scholarly journals Developing a hot-water drill system for the WISSARD project: 2. In situ water production

2014 ◽  
Vol 55 (68) ◽  
pp. 298-302 ◽  
Author(s):  
Daren S. Blythe ◽  
Dennis V. Duling ◽  
Dar E. Gibson
Keyword(s):  
Waste Heat ◽  
Hot Water ◽  
Water Production ◽  
Initial Water ◽  
Diameter Hole ◽  
Water Heaters ◽  
Whillans Ice Stream ◽  
The Antarctic ◽  
Drill System

AbstractSuccessful hot-water drilling in the Antarctic is predicated on utilization of the abundant water supply available in the form of the Antarctic ice sheet. For WISSARD (Whillans Ice Stream Subglacial Access Research Drilling) field operations, a snowmelting system was developed that could adequately provide water for a 1000 kW hot-water drill. The system employs ∼100 kW of waste heat from a 225 kW generator to melt snow for initial water (known as seed water) to prime the drill’s high-pressure pumps and water heaters; once the water heaters can be engaged in snowmelting, enough water can be supplied directly to the WISSARD drill to successfully melt a 40 cm diameter hole through 800 m of ice.

scholarly journals THE OPTIONS OF WASTE HEAT UTILIZATION IN A BUILDING OF MEDICAL PRODUCT’S MANUFACTURE

2020 ◽  
Vol 12 (0) ◽  
pp. 1-6
Author(s):  
Giedrius Šiupšinskas ◽  
Martynas Blinstrubis
Keyword(s):  
Production Systems ◽  
Waste Heat ◽  
Hot Water ◽  
Water Production ◽  
Engineering Systems ◽  
Heat Flows ◽  
Medical Products ◽  
Design Variant ◽  
Flow Demand ◽  
Waste Heat Utilization

This article examines the possibilities of using waste heat in a building for the production of medical products. During the production, 6 compressors operate continuously, and the generated excess heat is removed through coolers or partially used in building heating, ventilation and domestic hot water production systems. The aim of this article is to model and evaluate the possibilities of using waste heat after performing the analysis of heat flow demand of all the engineering systems. The pinch method is used to achieve this goal. Heat flows and heat exchanger network are modelled using PinCH 3.0 software. The performed assessment shows that with the help of pinch analysis, in the analysed object it is possible to recover and use more than 20% of waste heat as compared to the initial design variant.

scholarly journals Modeling hole size, lifetime and fuel consumption in hot-water ice drilling

2014 ◽  
Vol 55 (68) ◽  
pp. 115-123 ◽  
Author(s):  
L. Greenler ◽  
T. Benson ◽  
J. Cherwinka ◽  
A. Elcheikh ◽  
F. Feyzi ◽  
...  
Keyword(s):  
Water Flow Rate ◽  
Hot Water ◽  
Hole Size ◽  
South Pole ◽  
Neutrino Detector ◽  
Water Ice ◽  
Fuel Savings ◽  
Highly Sensitive ◽  
The Antarctic ◽  
Drill System

AbstractIceCube, a cubic-kilometer neutrino detector, was built at the South Pole using a hot-water drill system. Deep holes were drilled into the Antarctic ice sheet and filled with highly sensitive optical instrumentation. For the hot-water drilling, a computer model was developed to predict the hole sizes and hole lifetimes during construction. The goal was to predict ultimate size and freezeback rates based on water flow rate and temperature, drill speed, ice temperature and ream parameters (for a secondary operation where hot water continues to flow as the drill is withdrawn). This model proved to be very successful. It increased confidence that the holes would remain open long enough after drilling to allow the deployment of the necessary instrumentation. It also allowed for a decrease, over the course of the project, in the amount of overdrilling that was used as a margin against a too-rapid freeze-in. This resulted in significant fuel savings.

