342 results about "Dewpoint temperature" patented technology

The present invention relates to a continuous gas phase process comprising polymerizing one or more hydrocarbon monomer(s) in a fluidized bed reactor in the presence of catalyst system or polymerization catalyst and a condensable fluid for a period of at least 12 hours where the bed temperature is less than the Critical Temperature and the dew point temperature of the gas composition in the reactor is within 25° C. of the bed temperature.

The invention discloses a space environmental temperature and humidity control method and a control device thereby. In the method, a controller controls the operation of an actuating mechanism used for adjusting temperature and humidity according to temperature and humidity monitoring results so as to control the temperature and humidity of air; according to the required temperature and relative humidity of a target space, a set air dew-point temperature value of a mixed air section is set in advance in a storage; the controller compares a monitored air dew-point temperature monitored value of the mixed air section, which is monitored by a dew-point temperature sensor, with the set air dew-point temperature value of the mixed air section, which is set in advance, and judges whether the actuating mechanism is used to cool the air to lower the humidity or not; and after the adjustment decision is made, a temperature control procedure starts. Since the monitoring adjustment decision making step of the air dew-point temperature value of the mixed air section is repeated according to a set cycle in the running process of an air conditioning unit, the method can carry out necessary control of lowering humidity, raising or reducing temperature as required. The invention not only can greatly save energy, but also can stabilize a control system and realize high-accuracy control by using the control system, the temperature control and the humidity control of which are not interfered.

The embodiment of the invention provides an air conditioner defrost control method, an air conditioner defrost control device and an air conditioner, relates to the technical field of air conditioners, and solves the problem that the air conditioner in the prior art is inaccurate in defrost judgment. The method comprises the steps of when the air conditioner starts a heating function, acquiring outdoor environment parameters and an outdoor coil temperature, wherein the outdoor environment parameters comprise an outdoor environment temperature and outdoor environment humidity; determining a dewpoint temperature according to the outdoor environment parameters, and determining whether a heat exchanger of an outdoor unit of the air conditioner is frosted or not according to the dew point temperature and the outdoor coil temperature; and when determining that the heat exchanger of the outdoor unit is frosted, controlling the air conditioner to start a defrosting function. The embodiment ofthe invention is applied to the manufacturing the outdoor unit.

The invention provides a control method and device of an air conditioner and the air conditioner. The control method of the air conditioner comprises the steps that in the condition that the air condition is in a refrigeration mode or a dehumidification mode, when the air conditioner is shut down or subjected to timing shutdown, the operation time of a compressor is detected; the operation time is compared with a first preset threshold and a second preset threshold; when the operation time is larger than the first preset threshold and smaller than or equal to the second preset threshold, the indoor environment temperature T1 and humidity RH and the temperature T2 of an evaporator coil are detected; the dew-point temperature T<dew> is calculated according to the indoor environment temperature T1 and humidity RH; whether the temperature T2 of the evaporator coil is smaller than the dew-point temperature T<dew> or not is judged; when the judgment result is yes, the air conditioner is controlled to start a drying and mould proof mode; and when the judgment result is no, the air conditioner is controlled to be shut down directly; and the first preset threshold is smaller than the second preset threshold. By means of the technical scheme, whether the drying and mould proof mode function is started is judged automatically, so that the air conditioner is more intelligent and humanized.

An automotive vehicle defogging system prevents dissipation of energy required to defog the automotive vehicle wind shield. A surface temperature sensor mounted on the wind shield detects the glass surface temperature. A humidity sensor spaced from the wind shield glass by a predetermined distance detects the humidity around the wind shield. A peripheral temperature sensor mounted inside from the wind shield glass detects peripheral temperature around the glass. Dew point temperature is obtained in response to the detected humidity H and a temperature value based on the temperatures detected by the surface and peripheral temperature sensors. The presence of fog is detected by comparing the dew point temperature with the surface temperature Ts.

