手册的这一部分介绍了解决航天器飞行中设备环境控制问题的方法。这个问题的温度方面可以被定义为保持以下热负荷的适当平衡和整合:设备产生的、人员产生的和通过外部边界的传输。 实现这种热能平衡涉及三个特定领域的研究: 1 设计要求的建立。 2 材料性能的评估。 3 分析方法的发展。 作为主要环境控制功能的后半部分的车辆和/或设备增压问题的解决方案也将在本节中讨论。在这种情况下，加压可以被定义为与加压流体的存储和控制、泄漏控制和再加压相关联的任务。尽管压力控制功能次于热能平衡，但它仍然是整个环境问题的一个重要方面。

This part of the manual presents methods for arriving at a solution to the problem of spacecraft inflight equipment environmental control. The temperature aspect of this problem may be defined as the maintenance of a proper balance and integration of the following thermal loads: equipment-generated, personnel-generated, and transmission through external boundary. Achievement of such a thermal energy balance involves the investigation of three specific areas: 1 Establishment of design requirements. 2 Evaluation of properties of materials. 3 Development of analytical approach. The solution to the problem of vehicle and/or equipment pressurization, which is the second half of major environmental control functions, is also treated in this section. Pressurization in this case may be defined as the task associated with the storage and control of a pressurizing fluid, leakage control, and repressurization. Although secondary to the thermal energy balance, the function of pressure control is nevertheless an important aspect of the overall environmental problem.