Air handling unit with temperature and humidity control function and air conditioner

Abstract

The utility model provides an air handling unit with a temperature and humidity control function and an air conditioner. The air handling unit is at least provided with an evaporator, a reheater, an electric heater and an electromagnetic valve. The evaporator, the electric heater and the reheater are arranged in the air handling unit; the evaporator and the reheater are connected with each other through an electromagnetic valve in the air handling unit; the air handling unit is configured to be switched among a single refrigeration mode, a first reheating mode, a second reheating mode and a third reheating mode according to on-off of the evaporator, the electric heater, the reheater and the electromagnetic valve. The air temperature is increased through condensation waste heat of the reheater, the load of the electric heater is reduced, and the comprehensive energy efficiency is improved; in the low-temperature environment, the reheater can be closed, and the situation that the system runs unstably due to the fact that the pressure of the system is too low is avoided; and meanwhile, the air handling unit can operate in a single refrigeration mode so as to meet the requirement for strong cooling.

Description

Technical Field

[0001] The utility model relates to a temperature and humidity control technology, in particular to an air handling unit and an air conditioner with temperature and humidity control, belonging to the technical field of air conditioning temperature and humidity control. Background Art

[0002] With the development of the times and technology, temperature and humidity play an increasingly important role in people's daily lives and in industrial and agricultural production. Especially as agricultural greenhouses move towards intelligent development, precise control of temperature and humidity plays a vital role in shortening the growth cycle of crops and improving quality and yield. The temperature in the greenhouse generally needs to be controlled at 18℃~28℃, and the relative humidity is 45%~65%RH. The air outlet temperature of ordinary air-conditioning units during cooling is generally around 10℃, and the relative humidity is above 90%, which cannot meet the temperature and humidity requirements of the greenhouse.

[0003] The industry usually adopts the method of arranging electric heating at the air outlet of the air conditioner to increase the outlet air temperature and reduce the relative humidity to meet the temperature and humidity requirements of the greenhouse, but this method consumes a lot of energy. There is also the use of condensation reheat technology, which connects a heat exchanger in series before the evaporator and uses high-temperature refrigerant to increase the outlet air temperature, but the series connection method cannot enter the pure cooling mode. When the temperature in the greenhouse is high, it cannot be cooled quickly. In addition, when the external ambient temperature is low, there may be insufficient condensation heat, and the outlet air temperature cannot be heated to the target temperature. Utility Model Content

[0004] In view of this, the utility model provides an air handling unit and an air conditioner with temperature and humidity control to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial choice.

[0005] The technical solution of the embodiment of the utility model is implemented as follows: an air handling unit with temperature and humidity control is provided with at least an evaporator, a reheater, an electric heater and a solenoid valve.

[0006] The evaporator, electric heater and reheater are arranged in sequence in the air handling unit according to the air intake direction; or the evaporator, reheater and electric heater are arranged in sequence in the air handling unit according to the air intake direction.

[0007] The evaporator and the reheater are connected to each other via a solenoid valve in the air handling unit.

[0008] The air handling unit is configured to switch between a cooling-only mode, a first reheating mode, a second reheating mode and a third reheating mode according to the opening and closing of the evaporator, the electric heater, the reheater and the solenoid valve.

[0009] Further preferably, a fan is also provided in the air handling unit.

[0010] Further preferably: the fan is arranged between the evaporator and the electric heater according to the air intake direction of the air flow; or the fan is arranged between the reheater and the electric heater according to the air intake direction of the air flow.

[0011] Further preferably: a one-way throttle valve is also provided in the air handling unit.

[0012] Further preferably, one end of the one-way throttle valve is connected to the evaporator, and the other end is connected to the solenoid valve and the reheater.

[0013] Further preferably, a liquid pipe shut-off valve and a liquid pipe are provided outside the air handling unit.

[0014] Further preferably, one end of the liquid pipe stop valve is connected to the liquid pipe, and the other end is connected to the solenoid valve and the reheater respectively.

[0015] Further preferably, an air pipe stop valve and an air pipe are also provided outside the air handling unit.

[0016] Further preferably, one end of the air pipe stop valve is connected to the air pipe, and the other end is connected to the evaporator.

[0017] Based on the same concept, the utility model also provides an air conditioner, which at least includes an air conditioner outdoor unit and the air handling unit with temperature and humidity control; the air conditioner outdoor unit is connected to the air pipe and liquid pipe outside the air handling unit.

[0018] The embodiment of the utility model has the following advantages due to the adoption of the above technical solution:

[0019] The utility model utilizes the waste heat of condensation through the reheater to increase the wind temperature, reduces the load of the electric heater, and improves the overall energy efficiency; and in a low-temperature environment, the reheater can be closed to avoid excessively low system pressure and unstable system operation; at the same time, the air handling unit can operate in a single cooling mode to meet the needs of strong cooling.

[0020] The above summary is for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the utility model will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural diagram of the utility model.

[0023] Figure 2 This is a schematic diagram of the air handling unit of the utility model in cooling mode only.

[0024] Figure 3 This is a schematic diagram of the air handling unit of the utility model in the first reheat mode.

