ASHRAE - American Society of Heating@ Refrigerating and Air-Conditioning Engineers@ Inc.
Scope
INTRODUCTION Overview The topics in this field are not easily related to each other since the typical contributors for the topics are often from different sectors of the industry. Specifically@ the following areas will be discussed across the two-part paper: ? The collaborative process: Compensating for a lack of historical data (Part 1) ? Load calculation at the predesign phase (Part 1) ? The impact of space planning with respect to cooling difficulty (Part 2) ? High level presentation of some cooling system choices (Part 2) ? Retrofitting high density loads into existing facilities (Part 2) This second part of the two-part paper will cover three sections that represent the relative impact of the choices that have to be made with regard to the building structure@ cooling system types@ and determining the approach for retrofitting existing facilities with computer equipment that is considered to be a high density load. The first section in this paper will discuss the variables involved with the building plan and section designs. This will include both the considerations at a load planning level and the dimensions that can impact the cooling delivery system and performance. The second section will provide a high level overview of the different types of cooling systems and delivery options that are considered for modem data centers. The final section in this paper attempts to provide a process for determining the path forward when faced with the challenge of having to retrofit a high density load into an existing data center and will discuss how the process changes with aspects such as the size of the deployment and how more radical changes to the data center may prove to be the more complete solution long term as opposed to cooling through brute force by simply adding capacity.