Arlington, TX, United States
Arlington, TX, United States

Time filter

Source Type

News Article | May 15, 2017
Site: marketersmedia.com

— Up to 44 percent of a home’s energy usage comes from the heating and cooling system. If proper insulation isn’t installed beneath the home’s roof, the majority of this heated or cooled air will escape. In fact, up to 78 percent of all heated and cooled air can escape through the roof without proper insulation in place. This represents a huge expense that homeowners can prevent and avoid. In an effort to meet the demand of more efficient homes, Roof Insulation offers several insulation options including Aerolite and Isotherm. “The insulation products we use to help ensure our client’s homes are energy efficient are non-combustible, energy saving, long lasting and eco-friendly,” stated company representative Peter Lategan. “Regardless of the type of insulation you choose to have installed, we guarantee it will provide the energy savings benefits you are looking for. More about the insulation options can be found at https://roofinsulations.co.za.” Isotherm roof insulation is a dust and allergy free option that is also eco-friendly. Aerolite roof insulation offers a long lifespan and typically pays for itself in just two to three years. Each insulation option offered at https://roofinsulations.co.za is offered with a workmanship guarantee and can help home’s save energy. “When we provide insulation installation for home’s we provide a workmanship guarantee,” continued Lategan. “We are also a fully insured company, providing our customers with additional peace of mind that our services can be relied on. We only offer the highest quality products to ensure the best results possible for each customer. We can even provide an initial consultation to learn your goals for the insulation and help you choose the option that will best suit those needs.” Roof Insulation is dedicated to customer service and insulation solutions. Customers in that want to save money on their heating and cooling costs can enjoy the benefits of the insulation options offered by this top rated company. The Roof Insulation company has been serving the Western Cape in South Africa for more than three decades. The staff has an extensive amount of experience providing installation services for all types of insulation products. The services are provided throughout Cape Town and ensure the entire area has energy efficient insulation options that exceed expectations. Customer satisfaction is a top priority for the staff at the Roof Insulation company and customers are provided with a workmanship guarantee. For more information, please visit https://roofinsulations.co.za/


News Article | May 27, 2017
Site: www.gizmag.com

Last time we looked at EarthCruiser, it was shrinking its off-road expedition vehicle hardware markedly with the new GZL pickup camper. This time around, it's growing its rigs, albeit only slightly. At Overland Expo West, the company showcased the new GZL 400 and 500 models that fit larger trucks than the original GZL, which has been modified and numbered the 300. It also advertised a slightly upsized version of its hulking, Fuso 4x4-based FX expedition vehicle. Since expanding operations from Australia to the US about five years ago, EarthCruiser has been growing its US line of expedition vehicles and camper modules. The FX fixed-roof expedition truck joined the EXP pop-top a few years ago, and EarthCruiser turned its attention to those looking for something smaller with last year's GZL introduction. The original GZL model, now named the GZL 300, was designed for midsize pickups like the Toyota Tacoma and Nissan Frontier. To extend GZL availability to other pickup owners, EarthCruiser has developed the larger GZL 400 and 500 models. It didn't have the flatbed-mount 500 on display at Overland Expo, but we did get to look over the slide-in 400. The honeycomb composite-bodied GZL 400 is designed for a list of half-ton pickups that includes American top-sellers like the Ford F-150, Chevy Silverado and Ram 1500. The 400 model is roughly the same length as the 300, about 139.5 in (3,543 mm), but stretches wider, measuring 75.9 in (1,928 mm) from sidewall to sidewall (compared to 68.3 in/1,735 mm on the 300). Weight is in the 800-lb (363-kg) range but will depend upon specific options and equipment. Based on the info and specs EarthCruiser was giving at the show, the 300 and 400 models share the same standard equipment package, but that package has changed since we looked at the original GZL last October. Solar power was originally optional, but the 300 and 400 now come standard with dual 100W Zamp solar panels, a 1000W inverter and a 90Ah AGM battery. They also pack a heater, Elgena 10L water heater, Bose Bluetooth speaker, and 6.5-foot (2-m) awning outside. The kitchen layout has also changed from last year, sliding over to the passenger-side corner, where an L-shaped unit houses a dual-burner propane stove, sink and 1.5-cu ft (42L) Isotherm fridge-freezer. This design lines the sink up with the shower drain, allowing the faucet to pull out and serve as a shower head, a smoother design than the separate hose/hookup EarthCruiser was showing last year. EarthCruiser shows this floor plan for the 300, as well as the 400 featured in our photos. The GZL models sleep three to four people on a combination of cabover bed and convertible dinette below. The dinette seats four people and has storage compartments below the seats. The support platform for the upper bed folds out of the way during the day, opening up headroom in the dinette area. The GZL carries fresh water in a 25-gal (94.6L) tank and propane in a 2.6-gal (10L) tank. A 9-gal (34L) gray water tank collects drainage, and a portable toilet is available optionally, as are a few other upgrades, including a skylight and water purifier. The exterior and interior feature LED lighting for efficiency. Though it has a fuller standard equipment package, the GZL 300's base price remains about the same as we reported last year, US$36,178. The 400 model starts at $43,000. The GZL 400 pictured from Overland Expo is about 90 percent complete, according to the rep we spoke to, and EarthCruiser hopes to finish up and prepare for production within the next few weeks. It makes clear that specifications are subject to change, which we definitely believe seeing how much they've changed over the past seven months. In addition to the new GZL, we spotted another updated EarthCruiser at Overland Expo West, but unfortunately only on a flyer, not before our eyes, in the fiberglass, metal and rubber. The FXX adds a touch of extra backside to the FX model, surrounding the rear-mounted spare tire with added storage space. Instead of a bolt-on solution, this storage area is seamlessly integrated into the FXX body. Because it's flush with the spare tire, the added body doesn't affect the truck's listed 257-in (653-cm) overall length or its ability to fit in a shipping container on its way to overlanding destinations around the world. You can see the difference between the FXX above and the standard FX, which was at the show, below. EarthCruiser hasn't listed an FXX price, but given that it listed the standard FX at between $190,000 and $245,000 in a January 2016 pricing update, it's safe to say "expensive." If you're wondering how EarthCruiser's designs stack up, compare them to the other large expedition machines and smaller camping solutions of Overland Expo West 2017.


