

[0112] The first check valve is connected in series between the input end and the output end of the refrigeration and dehumidification unit and is connected in parallel with the work unit.

[0113] When the work unit stops running and the refrigerant pump runs, the refrigerant flows from the output end of the refrigeration and dehumidification unit through the first check valve to the input end of the refrigeration and dehumidification unit.

[0114] The refrigerant pump and the second one-way valve are connected in series between the refrigeration device and the heat dissipation device of the refrigeration and dehumidification unit. The refrigerant pump is connected in parallel with the second one-way valve.

[0115] The refrigerant pump provides the power for the refrigerant to circulate between the refrigeration device and the heat dissipation device.

[0116] The refrigeration and dehumidification system further includes a fluorine pump mode.

[0117] In the fluorine pump mode, the work unit stops operating, the refrigerant pump starts, and the refrigeration and dehumidification unit and / or the heat recovery unit form a coolant circulation loop to perform refrigeration and dehumidification or energy-saving dehumidification through the refrigeration and dehumidification unit.

[0118] The fluorine pump mode only requires the fluorine pump to drive the liquid refrigerant to flow, and the power consumption is significantly reduced.

[0119] In an executable embodiment, as Figure 2 shown, the refrigeration and dehumidification unit A includes: an electronic throttling device A1, a refrigeration device, a heat dissipation device, a protection component, a liquid storage tank A2, and a third one-way valve A3.

[0120] The work unit includes a compressor C1 and a fourth one-way valve C2.

[0121] The heat recovery unit includes a heat exchange device B1.

[0122] The control unit includes a flow regulating valve D1.

[0123] Furthermore, the refrigeration device includes an evaporator A4 and a first fan A5; the heat dissipation device includes a condenser A6 and a second fan A7; the protection component includes a liquid sight glass A8, a dryer filter A9, a gas pipe ball valve A10, a liquid pipe ball valve A11, and a solenoid valve A12.

[0124] The evaporator A4 is located on the intake side of the first fan A5, and the heat exchange device B1 is located on the outlet side of the first fan A5.

[0125] The liquid storage tank A2 is connected in series between the input end of the evaporator A4 and the output end of the condenser A6; the output end of the heat exchange device B1 is connected to the input end of the condenser A6;

[0126] The gas pipe ball valve A10 is connected in series between the output end of the compressor C1 and the input end of the condenser A6 to control the flow of the gaseous refrigerant.

[0127] The third one-way valve A3 is connected in series between the condenser A6 and the gas pipe ball valve A10 to prevent the liquid refrigerant in the pipeline from flowing back.

[0128] The fourth one-way valve C2 is connected in series between the gas pipe ball valve A10, the flow regulating valve D1, and the compressor C1 to prevent the gaseous refrigerant from flowing back into the compressor C1 from the pipeline.

[0129] The sight glass A8, the dryer filter A9, and the solenoid valve A12 are connected in series between the liquid line ball valve A11 and the electronic throttling device A1.

[0130] The flow regulating valve D1 is connected in series with the heat exchange device B1, and the output end of the compressor C1 is connected to the flow regulating valve D1.

[0131] In some scenarios, the solenoid valve A12 is connected in series between the electronic throttling device A1 and the liquid line ball valve A11, cutting off the liquid refrigerant passage in the power-off state.

[0132] In an executable embodiment, as Figure 2 shown, the refrigeration and dehumidification system further includes a first check valve E and a refrigerant pump F. The refrigeration and dehumidification unit further includes a second check valve A13.

[0133] The first check valve E is connected in series between the input end and the output end of the refrigeration and dehumidification unit A, and is connected in parallel with the working unit C.

[0134] Furthermore, the first check valve E is connected in series between the gas line ball valve A10 and the evaporator A4, and is connected in parallel with the compressor C1 and the fourth check valve C2.

[0135] The second check valve 110 is connected in series between the liquid storage tank A2 and the liquid line ball valve A11 to prevent the liquid refrigerant in the pipeline from flowing back to the liquid storage tank A2.

[0136] The refrigerant pump F and the second check valve A13 are connected in series between the refrigeration device and the heat dissipation device of the refrigeration and dehumidification unit A. The refrigerant pump F is connected in parallel with the second check valve A13.

