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HEAT PUMPS


Evolution of comfort cooling


The heat pump technology used for comfort cooling has developed signifi cantly over the past two decades. In this article, Martin Passingham, product manager for DX at Daikin UK explores the technological advancements in VRV in particular.


W


hen VRV systems were fi rst launched in 1982, they represented the world’s fi rst complete integrated total system-air-conditioner for


buildings and incorporated the fi rst use of variable refrigerant volume control. Through a series of specialised pressure and temperature sensors, expansion valves and compressor technology, VRV systems were able to accurately assess the amount of heat load in each room. Once this had been established, the system would then deliver the correct amount of total load for the building, which will then lead to the right amount of refrigerant to be provided to each room to achieve the ideal room temperature. Since its launch thirty-fi ve years ago, the technology has continued to evolve to off er further capabilities and higher effi ciencies.


Environmental advancements


As the industry learnt more about the environmental impact of hydrochlorofl uorocarbons (HCFC), refrigerants such as R22 were banned from 1st January 2004. As early as 1997, Daikin responded to the planned phase out and introduced the new R407C refrigerant. This was followed in 1998 by


42 November 2017


R410a, which (by 2010) was seen as the refrigerant of choice in comfort cooling solutions. Now, leading manufacturers are pioneering the use of the most environmentally friendly, energy effi cient refrigerant to date - R32. A future proof solution given the F-Gas phase down, R32 has a Global Warming Potential (GWP) that is 68% less than other common refrigerants. It also off ers higher energy effi ciencies and therefore reduced running costs for customers. Daikin UK is leading the way with its innovative Bluevolution range, which incorporates R32 into its Split and Sky Air units. The latest addition is the new Sky Air A-series, which has been specifi cally designed for use with R32. Incorporating a highly effi cient swing compressor that has been manufactured for use with R32 refrigerant, the Sky Air A-series has patented technology at the heart of its system. The new compressor is designed to cope with the higher discharge temperatures of R32 as well as using this to generate higher effi ciencies. Superior energy effi ciencies of up to A+++ are achieved as well as increased reliability in all weather conditions thanks to the new refrigerant. It is a clear


Continued over page. www.acr-news.com


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