A system for improving operation of an engine having a particulate matter sensor is presented. The system may be used to improve engine operation during cold starts especially under conditions where water vapor or entrained water droplets are present in vehicle exhaust gases. In one embodiment, particulate sensor degradation is indicated in response to an output of said particulate matter sensor staying below a threshold as engine temperature increases past the dewpoint temperature.

The invention provides a constant-humidity refrigeration method and a system. The method comprises the following steps: a set target environment temperature is obtained, and an indoor environment temperature and a preset target humidity range are obtained every preset time; a dew point temperature is looked up from a table according to the obtained indoor environment temperature and preset target humidity range; the found dew point temperature is set as a target evaporation temperature of the operation of an air conditioning evaporator; and an operation frequency of a compressor is adjusted according to a difference value between a present evaporation temperature and the target evaporation temperature of the air conditioning evaporator until the indoor environment temperature reaches the target environment temperature. When the indoor target environment temperature is precisely controlled, the indoor humidity is guaranteed without causing excessive indoor dryness, so that the uncomfortable body condition of users is prevented, and the user experience of air conditioners is enhanced.

A variety of refrigerators and merchandisers having glass or plastic substrates that are substantially fog-resistant are provided. For example, refrigerator doors having a substantially transparent substrate including an anti-fog coating on at least a portion thereof are provided. The portion of the substrate may substantially not fog when the portion has an initial surface temperature and is then exposed to a moist air ambient with a dewpoint temperature equal to or greater than the surface temperature for a period of time. The surface temperature may be less than about 0° C. and the period of time may be greater than about 6 seconds.

This invention is an integrated system comprised of a flat plate, air-to-air heat exchanger, ducting and controls, and an AZFlow™ direct evaporative cooler in configurations where the system is able to provide air that has been cooled well below the ambient wet-bulb to temperatures approaching the dew point. These include: A) a two stage cooler where one evaporative cooler performs the stage one cooling by direct evaporative cooling, of the ambient air. This air is directed to the secondary side of the air to air heat exchanger where it indirectly and sensibly cools primary air which is then cooled by a second evaporative cooler which is able to produce the desired cool air approaching the dew point; B) an energy recovery cooling system where building exhaust is collected and directed to the secondary side of the air to air heat exchanger where it indirectly and sensibly cools primary air which is then cooled by an evaporative cooler which is able to produce the desired cool air approaching the dew point; C) an indirect evaporative cooler where an evaporative cooler performs direct evaporative cooling of the ambient air. This air is directed to the secondary side of the air to air heat exchanger where it indirectly and sensibly cools primary air. This sensibly cooled primary air can be used as input to a broad number of applications including but not limited to: inlet air to cooling towers producing water chilled to temperatures approaching the dew point which itself has a broad range of uses, and building makeup air in areas other than the most humid where cooling the air below ambient conditions reduces the energy required to maintain the building environment.

The invention relates to a heating control device and a heating control method for condensation resistance of a refrigerating vertical beam of a side-by-side combination refrigerator. The heating control device comprises a heater positioned on the vertical beam, an environmental temperature sensor and a control unit, wherein the environmental temperature sensor can output signals to the control unit according to collected environmental temperature values, and the control unit can output signals to control the heater to work. The control method can set the relative humidity as a constant value according to related condensation resistance applicable standards, and the control unit can control working modes of the heater with power as the constant value according to the environmental temperature values collected by the environmental temperature sensor. The heating control device and the heating control method adopt the low-cost environmental temperature sensor and a single environmental temperature parameter variable to control the condensation-resistant heater, thereby reducing cost, simplifying procedures and simultaneously guaranteeing stability and reliability of a system. By means of the heating control device and the heating control method, humidity corresponding to standard dew-point temperature can be set as a safety constant, thereby reducing the parameter viable and simplifying the control method.