[0137] Furthermore, the refrigerant pump F and the second check valve A13 are connected in series between the liquid storage tank A2 and the electronic throttling device A1.

[0138] In some scenarios, the refrigerant pump F and the second check valve A13 are connected in series between the liquid storage tank A2 and the electronic throttling device A11.

[0139] In an executable embodiment, as Figure 2 shown, the refrigeration and dehumidification system further includes a return air temperature and humidity sensor G, an outlet air temperature and humidity sensor H, an evaporation temperature detector I, and a suction temperature sensor J.

[0140] The suction temperature sensor J is connected in series between the input end of the compressor and the output end of the evaporator A4. The suction temperature sensor is used to monitor the suction port temperature at the input end of the compressor C1. Installed here, it helps to improve the accuracy of refrigeration load calculation.

[0141] The evaporation temperature detector I is located on the evaporator A4; the evaporation temperature detector I is used to monitor the refrigeration temperature of the refrigeration and dehumidification unit A.

[0142] The refrigeration and dehumidification system determines the refrigeration load based on the temperatures collected by the evaporation temperature detector I and the suction temperature sensor J.

[0143] The return air temperature and humidity sensor G is located within a preset range of the return air outlet and upstream of the evaporator A4. The return air temperature and humidity sensor G is used to detect the temperature and humidity of the indoor air.

[0144] The supply air temperature and humidity sensor H is located near the supply air outlet of the heat exchange device B1. The supply air temperature and humidity sensor H is used to detect the temperature and humidity of the air outlet.

[0145] The refrigeration and dehumidification system determines the dehumidification load based on the humidity collected by the return air temperature and humidity sensor and the supply air temperature and humidity sensor.

[0146] Furthermore, the refrigeration and dehumidification system further includes a low-pressure pressure sensor K. The low-pressure pressure sensor K is arranged upstream of the suction temperature sensor and is connected in parallel with the compressor C1 and the suction temperature sensor J through a first one-way valve E. The suction temperature sensor J of the compressor C1 and the low-pressure pressure sensor K are configured to ensure that the operating pressure of the system meets the reliability requirements of the system design.

[0147] In some embodiments, the compressor adopts variable-frequency compression and the second fan adopts a variable-frequency fan.

[0148] The electronic throttling device can perform logical adjustment according to the logical requirements of the refrigeration target or the dehumidification target of the system. Furthermore, the electronic throttling device can be an electronic expansion valve.

[0149] The present invention also provides a refrigeration and dehumidification air conditioner, including the above-mentioned refrigeration and dehumidification system.

[0150] Furthermore, the refrigeration and dehumidification air conditioner can be used in a computer room to ensure the normal operation of electronic equipment in the computer room.

[0151] The present invention performs logical control through the evaporation temperature and the return air temperature and humidity of the air conditioner unit, which can ensure that during the refrigeration and dehumidification process, the dehumidification process is always maintained. At the same time, by controlling the evaporation temperature to be lower than the dew point temperature in the air, the amount of condensation, that is, the amount of dehumidification, can be increased.

[0152] The present invention also provides a refrigeration and dehumidification method for the above-mentioned refrigeration and dehumidification system. As Figure 3 shown, the refrigeration and dehumidification method includes:

[0153] Obtain the indoor air humidity and the indoor air temperature.

[0154] Calculate the refrigeration load and the dehumidification load based on the indoor air temperature and the indoor air humidity.

[0155] Determine the refrigeration mode according to the refrigeration load and dehumidification load.

[0156] If the refrigeration mode is the energy-saving dehumidification mode, the output end of the work unit is controlled by the control unit to communicate with the input ends of the refrigeration and dehumidification unit and the heat recovery unit.

[0157] Furthermore, the control unit includes a flow regulating valve; if the refrigeration mode is the energy-saving dehumidification mode, the flow regulating valve is opened.

[0158] In some scenarios, before opening the flow regulating valve, it also includes calculating the evaporation temperature based on the dehumidification amount, comparing it with the detected evaporation temperature, and obtaining the actual evaporation temperature requirement and the supply air temperature.

[0159] The opening degree of the flow regulating valve is controlled according to the supply air temperature requirement, and the compressor fan and the electronic expansion valve are adjusted based on the actual evaporation temperature requirement.

