Daikin Issues Technical Articles

July 2, 2013
One article discusses how VRV systems using distributed refrigerant technology, can adhere to ASHRAE Standards 15 and 34. Another seeks to clarify performance of geothermal compared to VRV at ASHRAE National HQ.

Daikin has released a technical article discussing how VRV systems, using distributed refrigerant technology, can be designed in adherence to ASHRAE Standards 15 and 34. These standards specify compliant design, construction, installation, and operation of refrigeration systems. Standard 15 was originally developed as a safety standard and recognized in October 1930. According to Daikin, the scope of Standard 15 has been expanded over the years, but the features and technology of a VRV system have not been specifically addressed. ASHRAE Standard 15 is an application based standard, not an equipment design guide, so substantial engineering judgment can be required to follow the standard when designing a system.
“The question of compliance of VRV system designs with Standard 15 is one we get on a regular basis. We felt this article would assist engineers and contractors alike in considerations regarding their system designs, and in their conversations with local code enforcement,” said Lennart Stahl, product marketing engineer. Find the article at

A second technical article recently issued by Daikin is intended to clarify marketing information circulated by other manufacturers, comparing the performance of geothermal water source heat pump systems and air-cooled variable
refrigerant volume heat pump systems installed at the updated ASHRAE National Headquarters in Atlanta, GA.
Several attempts to compare system energy efficiencies have been made public. However, the comparisons have been expressed only in energy consumed, without consideration of the load characteristics (usage, solar load, ventilation, etc.) between the areas served. As a result, Daikin believes the published “efficiency numbers” are of little real value, and the messaging potentially misleading.  Link to this report at bit.ly/DaikinASHRAE.