A respiratory assistance apparatus (4) is provided, adapted to deliver gases to a user or patient (1). The apparatus (4) comprises a housing (10) provided with a chamber (5) and a heater (25), the chamber (5) comprising at least one gas port (15) connected to, or arranged to be connected to, at least one intermediate passageway (12). The apparatus (4) is operative according to a disinfection mode of predetermined profile in which the heater (25) heats liquid in the chamber (5) to produce vapour at or above a target dewpoint temperature and / or humidity level. The apparatus (4) is arranged such that the vapour is delivered to the intermediate passageway (12) to disinfect the intermediate passageway (12) with moist heat throughout a predetermined duration of the disinfection mode. Associated attachments and methods are also provided.

A refining system for refining a feed gas (10) includes a first and a second component, the first component having a lower dew point temperature than the second component; the refining system including:—an input section (105) for input of the feed gas including a dehydration unit for dehydrating the feed gas, capable of obtaining a water dew point between −45 and −65° C.;—a pre-cooling section (110) coupled to the input section for receiving the dehydrated feed gas;—a fractionation section (115) coupled to the pre-cooling section for receiving the pre-cooled stream;—an expansion cooling and separation section (120) coupled to the fractionation section for receiving the fractionated gas, including a cyclonic separator device (240); the expansion cooling and separation section having an reflux conduit coupled to the fractionation section for reflux (24) of liquid enriched with the second component to the fractionation section.

The invention provides an air conditioner and an anti-condensation control method thereof. The anti-condensation control method comprises the steps that when the air conditioner enters a condensationdetection state, the air outlet temperature of an air outlet of an indoor unit is detected, and the dew point temperature is obtained; whether the air outlet temperature is lower than the condensationtemperature or not is judged; if the air outlet temperature is lower than the condensation temperature, the temperature difference between the air outlet temperature and the dew point temperature iscalculated, and the temperature difference is judged; if the temperature difference meets the first condensation condition, the rotating speed of an indoor fan is increased or the running frequency ofa compressor is reduced; and if the temperature difference meets the second condensation condition, the rotating speed of the indoor fan is increased, the operation frequency of the compressor is reduced according to a first frequency threshold value, or the operation frequency of the compressor is reduced according to a second frequency threshold value. Therefore, by judging the temperature difference between the air outlet temperature and the dew point temperature, the risk of condensation is divided into different levels, different control strategies are adopted for different condensationrisk levels, so that anti-condensation treatment can be effectively carried out.

The invention provides an anti-frosting method and system for an air conditioner. The method includes the steps that meteorological parameters of the area where the air conditioner is located are obtained, wherein the meteorological parameters comprise temperature information and humidity information of the area where the air conditioner is located; according to the temperature information and the humidity information of the meteorological parameters, the dew point temperature of the area where the air conditioner is located is obtained; and according to the dew point temperature, operation parameters of the air conditioner are adjusted, so that the low-pressure temperature corresponding to operation low pressure of the air conditioner is higher than or equal to the dew point temperature. The air conditioner is well combined with the meteorological parameters of the area where the air conditioner is located, the dew point temperature of the area where the air conditioner is located is worked out through the meteorological parameters, operation of the air conditioner is adjusted according to the dew point temperature, the low-pressure temperature corresponding to the operation low pressure of the air conditioner is always higher than or equal to the dew point temperature of the area where the air conditioner is located, and therefore the air conditioner is free of a defrosting phenomenon even in the environment where the temperature is low and humidity is increased, the heat exchange effect of the air conditioner cannot become bad since the air conditioner does not frost, and the heating effect of the air conditioner is effectively improved.

The invention discloses a dehumidification control method of an air conditioner. The method comprises the following steps of controlling the air conditioner to enter a dehumidification mode, and detecting the indoor environment temperature; determining a current relative humidity parameter; searching for a dew point temperature corresponding to the current relative humidity at the indoor environment temperature according to the relationship among a preset relative humidity parameter, the indoor environment temperature and dew point temperature, and determining a dew point temperature range corresponding to the current dehumidification mode according to the dew point temperature; and controlling the temperature of an indoor coil pipe within the dew point temperature range according to the adjusted operating parameters until the operating mode of the air conditioner is switched or the air conditioner is switched off. The embodiment of the invention further discloses the air conditioner.The purpose of dehumidification without cooling is realized by increasing no hardware. Meanwhile, due to the fact that a plurality of different dehumidification modes are set, dehumidification comfortrequirements of different environments are met.