[0160] After the refrigerant does work through the work unit, it is discharged from the output end of the work unit to the refrigeration and dehumidification unit and the heat recovery unit.

[0161] The refrigeration and dehumidification unit uses the refrigerant output by the work unit to cool and dehumidify the return air to obtain dry air.

[0162] The heat recovery unit uses the refrigerant output by the work unit to heat the dry air to obtain supply air with the same temperature as the return air.

[0163] It can be understood that when the refrigeration load is less than the dehumidification load, the energy-saving dehumidification mode is adopted. At this time, the indoor refrigeration load is no longer required, and the compressor, fan, and electronic expansion valve are controlled with the dehumidification evaporation temperature as the target (the evaporation temperature is calculated based on the wet bulb temperature and dehumidification amount), and the latent heat of the system is the main at this time. To ensure that the temperature does not become too low during the operation of the system, the flow regulating valve is opened, and the heat load generated during the operation of the system flows into the heat exchanger at the air outlet of the system to heat the air supply of the unit, so that the air supply of the air conditioner is consistent with the return air of the air conditioner, achieving the effect of energy saving. The adjustment of the flow regulation is controlled with the outlet air temperature as the target. On the refrigerant side, the refrigerant cooled by the air supply is recycled to the inlet of the condenser, mixed with the remaining compressor exhaust, and then enters the condenser and circulates back to the indoor side.

[0164] Suppose that during the operation of the air conditioner, the total refrigeration capacity generated is Q1, Q1 includes the sensible heat refrigeration capacity therein, and the latent heat refrigeration capacity brought about by the phase change during the dehumidification process. The cold air passes through the indoor evaporator, passes through the heat exchanger, and is heated by the heating amount Q2 generated by the motor. Finally, the net refrigeration capacity Q3 of the air conditioner is delivered to the indoor environment. The heat load generated on the indoor side during the operation of the air conditioner is Q4, and the heat load generated by the compressor in overcoming the indoor and outdoor temperature during the refrigeration process is Q5, that is, the work power consumption of the compressor. Among them:

[0165] Q1 = Q3 + Q2

[0166] Q4 = Q1 + Q5

[0167] To ensure a very low air outlet temperature in the machine room, that is, providing a heat load of Q3 to the air supply can meet the requirements. And the heat load Q4 generated by the air conditioner operation = Q5 + Q3 + Q2. Then, the heat load of Q3 can be provided to the room through flow regulation, and the remaining load can be dissipated through the outer condenser to ensure the stable operation of the system.

[0168] For the air conditioner unit configured with a heating device, in addition to the above loads, an additional load of Q3 is required on the indoor side to ensure a constant indoor temperature, that is, the total condensation heat load = Q1 + Q5 + Q3 + Q2 + Q3. The loads on both the indoor and outdoor sides need to be increased, and the energy efficiency is greatly reduced.

[0169] Through logical control of the evaporation temperature and the return air temperature and humidity of the air conditioner unit, the present invention can ensure that during the refrigeration and dehumidification process, the dehumidification process is always maintained. At the same time, by controlling the evaporation temperature to be lower than the dew point temperature in the air, the amount of condensation, that is, the dehumidification amount, may be increased. Assuming the heat exchange amount due to temperature difference of the air conditioner is Q6 (sensible heat), and the heat exchange amount due to dehumidification is Q7 (latent heat), then Q1 = Q6 + Q7. The increase in the dehumidification amount during the dehumidification process will cause an increase in Q7, and then the heat exchange amount of Q6 can be reduced to ensure that the total cooling capacity remains unchanged.

[0170] In an executable embodiment, determining the refrigeration mode according to the refrigeration load and the dehumidification load includes:

[0171] If the refrigeration load is less than the dehumidification load and the refrigeration load is less than or equal to 0, it is an energy-saving dehumidification mode.

[0172] If the refrigeration load is less than or equal to the dehumidification load and the refrigeration load is greater than 0, it is a high-efficiency dehumidification mode.

