Pressure increase settings are pumping stationswhich includes from 2 to 4 multistage vertical BOOSTA pumps.
Boosta pumps are installed on a shared frame and interconnected suction and pressure pipelines. Connecting pumps to collectors is performed using shut-off valves and check valves.
The control cabinet is fixed on the rack installed on the frame.
Maintaining constant pressure is provided by regulating the frequency of rotation of the pump to which the frequency converter is connected.
AUPD Flamcomat is used to maintain constant pressure, compensation of temperature extensions, deaeration and coolant loss compensation in closed systems Heating or cooling.
AUPD Flamcomat supports the required pressure in the system in a narrow range (± 0.1 bar) in all operating modes, as well as compensates for thermal extensions of the coolant in heating or cooling systems. In the standard version, the installation of AUPD Flamcomat consists of the following parts:
Water I. air environment The tank is separated by a replaceable membrane from high-quality butyl rubber, which is characterized by very low gas permeability.
Deaeration in AUPD Flamcomat is based on the principle of pressure reduction (throttling). When the pressure coolant is entered into an expansion tank of the installation (non-variable or atmospheric), the ability of gases to dissolve in water decreases. Air is distinguished from the water and is displayed through the aircraft installed in the upper part of the tank. To remove as much air out of water, at the inlet of the coolant in the expansion tank, a special compartment is installed with pall rings: it increases deaeration ability by 2-3 times compared to conventional installations.
Automatic feeding compensates for the loss of the coolant, originating due to leaks and deaeration. The level control system automatically activates the feed function when required, and the heat carrier in accordance with the program enters the tank.
A. Bondarenko
The use of automatic pressure maintenance (AUPD) for heating and cooling systems received wide use Due to the active growth of high-rise construction volumes.
AUPD performs the functions of maintaining constant pressure, compensation of temperature extensions, deaeration of the system and compensation for the loss of the coolant.
But since it is quite new for russian market Equipment, many specialists in this area have questions: What are standard Aoupes, what are the principles of their action and the method of selection?
Let's start with the description of standard installations. Today, the most common type of AUPD is installations with pump-based control unit. A similar system consists of a non-pressure expansion tank and a control unit that is interconnected. The main elements of the control unit are the pumps, solenoid valves, the pressure sensor and the flow meter, and the controller, in turn, ensures the AUPD control as a whole.
The principle of the AWD data is as follows: when heated, the coolant in the system is expanding, which leads to an increase in pressure. Pressure sensor fixes this increase and sends a calibrated signal to the control unit. Control unit (using a weight sensor (filling) constantly fixing the fluid level in the tank) opens the solenoid valve on the cross-line. And through it, the excess coolant flows from the system into the membrane expansion tank, the pressure in which is equal to the atmospheric.
Upon reaching a given pressure value in the system, the solenoid valve closes and overlaps the fluid flow from the system into the expansion tank. When cooled coolant in the system, its volume decreases, and pressure drops. If the pressure drops below the set level, the control unit turns on the pump. The pump operates until the pressure in the system rises to a specified value. Permanent control of the water level in the tank protects the pump from the "dry" stroke, and also protects the tank from overflow. If the pressure in the system goes beyond the maximum or minimum, one of the pumps or solenoid valves is triggered, respectively. If the performance of one pump in the pressure line is missing, the second pump is activated. It is important that the APD of this type has a security system: when one of the pumps or solenoid solenoids, the second must automatically be turned on.
The procedure for the selection of AUPD on the basis of pumps makes sense to consider on the example of practice. One of the recently implemented projects is the "residential building on Mosfilmovskaya" (the object of the company "Don-Stroy"), in the central thermal paragraph. which is applied similar pump installation. The height of the building is 208 m. Its CTP consists of three functional parts corresponding to, respectively, for heating, ventilation and hot water supply. The heating system of the high-rise body is divided into three zones. The total estimated thermal power of the heating system is 4.25 Gcal / h.
We present an example of the selection of AUPD for the 3rd zone of heating.
Initial datarequired for calculation:
1) thermal power system (zone) N. Syst, kW. In our case (for the 3rd heating zone), this parameter is 1740 kW (source data of the project);
2) static height N. st (m) or static pressure R Art (bar) is the height of the fluid pillar between the point of connection of the installation and the highest point of the system (1 M of the liquid column \u003d 0.1 bar). In our case, this parameter is 208 m;
3) the volume of coolant (water) in the system V.l. For the correct selection of AUPD, it is necessary to have data on the volume of the system. If the exact value is unknown, the average value of the water volume can be calculated by the coefficients shown in tab. According to the project Water Volume 3rd Heating Area V. Sist is 24 350 liters.
4) Temperature schedule: 90/70 ° C.
First stage. Calculation of the volume of the expansion tank to AUPD:
1. Calculation of the expansion coefficient TO rashes (%) expressing the increase in the volume of the coolant when he was heated from the initial to average temperaturewhere T. CP \u003d (90 + 70) / 2 \u003d 80 ° C. At this temperature, the expansion coefficient will be 2.89%.
2. Calculation of expansion volume V. Rasha (L), i.e. The volume of the coolant displaced from the system when it is heated to the average temperature:
V. Rasha \u003d. V. Syst. K. rashes / 100 \u003d 24350. 2.89 / 100 \u003d 704 liters.
3. Calculation of the calculated volume of the expansion tank V. B:
V. B \u003d V. rash. TO Zap \u003d 704. 1,3 \u003d 915 liters.
Where TO Zap - stock coefficient.
