Justifying heat pumps for domestic use can be tricky, particularly in older buildings and in colder climates. Operating efficiency is critical to the financial case and small systems operating at cold source temperatures with a need for high temperature hot water are a tough proposition.
There are lots of things that can be used to heat our homes... back in the day we just knew if that if we chopped enough logs through the day the reward would be to sit in front of a roaring fire watching the flames dance and hearing the distinctive crackle of burning pine.
It has been very hard for me to come to terms with the fact that, in the heat pump world, the cooling effect that I value so highly is often thrown away, whereas what I considered to be waste, and to be honest was often a pesky nuisance, is a highly valued commodity and can be sold for a handsome profit. It's a funny old world.
Advancement in low charge ammonia technology was a key discussion point at the 34th International Association for Cold Storage Construction (IACSC) Conference & Expo, celebrated in Florida last month. The phase out of R22 refrigerant by 2020 under the Montreal Protocol and increasing interest in ammonia charge from the EPA and OSHA has resulted in owners and operators of temperature controlled facilities turning to low charge ammonia solutions for new and existing facilities.
Last month, we looked at a future where quantom sensors would provide a wealth of information about system performance and product quality, but there will be little point in getting there if we can't make sense of the sensors in the first place.
The leader in low charge ammonia, Azane Inc, will showcase its Azanechiller and Azanefreezer technology at the International Association for Cold Storage Construction (IACSC) Conference & Expo in Florida from 6-9 November.
AMMONIA LOW-PRESSURE RECEIVER SYSTEMS - This article is based on a presentation at the 2012 IIAR Industrial Refrigeration Conference. The paper received the Andy Ammonia Award for best paper at the conference.
By S. Forbes Pearson, Ph.D.
There has been a great deal of discussion in recent years of the merits of “low charge” systems. The incentives to follow this trend are diverse, ranging from the flammability of hydrocarbons or the toxicity of ammonia to the expected higher cost of the new fluids
currently under development and not yet on the market.
The second of this two-part article looks at the practical side of refrigerant phaseout and outlines the various options available, along with some key considerations to help professionals plan for the future.
Star Refrigeration's US subsidiary Azane Incorporated was one of 250 refrigeration end users, HVACR contractors, regulators and industry associations who met in San Francisco to discuss natural refrigerants and the impending R22 phase-out.