Fractionation of wood polymers by carboxymethylation: Exploring the strategy

TAPPI Journal ◽  
2012 ◽  
Vol 11 (1) ◽  
pp. 29-37 ◽  
Author(s):  
SHANG-NING CHIEN ◽  
THOMAS E. AMIDON ◽  
YUAN-ZONG LAI
Keyword(s):  
Industrial Applications ◽  
Water Soluble ◽  
Hot Water ◽  
Insoluble Residue ◽  
Cellulose Derivatives ◽  
Initial Water ◽  
Pre Treatment ◽  
Cellulose Component ◽  
Derivatives Of

We explored the feasibility of fractionating wood polymers in situ by carboxymethylation to yield the carboxymethyl derivatives of cellulose (CMC), hemicelluloses, and lignin for potential industrial applications. The initial water-soluble materials formed were a mixture of hemicelluloses and cellulose derivatives, and also contained some lignin (3%–5%). Interestingly, the water-insoluble residue after another carboxymethylation treatment gave essentially a CMC product containing less than 1% of residual lignin. Thus, the bulk of wood lignin is less reactive than the polysaccharide components under typical carboxymethylation conditions. Also, a hot water pre-extraction or dilute acid pre-treatment of wood samples was found to significantly enhance the reactivity of the cellulose component. A preextraction approach would facilitate CMC preparation and also provide the flexibility to convert the extracted hemicelluloses to other bio-based fuels or materials.

A Study on Waste Heat Recovery in Drain Water with Water-to-Water Heat Exchanger in Barbershops

2012 ◽  
Vol 608-609 ◽  
pp. 1231-1235
Author(s):  
Fang Tian Sun ◽  
Na Wang ◽  
Xiao Gang Gong ◽  
Yun Ze Fan ◽  
De Ying Li
Keyword(s):  
Heat Exchanger ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Hot Water ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Waste Heat Recovery System ◽  
Heat Utilization ◽  
Water Heaters

Heat utilization efficiency of barbershop was about 16.7% in China, because the low-temperature waste water at 30～36°C was directly discharged into sewer. And match of energy grade was not appropriate, because electric water heaters were used to producing hot water at 55～70°C in most of barbershops. A waste heat recovery system with water-to-water heat exchanger (WHR-HE) was presented, according to heat utilization characteristics of barbershop and scientific principle of energy utilization. WHR-HE was analyzed by the first Law of thermodynamics and economics. The analyzed results show that energy consumption can be reduced about 75%, and incremental payback period is less one year for WHR-HE. There is optimal cold side temperature difference of water-to-water heat exchanger.

scholarly journals Microbiology: lessons from a first attempt at Lake Ellsworth

2016 ◽  
Vol 374 (2059) ◽  
pp. 20140291 ◽  
Author(s):  
D. A. Pearce ◽  
I. Magiopoulos ◽  
M. Mowlem ◽  
M. Tranter ◽  
G. Holt ◽  
...  
Keyword(s):  
Local Environment ◽  
Hot Water ◽  
Critical Question ◽  
Ongoing Research ◽  
Subglacial Lake ◽  
Scientific Instrumentation ◽  
Signy Island ◽  
The Antarctic ◽  
Microbiological Analyses

During the attempt to directly access, measure and sample Subglacial Lake Ellsworth in 2012–2013, we conducted microbiological analyses of the drilling equipment, scientific instrumentation, field camp and natural surroundings. From these studies, a number of lessons can be learned about the cleanliness of deep Antarctic subglacial lake access leading to, in particular, knowledge of the limitations of some of the most basic relevant microbiological principles. Here, we focus on five of the core challenges faced and describe how cleanliness and sterilization were implemented in the field. In the light of our field experiences, we consider how effective these actions were, and what can be learnt for future subglacial exploration missions. The five areas covered are: (i) field camp environment and activities, (ii) the engineering processes surrounding the hot water drilling, (iii) sample handling, including recovery, stability and preservation, (iv) clean access methodologies and removal of sample material, and (v) the biodiversity and distribution of bacteria around the Antarctic. Comparisons are made between the microbiology of the Lake Ellsworth field site and other Antarctic systems, including the lakes on Signy Island, and on the Antarctic Peninsula at Lake Hodgson. Ongoing research to better define and characterize the behaviour of natural and introduced microbial populations in response to deep-ice drilling is also discussed. We recommend that future access programmes: (i) assess each specific local environment in enhanced detail due to the potential for local contamination, (ii) consider the sterility of the access in more detail, specifically focusing on single cell colonization and the introduction of new species through contamination of pre-existing microbial communities, (iii) consider experimental bias in methodological approaches, (iv) undertake in situ biodiversity detection to mitigate risk of non-sample return and post-sample contamination, and (v) address the critical question of how important these microbes are in the functioning of Antarctic ecosystems.

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