[0025] Figure 4 This is a schematic diagram of the air handling unit of the utility model in the second reheat mode.

[0026] Figure 5 This is a schematic diagram of the air handling unit of the utility model in the third reheat mode.

[0027] Figure 6 It is a schematic diagram of the air conditioner described in the utility model.

[0028] Figure 7 This is a structural diagram of another form of the utility model.

[0029] Figure numerals: 100 - air handling unit, 101 - liquid pipe stop valve, 102 - solenoid valve, 103 - reheater, 104 - one-way throttle valve, 105 - fan, 106 - evaporator, 107 - electric heater, 108 - gas pipe stop valve, 200 - air conditioner outdoor unit. DETAILED DESCRIPTION

[0030] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0031] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0032] like Figure 1 As shown, an embodiment of the utility model provides an air handling unit 100 with temperature and humidity control, which is provided with at least an evaporator 106 , a reheater 103 , an electric heater 107 and a solenoid valve 102 .

[0033] The reheater 103 is a refrigerant heat exchanger that exchanges heat with the air and utilizes the waste heat of the refrigerant to heat the air.

[0034] Furthermore, the evaporator 106 , the electric heater 107 and the reheater 103 are arranged in sequence in the air handling unit 100 according to the air intake direction; and the evaporator 106 and the reheater 103 are interconnected in the air handling unit 100 through the solenoid valve 102 .

[0035] Further, the air handling unit 100 is configured to switch between a cooling mode only, a first reheat mode, a second reheat mode and a third reheat mode according to the opening and closing of the evaporator 106 , the electric heater 107 , the reheater 103 and the solenoid valve 102 .

[0036] It should be noted that relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0037] In this embodiment, specifically: a fan 105 is further provided in the air handling unit 100 .

[0038] In this embodiment, specifically: the fan 105 is disposed between the evaporator 106 and the electric heater 107 according to the air intake direction of the air flow.

[0039] In this embodiment, specifically: a one-way throttle valve 104 is further provided in the air handling unit 100 .

[0040] In this embodiment, specifically: one end of the one-way throttle valve 104 is connected to the evaporator 106 , and the other end is connected to the solenoid valve 102 and the reheater 103 .

[0041] The working principle of the one-way throttle valve 104 is as follows: Figure 1 The arrow direction is the on state, with no throttling effect, and the reverse direction has a throttling effect, which plays a throttling and voltage reduction role.

[0042] In this embodiment, specifically: a liquid pipe shut-off valve 101 and a liquid pipe are disposed outside the air handling unit 100 .

[0043] In this embodiment, specifically: one end of the liquid pipe stop valve 101 is connected to the liquid pipe, and the other end is connected to the solenoid valve 102 and the reheater 103 respectively.

[0044] In this embodiment, specifically: an air pipe stop valve 108 and an air pipe are further provided outside the air handling unit 100 .

[0045] In this embodiment, specifically: one end of the gas pipe stop valve 108 is connected to the gas pipe, and the other end is connected to the evaporator 106 .

[0046] It should be noted that the gas pipe and liquid pipe are preferably made of copper. Those skilled in the art may also select gas pipes and liquid pipes made of other materials according to actual application requirements, and are not limited to this.

[0047] like Figure 7 As shown, the embodiment of the utility model provides another form of structure of an air handling unit 100 with temperature and humidity control. Figure 1 The difference is:

[0048] The evaporator, the reheater and the electric heater are arranged in sequence in the air handling unit according to the air intake direction.

[0049] And the fan is arranged between the reheater and the electric heater according to the air intake direction of the air flow.

[0050] It should be noted that Figure 7 The connection relationship and functional principle of the remaining components are the same as Figure 1 The structure is consistent with that in , and will not be repeated here.

[0051] The utility model also provides an air conditioner, see Figure 6 , at least includes an air conditioner outdoor unit 200 and the air handling unit 100 with temperature and humidity control; the air conditioner outdoor unit 200 is connected to the air pipe and liquid pipe outside the air handling unit 100.

[0052] When the utility model is working:

[0053] like Figure 2 As shown, the dotted line part represents the closed device. At this time, the air handling unit 100 is in the single cooling mode, the evaporator 106 and the solenoid valve 102 are opened, and the reheater 103 and the electric heater 107 are closed; specifically:

[0054] When the temperature is high and the humidity is high, strong cooling is required and reheating is not required. At this time, the air handling unit 100 operates in a single cooling mode, and the solenoid valve 102 is opened and in a fully open state. Since the resistance of the reheater 103 is large, most of the refrigerant passes through the solenoid valve 102, and the amount of circulating refrigerant in the reheater 103 is extremely low and can be ignored. The electric heater 107 does not work, and the fan 105 works. The fan 105 runs at a preset speed. The high-temperature and high-pressure refrigerant passes through the solenoid valve 102 and enters the one-way throttle valve 104, where it is throttled and reduced to a low-temperature and low-pressure refrigerant. It enters the evaporator 106 for evaporation and heat absorption, and exchanges heat with the air to cool and dehumidify the air. Then the refrigerant returns to the air conditioner outside the air pipe from the gas pipe stop valve 108.

