SU1379577A1 - Method of heat-moisture treatment of air in multizone central conditioning system - Google Patents

Abstract

Invention m. used, dp conditioning of rooms with drastically different parameters of the internal air and allows to reduce energy costs; At the inlet 7 of the air conditioner, using the recirculation unit 8, the outside air and the recirculated air are mixed and the subsequent heat and humidity treatment of the air in the air conditioner as it passes through the cooler 1, the air heater 3 and the steam humidifier 5. At the outlet 10 of the air conditioner, air is distributed through the zone closers 11, 12 and 13 yes its heating up. The required parameters are 1x and then fed separately to each air-conditioned room 17, 18 and 19 with a minimum content, ensuring the subsequent assimilation of supply air from the heat and moisture emissions in the rooms. Regulation of t-ry in rooms is carried out by changing the degree of air preheating and changing the mode of heat and humidity treatment of air depending on the minimum t-ry of indoor indoor air. 2 Il. (L

Description

00

with

ate

The invention relates to central multi-zone air-conditioning systems for air with sharply different parameters.

internal air.

The aim of the invention is to reduce energy costs.

Figure 1 is a schematic diagram of the device for implementing the method; in fig. 2 - modes of heat and air treatment of air in the air conditioner in the I-d diagram.

A device for implementing the method of heat and air treatment of air in a central multi-zone air-conditioning system contains an air conditioner as part of chiller 1 of the refrigeration unit (not shown) with compressor 2, air heater 3 with unit 4 for controlling the flow rate of heat-transfer fluid, steam humidifier 5 with electric heater 6 and located at the inlet 7 air conditioner node 8 recirculated soup with actuator U.

Output 1Q air conditioner is connected in parallel with zone closers 11-13 with motorized control valves 14-16.

In each air-conditioned room 17-1U, temperature sensors 20-22 are associated, respectively, with temperature regulators 23-25, and humidity sensors 26- 28 associated with the controller; -M 29-3 relative humidity

Kpoi-ie, temperature sensors 20–22 and relative humidity 26–28 are connected via analyzer 32 based on logic comparators and logic switch 33 to the corresponding control inputs (not shown) of the actuator 9 , compressor 2, unit 4 for controlling the flow rate of heat-transfer fluid and electric heater 6.

A device for implementing the method works as follows.

When the conditioning system is started up, the zone (room) with a minimum temperature of internal air is determined, after which the control of the process nI of the heat and humidity treatment of the air is switched to the temperature and relative humidity controllers of the given zone.

At the inlet 7 of the air conditioner, using the recirculation unit 8, the external and recirculated air is displaced if necessary, and the subsequent corresponding heat and moisture treatment of the air in the air conditioner during passage through cooler I, air heater 3 and steam humidifier 5 in one of the treatment modes I-VII.

At the outlet 10 of the air conditioner, the air is distributed through the zone closers 11-13 for heating it to the required parameters and then supplied separately to each air-conditioned room 17-1U with minimal moisture content, which ensures the latest assimilation of heat and moisture in the air into the fresh air x 17 - 19.

In the abbreviated form of recording the control program of the device to revise the air treatment method, the following indices are used: H — outside air; P - fresh air; p is the state of air determined by the coefficient of sanitary standard;

B is the state of air in the serviced area (the room serviced);

PV - the load (process) of the room K - the point of maximum cooling (drying), (not shown in Fig. 2); - direct, determining the direction of the process of maximally deep cooling (drying);

M - maximum recirculation (the system operates at the minimum flow rate of outside air allowed by the sanitary standard) of the processes of heat and humidity air treatment; p is recycle; T - heating; And - moisturizing; X - cooling.

Figure 2 on the I-d diagram shows the modes of heat-humidity treatment of air in an air conditioner with conditional numbering of processing modes from I to VII.

Processing mode I. If the point H, which characterizes the parameters of the outside air is B this area (Fig.2).

t

tpi d ;. dp; i: -I ,.

