SU821848A1 - Method of heat-and-moisture treating of air - Google Patents

Description

(54) METHOD OF HEAT TREATMENT OF AIR AIR PROCESSING

      . ; Design relates to air conditioning technology. There is a method of heat and air treatment in the cold period of the year by heating the outside air flow to a constant positive temperature in the first heating section, then mixing it with the recirculated air flow and isenthalphal cooling and removing this mixture in a contact heat and mass transfer apparatus l. The disadvantage of this method is the increased heat consumption for air treatment, when, when you see the flow of outside air without heating, with the maximum possible sanitary pressure, the flow of recirculated air from the mixture condenses out; In this case, the flow of outside air is heated in the first heating section to a positive temperature, and the amount of recirculated air is reduced. The purpose of the invention is to reduce heat consumption for air treatment. The goal is achieved by introducing additional air into the outside air flow before mixing it with the recirculation flow, and heating is carried out to a temperature that ensures the temperature of the mixture of the total outside air flow and recirculation air at least not below the dew point this mixture. FIG. Figure 1 shows one of the possible schemes for installing an air conditioning unit for carrying out the proposed method of heat and air humidity treatment; 2, the air treatment process in the O-d diagram. The installation contains a channel 1 for collecting the total amount of outside air during the winter period, an additional channel 2 for taking the outside air during the summer period with valves 3, 4 and 5 (during operation of the installation according to the proposed method, channel 2 does not work and valve 5 is closed), channel b supplying recirculated air with a valve 7, mixing chamber 8, contact heat and mass transfer apparatus 9 with a circulating ring 10, selection 11 of the second heating (it may not be), fan 12. In channel 1 of the intake of total amount of outside air is installed pereg odka 13 cases into two conductive dopolnitelnOs channel 14 and 15, which are respectively arranged flaps 3 Example 4. In a further passage 14 is placed the first heating section 16 with supply and return piping 17 and the wires 1B trehhodovnm with regulating valve 19 ,. Temperature sensors 20, 21, 22 and 23 are installed in the additional channels 14 and 15, as well as in the return pipe 18 and in the mixing chamber 8. The sensor 23 can be placed behind the contact heat and mass sorption apparatus 9 (shown by dotted line this is sensor 24). The temperature sensor 20 is set to a constant positive temperature characterized by a point K in the J-d diagram (Fig. 2). The sensor is set to the temperature of the wet thermometer, which is determined in the D-ci diagram by the point O (figure 2). The sensor 21 detects the temperature of the outside air (point H figure 2). The sensor 22 is set to the minimum coolant temperature in the return line 18, which is established on the condition that the coolant does not freeze in section 16 of the first heating.

The installation works as follows.

The total flow of external air is taken in by the fan 12 through channel 1, divided into two streams, one of which - the main one - passes through additional channel 14 and is heated in it to a constant positive temperature K (Fig. 2), which is maintained by sensor 20, affecting the three-way valve 19, while the sensor 22 ensures that the temperature of the heat transfer medium is maintained in the return pipe 1B from the condition that the heating section does not freeze. Another additional stream of external air passes through the channel 15 and is introduced into the main stream before mixing the external air with the recirculated air stream in the mixing chamber 8. The mixture of isotoent fluxes is cooled and humidified in the heat and mass transfer apparatus 9. The temperature sensor 23 measures the temperature of the formed the mixture, which should not be below the dew point of the mixture, and acts on valves 3 and 4, changing the ratio of the amount of air passing through channels 14 and 15. At the same time, valve 5 is closed and valve 7 is open. After the valve 3 is completely closed and the valve 4 is fully opened, the outside air temperature is still negative and the temperature sensor 22 provides the minimum flow of coolant through the first preheating section 16 to prevent freezing. However, with appropriate constructive installation, for example, a device of an independent duct 14, with thermal insulation, etc., it is possible to turn off the section when closing valve 3

16 of the first heating from the heat supply network using the valve 19. With further increase in temperature (but it is still negative), the temperature of the mixture sensor 23 supports the joint operation of valves 7 and 5.

when the outside air temperature is higher to a positive value (for example + 3-5 s), the impulse sensor 21 is turned off by the automatic heating control system

air in section 16 of the preheating, while the temperature of the mixture sensor 23 maintains by varying the ratio of the amounts of recirculated air and the outside, respectively, with valves 7 and 5. When the unit is operating according to the proposed method, heat is achieved by reducing the air parameters that the outside air is heated to . Reducing the number of hours of operation that are required to heat the outside air.

Claims (1)

Invention Formula The method of heat and moisture treatment. air in the cold season by heating the outside air flow to a constant positive temperature in the first heating section, then mixing it with a stream of recirculated air and isenthalpic cooling; the humidification of this mixture in a contact and mass heat exchange apparatus, which is due to the fact that reducing the heat consumption for air treatment / air flow before the air is displaced with the recirculation flow, additional air flow is introduced, and the heating is carried out to a temperature that ensures the temperature of the mixture of the total external air flow and recirculation air dew point of this mixture. 5 Sources of information. accepted attention in the examination 1. Nesterenko A.V. Basics of thermodynamic calculations of ventilation and air conditioning. M., 0 Higher School, 1971, p. 209-211.