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Catalogue Absorption

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ENVIRONMENTALLY FRIENDLY TECHNOLOGY

Hot water-fired

building chillers

Typical piping diagram-laying (NE)

Figure 48. Typical piping diagram

Reducing valve

Main steam piping

Modern air conditioner

HX)— Water supply

Chilled water

ra —i—t.

p mary)

Chilled water pump (secondary)

(X—

Cooling water thermostat

-ft-

By-pass valve

Supply headerll

To drain ditch _water _pump

@ : Thermometer (P) : Pressure gauge (f) : Flow meter (^ : Water pump i—^ : Strainer X : Valve M ^: Valve

Thermostat

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 home sink 1.7

Heat 1.0

General remarks on piping-laying work

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

2. Refer to the Dimensions diagrams and specification building 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 981 kPa (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 inlet.

5. The back pressure in the steam drain line should be limited to less than 49Pa (5 mH₂0).

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.

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.

14.Be sure to architectural 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.

Hot Water

Condenser

Cooling Water_—

Generator -

Evaporator.

Absorber

Chilled Water

^ Heat Exchanger

Cooling Water

Refrigeration capacity 0.7

Vap. refrigerant Cooling water Chilled water Hot water

Cone, solution Dil. solution

Liq. refrigerant