A constant temperature and humidity energy-saving air handling unit and control method thereof

Abstract

The invention discloses a constant temperature and humidity energy-saving air handling unit and a control method thereof, which comprises a shell, wherein a return air port, a fresh air port and a supply air port are respectively arranged on the shell, a heat exchange pipe is arranged in the shell, and the heat exchange pipe comprises an evaporation pipe section and a condensation pipe section, one end of the evaporation pipe section is connected to the fresh air pipe, one end of the fresh air pipe is connected to the fresh air port on the shell, the other end of the evaporation pipe section is connected to a mixing pipe, the side wall of the mixing pipe is connected to the return air port on the shell, the other end of the mixing pipe is connected to a surface cooling pipe, a surface cooler is arranged at a connection part between the mixing pipe and the surface cooling pipe, the end of the surface cooling pipe is connected to the condensation pipe section, the other end of the condensation pipe section is connected to the supply air pipe, and the supply air pipe is connected to the supply air port on the shell. The invention can solve the problem of high energy consumption of reheating air after cooling and dehumidification in the constant temperature and humidity air conditioner in the prior art, save energy, have high energy utilization efficiency and good comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning and refrigeration, and in particular to a constant temperature and humidity energy-saving air handling unit and a control method thereof. Background Art

[0002] In the southern regions with higher temperatures and higher humidity, there is a great demand for constant temperature and humidity air conditioners that can adjust indoor temperature and humidity.

[0003] Traditional air conditioners are usually equipped with surface cooling coils, but no reheating coils. Therefore, they cannot effectively adjust indoor humidity in hot summers, and the air temperature after cooling and dehumidification is too low, which can easily cause condensation at the air outlet and poor comfort. Therefore, it is generally necessary to reheat the air after cooling and dehumidification to reach the set air supply temperature. Existing constant temperature and humidity air conditioners usually use electric heating or boiler appliances as heating sources, resulting in additional energy consumption. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a constant temperature and humidity energy-saving air handling unit and a control method thereof, which can solve the problem of high energy consumption of reheating air after cooling and dehumidification in the constant temperature and humidity air conditioner in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A constant temperature and humidity energy-saving air handling unit is provided, which includes an outer shell, on which a return air inlet, a fresh air inlet and an air supply inlet are respectively arranged, a heat exchange tube is arranged in the outer shell, and the heat exchange tube includes an evaporation tube section and a condensation tube section, one end of the evaporation tube section is connected to the fresh air tube, one end of the fresh air tube is connected to the fresh air inlet on the outer shell, the other end of the evaporation tube section is connected to a mixing tube, the side wall of the mixing tube is connected to the return air inlet on the outer shell, the other end of the mixing tube is connected to a surface cooling tube, a surface cooler is arranged at the connecting part of the mixing tube and the surface cooling tube, the end of the surface cooling tube is connected to the condensation tube section, the other end of the condensation tube section is connected to the air supply tube, and the air supply tube is connected to the air supply inlet on the outer shell.

[0007] In the above technical solution, preferably, an electric auxiliary heater is provided in the air supply duct.

[0008] In the above technical solution, preferably, the fresh air duct and the mixing duct are connected to each other through a regulating tube.

[0009] In the above technical solution, preferably, a regulating valve is provided on the regulating pipe.

[0010] In the above technical solution, preferably, temperature sensors are provided in both the air supply pipe and the mixing pipe.

[0011] In the above technical solution, preferably, a controller is arranged in the housing, and the temperature sensor and the regulating valve are electrically connected to the controller respectively.

[0012] The main beneficial effects of the constant temperature and humidity energy-saving air handling unit provided by the present invention are:

[0013] The present invention provides a mixing tube and a fresh air outlet, so that the fresh air is exchanged with the evaporating tube section of the heat exchange tube, the temperature of the heat exchange tube is increased, and the temperature of the fresh air after the heat exchange is reduced, and then it is mixed with the return air with a lower temperature, so as to reheat the return air, and then the mixed gas is cooled by the surface cooler and heated again by the condensing tube section, so that the air that meets the supply air temperature requirement can be discharged from the supply air outlet.

[0014] After the outdoor fresh air passes through the heat exchange tube, it is mixed with the return air, so that the outdoor fresh air is used as a reheating heat source, eliminating the general reheating heat source. At the same time, the temperature of the outdoor fresh air is reduced after heat exchange, thereby reducing the energy consumption of fresh air processing. After the fresh air and return air are mixed, they are cooled and dehumidified by the surface cooler, and then reheated by the condensing pipe section of the heat exchange tube to reach the set supply air temperature. Compared with the prior art of heating by heat source, the heat exchange of the heat exchanger can effectively save energy, and there is no need to further adjust the temperature, which improves the energy utilization efficiency and can improve human comfort.

