Fujitsu S26361-F2735-L130 User Manual

⏐ Issue: March 25, 2008 ⏐ Product: PRIMERGY rack systems Design guide 

 
In principle, specific responsibilities must be observed in integrating components to create an overall system. They include 
compliance with country-specific and international regulations and provisions, such as electrical and electromagnetic behavior, 
safety regulations and operating conditions. The party integrating components from different vendors therefore bears 
responsibility, and is consequently liable for and warrants the integration work that has been carried out. 
 

 
A broad range of servers means a large variety of combinations in the rack and the requirement that every server be operated 
within its thermal limits. To avoid every possible configuration having to be assessed separately, rules for installing servers and 
components in the racks have been established: 
 
1.  Every server is independent in its height unit(s) and respects the independence of neighboring servers. 
 
2.  Every server must be able to function with the resources of its height unit(s) (cooling, cable management, maintenance 

space, etc.). 

 
These two rules restrict the creativity of developers of servers and rack-mounted systems to the height unit(s) required by the 
server, yet permit different solutions to coexist.  
 
A thermal assessment of a server in the rack must take into account the following PRIMERGY servers cooling concept: 

  

 

The following thermal conditions must be taken into account: 
 
• 

A PRIMERGY server is cooled by an air current that is generated by fans within the server. Any emission of thermal energy 
is regarded as negligible and consequently does not contribute to cooling the server. In the same way, any possible supply 
of energy from thermal radiation is regarded as negligible and is ruled out.  

 
• 

The front 19” plane is defined as a climatic boundary between the intake air and exhaust air of the rack or the server. 

 
Therefore the following applies: 

 

1.  Following mounting of the server in a rack, the intake air area is defined as being the boundaries of the height units it 

occupies. 

 
2.  The floor and cover surfaces of the server are defined as adiabatic surfaces, i.e. thermal energy is not exchanged via the 

floor or ground surface. This prevents any influence from servers mounted above or below. 

 
In cabling the server, the rack infrastructure is used optimally and the exhaust air area of the server is kept free to the maximum 
possible extent.