The invention discloses a humidity control method and device. Firstly, the current temperature and current dew-point temperature of the circulating air are detected, and whether the current temperature of the circulating air is within the set dew-point temperature control range or not is judged. If yes, the humidification and dehumidification states of a unit are controlled in order to adjust the dew-point temperature and relative humidity of the circulating air, and the dew-point temperature of the processed circulating air is made to be not lower than the set the minim dew-point temperature value but not higher than the maximum dew-point temperature value, and the relative humidity of the processed circulating air is made to be not higher than the maximum relative humidity value. In other words, the humidity is controlled through the dew-point temperature according to the physical properties of the air, the influence of temperature on the relative humidity is avoided, and therefore the situation that an air conditioner carries out dehumidification while carrying out humidification is avoided to the maximum extent. Not only are the effects of saving energy and water achieved, but also the possibility of temperature and humidity fluctuation of the processed air is lowered, and the reliability and accuracy of temperature and humidity control are improved.

The invention provides a dehumidification control method and system which are applied to electric appliances which have a dehumidification function. According to the method and system, the electric appliances which have the dehumidification function judge whether preset relative humidity is lower than the relative humidity of the environment after receiving a dehumidification command sent by a user during operation, only draught fans of the electric appliances operate if not, whether the current temperature meets a preset dehumidification temperature condition is further judged if yes, compressors are started if yes, and only the draught fans of the electric appliances operate if no. Under the condition that both the compressors and the draught fans operate, the intra-tube temperature of a dehumidification part and the dew point temperature corresponding to the indoor environment are detected at intervals of t1, dehumidification is continued if it is detected that the intra-tube temperature of the dehumidification part is lower than the dew point temperature corresponding to the indoor environment, and if it is detected that the intra-tube temperature is higher than the dew point temperature for a period of t2, the dehumidification effect is invalid, dehumidification is stopped, and then electric energy is saved.

The invention relates to the technical field of a fuel battery, and discloses a method and device for recovering the fuel battery electric pile performance. The method for recovering the fuel batteryelectric pile performance comprises the following steps of starting a load; loading the current to 200A; enabling the fuel battery electric pile to continuously operate for 5min at 200A; setting the temperature difference of the fuel battery electric pile, the temperature of cooling water, the temperature of the air, the temperature of hydrogen gas, the dew point temperature of the air and the dewpoint temperature of the hydrogen gas; enabling the pressure of the hydrogen gas to be higher than the pressure of the oxygen; loading the current from 200 A to 300 A; continuously operating the fuelbattery electric pile for 30min at 300A; if the output power of the of the fuel battery electric pile equals to or is higher than the preset power, or the average voltage equals to or is higher thanthe preset voltage, the fuel battery electric pile performance recovery is completed. The method for recovering the fuel battery electric pile performance of the embodiment is simple and convenient; the realization is easy; the performance of the fuel battery electric pile in a non-operation state for a long time can be fast recovered, so that the performance recovery efficiency of the fuel battery electric pile is improved.

In a printing apparatus improvement of drying ability and reduction of consumed power are concurrently achieved by improving the efficiency of drying ink. More concretely, hot air is blown onto a print medium printed by ink, and a portion of the blown hot air is recovered and blown again. Before the hot air is blown, the print medium is heated by a preheating unit, making it higher than the dew point temperature of the blown hot air.

