scholarly journals Alternative Refrigerant Evaluation for High-Ambient Temperature Environments: R-22 and R-410A Alternatives for Mini-Split Air Conditioners

2015 ◽  
Author(s):  
Omar Abdelaziz ◽  
Jeffrey D. Munk ◽  
Som S. Shrestha ◽  
Randall Lee Linkous ◽  
William Goetzler ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
High Ambient Temperature ◽  
Alternative Refrigerant ◽  
Air Conditioners

scholarly journals Alternative Refrigerant Evaluation for High-Ambient-Temperature Environments: R-22 and R-410A Alternatives for Mini-Split Air Conditioners

2015 ◽  
Author(s):  
Omar Abdelaziz ◽  
Som S. Shrestha ◽  
Jeffrey D. Munk ◽  
Randall Lee Linkous ◽  
William Goetzler ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
High Ambient Temperature ◽  
Alternative Refrigerant ◽  
Air Conditioners

scholarly journals Experimental modeling of refrigerants at high ambient temperature

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Sahar Ajrawi ◽  
◽  
Sorour Alotaibi ◽  
Walid Chackroun ◽  
◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Air Conditioning ◽  
Elevated Temperatures ◽  
Experimental Testing ◽  
High Ambient Temperature ◽  
Experimental Results ◽  
Coefficient Of Performance ◽  
Alternative Refrigerant ◽  
Experimental Conditions ◽  
Promising Alternative

High ambient temperature is well known to have an adverse impact on air conditioners; it lowers their cooling capacity along with their coefficient of performance. Moreover, air conditioning plays a significant role in damaging the environment as it contributes to both global warming and ozone depletion. In the past few decades, the Montreal agreement was introduced to protect the ozone layer from substances that contribute to its depletion. Developing countries are now facing the challenges of phasing out HCFCs such as R22 in the air conditioning sector. The aim of this study is to find an alternative refrigerant that can replace R22 after its phase out. The new refrigerant must have low environmental impacts and should be able to withstand operation in high ambient temperature countries. In this study, the hydrocarbon refrigerant R290 and the hydrofluorocarbon R410A were selected as alternatives. Furthermore, experimental testing was carried out on the baseline refrigerant R22 and R410A using a 7kW ducted split unit at three outdoor conditions: 35oC, 48oC, and 52oC. From the experimental results, a model based on R22 and R410A was developed using Engineering Equation Solver (EES). The model was successful in verifying the experimental results within a 15% error range and was tested again with external data from (Eltalouny & Nielsen, 2016) [10]. After confirming its validity, the model was simulated to predict the performance of the alternative refrigerant R290 under the same experimental conditions and input data. To test the model’s validity on R290, results from Eltalouny & Nielsen (2016) were used. The model succeeded in predicting the COP and power consumption. The refrigerants demonstrated deterioration in their performance at elevated temperatures compared to their performance at a typical operating regime. With proper safety measures, and enhancement to the compressor efficiency, R290 can be considered as a promising alternative.

scholarly journals High ambient temperature and child emergency and hospital visits in New York City

2021 ◽  
Author(s):  
Li Niu ◽  
Maria Teresa Herrera ◽  
Blean Girma ◽  
Bian Liu ◽  
Leah Schinasi ◽  
...  
Keyword(s):  
New York ◽  
New York City ◽  
Ambient Temperature ◽  
York City ◽  
High Ambient Temperature ◽  
Hospital Visits

PSVII-24 Blend of essential oils plus 25-hydroxy-vitamin-D3 as alternative to the use monensin on growth performance and dietary energetics in feedlot cattle raised under high ambient temperature

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 452-453
Author(s):  
Daniel Mendoza-Cortés ◽  
Jorge L Ramos-Méndez ◽  
Adrián Félix-Bernal ◽  
Alfredo Estrada-Angulo ◽  
Manuel Franco ◽  
...  
Keyword(s):  
Essential Oils ◽  
Ambient Temperature ◽  
Vitamin D3 ◽  
Animal Health ◽  
Average Daily Gain ◽  
Feedlot Cattle ◽  
High Ambient Temperature ◽  
Energy Utilization ◽  
Daily Weight Gain ◽  
Final Weight

Abstract Ninety young crossbreed bulls (approximately 25% Zebu breeding with the remainder represented by continental and British breeds in various proportions, initial weight=228.04±7.06 kg) were used in a 84-day feeding trial to assess the effects of treatments in feedlot cattle fed transition diets during high ambient temperatures. Treatments consisted of a steam-flaked corn-based diets (average 1.95 Mcal ENm/kg) supplemented with: 1) 20 mg monensin/kg diet (MON, Rumensin, Elanco Animal Health, Indianapolis, IN], and 2) 100 mg of blend of essential oils /kg diet plus 0.1 mg 25-hydroxy-vitamin-D3/kg diet (EO+HyD; CRINA® Ruminants and HyD®, DSM Nutritional Products, Basel, Switzerland). Both dry matter intake (DMI) and climatic variables were measured daily and the temperature humidity index (THI) was estimated. Daily maximal THI remained over 80 during the whole trial (avg. THI = 82.67). Cattle supplemented with EO+HyD increased average daily gain in 8.7% (1.446 vs. 1.320 kg/day, P < 0.01), gain-to-fed ratio in 4.5% (0.199 vs. 0.190; P = 0.03), final weight in 10.05 kg (349.48 vs. 339.43; P = 0.04) and tended (P = 0.07) to shown greater dietary net energy (2.5%) and observed-to-expected dietary NE ratio (3%). Even when EO+HyD tended to increase (4.3%; P = 0.06) DM intake, intake pattern variation were not different (P = 0.38) between MON and EO+HyD (Figure 1). Then, difference in ADG and final BW between MON and EO+HyD was not only a reflection of difference in energy intake, was also caused by difference in efficiency of energy utilization during conditions of high ambient temperature (a reduction of 7% in the estimated increase of coefficient of maintenance by heat load). Results indicate that supplementation with a combination of essential oil blend plus 25-hydroxy-vitamin-D3 can have greater beneficial effects than supplemental monensin on daily weight gain, final weight and feed intake during initiation-transition phase of cattle raised under high ambient temperature.

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