Hot water supply of residential house-K.P

Contents

1 Initial data

2 Substantiation of WAN system selection

3 Structural elements of the system

3.1 Pipelines and valves

3.2 Heater

3.3 Water metering unit

3.4 Pumps

Content per design part

Contents

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1 Determination of estimated hot water and heat flow rates

2 Hydraulic calculation of supply pipelines of GVA system

3 Determination of heat losses by supply pipelines

4 Determination of water circulation rates

5 Correction of hydraulic calculation of supply pipelines

6 Hydraulic calculation of circulation in hot water supply system

7 Determination of the heater connection to the heating network

8 Calculation of water-water heater according to the mixed diagram of its connection

8.1 Calculation of the lower stage heater

8.2 Calculation of upper stage heater

9 Selection of circulation pumps

10 Selection of water flow meter

11 Determination of the required head at the entry into the building

List of literature

1 Initial data

Building storey -5;

Heated water temperature tr = 65 С;

Cold water temperature tx = 5 С;

1 Substantiation of WAN system selection

The WAN system is designed with lower trunk wiring. Since upper wiring is used when installing battery tanks at the top of the building and if there is a technical floor or attic in the building. The circulation line in this case is laid in the basement. If there is a basement, the absence of storage tanks directly in the building (when the batteries are installed in the CTP or ITR), the lower wiring is more convenient in operation. The GVA system of a multi-storey (5e.) Residential building is designed circulating (in order to ensure the constant temperature of hot water from water discharge cranes).

GVA risers are mounted to the right relative to cold water supply risers.

Horizontal piping from risers to instruments is laid at the floor: cold water pipeline 100 mm above the clean floor, and hot water - 200 mm.

Vertical connections to instruments: hot - on the right, cold - on the left. The following water collection valves are installed in the apartments: in the bathroom - a combined mixer with a rotary outflow; a washing mixer in the kitchen. Towels are provided in the bathroom.

2 Structural elements of the system

2.1 Pipelines and valves

In order to remove air and drain water from the system, pipelines are laid with a slope of 0.002, at the same time the circulation pipeline is located parallel to the supply one. Air is removed from the lower tap systems through the water discharge valves or through the air faucets at the top of the supply risers. Drain branch pipes with shut-off valves are provided for lowering water from the systems in its lower points. Installation of shut-off valves in hot water supply systems is provided: on hot water pipelines near water heaters; at the base of supply and circulation risers: on branches from risers to each apartment; at the entrances to the building.

GVA system pipelines are designed from steel galvanized water and gas pipes according to GOST 326275 * with a diameter of 15 to 50. Check valves are installed on circulation pipeline supplying cold water.

2.2 Heater

Heaters in heat networks have been widely used: in networks with a closed heat supply system - for hot water supply and heating plants, regardless of the water collection system. In water networks, almost exclusively sectional high-speed heaters are used: sectional ones, since they can work under various conditions and especially under various thermal loads, high-speed ones - in order to obtain increased heat transfer coefficients and reduce, thereby the necessary heating surface. When using heaters as per OST 3458868 No. 04. Bv = 69mm; Ft = 0.00108m2; Fm = 0.00233m2; Number of tubes p = 7 pcs. The heated water goes through the tubes, and heats through the annulus. Water heaters are connected depending on the ratio of the maximum hourly heat consumption for hot water supply and the maximum hourly heat consumption for heating.

2.3 Water metering unit

Hot water parameters are monitored by thermometers and pressure gauges. Pressure gauges OSM16961.5 are installed at the outlet of the water heater, before and after the circulation pump. Thermometers PK5 5-2-160-68 are located before and after the water heater and on the circulation pipeline before the pump.

Water flow meters ST50 are used to account for water flow, which are installed in closed heat supply systems on the cold water pipeline before the heater, open - on the hot water pipeline after the mixer.

2.4 Pumps

As circulating and or boosting pumps, a pump of type K8/18b with a nominal supply of 9 m3/h, a full head of 11.4 m, = 53% with a shaft power of 0.6 kW, an electric motor 4A80A2, n = 2900 rpm is used. The number of pumps must not be less than two, one of them is standby. Pumps are installed for circulation only if the head at the water supply is more than required. Pumps are installed in ITR so that there are free passages around them. Household water supply pumps of residential buildings must be equipped with sound-insulating devices consisting of elastic branch pipes on suction and pressure pipelines, and installed on vibration-insulating bases.

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