The invention discloses an anti-condensation device with self-adaptation control and a control method. The anti-condensation device with self-adaptation control and the control method comprise a temperature and humidity sensor which is used for detecting the environmental temperature and humidity, an electronic condensation component which is used for condensation dehumidification, a temperature sensor which is used for detecting the temperature of a condensation end, a temperature sensor which is used for detecting the temperature of a heat dissipation end, and a central control unit which is used for controlling the electronic condensation component. The electronic condensation component comprises the condensation end, the heat dissipation end, an electronic refrigeration element and a heat dissipation fan. The central control unit is provided with a firmware program. The central control unit is characterized in that the central control unit can monitor the environmental temperature and humidity sensor when the anti-condensation device is in the dehumidification mode, and search in a 'dew point temperature table' according to the obtained environmental temperature and humidity values to obtain the corresponding dew point temperature value; meanwhile, comparison between the temperature value of the condensation end and the temperature value of a dew point is conducted to drive the start-up and shut-down of the electronic refrigeration element. Therefore, the power consumption can be decreased, and the dehumidifying effect can be optimized under different circumstances.

Disclosed is a control method and device for a heat-adsorption-free air drier. A programmable logic controller (PLC) is used as a control center, a dew point temperature and pressure dew point transducer is arranged at an air outlet end, the dew point temperature of the air outlet end and a pressure dew point of an air outlet are monitored through the dew point temperature and pressure dew point transducer, meanwhile, a temperature transducer is arranged at the position of an air inlet, the temperature transducer of the air inlet is monitored, a pressure transducer is mounted at the position of an air control combined valve silencer to collect abnormal pressure signals, data values obtained by all transducers are fed back to the PLC, and the PLC controls the operation of the heat-adsorption-free drier according to collected data information of all transducers.

The invention discloses a method for regulating the indoor air environment by regulating enthalpy value of indoor exhaust air, i.e. regulating the state of indoor exhaust air until its enthalpy value approaches to the enthalpy limit value. On the refrigerating condition, the state of the enthalpy limit value of the indoor exhaust air is that the wet ball temperature is equal to the highest dry ball temperature occurring in the regulating course; on the heating condition, the state is that the wet ball temperature is equal to the lowest dew point temperature. The invention has the technical effects of high efficiency and saving energy, and ability to provide new air and increase indoor net refrigeration quantity and simultaneously reduce energy consumption.

The invention discloses a method and device for controlling a dehumidifier and the dehumidifier. The method includes the steps of receiving an object-drying-mode running command, and controlling the dehumidifier to run in the object drying mode according to the running command; after the dehumidifier runs by preset time, detecting the condenser temperature, the air inlet drying ball temperature, the air inlet relative humidity, the evaporator temperature and a preset condenser temperature maximum value of the dehumidifier; calculating the dew point temperature according to the air inlet drying ball temperature and the air inlet relative humidity; judging whether the relationships among the condenser temperature, the air inlet drying ball temperature, the air inlet relative humidity, the evaporator temperature and the dew point temperature meet preset conditions or not; if the relationships among the condenser temperature, the air inlet drying ball temperature, the air inlet relative humidity, the evaporator temperature and the dew point temperature meet preset conditions, obtaining a first difference value between the preset condenser temperature maximum value and the condenser temperature; adjusting the running frequency of a compressor and the opening degree of an expansion valve of the dehumidifier according to the first difference value. By means of the method, the blown heat can be effectively used for drying clothes, and energy losses can be reduced.

The invention discloses an anti-condensation control method and device for an air conditioner, the air conditioner and a readable storage medium. The method comprises the steps of acquiring an air temperature and an air humidity which are corresponding to a power module in the air conditioner, and acquiring the coil pipe temperature of a heat dissipation coil pipe corresponding to the power module; determining the dew point temperature according to the air temperature and the air humidity; adjusting the opening of a throttling part in the air conditioner if the temperature of the coil pipe issmaller than the dew point temperature so as to increase the temperature of the coil pipe, and condensation of the power module is prevented. According to the anti-condensation control method and device, by adjusting the opening of the throttling part, the problem that in the heat dissipation process of the power module, condensation of the power module is caused is solved. Normal operation of thepower module of the air conditioner is guaranteed in the heat dissipation process of the power module, that is to say, normal operation of the air conditioner is guaranteed.