[0015] When the outdoor temperature is low, an electric auxiliary heater is installed to reheat the return air and fresh air mixture after cooling and dehumidification, thereby effectively ensuring the supply air temperature. At the same time, since the electric auxiliary heater does not need to directly heat the return air to the supply air temperature, but exchanges heat with the fresh air, when the temperature entering the supply air duct does not reach the set temperature, additional heating is performed. Therefore, its energy consumption is smaller than the existing structure, and the energy utilization efficiency is also higher.

[0016] By setting regulating valves and regulating pipes, when the outdoor temperature is high and the temperature of the mixed gas entering the supply air pipe is still higher than the set temperature, the regulating valve can be opened to allow the regulating pipe to allow the fresh air to bypass the heat exchange pipe and directly enter the mixing pipe to mix directly with the return air, skipping the step of reheating the mixed gas by the heat exchange pipe to reduce the supply air temperature, thereby maximizing the use of the gas's own heat and maximizing energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Among them, 1. shell, 11. return air inlet, 12. fresh air inlet, 13. supply air inlet, 2. fresh air duct, 3. heat exchange tube, 31. evaporation tube section, 32. condensation tube section, 4. mixing tube, 41. regulating tube, 42. regulating valve, 43. temperature sensor, 44. controller, 5. surface cooling tube, 51. surface cooler, 6. supply air duct, 61. electric auxiliary heater. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings:

[0020] like Figure 1 As shown, it is a structural schematic diagram of a constant temperature and humidity energy-saving air handling unit.

[0021] The constant temperature and humidity energy-saving air handling unit of the present invention comprises a housing 1, on which a return air inlet 11, a fresh air inlet 12 and an air supply inlet 13 are respectively arranged, and the three openings are respectively located in different directions on the housing 1 to avoid mutual interference.

[0022] The shell 1 is provided with a heat exchange tube 3, through which the heat exchange tube 3 is used to achieve heat exchange and dehumidification of the fresh air and the mixed air. The heat exchange tube 3 includes an evaporation tube section 31 and a condensation tube section 32. One end of the evaporation tube section 31 is connected to the fresh air tube 2, and the return air port 11 is connected to the fresh air tube 2 on the shell 1. The other end of the evaporation tube section 31 is connected to the mixing tube 4, so as to exchange heat with the fresh air, cool the fresh air, increase the temperature of the heat exchange tube 3, and send the fresh air after heat exchange into the mixing tube 4; the side wall of the mixing tube 4 is connected to the return air port 11 on the shell 1, so as to mix the return air with the fresh air. By exchanging heat with the fresh air, the heat exchange tube 3 is heated, and then mixed with the return air, which can effectively achieve the pre-heating effect, avoid the additional setting of the heating source, and consume additional energy.

[0023] The other end of the mixing tube 4 is connected to the surface cooling tube 5, and a surface cooler 51 is provided at the connection portion between the mixing tube 4 and the surface cooling tube 5. The end of the surface cooling tube 5 is connected to the condensing tube section 32, and the other end of the condensing tube section 32 is connected to the air supply pipe 6. The mixed air is cooled and dehumidified by the surface cooler 51, and then heated and heated by the condensing tube section 32. The air supply pipe 6 is connected to the air supply port 13 on the outer casing 1 to send out the treated air.

[0024] Preferably, an electric auxiliary heater 61 is provided in the air outlet 13. When the outdoor temperature is low, the mixed gas is heated by the electric auxiliary heater 61 to ensure that the air delivered reaches the set temperature.

[0025] An inter-connected regulating pipe 41 is provided between the fresh air pipe 2 and the mixing pipe 4. A regulating valve 42 is provided on the regulating pipe 41. When the outdoor temperature is high, the fresh air bypasses the heat exchange pipe 3 and is directly sent to the mixing pipe 4 through the regulating pipe 41, and is mixed with the return air to avoid overheating the heat exchange pipe 3, thereby reducing the reheating effect of the condensing pipe section 32 on the mixed gas, so as to reduce the supply air temperature, thereby maximizing the use of the gas's own heat and maximizing the energy utilization efficiency.

