Sanyo DE operation manual Typical piping diagram-laying NE, General remarks on piping-laying work

ENVIRONMENTALLY FRIENDLY TECHNOLOGY

Typical piping diagram-laying (NE)

Figure 48. Typical piping diagram

Hot water-fired chillers

Main steam piping

Air conditioner

		HC	C
		Chilled water
Chilled water pump	F	pump
		(primary)
(secondary)
		By-pass
		valve
	Supply		Return
	header		heater

Reducing valve

R

P T

P T

P T

P T

To drain ditch

P	Safety valve
		P
	Steam
	shutoff
	valve
	Steam	Bleeder
	control valve	valve
	MV
	Check valve	Bypass
		valve

Tank

about 1m3

To boiler

Cooling water pump

Water supply

Cooling water thermostat

T : Thermometer P : Pressure gauge F : Flow meter : Water pump : Strainer : Valve : Valve

: Thermostat

General remarks on piping-laying work

In order to prevent freezing up of chilled water during diluting operation of chiller, continue the operation of the chilled water pumps and air conditioner until the diluting operation is completed.

Cooling cycle schematic

Figure 49. Hot water-fired chillers

Heat sink 1.7 Heat 1.0

1. Work outside the area surrounded by this line	shall be under-
taken at the expense of the owner.

2.	Refer to the Dimensions diagrams and specification tables for pipe
	connections and diameters.
3.	Standard supply steam press. Is 784 kPa (8 kg/cm2G). A reducing
	valve and safety valve which blows at 981kPa (10 kg/cm2G) should
	be located near the machine as in above diagram if the supply pres
	sure is higher than 784kPa (8 kg/cm2G). A pipe should be extended
	from this safety valve to release excess steam outdoors.
4.	Even if a reducing valve is not required, a strainer, pressure gauge
	and drain trap should be provided for each machine near the steam

9.Provide an air vent valve in each of the chilled and cooling water lines at a point higher than the header for chilled water and cooling water.

10.Lay pipes from the cover of the evaporator and absorber to the drain ditch.

11. Provide a bleeder in the cooling water line for control of water quality.

12.All external water piping with JIS 10k welding flanges are to be

provided by the customer.

13.Be sure to provide a shut-off valve to prevent the steam flow into the

chiller during shut-down.

In case two or more chillers are installed, provide an automatic

shut-off valve.

Cooling Water

�

Generator

�

Evaporator

Hot Water

Condenser

	inlet.
5.	The back pressure in the steam drain line should be limited to less
	than 49Pa (5 mH2O).
6.	Determine the locations of the chilled water pumps and cooling water
	pumps in due consideration of the pump’s hydrostatic head.
	As standard condition, the machine should not be subject to a
	pressure larger than 784kPa (8 kg/cm2G) at any water headers.
7.	Concerning the temperature control of cooling water, refer to the
	section of “control method of cooling water temperature”.
8.	Provide a thermometer and pressure gauge at the outlet and inlet of
	cooling water and chilled water.

14.Be sure to design the location of cooling tower to prevent

contamination of cooling water by exhaust gas from flues.

15.Fix the rupture disk on the chiller according to the manual of rupture

disk, if necessary.

16.The chilled and cooling water pumps should preferably be provided

exclusively for each chillers.

17.Provide expansion tank in the chilled water line.

18.There should be a sufficiently large clearance for easy access to the

evaporator, absorber and condenser, to facilitate inspection and

cleaning work.

�	�
	Absorber
Chilled Water

			�	Heat Exchanger
			Cooling Water
		Refrigeration capacity		0.7
Conc. solution	Dil. solution	Liq. refrigerant	Vap. refrigerant	Cooling water	Chilled water	Hot water

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