Danfoss DSE-I1B Data sheet

Data sheet

Welded District Heating Stations

Type DSE-I1B (two secondary heating circuits)

General description and application

District heating transfer stations provide the link between district heating suppliers

and customers’ systems.

They incorporate the necessary equipment to tailor the supplied heat to the needs of the object premises as specified in the heating supply contract.

In this they need to comply with all applicable standards and with the supplier’s technical connection conditions.

Indirect connections (in which district heating and in-house systems are hydraulically isolated) incorporate components to separate the systems (heat exchanger), to limit the flow volume to that specified in the contract, regulate the secondary supply temperature and measure the energy consumption.

The system described here is a standard type in which the secondary incorporates two regulatory / heating circuits.

	Maximum operating
		Primary
	parameters
		Maximum permissible supply temperature, primary	TVP	150 °C
		Maximum permissible operating pressure, primary	PZP	25 or 16 bar (g)
		Rated pressure, primary	PN	25 or 16
		Maximum permissible pressure differential, primary	DPP	20 bar (-kvs=8 m3/h) / 16 bar (kvs=12.5-20 m3/h)
		Maximum permissible flow volume, primary	VZP	9.0 m3/h for w <= 1.2 m/s
		Secondary
		Maximum permissible supply temperature, secondary	TVS	110 °C
		Maximum permissible operating pressure, secondary	PZS	10 bar or depending on the safety valve
		Rated pressure, secondary	PN	10
		Maximum permissible flow volume, secondary	VZS	25.0 m3/h for w <= 1.2 m/s

Circuit diagram						0211		0212
					0521	0411	0522	0412
						0421		0422
					0531	0450	0532	0450
						0451		0451
					0251		0252
					0111	0231	0112	0232
							0122
					0121		0132
0430 0400	0020			0520	0131
0431 0401				0530
	0021					1211		1212
0220
			0010
0200			0011	0560	0100
0430 0400	0033	0510	0012	0561
0431 0401		0511
	0030			MAG
0040	0430			0440
	0431			0441
		0270		0280

Options

Instead of the 0020/0030 the system can also incorporate a combined flow/temperature regulator (combo-valve), which can be installed in the supply or return line as desired.

Legend

0200/21x	Shut-off device for primary/secondary
121x	Shut-off device for secondary distributor
0430/431	Manometer with shut-off valve
0400/401	Thermometer with immersion sleeve
0220/23x	Dirt trap / strainer
0040	Fitting piece for energy meter
0020	Motor regulator valve
0021	Electrical actuator
0030	Pressure differential and flow regulator
0033	Needle valve
0270	High-pressure drain valve
0510/511	Return temperature limiter
0010-12	Heat exchanger with insulation
0560/561	Safety thermostat
052x/53x	Supply temperature sensor
0100	Safety valve
0280	Drain valve
044x/045x	Manometer with shut-off valve
MAG	Pressure retention connector
041x/42x	Thermometer with immersion sleeve
011x	Circulation pump
025x	Non-return valve
012x/013x	Mixing valve with electrical actuator

DEN-SMT/PL

VD.HE.E2.02 © Danfoss 05/2012

1

Data sheet	Welded District Heating Stations	Type DSE-I1B (two secondary heating circuits)
Materials
	Pipes and pipe fittings, flanges	P235GH-TC1, C22.8
	Heat exchanger	1.4404 with Cu brazing compound
	Fittings	CuSn5Pb5Zn5-C (RG-5), ST37.0,
		EN-GJS-400-18-LT (GGG40.3)

Function	Hot water drawn from the pipeline of the local or
	district heating supply company is fed into the
	station at an appropriate temperature and pressure,
	which may be higher in winter than in summer.
	In the primary supply line this hot water will
	generally flow through a shut-off valve and
	a dirt trap / strainer.
	Depending on the system design and the
	stipulations of the heating provider, both the
	supply and return lines will normally incorporate
	a thermometer and a manometer to register the
	temperature and pressure.
	There will also be regulatory equipment in the
	supply or return lines of the primary as specified
	by the requirements and the circuit design.

The cooled heating water then flows back to the local or district heating supply company via the primary return pipe.

A pump in the secondary circuit of the in-house system then circulates the hot water to the heating surfaces or other consumers (e.g. ventilators, domestic hot-water systems, etc.).

Additional heating circuits incorporate valves to regulate the secondary temperatures to suit the specific parameters of the heating circuit.

Technical data
		Primary			Secondary (largest heating circuit)
	DN		max. Vp	DN max.	max. Vp	Pump	Mixer valve	Residual delivery head
			[m3/h]		[m3/h]	MAGNA(*)	kvs [m3/h]	[kPa]
	20		1.8	40	6,0	32-120	16.0	55
	25		2.5	50	9,0	40-120	25.0	50
	32		3.5	50	10,0	50-120	40.0	65
	40		5.7	65	15,0	50-120	40.0	55
	50		7.3	80	20,0	65-120	63.0	50
	65		9.0	80	25,0	65-120	63.0	30
	Primary control valve (20/30) / EM (40)
					Dimen­
	DN		kvs	QN	sions
			[m3/h]		G [‘’] * L
					[mm]
	20		.. 4.0	.. 2.5	1 x 190
	25		6.3	3.5	5/4 x 260
	32		8.0	3.5	5/4 x 260
	40		12.5	6	5/4 x 260
	50		16.0	10	2 x 300
	65		20.0	10	2 x 300

Types:
0020/21	VM2/AMV10/13/20/23	(*) other pumps on request
0030	AVPQ or AVPB	0121/31 VRG/AMV435 or VF3/AMV55
0020/21	AVQM/AMV10/13/20/23(SL)
(alternative)

2	VD.HE.E2.02 © Danfoss 05/2012

DEN-SMT/PL