[0173] In some scenarios, the high-efficiency dehumidification mode takes dehumidification as the first control element. The compressor, the second fan, and the electronic expansion valve are adjusted with the calculated evaporation temperature as the target (the evaporation temperature is inversely calculated through the dehumidification load) to meet the requirement of increasing the dehumidification amount while meeting the refrigeration load requirement (that is, reducing the sensible heat ratio and ensuring the cooling capacity remains unchanged). But at this time, the flow regulating valve is also in the closed state.

[0174] Furthermore, when the indoor refrigeration load and the dehumidification load and the refrigeration load is greater than the dehumidification load, the refrigeration and dehumidification mode is adopted. The compressor, the second fan, and the electronic expansion valve all adjust the indoor temperature according to the refrigeration load, and at the same time the flow regulating valve is closed. The system takes the latent heat during the refrigeration process as the dehumidification target for dehumidification.

[0175] If the refrigeration load is greater than the dehumidification load, it is the refrigeration and dehumidification mode.

[0176] If the refrigeration load is greater than the dehumidification load, the output end of the work unit is connected to the refrigeration and dehumidification unit through the control unit, and the output end of the work unit is cut off from the input end of the heat recovery unit through the control unit.

[0177] Further, if the refrigeration load is greater than the dehumidification load, the flow regulating valve is closed.

[0178] It can be understood that before closing the flow regulating valve, the evaporation temperature is calculated through the refrigeration load and compared with the detected evaporation temperature to calculate the evaporation temperature requirement.

[0179] While closing the flow regulating valve, the compressor, the second fan, and the electronic expansion valve are adjusted.

[0180] In an executable embodiment, the refrigeration and dehumidification method stabilizes the system at a state where the dehumidification demand and the refrigeration demand are equal to 0.

[0181] The above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present invention; it should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A refrigeration and dehumidification system, characterized in that, It includes a refrigeration and dehumidification unit, a work unit, a heat recovery unit and a control unit; The control unit is arranged at the output end of the work unit, and the output end of the work unit is controlled by the control unit to communicate with the input end of the refrigeration and dehumidification unit and / or the heat recovery unit; The output end of the heat recovery unit is communicated with the input end of the refrigeration and dehumidification unit; The input end of the work unit is communicated with the output end of the refrigeration and dehumidification unit; The refrigeration and dehumidification system includes an energy-saving dehumidification mode; In the energy-saving dehumidification mode, the control unit controls the output end of the work unit to be communicated with the input ends of both the refrigeration and dehumidification unit and the heat recovery unit at the same time, and conveys the refrigerant output by the work unit to the refrigeration and dehumidification unit and the heat recovery unit.

2. The refrigeration and dehumidification system according to claim 1, characterized in that, The heat recovery unit includes a heat exchange device; The input end of the heat exchange device is connected to the control unit, and the output end of the heat exchange device is communicated with the input end of the refrigeration and dehumidification unit; the heat exchange device is located on the air supply side of the refrigeration and dehumidification unit.

3. The refrigeration and dehumidification system according to claim 2, characterized in that, The control unit includes a flow regulating valve; The output end of the work unit is connected to the heat exchange device through the flow regulating valve; In the energy-saving dehumidification mode, the flow regulating valve is opened, and the output end of the work unit is communicated with the input end of the heat recovery unit through the flow regulating valve.

4. The refrigeration and dehumidification system according to claim 3, wherein, The refrigeration and dehumidification system further includes a refrigeration and dehumidification mode; The refrigeration and dehumidification unit includes an electronic throttling device; In the refrigeration and dehumidification mode, the electronic throttling device adjusts the opening degree according to the refrigeration load, the flow regulating valve is in a closed state, and the input end of the heat recovery unit is cut off from the output end of the work unit; the input end of the refrigeration and dehumidification unit is communicated with the output end of the work unit and the output end of the heat recovery unit; the input end of the work unit is communicated with the output end of the refrigeration and dehumidification unit; The work unit and the refrigeration and dehumidification unit form a coolant circulation loop to perform refrigeration and dehumidification through the refrigeration and dehumidification unit.

