Global warming potential values the following table includes the 100year time horizon global warming potentials gwp relative to co2. Hydrofluorocarbons hfcs, which are currently used as refrigerants in airconditioning ac systems, are potent greenhouse gases, with high values of global warming potential gwp. Refrigerants that have a modest gwp can be sufficient for bringing down emissions. The ar5 values are the most recent, but the second assessment report 1995 and fourth. Global warming potential gwp is a measure of how much heat a greenhouse gas traps in the atmosphere up to a specific time horizon, relative to carbon dioxide. Reduce refrigerant gwp by 50% 5% direct warming impact refrigerant leakage eliminate 55% of global warming impact reduce direct impact by 92% 3. This whitepaper discusses the global trends within refrigeration and air conditioning. The global warming potential gwp is a measure of the potency of a greenhouse gas relative to carbon dioxide where carbon dioxide, by definition, has a gwp value of 1. Low global warming potential refrigerants for direct hvac applications date helen walterterrinoni, vp regulatory affairs, airconditioning, heating, and refrigeration institute. Limited options for lowglobalwarmingpotential refrigerants. It assigns a value to the amount of heat trapped by a certain mass of a gas relative to the amount of heat trapped by a similar mass of carbon dioxide over a specific period of time. Global warming potential gwp is a measure of the relative global warming effects of different gases. Gwp is a relative scale which compares the amount of heat trapped by greenhouse gas to the amount of heat trapped in the same mass of carbon dioxide. W ith the ratification of the montreal protocol in 1987, chlorofluorocarbon cfc and hydrochlorofluorocarbon hcfc refrigerants, such as r11, r12, r22, and r123, have been or will soon be phased out due to their high ozone depleting potential odp.
Low global warming potential refrigerants for direct hvac. Refrigerants for lower global warming potential explore. It will help you understand current and future refrigerants and technologies, with focus on global warming potential, energy consumption, and system efficiency. Highgwp refrigerants california air resources board. Common refrigerants and their ozone depletion potential odp and global warming potential gwp are indicated below.
Linde strongly advocates the use of refrigerant gases with zero ozone depletion. Global warming potential gwp is a measure of how much a given mass of a gas contributes to global warming. The following is a list of refrigerants with their typeprefix, ashrae designated numbers, iupac chemical name, molecular formula, cas registry number blend name, atmospheric lifetime in years, semiempirical ozone depletion potential, net global warming potential over a 100year time horizon, occupational exposure limitpermissible exposure limit in parts per million volume per volume. Must be free of residual material and vapor before storage for. This site is like a library, you could find million book here by using search box in the header. All books are in clear copy here, and all files are secure so dont worry about it. They have a very low or zero global warming potential and zero ozone depletion potential.
Reduce refrigerant leak to 10% per year, refrigerant gwp by 50%, and reduce charge by 65% 40% indirect warming impact energy consumption for large systems, global warming becomes an efficiency. The hfc refrigerants commonly in use today have gwp values that are thousands of times larger than that of carbon dioxide. The gwp of a gas refers to the total contribution to global warming resulting from the emission of one unit of that gas relative to one unit of the reference gas, co2, which is assigned a value of 1. Global warming potential, or gwp, is a measure of how destructive a climate pollutant is.
1116 1299 278 926 710 1417 696 1196 125 1137 671 1237 547 264 1570 814 661 199 785 1667 453 1134 1277 1021 1197 421 1004 143 1235 748 549 551 1335 8 XML HTML