CS269380B1 - Temperature and humidity detection equipment in frost - Google Patents

Abstract

The solution falls into the field of psychrometric air humidity measurement. The device solves the problem of reliable use of psychrometric air humidity measurement at temperatures of 0 °C and below. The essence of the solution lies in the fact that an air heater is included in the inlet air channel, in front of which a first dry thermometer is arranged, and behind the air heater a second dry thermometer is arranged, stored in the psychrometer together with a wet thermometer.

Description

The present invention relates to a device for detecting the temperature and humidity of air at frost and solves the problem of reliable use of psychrometric measurement of air humidity at temperatures of 0 ° C and lower.

Meters based on the psychrometric principle cannot yet be used to detect air humidity at temperatures of 0 ° C and below. The use of psychrometers is common for measuring humidity for temperatures above 0 ° C and is preferably used for accurate measurements and for determining humidity for microclimate control purposes. Preferably, the psychrometric principle is used in conjunction with microcomputer controllers, which guarantee the immediate calculation of the relative humidity of the air from two measured quantities - the dry bulb temperature and the wet bulb temperature. At temperatures below 0 ° C, the water on the humidified thermometer freezes and measurement is impossible. The use of non-psychrometric methods for sub-freezing temperatures does not give sufficiently accurate results.

The freezing air humidity measuring device according to the invention eliminates this disadvantage. Its essence lies in the fact that an air heater is included in the inlet air duct, in front of which a first dry thermometer is arranged, behind the air heater a second dry thermometer is arranged, placed in psychrometers with a humidified thermometer.

The device for determining the temperature and humidity of frost according to the invention allows the use of the psychrometric principle of measuring air humidity at temperatures below 0 ° C. This is necessary, for example, when regulating the microclimate in buildings with biological material, eg in buildings for livestock breeding, warehouses for agricultural products, etc., when it is necessary to know the parameters of the outside air for the control algorithm. The use of a device for measuring air humidity on a psychrometric principle guarantees the accuracy and operational reliability of the measurement and the resulting optimal course of ventilation or air conditioning in drying, storage, production and other buildings so that the required parameters are achieved as soon as possible or so that these parameters are problem-free. and precisely maintained, with minimal energy consumption for ventilation, drying or air conditioning. It thus guarantees not only energy savings, but also a quality product, depending on the stated parameters or achieving and maintaining an optimal microclimate in the building.

An exemplary embodiment of the device according to the invention is schematically shown in the drawing.

The inlet air duct χ is provided with a first dry thermometer 2 »which, like the thermometers J, 8 described below, is preferably formed by a thermistor or other electric thermometer cell, provided with terminals J connected, for example, to a control computer (not shown). The inlet air duct opens into an air heater 4, which is connected to the psychrometer 6 by a connecting duct 5. A second dry thermometer 2 and a humid thermometer 8 are located therein. The psychrometer is provided with an outlet fan 9, to which the outlet duct 10 connects.

The device according to the invention works as follows: air from the ambient atmosphere is sucked in by the inlet air duct 2 by the action of the outlet fan 2, its temperature being measured by the first dry thermometer 2. It further enters the air heater 6, in which it is heated to a sufficiently high temperature, so that the temperature of the humidified thermometer 8 is sufficiently above the freezing point and the humidifying medium on the humidified thermometer 8 does not freeze.

CS 269 380 Bl

The intensity of heating of the measured air in the heater 4 is preferably regulated on the basis of the temperature of the humidified thermometer 8. From the heater 6 the heated air enters through the connecting channel 2 to the psychrometer 6, where the second dry thermometer 7 air through the outlet duct 10 back to the atmosphere.

Based on the determined values of the first dry bulb thermometer 2, the second dry bulb thermometer 2 and the humidified thermometer 8, the relative and absolute humidity of the ambient air can be determined and the values thus obtained can be used for in order to evaluate and, if necessary, control by means of elements or devices (not shown). The purpose is to determine the relative or absolute humidity of the surrounding air, or as well as maintaining an optimal environment in a building with a controlled microclimate or optimal parameters of stored or otherwise processed material.

Claims (1)

OBJECT OF THE INVENTION Device for determining the temperature and humidity of air at frost, equipped with a dry thermometer and a humidified thermometer in an air duct with a connected fan, characterized in that an air heater (4) is arranged in the inlet air duct (1), in front of which a first dry thermometer is arranged (2) and behind the air heater (4) a second dry thermometer (7) is then arranged, placed in the psychrometer (6) together with the humidified thermometer (8).