337 results about "Dewpoint temperature" patented technology

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.

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.

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.

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.

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 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.

The invention provides a control method and device for condensation prevention of an air conditioner and the air conditioner, and relates to the technical field of air conditioners. The control methodfor condensation prevention of the air conditioner comprises the steps that when the air conditioner is in a zero-wind-sense mode, the indoor moisture content is obtained; if the moisture content islarger than a first preset value, the indoor dew point temperature and the inner disc temperature are obtained; whether a difference value of the indoor dew point temperature and the inner disc temperature is larger than or equal to a second preset value or not is judged; if yes, whether the difference value of the indoor dew point temperature and the inner disc temperature is larger than or equalto a third preset value or not is judged, if yes, whether the upper limit frequency of a compressor is smaller than or equal to a difference value of the maximum frequency of the compressor and a fourth preset value or not is judged, and if yes, the upper limit frequency of the compressor is controlled to be increased; and if the difference value of the indoor dew point temperature and the innerdisc temperature is smaller than the second preset value, the rotating speed of an inner fan is controlled to be increased by a fifth preset value. By means of the control method, the probability of condensation generation of an indoor unit can be reduced while the user experience is improved.

The invention discloses an air conditioning system controlling the air outlet temperature through the dew point temperature and a control method of the air conditioning system, and relates to the technical field of air conditioners. The air conditioning system structurally comprises a compressor, a condenser, an outdoor fan, an outdoor environment temperature sensor, a controller, an air conditioner air return temperature sensor, an air conditioner air return humidity sensor, a first-stage evaporator, an indoor fan, an air conditioner air outlet temperature sensor, a humidifier, a second-stageevaporator, a first-stage flow adjusting valve and a second-stage flow adjusting valve. The compressor, the condenser, the first-stage evaporator, the second-stage evaporator, the first-stage flow adjusting valve and the second-stage flow adjusting valve form a compressor refrigeration and dehumidifying system. The compressor, the outdoor fan, the outdoor environment temperature sensor, the air conditioner air return temperature sensor, the air conditioner air return humidity sensor, the air conditioner air outlet temperature sensor, the humidifier, the first-stage flow adjusting valve and the second-stage flow adjusting valve are electrically connected with the controller and controlled by the controller.