5. The refrigeration and dehumidification system according to claim 3, wherein The refrigeration and dehumidification system further includes a high-efficiency dehumidification mode; the refrigeration and dehumidification unit includes an electronic throttling device; In the high-efficiency dehumidification mode, the electronic throttling device adjusts the opening degree according to the dehumidification load, the flow regulating valve is closed, and the input end of the heat recovery unit is cut off from the output end of the work unit; The input end of the refrigeration and dehumidification unit is communicated with the output end of the work unit and the output end of the heat recovery unit; the input end of the work unit is communicated with the output end of the refrigeration and dehumidification unit; The work unit and the refrigeration and dehumidification unit form a coolant circulation loop to perform high-efficiency dehumidification through the refrigeration and dehumidification unit.

6. The refrigeration and dehumidification system according to claim 5, characterized in that, The refrigeration and dehumidification system further includes: a return air temperature and humidity sensor and a supply air temperature and humidity sensor; The return air temperature and humidity sensor is located within a preset range of the return air inlet, and the return air temperature and humidity sensor is used to detect the temperature and humidity of the indoor return air; The supply air temperature and humidity sensor is located within the measurement range of the supply air outlet, and the supply air temperature and humidity sensor is used to detect the temperature and humidity of the air outlet; The refrigeration and dehumidification system determines the dehumidification load based on the humidity collected by the return air temperature and humidity sensor and the supply air temperature and humidity sensor.

7. The refrigeration and dehumidification system according to claim 4, wherein The refrigeration and dehumidification system further includes: an evaporation temperature detector and a suction temperature sensor; The suction temperature sensor is connected in series between the input end of the work unit and the output end of the refrigeration and dehumidification unit; the suction temperature sensor is used to monitor the suction port temperature at the input end of the work unit. The evaporation temperature detector is located inside the refrigeration and dehumidification unit; the evaporation temperature detector is used to monitor the refrigeration temperature of the refrigeration and dehumidification unit.

8. The refrigeration and dehumidification system according to claim 4, wherein, The refrigeration and dehumidification unit further includes a protection component; The protection component is communicated with the electronic throttling device; the protection component is used to protect the refrigeration and dehumidification unit and the work unit connected to the refrigeration and dehumidification unit.

9. The refrigeration and dehumidification system according to claim 1, wherein, The refrigeration and dehumidification system further includes: a first check valve and a refrigerant pump; the refrigeration and dehumidification unit includes a second check valve; The first check valve is connected in series between the input end and the output end of the refrigeration and dehumidification unit, and is connected in parallel with the work unit; The refrigerant pump and the second check valve are connected in series between the refrigeration device and the heat dissipation device of the refrigeration and dehumidification unit; the refrigerant pump is connected in parallel with the second check valve; The refrigeration and dehumidification system further includes a fluorine pump mode; In the fluorine pump mode, the work unit stops operating, the refrigerant pump starts, and the refrigeration and dehumidification unit and / or the heat recovery unit form a coolant circulation loop to perform refrigeration and dehumidification or energy-saving dehumidification through the refrigeration and dehumidification unit.

10. A refrigeration and dehumidification method for the refrigeration and dehumidification system according to any one of claims 1 to 9, characterized in that, Including: Obtaining the indoor air humidity and the indoor air temperature; Calculating the refrigeration load and the dehumidification load based on the indoor air temperature and the indoor air humidity; Determining the refrigeration mode based on the refrigeration load and the dehumidification load; If the refrigeration mode is the energy-saving dehumidification mode, the output end of the work unit is controlled by the control unit to communicate with the input ends of the refrigeration and dehumidification unit and the heat recovery unit; After the refrigerant does work through the work unit, it is discharged from the output end of the work unit to the refrigeration and dehumidification unit and the heat recovery unit; The refrigeration and dehumidification unit uses the refrigerant output by the work unit to cool and dehumidify the return air to obtain dry air; The heat recovery unit uses the refrigerant output by the work unit to heat the dry air to obtain the supply air with the same temperature as the return air.

11. The refrigeration and dehumidification method according to claim 10, wherein The determining the refrigeration mode based on the refrigeration load and the dehumidification load includes: If the refrigeration load is less than the dehumidification load and the refrigeration load is less than or equal to 0, it is the energy-saving dehumidification mode; If the refrigeration load is less than or equal to the dehumidification load and the refrigeration load is greater than 0, it is the high-efficiency dehumidification mode; If the refrigeration load is greater than the dehumidification load, it is the refrigeration and dehumidification mode.

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