SU1071891A1 - Method of controlling relative humidity in room - Google Patents

Abstract

A METHOD FOR REGULATING RELATIVE MOISTURE OF THE AIR IN THE PREMISES, mainly in the climatic chamber, consisting in that saturated steam and fresh air are supplied to the room and regulate the amount of steam and the thermodynamic parameters of the intake air depending on the parameters of the air in the room, and the thermodynamic parameters of the inlet air change , depending on the relative humidity, characterized in that, in order to increase the efficiency of the air treatment process, the steam supply is regulated depending imosti by placing varying thermal load. And ig. / 00 co

Description

The invention relates to an air-conditioning technique and can be used to control the relative humidity of air in rooms with high and time-varying heat excess, where it is necessary to ensure a relative air humidity close to 100%, mainly in climate chambers.

There is a method of controlling the relative humidity of the air by supplying fresh air and saturated steam to the room, the steam being supplied depending on the relative humidity of the air in room 1.

The disadvantages of the known method include the difficulty of maintaining the specified relative humidity with high accuracy due to the difficulty of precisely controlling the amount of steam admixed to the air.

The closest to the invention is a method of controlling the relative humidity of the air in a room, the conclusion being that the room is supplied to steam and supply air and the amount of steam and thermodynamic parameters are controlled. Depending on the air parameters in the room, moreover, the thermodynamic parameters of the supply air change depending on the relative humidity 2.

However, the known method is characterized by low efficiency of the air treatment process in rooms with increased and variable heat excess.

The purpose of the invention is to increase the efficiency of the air treatment process while regulating the relative humidity.

The goal is achieved in that according to the method, which implies that saturated steam and supply air are supplied to the room and the amount of steam and the thermodynamic parameters of the supply air are controlled depending on the parameters in the room, the thermodynamic parameters of the supply air are changed depending on the relative humidity, The steam supply is controlled depending on the change in the heat load of the room.

FIG. 1 shows a block diagram of a device for implementing the proposed method for controlling the relative humidity of air in a room; in fig. 2 is an I-d diagram illustrating the proposed method.

The block diagram of the device implementing the proposed method comprises conditioned room 1, central air conditioner 2, relative humidity sensor 3, automatic central air conditioner control system 4, steam humidifier installation 5, steam extractor control system 6, and room heat load sensor 7.

The method of controlling the relative humidity of the air is implemented as follows.

Supply air from central air conditioner 2 and steam from steam-humidifying installation 5 are supplied to air-conditioned room 1. Sensor 3 relative humidity through automatic control system 4 of central air conditioner changes the parameters of fresh air, maintaining relative air humidity with necessary accuracy. This accuracy is determined by the characteristics of the relative humidity sensor and the automatic control system. The maximum steam consumption by means of the steam-humidification control system 6 is set according to the maximum thermal load. In order to save steam consumption, the room heat load sensor 7 acts through the steam-humidifying system control system 6 on steam consumption, reducing its consumption with decreasing heat load in the room.

As shown in the pa -d diagram, the angle of inclination of the a-b line coincides with the value of the angular coefficient, i.e., it characterizes the ray of the process in the displacement. The direction of the process beam depends both on the actual heat load of the room and on the quantity and parameters of the steam supplied to the room. The direction of the beam is chosen so that the passage through the point .4, which characterizes the given parameters of the air in the room, is close to the line 100%, but does not cross it. This is achieved in that the maximum steam consumption is chosen taking into account the maximum possible thermal load of the room. Point B characterizes the parameters of the supply air, at which, given the thermal and humid loads of the room, the relative humidity in the room is required.

With a decrease in the heat load of the room and the same steam flow rate, the process beam passes in the direction of the line ab, and the supply air parameters correspond to the parameters at point B. If, proportionally to the load, decrease the steam flow rate, then the process beam again goes in the direction of line a -b

Thus, the steam consumption is measured in accordance with the measurement of the heat load in the room.

The proposed method completely eliminates the need to control the steam flow rate depending on the deviation of the relative humidity from the set one, and the achievement of the required accuracy of controlling the relative humidity is provided by the traditional control system of the central air conditioner.

Claims (1)

METHOD FOR REGULATING THE RELATIVE AIR HUMIDITY IN THE ROOM, mainly in the climatic chamber, which consists in supplying saturated steam and supply air to the room and regulating the amount of steam and the thermodynamic parameters of the supply air depending on the parameters of the air in the room, and the thermodynamic parameters of the supply air change, depending on relative humidity, characterized in that, in order to increase the efficiency of the air treatment process, the steam supply is regulated depending from changes in the heat load of the room.