Next, select the expansion tank size size from the condition that its volume should be no less than the calculated one. If necessary (for example, when there are limitations on dimensions), the AUPD can be supplemented with an additional tank, breaking the total estimated volume in half.
In our case, the volume of the tank will be 1000 liters.
Second phase. Selection of the control unit:
1. Determination of the nominal working pressure:
R SIST \u003d N. System / 10 + 0.5 \u003d 208/10 + 0.5 \u003d 21.3 bar.
2. Depending on the values R SIST I. N. System Select the control unit using special tables or charts represented by suppliers or manufacturers. All models of control blocks can be included as one pump and two. In the AUPD with two pumps in the installation program, you can choose the operation mode of the pumps: "Basic / Standby", "alternate operation of pumps", "parallel operation of pumps".
This is the calculation of the AWD ends, and the project is prescribed the volume of the tank and the marking of the control unit.
In our case, the AUPD for the 3rd zone of heating should include a non-valve tank with a volume of 1000 liters and a control unit that will ensure maintenance of pressure in a system of at least 21.3 bar.
For example, for this project, AUPD MPR-S / 2.7 was chosen into two pumps, RU 25 bar and the MP-G 1000 tank 1000 FLAMCO (Netherlands).
In conclusion, it is worth mentioning that there are also settings based on compressors. But this is a completely different story ...
The article is provided by Adl
Automatic maintenance installation pressure Flamcomat (control with pumps)
Application area
AUPD Flamcomat is used to maintain constant pressure, compensation of temperature extensions, deaeration and compensation for the loss of coolant in closed heating or cooling systems.
* If the system temperature at the installation site exceeds 70 ° C, it is necessary to use the FlexCon VSV intermediate capacity, which provides cooling of the working fluid before installation (see HL. "VSV Intermediate Capacity").
Purpose of installation Flamcomat
Pressure maintenance
AUPD Flamcomat maintains the required pressure in
The system in the narrow range (± 0.1 bar) in all operating modes, and also compensates for thermal expansion
coolant in heating or cooling systems.
In the standard version, Installing Aoupes Flamcomat
Consists of the following parts:
. membrane expansion tank;
. Control block;
. Connecting to Baku.
Water and air medium in the tank are separated by a replaceable membrane of high-quality butyl rubber, which is characterized by very low gas permeability.
Operating principle
When heated, the coolant in the system is expanding, which leads to an increase in pressure. Pressure sensor fixes this increase and sends a calibrated signal to
Control block. The control unit, which is constantly fixed by the fluid level values \u200b\u200bin the tank, opens the solenoid valve on the position of the position through which the excess heat carrier is flowing from the system to the membrane expansion tank (the pressure in which is atmospheric).
Upon reaching a given pressure value in the system, the solenoid valve closes and overlaps the fluid flow from the system into the expansion tank.
When cooled coolant in the system, its volume decreases and pressure drops. If the pressure drops below the set level, the control unit includes
pump. The pump is operating until the pressure in the system is raised to the set level.
Permanent control of the water level in the tank protects the pump from the "dry" stroke, and also protects the tank from overflow.
If the pressure in the system goes beyond the maximum or minimum, then, accordingly, one of the pumps or one of the solenoid valves is triggered.
If there are not enough performance of 1 pump in the pressure line, it will be involved in the 2nd pump (control unit D10, D20, D60 (D30), D80, D100, D130). AUPD Flamcomat with two pumps has a security system: if one of the pumps or solenoids fails, the second is automatically turned on.
To level the time of the pumps and solenoids during installation and increase the installation time of the installation as a whole, in two-axial installations used
Switching system "Worker-standby" between pumps and solenoid valves (daily).
Error signals relating to pressure values, tank fill levels, pump operation and solenoid valve are displayed on the SDS module control panel.
Deaeration
Deaeration in AUPD Flamcomat is based on the principle of pressure reduction (throttling, Fig. 2). When the pressure coolant is entered into an expansion tank of the installation (non-variable or atmospheric), the ability of gases to dissolve in water decreases. Air is distinguished from the water and is excreted through the aircraft installed in the upper part of the tank (Fig. 3). To remove from water as much air as possible, a special compartment is installed at the inlet of the coolant in the expansion tank
Pall rings: it increases deaeration ability 2-3 times compared to conventional installations.
In order to remove as greater gases as possible from the system, an increased number of cycles in the same way as an increased cycle time (both values \u200b\u200bdepend on the size of the tank), are introduced in advance to the installation program at the factory. After 24-40 hours, this turbo deaeration mode goes to normal deaeration mode.
If necessary, you can run or stop the turbo-de-deaeration mode manually (if there is an SDS module 32).
Safety
Automatic feeding compensates for the loss of the coolant, originating due to leaks and deaeration.
The level control system automatically activates the feed function when required, and the coolant in accordance with the program enters the tank (Fig. 4).
When the minimum level of coolant in the tank is achieved (typically \u003d 6%), the solenoid on the feed line opens.
The volume of the coolant in the tank will be increased to the required level (usually \u003d 12%). This will prevent the "dry" work of the pump.
When using a standard flow meter, the amount of water may be limited to the feeding time in the program. When this time is exceeded, it is necessary to take action to eliminate the problem. After that, if the feeding time did not change, the same volume of water can be added to the system.
In the installations where pulse flowmeters are used (optional), the feeding will turn off when the program is reached.
moved water volume. If the feed line
AUPD Flamcomat will be connected directly to the drinking water supply system, you must install a filter and a reverse stream protection (hydraulic cutter - option).
The main elements of the AUPD Flamcomat
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AUPD FLAMCOMAT M0 GB 300