The invention discloses a frequency conversion air conditioner and a condensation prevention control method thereof. The method comprises the steps of S1, performing refrigeration startup; S2, judgingwhether a compressor continuously runs for first duration or not, and if no, entering in a common refrigeration control mode; S3, if yes, judging whether indoor environment temperature T1 and outdoorenvironment temperature T4 meet the condition that the indoor environment temperature T1 is larger than or equal to 24 DEG C and smaller than or equal to 30 DEG C, and the outdoor environment temperature T4 is larger than or equal to 24 DEG C and smaller than or equal or 30 DEG C or not; S4, if yes, judging whether the rotating speed of an indoor fan is k times smaller than rated rotating speed or not, wherein k is taken from 50 to 60%; and S5, if yes, entering in the condensation prevention control mode, and under the condensation prevention control mode, through comparison of the range of the temperature difference between the dew point temperature and the temperature of an indoor evaporator, adjusting the running frequency of the compressor. Therefore, through judging whether the indoor environment temperature and the outdoor environment temperature are within the preset temperature range or not, and in combination with the rotating speed of fan running, whether the condensation prevention control mode is executed or not is judged, the temperature of the indoor evaporator is made to be higher than the dew point temperature, and the condensation is reduced.

The invention provides a low temperature environment free of condensed system, comprising a refrigeration air supply cooling device, a refrigeration liquid supply cooling device, a constant temperature surging tank, a PLC control box, wherein a cold plate is arranged in the constant temperature surging tank, the refrigeration liquid supply cooling device is connected with the cold plate through a liquid supply pipe and a liquid return pipe, while the refrigeration air supply cooling device is connected with the constant temperature surging tank through an air supply pipe and an air return pipe. The PLC control box respectively controls the refrigeration liquid supply cooling device and the refrigeration air supply cooling device. The refrigeration liquid supply cooling device keeps the temperature of the cold plate in -10 to 50 DEG C, and the refrigeration air supply cooling device keeps the temperature in the constant temperature surging tank a little lower than the dewpoint temperature of the cold plate, thereby ensuring no condensation in the constant temperature surging tank. Pressure in the constant temperature surging tank is not lower than 800 Pa, causing highly wet air outside not to enter the tank, thereby increasing working reliability of cold plate. The system is reliable in operation, high efficient in heat emission, which builds a low temperature environment free of condensation, thereby effectively protecting the electronic device.

A geothermal desiccant cycle cools and dehumidifies the air in an indoor conditioned space. The return air is split into two streams. One of the streams passes through a desiccant wheel to remove water vapor and then through a cooling coil for sensible cooling from geothermal water. The other stream is heated to increase its capacity to absorb moisture, and then is passed through the desiccant wheel to pick up the moisture transferred from the first stream and regenerate the desiccant. The second air stream, which now has a higher dewpoint temperature, flows through a geothermal cooling coil, for sensible cooling as well as condensation of the moisture. The two air streams are mixed and supplied back to the conditioned space. A regenerative air-air heat exchanger can be used to recover some of the heat used in heating the second air stream.

The invention provides an air conditioner condensation preventing control method and an air conditioner, and relates to the technical field of air conditioners. The control method comprises the stepsthat the inner disc temperature T1 and the inner ring dew point temperature T2 are detected; and whether the condensation risk exists or not is judged according to the inner disc temperature T1 and the inner ring dew point temperature T2; when the condensation risk exists, the step number of an electronic expansion valve is controlled to be increased or the frequency of a compressor is controlledto be reduced. Accordingly, when the condensation risk is detected, the step number of the electronic expansion valve is controlled to be increased, the flow of a refrigerant can be increased, or thefrequency of the compressor is reduced, the temperature of the refrigerant is increased, accordingly, the surface water evaporation efficiency of an indoor evaporator is improved, the water accumulating amount in the system is reduced, and condensation is avoided. In the whole process, air outlet temperature fluctuation is not caused, constant-temperature dehumidification is achieved, the dehumidification amount is large, and dehumidification is stable.