Reconstruction project of heating, ventilation and hot water supply system of AKH

Contents

Contents

List of working drawings of the main set

Input data and technical summary

Introduction

Thermal loads and design parameters

Technical solutions

Installation Requirements

Commissioning Conditions

Selection of expansion tank

Selection of drain pump

Explanatory Note

This project of automation of an individual heat station was carried out on the basis of a task issued by the Metallurg campus. Automation is based on the ECL comfort 300 weather compensator manufactured by Danfoss. Weather compensator provides process control, temperature control and control in hot water supply line and heating system. Scope of automation. The project provides for: Management:

solenoid type electric valve for heating system (CO) makeup.

Control of control valves to maintain temperature:

local network water of the WAN system;

local water CO.

Alarm information. Management:

solenoid valve of heating system makeup is performed: in automatic operation mode with the help of DEM 102 pressure switch sensor installed on CO return line; in manual mode, the valve is controlled using the button on the front panel of the control panel.

Temperature control:

Control of local water temperature in the GVA system provides for control of the actuator of the control valve installed on the supply pipeline of the heating network to the heat exchangers of the GVA system of the second stage, according to the signals of the temperature sensor installed on the supply and return pipelines of the local water of the GVA system.

Control of local water temperature in the heating system is provided according to the heating schedule. Temperature sensors are installed on the supply and return pipelines of the local water of the heating system. The outdoor temperature sensor is installed on the wall on the north side outside the building at a height of not less than 2.5 m. Alarm information:

at minimum pressure in the reverse CO line, if the make-up fails to cope with losses in the heating system, then protection is provided by the minimum permissible pressure for pumps, this should be done to avoid idling of the pumps and possible rapid failure;

at minimum water pressure in the return line of the GVA it is also provided to protect the pumps from the minimum allowable pressure at the pump inlet.

In both cases, the pump motors are stopped until the pressure is normal. Light and sound alarms are triggered, for more details, see the section "Electrical equipment."

Input data and technical summary

Object: AKh im K.D. Pamfilova

Subscriber: No. 37/154

Address: Moscow Volokolamskoye Shosse, 116

In accordance with specifications No. 242004 of TSiS Enterprises No. 4 of the power supply contract for consumers of thermal energy in hot water No. 37/154 and the results of the heat consumption systems survey conducted by specialists of the ECOTER PVF, a brief technical characteristic of the subscriber:

Total heat load is: 2,168,808 Gcal/hour

Maximum for heating: 0.919508 Gcal/hour

Maximum per ventilation: 0.673300 Gcal/hour

Maximum for process needs: 0.135000 Gcal/hour

Maximum hourly load on the HVA: 0.441000 Gcal/hour.

5. Design Temperature Plot 13070 ˚S

6. The heating is connected according to an independent scheme,

Ventilation and process requirements - as per dependent diagram, WAN by 2-stage mixed

7. Hydraulic mode:

Pressure in the supply pipeline is 108 m.

Pressure in the return pipeline is 34 m. Water. St.

Static pressure 230 m water, st

Introduction

In this work, the design of a heat station for the reconstruction of the heating, ventilation and hot water supply system of AKH K.D. Pamfilov, at 116 Volokolamskoye Shosse, and is a subscriber of the RTS37 Tushino-3 heating networks of TSiS No. 4 State Unitary Enterprise Mosteploenergo was developed.

The working design of the heat station is based on:

Technical Specifications No. 242004 TSiS Enterprises No. 4

power supply contract for consumers of thermal energy in hot water No. 37/154 and the results of a survey of heat consumption systems conducted by specialists of the ECOTER PVF

SP 4110195 "Design of Thermal Points," Moscow, Ministry of Construction of the Russian Federation, 1997;

SNIP 12032001 "Occupational Safety in Construction," Part 1. General provisions

"Rules for operation of heat-consuming plants and heat networks of consumers and Safety rules for operation of heat-consuming plants and heat networks of consumers."

On the basis of basic data the calculation and selection of the regulator of pressure difference, the regulator of an expense, lamellar water heaters of hot water supply and a heating system, pumps of circulation of a heating system and GVS, fittings and instrument devices and A. Vybran the scheme of heat supply is carried out and the project documentation is made.

Accounting of thermal energy is supposed to be carried out by the WHIST heat meter consisting of: IVB heat calculator; PRN50 expense converters; sensors of temperature KTPTR05 and the counter of make-up water for a heating system with a pulse exit of BCT20 (watch the separate project).

