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40, a combination of one centrifugal and two or more absorption machines can be used as well. It is shown this way for clarity. Figures 40 and 41 show the suggested arrangement. Chilled water returns from the load thru the centrifugal machine, to the absorption machine and then back to the load. The condenser water circuit is piped in parallel to the refrigeration equipment with individual pumps for each circuit. This not only allows the versatility of independent machine operation; it also gives good operating economy.

When the temperature falls, the chilled water controller acts to throttle the variable inlet guide vanes at the centrifugal compressor. If the resulting quantity of exhaust steam from the turbine is insufficient to supply the absorption machine in accordance with its solution control valve position, the steam supply pressure drop and throttles the solution control valve to bring the system into balance. An increase in chilled water temperature causes a reverse action. The low limit chilled water thermostat is a safety device to prevent a freeze-up when more than one absorption machine is required in the design.

Part 7. Refrigeration Equipment | Chapter 4. Combination Absorption-centrifugal System *Back pressure turbine 125 psig inlet, 13 psig exhaust, no moisture †Condensending turbine 125 psig inlet, 4 in. Hg abs. exhaust FIG. 40 – SCHEMATIC OF COMBINATION SYSTEM STEAM PIPING FIG. 39 – GRAPHIC ANALYSIS OF TABLE 11 Although only one centrifugal machine and one absorption machine are shown in Fig. 40, a combination of one centrifugal and two or more absorption machines can be used as well. It is shown this way for clarity.

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