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Air temperature and humidity testing device and temperature and humidity control method using same

A test device, temperature and humidity technology, applied in the direction of measuring device, non-electric variable control, control/regulation system, etc., can solve the problems of wet bulb gauze freezing, inability to measure wet bulb temperature with platinum resistance, and influence of test accuracy, etc., to achieve The effect of improving accuracy

Active Publication Date: 2019-11-22
CHINA NAT ELECTRIC APP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Platinum resistance is a high-precision thermistor. Platinum resistance can accurately measure the temperature values ​​of dry bulb and wet bulb. However, the application of platinum resistance is limited. When the ambient temperature is below 0°C, the wet ball gauze will freeze. , the temperature of the wet bulb cannot be measured by platinum resistance, so in the environment below 0 ℃, we have to make a second choice and use other temperature sensors to measure the temperature of the wet bulb, which will affect the test accuracy

Method used

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  • Air temperature and humidity testing device and temperature and humidity control method using same
  • Air temperature and humidity testing device and temperature and humidity control method using same
  • Air temperature and humidity testing device and temperature and humidity control method using same

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Effect test

Embodiment 1

[0035] Such as figure 1 A kind of air temperature and humidity testing device shown, comprises ventilation tube 2, and described ventilation tube is provided with air inlet and outlet, and it is a kind of flexible pipe that material is PP, and flexible pipe is built-in thread type steel wire support, and outsourcing has Insulation sleeve, during the test, the vent pipe cannot be in contact with the wall, the ground and other objects, and the heat exchange between the air in the vent pipe and the outside world should be avoided as much as possible. The air pipe 2 is provided with a heater 3 for heating the air entering the air pipe. The heater is composed of a quartz heating pipe and a stainless steel shell. The stainless steel shell is made of a 1.2mm thick stainless steel plate processed by sheet metal. , The heating power is 3.6kW, and its full power output can ensure that the sampled air in the ventilation pipe is heated to the preset value. The ventilation pipe 2 after th...

Embodiment 2

[0049] This embodiment is a method for controlling temperature and humidity using the air temperature and humidity testing device in Embodiment 1. According to GBT 7725-2004 "Room Air Conditioner", the constant temperature and humidity environment used for equipment testing clearly stipulates several dry bulb temperature values ​​and wet bulb temperature values ​​for the required indoor test environment. This embodiment can provide an indoor environment conforming to the environmental working condition parameters specified in the standard. And the control accuracy of temperature and humidity is higher. The method to obtain the required indoor test environment is as follows:

[0050] Such as figure 2 As shown, the signal output end of the second controller of the air temperature and humidity testing device in Embodiment 1 is connected to a humidification module for adjusting the indoor air humidity, and the signal output end of the third controller is connected to a heating m...

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Abstract

The invention provides an air temperature and humidity testing device and a temperature and humidity control method using the same. The testing device comprises a breather pipe; a heater is arranged on the breather pipe; a first platinum resistor for measuring the temperature of a dry bulb, a second platinum resistor for measuring the temperature of a wet bulb and a variable-frequency fan are sequentially connected to the breather pipe behind the heater; a third platinum resistor for measuring the temperature of the dry bulb is arranged on the breather pipe in front of the heater; the first platinum resistor is connected with a first controller, and the first controller is connected with the heater and used for controlling the output power of the heater; the second platinum resistor is connected with a second controller; the first platinum resistor and the third platinum resistor are further connected with a third controller, and the third controller can be connected between the firstplatinum resistor and the third platinum resistor in a switching mode. According to the invention, the temperature and humidity testing precision can be improved.

Description

technical field [0001] The invention relates to an air temperature and humidity testing device and a method for controlling temperature and humidity using the device. Background technique [0002] The wet and dry bulb method is often used to measure the temperature and humidity of the ambient air. The measured dry bulb temperature is the ambient temperature. The wet bulb is wrapped with a special gauze to keep the gauze moist. The moisture in the gauze continuously evaporates and takes away heat. The wet bulb As the temperature decreases, there is a functional relationship between the air humidity and the temperature difference between the dry bulb and the wet bulb. The humidity of the ambient air can be calculated by the temperature of the dry bulb and the wet bulb. [0003] Platinum resistance is a high-precision thermistor. Platinum resistance can accurately measure the temperature values ​​of dry bulb and wet bulb. However, the application of platinum resistance is limit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D27/02G01D21/02
CPCG01D21/02G05D27/02
Inventor 朱建军曾凡勇张海龙毕景豪
Owner CHINA NAT ELECTRIC APP RES INST
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