[0026] Temperature sensors 43 are provided in the air supply port 13 and the mixing tube 4 to monitor the temperature of the mixed air and the air in the air supply tube 6. When the temperature of the mixed air is high, the regulating valve 42 is opened to directly connect the fresh air tube 2 with the mixing tube 4.

[0027] A controller 44 is provided in the housing 1, and the temperature sensor 43, the regulating valve 42, and the electric auxiliary heater 61 are electrically connected to the controller 44. The controller 44 is a single chip microcomputer. Through the controller 44, the operation of each component is adjusted to adapt to different working conditions.

[0028] The following is a description of the working process of this program:

[0029] The fresh air enters the fresh air duct 2 from the fresh air inlet 12, and exchanges heat through the evaporation tube section 31 of the heat exchange tube 3, so that the temperature of the fresh air drops, and the temperature of the heat exchange tube 3 of the heat exchanger rises. Then the fresh air enters the mixing tube 4 and mixes with the return air entering from the return air inlet 11. The mixed gas is cooled and dehumidified by the surface cooler 51, and then passes through the condensation tube section 32 for heat exchange and temperature increase, so that air that meets the supply air temperature requirement can be discharged from the supply air outlet 13.

[0030] The above describes the specific embodiments of the present invention to facilitate those skilled in the art to understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A control method for a constant temperature and humidity energy-saving air handling unit, characterized in that: The constant temperature and humidity energy-saving air handling unit comprises a shell, on which a return air inlet, a fresh air inlet and an air supply inlet are respectively arranged, a heat exchange tube is arranged in the shell, the heat exchange tube comprises an evaporation tube section and a condensation tube section, one end of the evaporation tube section is connected to the fresh air duct, one end of the fresh air duct is connected to the fresh air inlet on the shell, the other end of the evaporation tube section is connected to the mixing tube, the side wall of the mixing tube is connected to the return air inlet on the shell, the other end of the mixing tube is connected to the surface cooling tube, a surface cooling device is arranged at the connecting part of the mixing tube and the surface cooling tube, the end of the surface cooling tube is connected to the condensation tube section, the other end of the condensation tube section is connected to the air supply pipe, the air supply pipe is connected to the air supply inlet on the shell, an electric auxiliary heater is arranged in the air supply pipe, the fresh air duct and the mixing tube are mutually connected through a regulating tube, a regulating valve is arranged on the regulating tube, a temperature sensor is arranged in the air supply pipe and the mixing tube, a controller is arranged in the shell, and the temperature sensor and the regulating valve are electrically connected to the controller respectively; The control method of the controller comprises the following steps: When the outdoor temperature or the mixed air temperature is higher than the indoor temperature, the regulating valve is opened to send the fresh air directly into the mixing tube bypassing the heat exchange tube and mixing with the return air; otherwise, the regulating valve is closed; when the outdoor temperature is lower than the indoor temperature, the mixed gas is heated by the electric auxiliary heater until the delivered air reaches the set temperature.

2. A constant temperature and humidity energy-saving air handling unit, characterized in that: The invention comprises a shell, on which a return air inlet, a fresh air inlet and an air supply inlet are respectively arranged, a heat exchange tube is arranged in the shell, and the heat exchange tube comprises an evaporation tube section and a condensation tube section, one end of the evaporation tube section is connected to the fresh air tube, one end of the fresh air tube is connected to the fresh air inlet on the shell, the other end of the evaporation tube section is connected to the mixing tube, the side wall of the mixing tube is connected to the return air inlet on the shell, the other end of the mixing tube is connected to the surface cooling tube, a surface cooler is arranged at the connection part of the mixing tube and the surface cooling tube, the end of the surface cooling tube is connected to the condensation tube section, the other end of the condensation tube section is connected to the air supply tube, the air supply tube is connected to the air supply inlet on the shell, an electric auxiliary heater is arranged in the air supply tube, the fresh air tube and the mixing tube are connected to each other through a regulating tube, a regulating valve is arranged on the regulating tube, a temperature sensor is arranged in the air supply tube and the mixing tube, a controller is arranged in the shell, and the temperature sensor and the regulating valve are electrically connected to the controller respectively; The control method of the controller comprises the following steps: When the outdoor temperature or the mixed air temperature is higher than the indoor temperature, the regulating valve is opened to send the fresh air directly into the mixing tube bypassing the heat exchange tube and mixing with the return air; otherwise, the regulating valve is closed; when the outdoor temperature is lower than the indoor temperature, the mixed gas is heated by the electric auxiliary heater until the delivered air reaches the set temperature.

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