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1 Feb 2007

Masterclass:Plate Heat Exchangers-Part 14

In the last article we studied fin and tube evaporators. A study of the increasingly popular brazed plate heat exchanger (BPHE) as an evaporator now follows. It is interesting to note that BPHEs are also extensively applied as condensers in order to ...

1 Jan 2007

Expansion Devices / Evaporators - Part 13

In this month’s article we complete our review of expansion devices and commence a study of air to refrigerant and water to refrigerant evaporators....

1 Dec 2006

Masterclass:Expansion Devices - Part 12

In the last article we completed our review of thermostatic expansion valves. The following continues our study of expansion devices and distributors....

1 Nov 2006

Masterclass:Externally Equalised Thermostatic Expansion Valves - Part 11

In part 10, capillary tubes, restrictor expansion devices and the thermostatic expansion valve (TEV) were studied. In this month’s article we continue our study of the range of expansion devices available....

1 Oct 2006

Masterclass: Expansion Devices - Part 10

IN PART 8 and 9, the methods of heat rejection utilising air cooled and water cooled condensers were studied including the fundamentals of cooling towers....

1 Sep 2006

Masterclass: Condensers - Part 9

This month we continue our study of air-cooled condensers, looking at various forms of control, materials, unit selection, system design and energy conservation....

1 Aug 2006

Masterclass: Condensers - Part 8

Over the last three months we have studied various compressor types. Following compression, the high-pressure refrigerant vapour is passed to the condenser where the latent heat of condensation is rejected thus returning the refrigerant to liquid ...

1 Jul 2006

Masterclass:Compressors - Part 7

In parts 5 and 6 we studied reciprocating and scroll compressors. Rotary vane, screw and centrifugal compressors are covered here in part 7....

1 Jun 2006

Masterclass: Compressors - Part 6

This month we continue our study of compressors and the alternatives to the reciprocating compressor....

1 May 2006

Masterclass: Compressors - Part 5

In the last article we looked at refrigeration cycles. We shall now move on to the key components of the vapour compression cycle starting with the heart of the system – the compressor. Refrigerant vapour compressors fall into five principal types:1....

1 Apr 2006

Masterclass: Refrigeration Cycles - Part 4

In the last article we looked at the vapour compression cycle and the behaviour of the recirculating refrigerant (R22) as it passes through the evaporator, compressor and condenser. In this month’s article we continue with the expansion device and ...

1 Mar 2006

Masterclass: Refrigeration Cycles - Part 3

THE PRIMARY refrigerant used in air conditioning for decades is R22 (HCFC22). Whilst its ozone depletion potential (0.05) is much less than other less friendly earlier refrigerants (ODP 1.0), it is still necessary to phase this refrigerant out....