Technical solutions

According to the specifications, the connection is carried out to RTS No. 37 heat networks where the guaranteed head in the supply pipeline is 108 ppm, in the return pipeline 34 ppm. This thermal point is intended for reliable and uninterrupted heat supply of heating, ventilation and hot water supply systems of the AKH while performing the following functions:

heating of water in the heating system in accordance with the heating schedule to the design temperature of 95/70 ° С;

maintaining constant water circulation in the heating system;

makeup of reverse network heating system in automatic mode

heating of tap water for hot water supply system to 60 ° С;

maintaining water circulation in the hot water supply system;

To automate the process, the thermal point adopts an electronic regulator of the type "ECL Comfort 301," which provides control of the coolant temperature in the heating system and in the hot water supply system. Heating system is connected to heat networks via independent circuit through plate water heater. The regulator "ECL Comfort301," receiving information on the outdoor temperature from the temperature sensor ESMT, which is installed on the north facade of the building, maintains a temperature plot of 9570 ° C in the supply line of the heating system. The ECL Comfort301 regulator maintains the heating schedule selected for heating, affecting the control valve VB2 (Dy = 32 mm; Kvs = 16.0 m3/h) with an AMV 20 electric drive from Danfoss, thereby changing the amount of mains water supplied to the heating system water heater. Double circulation pump type UPSD 65180 F (G = 38.3 m3/h; H = 7.4 m.v.) of Grundfos is installed on the return pipeline of the heating system. To balance the flow of the heating system, directly acting Ballorex adjustment (balancing) valves of STAD type are installed on the supply pipeline.

Heating system makeup is carried out automatically from the return pipeline of the heating system through the makeup pipeline on which the solenoid valve (threaded connection) Dn = 20 mm with coil 220 V. The pressure switch installed on the return pipeline of the heating system at pressure P2 = 20 ppm supplies power to the coil of the solenoid valve, thereby opening it, and at pressure P = 25 ppm the solenoid valve closes. To prevent water overflow in the reverse direction, a check valve is installed on the make-up pipeline, and to compensate for volumetric changes in the coolant occurring due to heating or cooling, a membrane expansion tank REFLEX N 800/6 is installed. The hot water supply system is connected to the heat networks via a mixed two-stage circuit with a circulation pump. By pressure, the pump is designed to overcome the resistance in the circulation line and the hot water heater in the 2nd stage. Circulation flow rate is accepted - 25% of the maximum hourly flow rate of hot water. Water preparation is performed in plate heat exchangers of type N35 "APV" of "Heatsink" assembly. The 1st stage uses the thermal energy of water returned from the heating, ventilation and 2nd stage of hot water supply. Water circulation is carried out by low-noise pump of UPS 3260FB type (G = 2.56 m3/h; H = 4.66 m)

Automatic maintenance of the specified temperature of hot water at the outlet of the heat station in the WCS system is provided by the VB 2 flow controller with AMV 30 electric drive of Danfoss company according to the readings of the temperature sensor installed in the hot water pipeline at the outlet of the WCS heat exchanger.

A pit with dimensions of 0.5x0.5x0.8 (h) is made to drain water in the ITP building with natural water diversion to the sewage system.

Note:

calculation (selection) of heat exchangers for the heating system and WAN was carried out according to design loads in accordance with the specification according to the methodology of APV, which is the supplier of this equipment,

calculation (selection) of the circulation pump of the hot water heating and circulation system was carried out according to the design loads according to the methodology of Grundfos, which is the supplier of this equipment.

Installation Requirements

During the work, the requirements of SNiP 480 "Safety in Construction," SNiP 2.04.0786 "Heat Networks," SNiP 3.05.0185 "Internal plumbing systems," requirements of fire and sanitary regulations shall be met. During installation works it is necessary to follow the design and instructions of equipment manufacturers. Tightness of piping connections and serviceability of shut-off and control valves, instruments and instruments shall also be ensured.

Air removal from heat supply systems is performed through R88/1 automatic air sinks. Pipe fixation is carried out on supports made of channel No. 12 and angle 50x50 fixed to the wall. After completion of works pipelines and equipment are washed and tested for tightness. Piping shall be isolated after hydraulic test. Prior to thermal insulation works pipelines, fittings and supports must be thoroughly cleaned of dirt and rust, then anticorrosive painting with organosilicon enamel KO1804 is performed. Pipelines and valves shall be insulated. Thermal insulation is performed by Armaflex synthetic rubber cylinders.

On the insulated surface 6 m later strips with rings, width of strip 300 mm, width of rings on strip 50 mm - with external diameter of insulation up to 200 mm are applied. The paint color of the pipeline indicates the purpose of the pipeline.

After installation works, equipment commissioning works are performed to ensure the required parameters of the coolant supplied from the heat station to the heating and hot water supply systems.

Commissioning Conditions

After completion of works the pipelines and the equipment are washed out and =1.25 Rrab, but not less than 12 kgfs/cm2 are tested with a hydraulic pressure of P. Adjustment works of local systems, heat engineering equipment and debugging of thermal and hydraulic operation modes of automation devices, automatic switching on, off and switching off of pumps are carried out.

Installation Requirements

Installation of equipment and instruments shall be carried out in compliance with safety rules in strict accordance with the design, regulatory and technical documentation and manufacturer's instructions for mounted equipment and equipment.