中央冷却装置使用建筑物内整个暖通空调系统消耗的大部分能源。能源经理或顾问可以获得一些有趣的节能机会，尤其是如果建筑物的计算机化能源管理和控制系统（EMCS）包括直接数字控制（DDC）或（EMCS/DDC）。EMCS/DDC可以读取每个冷却盘管控制装置、阀门的准确位置，并根据它们的指示，重置冷冻水供应温度的控制点，该温度正被调节以保持所需的冷却空气供应温度。EMCS/DDC还可以监控冷冻水回路末端的压差（DP），并调整冷冻水泵的流量（速度），使其刚好满足所需的压差，以确保足够的流量通过冷却盘管。 该控制点也可以根据冷却盘管阀的需求进行重置。本文将探讨这些操作模式，并确定预期效益和一些需要避免的陷阱。单位:双引文:研讨会，ASHRAE交易，1985年，第91卷，pt。你好，檀香山2B

A central chiller plant uses most of the energy consumed by the total HVAC system within a building. Some interesting conservation opportunities are available to the energy manager or consultant, especially if the building's computerized energy management and control system (EMCS) includes direct digital control (DDC) or (EMCS/DDC). The EMCS/DDC can read the exact position of each cooling coil control, valve and, according to their dictates, reset the control point of the chilled water supply temperature, which is being modulated to maintain the desired cooling supply air temperature. The EMCS/DDC can also monitor the differential pressure (DP) at the end of the chilled water loop and adjust the chilled water pump flow (speed) to just meet the DP required to ensure adequate flow through the cooling coils. This control point can also be reset according to cooling coil valve demand.This paper will explore these operating modes and identify the expected benefits and some pitfalls to avoid.Units: Dual