P p –and p TO the position of the regulators and their control from the respective temperature and relative humidity sensors are as follows: the recirculation valve of the recirculation unit 8 is open;

The capacity of the heater 3 is controlled by a corresponding temperature sensor installed in the conditioned room, the moisture output of the humidifier 5 is controlled by a corresponding relative humidity sensor.

In processing mode I, the control algorithm has the form AND (.,.

When the temperature t increases, the node 4 for controlling the heater 3 also closes when

 n - p

the control unit 4 is completely closed, which is a signal for the transition of point H to the area located in the zone of point B (Fig. 2), and to processing mode II.

The tg control is transmitted from T to P. Processing Mode II.

tp-t-H n d,

P6

in processing mode II, the PtgHt jj control algorithm.

A corresponding temperature sensor controls the recirculation valve of the recirculation unit 8. A corresponding relative humidity sensor is controlled by a humidifier 5.

With an increase in temperature t, the recirculation valve is covered and

 t.

it closes completely.

and f

is a signal to go to processing mode IV. The control tg is transferred to cooler I.

When t decreases, the recirculation valve opens and at t tp the recirculation valve is fully open. This is a signal for transition to processing mode I. The control tg is transmitted to heater 3.

When the moisture content is kept in a controlled room, the corresponding qig relative humidity sensor reduces the amount of water evaporated from humidifier 5 and when d is reached, humidifier 5 is turned off. The control Cp is transferred to the recirculation valve P of assembly 8

recirculation, which turns on the heater 3, which is controlled by the appropriate temperature sensor. This is a signal for transition to processing mode III, whose control algorithm is Processing Mode III.

fe

ten

Tj

ip dn "d d; tj, t. The control algorithm is Rc,,

five

about

Q

s

.

As d increases, a corresponding relative humidity sensor closes the valve of the recirculation unit 8, reducing the amount of recirculation and increasing the amount of outside air.

With dj, d, the recirculation valve P of the recirculation unit 8 is closed, and the outside air valve of the recirculation unit 8 is open, the humidifier 6 is turned off, the heater 3 is controlled by a corresponding temperature sensor. This is a transition to treatment mode IV, and the chiller is turned on 1 tuned to d.

When the moisture content d decreases within the area B of the processing mode III (Fig. 2), the proportion of the circulating air increases to maintain the regime in the location zone of point B; The recirculation valve P of the recirculation unit 8 is opened and, at d dp, the recirculation valve P is fully open.

If, in this case, the humidity is cf less than the specified value of tf g, then the humidifier 5 is turned on, which is the transition to the processing mode I.

As d decreases, point H moves to the left in the I-d diagram. If point H is above the tp isotherm

  tp,

This reduces heating T using the air heater 3 (the mixture point approaches point P) and with d-H Кпв heating T is turned off.

Turning off the heating T with regulated recirculation Rc is a transition signal and processing mode II, in which the control tg is passed to recirculation P and the humidifier 5 is turned on, controlled by an appropriate relative humidity sensor.

Processing Mode IV.

Recirculation valve P of recirculation unit 8 is closed, cooler I is controlled by an appropriate relative humidity sensor.

The air is cooled so as to ensure the ratio d d, and then it is heated in the heater 3 controlled by an appropriate temperature sensor.

The control algorithm is

tfe

Increasing t n or 1 "increases the flow of cold to maintain d", while the heat consumption remains

one

t

t g sensor na15

When the apagosuid content d increases within area 5 (fig. 2), moisture consumption for humidification is reduced.

With

1i

dn humidifier 5 is turned off, which is a signal for switching to treatment mode IV. Management of the undiminished. With

The open air t ,, tuned to a predetermined air temperature in the room gives a corresponding signal to open the recirculation valve P of the recirculation unit 8, which is carried out in order to save energy, and requires 20 external humidity switches

on the cooler 1, and the air temperature in the room tg on the heater 3. Processing mode VI. Within this region, the recirculation valve P of the recirculation unit 8 is fully open (RD,). Chiller 1 is controlled by an appropriate temperature sensor. The humidifier 5 is controlled by an appropriate relative humidity sensor.

