Hot Water Drawing

Contents

1 Development of hot water supply system

2 Determination of estimated second hot water flow rates

3 Preliminary hydraulic calculation of supply pipelines of the network

hot water supply

4 Determination of heat losses and circulating water flow rates

5 Final hydraulic calculation of supply pipelines

6 Hydraulic calculation of circulation pipelines

7 Determination of hot water and heat hourly flow rates

8 Selection of water heating plant connection scheme

9 Thermal calculation of water heaters

10 Selection of water meters for hot water supply

11 Determination of the required cold water supply head at the TP input

12 Selection of circulation pumps

13 Hot Water Heating Plant Automation System

water supply

1 Development of hot water supply system

In the course project according to the plan of the standard floor, the structural features of the residential building, the planning solutions of the kitchen, bathroom and bathroom rooms, their mutual location are determined. Then the hot water supply system diagram is selected and substantiated.

In accordance with SNiP [1], for this building it is provided to loop the pipelines of water-discharge risers on the surface with bridges and connect them to the common circulation riser.

Ring bridges are laid in a cold attic with insulation.

Hot water supply system (HWS) shall be designed with lower wiring. Pump circulation shall be provided to prevent cooling of water in pipes with little or no water discharge. Breeding networks of GVA systems of residential and public buildings are laid in underground, basements, technical floors and attics with a slope of at least 0.002. The slope of the networks is directed towards the heat point. To descend water from the system at its lower points, downcomers should be installed. At the base of the risers there is a T-joint with a plug.

Air is discharged from the GVA system through an air vent installed in the upper point of the circulation jumper. It is allowed to provide air discharge through water discharge valves located at the upper points of the system. GVA system risers are usually laid in mines, furrows, niches or open on the walls of bathrooms, kitchens and other rooms.

Thermal insulation shall be provided for supply and circulation pipelines of WAN systems

including risers, except for connections to water discharge devices. Thermal insulation may not be provided for architectural reasons for riser piping laid open in heated rooms.

In modern residential buildings made of water fittings in each apartment, as a rule, a bath mixer, washbasin and washing in the kitchen are installed.

The bathrooms should be equipped with permanently heated towels, which are normally connected to hot water systems. In residential buildings with sanitary cabins, towels are usually connected to supply risers, and in buildings without sanitary cabins, towels can be connected to circulation risers.

Installation of shut-off valves in hot water supply systems is provided at the following points:

- on all branches from main pipelines;

- at the bases of supply and circulation risers in buildings with a height of

three floors or more;

- on branches for each apartment.

Fittings with a diameter of up to 50 mm inclusive in hot water supply systems should be used bronze, brass or made of heat-resistant plastics.

To prevent hot water from entering the water supply network and cold water to the hot water supply network, it is mandatory to install check valves in the line: cold water to the water heater, as well as on the circulation pipeline before connecting it to the water heater (after the circulation pump).

GVA system pipelines should be designed metal-polymer, plastic, steel galvanized. Copper and brass are allowed. Piping connections shall be provided on threaded shaped parts or on welding.

Entering heating networks into the building is recommended to be located in the middle of the building. This will make hydraulic linkage of the system branches easier and will ultimately have a positive impact on the hydraulic mode of the system as a whole.

The heat point is located in the basement of the building in the immediate vicinity of the heat network inlet. The room area shall be sufficient to accommodate the equipment (control unit, HW system heaters, circulation pumps) and ensure safe maintenance. Section water heaters in the plan are arranged so that at a height of up to 2 meters between them, protruding structures and pipelines there remains a free passage for maintenance and repair. TP is equipped with thermal energy meters and automation equipment.

13 Automation system of hot water heating plant

• Automation of CTP in closed hot water supply systems shall provide: the specified water temperature in the hot water supply system by installing the temperature controller on the heating water pipeline before the water heater;

• set pressure in the hot water supply system by installation of the pressure regulator "downstream" on the supply pipeline in front of the water heater;

• switching on the standby pump when the operating pump is switched off.

To control circulating and boosting circulating pumps operating periodically, installation of program time relays may be provided.

To maintain the temperature of hot water entering the hot water dilution lines, a number of well-established automatic control devices are used, the principle of most of which is local quantitative control by changing the amount of heating water passing through the heater.

An example of such a device is the description of [5.6] the auto control scheme.

The design should describe the scheme and the principle of its operation, and in the drawings - an image of the scheme on two sections of the heater and the measuring and control device.

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