本文探讨了大气压力、空气温度和空气温差如何影响任何合理的冷却过程。在数据中心中，所给出的方程式适用于风冷服务器和用于从建筑中排出热量的空气处理单元内发生的散热。在本文中，重点将放在空气处理器上，但同样的方程式也适用于服务器。本文的目的仅仅是在一个地方汇集一些相关的方程式、表格和图表，以帮助工程师设计或评估显热排热系统。需要明确的是，本文中给出的方程式仅适用于冷却过程中没有冷凝水分的情况，空气处理器或服务器的运行增量t（t）从20°F（11）变化很小。 1°C）至22°F（12.2°C）导致相应空气处理器或服务器所需冷却气流减少9.1%。大多数城市在一年中都会经历正常的大气压下降，相当于海拔上升500到1000英尺（152.4到304.8米），因此需要冷却空气增加2%到3.5%。引用:德克萨斯州达拉斯ASHRAE Transactions第119卷第1部分。

This paper explores how barometric pressure, air temperature, and air temperature difference affect any sensible cooling process. In data centers, the equations presented apply to the heat rejection that occurs within air-cooled servers and airhandling units used to remove the heat from the building. In this paper the focus will be on the air handlers, however the same equations are applicable to the servers. The purpose of this paper is solely to bring together in one place some relevant equations, tables, and graphs that will assist engineers that are designing or evaluating sensible heat rejection systems. To be clear, the equations presented in this paper are applicable only when there is no moisture condensed in the cooling processA small change in air handler or server operating delta t ( t) from 20°F (11.1°C) to 22°F (12.2°C) results in a reduction of 9.1% in required cooling airflow for the respective air handler or server.Most cities experience normal drops in barometric pressure during the year equivalent to a 500 to 1000 ft (152.4 to 304.8 m) increase in altitude, resulting in the need for cooling air to increase by 2% to 3.5%.