To the right of dn (Fig. 2), maximum recirculation makes it impossible to maintain after shifting with the control algorithm P

In the event of dc, the solution is reduced for cooling.

Opening to the maximum degree of the recirculation valve P of the recirculation unit 8 in the control algorithm Xc,, T is a transition signal to the processing mode T1III VII, the control algorithm of which is

m; h-to te

If the outdoor air moisture content decreases in processing mode IV (FIG. 2) and d d is reached, it is necessary to disconnect cooler I from control of the corresponding relative humidity sensor tfg. In case when shutting down cooler 1, heating air T in heater 3 is necessary to maintain the set temperature tg, then this is a signal to go to processing mode III (point H,).

The control cp is transferred to the recirculation valve P of the recirculation unit 8. The control algorithm is Ru,. In the event that when cooling off 1diter I, the temperature in the room of the dziopiruemy room tg rises, then this is a signal to go to the processing mode V, the control algorithm of which is

i: B tPe

Processing Mode V.

25

thirty

.

35

40

45

Moisture stroke and when dn dp, lvAstener 5 is turned off.

When d dp, dg th ", H c.

The corresponding relative humidity sensor switches to chiller I control.

The heater 3 is turned on. controlled by tg, which is a signal for transition to processing mode VII.

Processing Mode VII.

tw t,

d,

50

 n B1 -and P control algorithm is

Recirculation valve P of recirculation unit 8 is open (not controlled); chiller 1 is controlled by heater 3 is controlled by an appropriate temperature sensor.

t,

    n

dn dn.

The control algorithm is

V.I.R.

When the air pressure reaches tg and t 5 reaches, the corresponding outdoor temperature sensor switches on the icaaiian recirculation P of the recirculating unit 8 to the full degree of opening

That is the signal for switching to the VI treatment mode in the air conditioner.

Decreasing t to t reduces the required cold consumption to maintain tgHa at a given level and

H

t appropriate temperature sensor

Shut off the chiller 1 and switch to the recirculation valve P of the recirculation unit 8, which is a transition to processing mode II.

When the apagosuid content d increases within area 5 (fig. 2), moisture consumption for humidification is reduced.

relative humidity switches

With

1i

dn damper humidifier 5 switches

What is the signal to go to processing mode IV. Relative Humidity Control Switches

flax yield and

ts ras Ir

When dts are reduced,

Moisture stroke and when dn dp, lvAstener 5 is turned off.

When d dp, dg th ", H c.

The corresponding relative humidity sensor switches to chiller I control.

The heater 3 is turned on. controlled by tg, which is a signal for transition to processing mode VII.

Processing Mode VII.

tw t,

d,

0

 n B1 -and P control algorithm is

Recirculation valve P of recirculation unit 8 is open (not controlled); chiller 1 is controlled by heater 3 is controlled by an appropriate temperature sensor.

By lowering d to d

R

when

dp dn, it becomes impossible to provide data processing mode

(for fixed) the value of tf in H in -R in

set that causes the need to turn on the humidifier 5, turn off the heater 3 and serves as a signal to switch to the processing mode VI.

Claims (1)

Invention Formula The method of heat and humidity treatment of air in a central multi-zone air conditioning system for rooms with drastically different indoor air parameters, mixing the external and recirculated air, the subsequent heat and air treatment of the air conditioner, air distribution through the zone closers to heat it to the required parameters, air supply separately to each of the conditioned rooms with minimum moisture content, ensuring subsequent assimilation by supply air heat and moisture in the rooms, and temperature control in the conditioned rooms by changing the degree of air preheating, characterized in that, in order to reduce energy costs, the temperature in the air-conditioned rooms is additionally controlled by changing the heat and humidity conditions air treatment depending on the minimum internal air temperature of the air-conditioned premises. HP l L "x,., TC y g d .Z