ENVIRONMENTALLY FRIENDLY TECHNOLOGY
Typical piping diagram-laying (NE)
Figure 48. Typical piping diagram
Hot water-fired chillers
Main steam piping
Air conditioner
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| Chilled water | |
Chilled water pump | F | pump |
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(secondary) |
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| valve |
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| Supply |
| Return |
| header |
| heater |
Reducing valve
R
P T
P T
P T
P T
To drain ditch
P | Safety valve |
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| P | |
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| Steam |
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| shutoff |
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| valve |
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| Steam | Bleeder |
| control valve | valve |
| MV |
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| Check valve | Bypass |
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| 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
1. Work outside the area surrounded by this line |
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taken at the expense of the owner. |
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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 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.
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.
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
In case two or more chillers are installed, provide an automatic
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.
Cooling cycle schematic
Figure 49. Hot
Heat sink 1.7 | Heat 1.0 |
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Hot Water
Condenser
Cooling Water
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Generator
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Evaporator
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Absorber | ||
Chilled Water | ||
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| � | Heat Exchanger |
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| Cooling Water |
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| Refrigeration capacity | 0.7 |
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Conc. solution | Dil. solution | Liq. refrigerant | Vap. refrigerant | Cooling water | Chilled water | Hot water |
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62 | 63 |
