ISO 5151:2017 does not cover the determination of seasonal efficiencies, which can be required in some countries because they provide a better indication of efficiency under actual operating conditions.
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Buy this standard Life cycle Previously Withdrawn ISO 5151:2010 Now Published ISO 5151:2017 A standard is reviewed every 5 yearsStage: 90.93 (Confirmed) 00 Preliminary 10 Proposal 10.99 2013-05-08 New project approved 20 Preparatory 20.00 2013-05-08 New project registered in TC/SC work programme 20.20 2013-05-08 Working draft (WD) study initiated 20.60 2014-10-31 Close of comment period 20.99 2015-08-10 WD approved for registration as CD 30 Committee 30.99 2015-08-10 CD approved for registration as DIS 40 Enquiry 40.00 2015-08-25 DIS registered 40.20 2015-10-29 DIS ballot initiated: 12 weeks 40.60 2016-01-31 Close of voting 40.99 2016-04-12 Full report circulated: DIS approved for registration as FDIS 50 Approval 50.00 2016-11-18 Final text received or FDIS registered for formal approval 50.20 2017-03-29 Proof sent to secretariat or FDIS ballot initiated: 8 weeks 50.60 2017-05-26 Close of voting. Proof returned by secretariat 60 Publication 60.00 2017-05-26 International Standard under publication 60.60 2017-07-21 International Standard published 90 Review 90.20 2022-07-15 International Standard under systematic review 90.60 2022-12-03 Close of review 90.93 2022-12-13 International Standard confirmed 90.20 International Standard under systematic review 90.60 Close of review 90.99 Withdrawal of International Standard proposed by TC or SC 95 Withdrawal 95.99 Withdrawal of International Standard Corrigenda / Amendments Published ISO 5151:2017/Amd 1:2020 Got a question?Check out our FAQs
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ISO 5151:2010 specifies the standard conditions for capacity and efficiency ratings of non-ducted air-cooled air conditioners and non-ducted air to air heat pumps. It is applicable to ducted units rated at less than 8 kW and intended to operate at an external static pressure of less than 25 Pa. ISO 5151:2010 also specifies the test methods for determining the capacity and efficiency ratings.
Abstract:It is well known that inverter-driven variable-speed compressor (or inverter) air conditioners are more efficient than constant-speed compressor air conditioners. Therefore, most countries have employed part-load assessment test standards such as ISO 16358, EN 14825 and ASHRAE 116 in addition to the conventional ISO 5151 full-load test standard to appropriately evaluate the part-load efficiencies of variable-speed air conditioners. However, many countries in the Middle East and South America still use the ISO 5151 standard owing to policy or high- temperature environmental considerations. In this study, we experimentally verify the energy saving effect of the inverter air conditioner with respect to the constant-speed air conditioner under the Korean climate with distinct temperature changes of four seasons and under the hot climate of Saudi Arabia throughout the year. ISO 5151 defines test conditions for a single temperature, whereas ISO 16358, EN 14825 and ASHRAE 116 simulate seasonal efficiencies using interpolation of several climate test results. Herein, we directly employ the environmental changes during a day or season in a qualified test room with specific dimension. Using extensive regional and seasonal climate data for Saudi Arabia and South Korea, the changes in temperature conditions are applied directly to the outdoor side and appropriate building cooling load conditions are applied to the indoor side of the air-enthalpy-type test room. The energy savings of the inverter air conditioner were analyzed experimentally according to the spatial and temporal temperature changes. The energy reduction effects of the inverter air conditioner largely depended on the temperature and cooling load changes for a day or season. Furthermore, a feasibility study based on an energy simulation showed that the variable-speed air conditioner could be economical even in hot climates.Keywords: energy saving; inverter air conditioner; energy efficiency; Saudi Arabia; Korea
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Students should contact Student Computing Services. Faculty/Staff should contact the OTS Faculty/Staff Help Center at 410-704-5151 or submit a TechHelp ticket for assistance using this request type: Employee > Collaboration, Video Conferencing, etc. > Zoom.
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Synthesizing these data and data from other trials examining reamputation, two recent meta-analyses of postamputation outcomes among patients with diabetes estimated a 1-year reamputation rate of 19.8% after partial ray amputation7 and 28.4% after transmetatarsal amputations (TMAs).9 However, these studies only reported data on certain distal index amputations. They were also limited in reporting only at specific durations after an index amputation instead of reporting a reamputation-free survival distribution over time. Additionally, neither study considered whether the subsequent amputation occurred to the same or contralateral limb. Finally, neither study considered how reamputation rates are evolving over time.
Thus, closer scrutiny and analysis of all available evidence is needed to understand the progression of limb loss for patients with diabetes after any level of index amputation. The purpose of this study is to synthesize available data on reamputation rates and estimate the reamputation-free survival following index amputations of all levels for those with diabetes and to determine whether reamputation rates have improved over time.
Reamputation-free survival curves for contralateral reamputations (left) and all reamputations (right) among patients with diabetes. The solid line is the maximum-likelihood estimate of the log-logistic survival model. The shaded area represents the IQR.
The incidence of lower extremity reamputation is high among patients with diabetes who have undergone initial amputations secondary to diabetes. Long-term reamputation-free survival decreased with longer follow-up, and patients with diabetes are at a distinctly higher risk of reamputation at any follow-up lengths. For all-level or contralateral reamputation rates, the lack of significant downward trends over the past 50 years calls for improved prevention efforts. This systematic review and meta-analysis revealed high heterogeneity in study design and confirmed the need to standardize outcome reporting methods in future studies. Additional focus on prevention for those with recent amputations is necessary to reduce overall incidence of LEA. 2ff7e9595c