[0055] like Figure 3 As shown, at this time, the air handling unit 100 is in the first reheat mode, the evaporator 106 and the reheater 103 are turned on, and the electric heater 107 and the solenoid valve 102 are turned off; specifically:

[0056] When the indoor temperature and humidity need to be controlled, and the refrigerant has sufficient residual heat, the solenoid valve 102 turns off different refrigerants, the reheater 103 turns on, the electric heating turns off to save energy, and the fan 105 turns on and runs at a preset speed. The high-temperature and high-pressure refrigerant from the air conditioner outdoor unit enters the reheater 103 through the liquid pipe stop valve 101 to exchange heat with the low-temperature air to heat the air. The supercooled high-pressure refrigerant passes through the one-way throttle valve 104 to become a low-temperature and low-pressure refrigerant and enters the evaporator 106 to exchange heat with the air, cooling and dehumidifying the air. The refrigerant then returns to the air conditioner outdoor unit through the gas pipe stop valve 108. The air passes through the evaporator 106 and becomes a low-temperature and high-humidity state. After passing through the reheater 103, the temperature rises and the relative humidity decreases, becoming a medium-temperature and low-humidity state, and then is sent indoors.

[0057] like Figure 4 As shown, at this time, the air handling unit 100 is in the second reheat mode, the evaporator 106, the electric heater 107 and the solenoid valve 102 are turned on, and the reheater 103 is turned off; specifically:

[0058] When the indoor temperature and humidity need to be controlled, but the outdoor ambient temperature is low, in order to maintain the stable operation of the system, the refrigerant cannot provide waste heat. At this time, the reheater 103 needs to be closed, the solenoid valve 102 is opened, and the electric heater 107 is turned on. The rest of the working principle is the same as that in the single cooling mode. After being cooled and dehumidified by the evaporator 106, the air becomes a low temperature and high relative humidity state, and then is heated by the electric heater 107. After the temperature rises, it becomes medium temperature and low relative humidity air and is sent into the room.

[0059] like Figure 5 As shown, at this time, the air handling unit 100 is in the third reheat mode, the evaporator 106, the reheater 103 and the electric heater 107 are turned on, and the solenoid valve 102 is closed; specifically:

[0060] When the indoor temperature and humidity need to be controlled, and the refrigerant waste heat is insufficient to raise the air temperature to the target temperature, the electric heater 107 is turned on to supplement some heat, which can still save energy. Close the solenoid valve 102 to switch off the refrigerant, turn on the electric heating, and turn on the fan 105 to run at a preset speed. The principle on the refrigerant side is the same as the first reheating mode. The difference is that the air is first heated by the electric heater 107, and then heated again by the reheater 103 to finally reach the target temperature.

[0061] It should be noted that the present invention does not limit the rotation speed of the fan 105, and those skilled in the art can set it according to actual application requirements.

[0062] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An air handling unit with temperature and humidity control, at least provided with an evaporator, characterized in that: A reheater, an electric heater and a solenoid valve are also provided; The evaporator, the electric heater and the reheater are arranged in sequence in the air handling unit according to the air intake direction; or the evaporator, the reheater and the electric heater are arranged in sequence in the air handling unit according to the air intake direction; The evaporator and the reheater are connected to each other via a solenoid valve in the air handling unit; The air handling unit is configured to switch between a cooling-only mode, a first reheating mode, a second reheating mode and a third reheating mode according to the opening and closing of the evaporator, the electric heater, the reheater and the solenoid valve.

2. The air handling unit with temperature and humidity control according to claim 1, characterized in that: A fan is also provided in the air handling unit.

3. The air handling unit with temperature and humidity control according to claim 2, characterized in that: The fan is arranged between the evaporator and the electric heater according to the air intake direction of the air flow; Or the fan is arranged between the reheater and the electric heater according to the air intake direction of the air flow.

4. The air handling unit with temperature and humidity control according to claim 1, characterized in that: A one-way throttle valve is also arranged in the air handling unit.

5. The air handling unit with temperature and humidity control according to claim 4, characterized in that: One end of the one-way throttle valve is connected to the evaporator, and the other end is connected to the solenoid valve and the reheater.

6. The air handling unit with temperature and humidity control according to claim 1, characterized in that: A liquid pipe stop valve and a liquid pipe are arranged outside the air handling unit.

7. The air handling unit with temperature and humidity control according to claim 6, characterized in that: One end of the liquid pipe stop valve is connected to the liquid pipe, and the other end is connected to the solenoid valve and the reheater respectively.

8. The air handling unit with temperature and humidity control according to claim 1, characterized in that: An air pipe stop valve and an air pipe are also arranged outside the air handling unit.

9. The air handling unit with temperature and humidity control according to claim 8, characterized in that: One end of the gas pipe stop valve is connected to the gas pipe, and the other end is connected to the evaporator.

10. An air conditioner, characterized in that: At least comprises an air conditioner outdoor unit and an air handling unit with temperature and humidity control as claimed in any one of claims 1 to 9; The air conditioner outdoor unit is connected to the air pipe and liquid pipe outside the air handling unit.

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