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ISBN-10: 1883413826

ISBN-13: 9781883413828

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Pumps for large, heavy-duty systems have a horizontal split case with a double-suction impeller for easier maintenance and higher efficiency. End suction pumps, either close coupled or flexible connected, may be used for smaller tasks. Pumps can be installed in-line or be base mounted. 3 Very few constant flow systems are designed today because of the increased cost to continuously circulate the design flow and the difficulty in controlling the supply water temperature. Variable flow chilled water systems, serve cooling coils with two-way modulating control valves so that the flow is proportional to the coil load.

A larger total building installed cooling capacity is usually required because the diversity factors used for moving cooling needs do not apply to dedicated packages. • Temperature and humidity control may be less stable especially with mechanical cooling at very low loads. • Standard commercial units are not generally suited for large percentages of outside air or for close humidity control. Custom equipment or special purpose equipment such as packaged units for computer rooms or large custom units may be required.

Advantages of Water-Side Economizers • Reduces compressor energy by precooling entering air. Often the building load can be completely satisfied with an entering condenser water temperature of less than 13°C. Because the wet-bulb temperature is always less than or equal to the dry-bulb temperature, a lower discharge air temperature is often times available. • Building humidification may not be required if return air contains sufficient humidity to satisfy the winter requirement. • No external wall penetration is required for exhaust or outdoor air ducts.

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ASHRAE 2000 HVAC Systems and Equipment Handbook

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