Hayes N.,Hill Engineering, LLC | Jokar A.,ThermoFluids Technology | Ayub Z.H.,Isotherm Inc.
International Journal of Heat and Mass Transfer | Year: 2012

Condensation pressure drop of carbon dioxide in brazed plate heat exchangers was investigated, and is presented in this paper. Carbon dioxide is known as an environmental friendly refrigerant with an Ozone Depletion Potential (ODP) equal to zero and Global Warming Potential (GWP) equal to unity, and has favorable thermodynamic and transport properties though it requires higher operating pressures (∼15-30 bar). Brazed-type plate heat exchangers that can withstand high pressure are a good choice for such applications. This paper presents the procedure, data collection, and results for three brazed plate heat exchangers with different inner geometries. The test exchangers showed good performance at high system pressures with reasonable pressure drops (less than 8%). The collected experimental data that covered real world operating conditions are valuable for the design of cascade condensers with carbon dioxide as the low-side refrigerant. © 2012 Elsevier Ltd. All rights reserved.


Khan M.S.,Mohammad Ali Jinnah University | Khan T.S.,Ghulam Ishaq Khan Institute of Engineering Sciences and Technology | Chyu M.-C.,Texas Tech University | Ayub Z.H.,Isotherm Inc.
International Journal of Refrigeration | Year: 2012

Ammonia, an environment friendly natural refrigerant with attractive thermo-physical properties is a potential replacement of the synthetic refrigerants with high ozone depletion and global warming potentials. Experimental heat transfer and pressure drop data are obtained for two phase evaporation of ammonia in a commercial plate heat exchanger for symmetric 30°/30° chevron plates. The plate heat exchanger was configured in a single pass U-type counter flow arrangement with liquid ammonia evaporating in upward flow direction and glycol/water solution simulating the heat load in counter flow. Experiments were carried out for saturation temperatures ranging from -25 °C to -2 °C. The heat flux was varied between 21 kW m -2 and 44 kW m -2. Experimental results show significant effect of saturation temperature, heat and exit vapor quality on heat transfer coefficient and pressure drop. Two phase Nusselt number and friction factor correlations are proposed. © 2012 Elsevier Ltd and IIR. All rights reserved.


Khan T.S.,Ghulam Ishaq Khan Institute of Engineering Sciences and Technology | Khan M.S.,Ghulam Ishaq Khan Institute of Engineering Sciences and Technology | Chyu M.-C.,Texas Tech University | Ayub Z.H.,Isotherm Inc.
International Journal of Refrigeration | Year: 2012

Ammonia is an environment friendly natural refrigerant with attractive thermo-physical properties. Experimental heat transfer and pressure drop data are obtained for evaporation of liquid ammonia in a commercial plate heat exchanger for symmetric 60°/60° (hard) chevron angle plates. Experiments were carried out for mass flux ranging from 8.5 to 27 kg m -2 s -1 at saturation temperatures ranging from -25 °C to -2 °C. The heat flux was varied between 21 kW m -2 and 44 kW m -2. The heat transfer coefficient increased with an increase in saturation temperature and mass flux. Furthermore, heat transfer coefficient was observed to increase with exit vapor quality. The friction factor decreased with exit vapor quality and equivalent Reynolds number, while it increased with the fluid temperature. The work reveals that ammonia has far better heat transfer and pressure drop characteristics compared to HFCs. Two phase Nusselt number and friction factor correlations are also proposed. © 2011 Elsevier Ltd and IIR.


Ayub Z.,Isotherm Inc.
Heat Transfer Engineering | Year: 2015

Editor's Note: We at the Journal of Heat Transfer Engineering are happy to announce the introduction of a new section entitle “Case Studies.” We are asking authors to contribute their practical experiences in the form of real-world case studies. The goal is to disseminate practical information especially to young engineers who are stepping into the real world. The format of such articles will be a full-length paper or a short brief. It does not have to entail a typical research-type paper format with details about measurement accuracies, references, and so on. The article could have a brief introduction with the problem description, remedy, lessons learned, and recommendations. The review process will be simple and less involved than with typical research papers. The goal is not to discredit a person or a company but to share experiences. We all make mistakes; however, we also find solutions, and it is the solution part that is rewarding and that should be shared for the betterment of the society. I am opening this section with my own experience 6 years ago. I expect a positive response from fellow engineers. HTE Case Studies Editor 2016 Copyright © Taylor & Francis Group, LLC


Khan T.S.,Ghulam Ishaq Khan Institute of Engineering Sciences and Technology | Khan M.S.,Ghulam Ishaq Khan Institute of Engineering Sciences and Technology | Chyu M.-C.,Texas Tech University | Ayub Z.H.,Isotherm Inc.
Applied Thermal Engineering | Year: 2010

Corrugated plate heat exchangers have larger heat transfer surface area and increased turbulence level due to the corrugations. In this study, experimental heat transfer data are obtained for single phase flow (water-to-water) configurations in a commercial plate heat exchanger for symmetric 30°/30°, 60°/60°, and mixed 30°/60° chevron angle plates. Experiments were carried out for Reynolds number ranging from 500 to 2500 and Prandtl number from 3.5 to 6.5. Experimental results show significant effect of chevron angle and Reynolds number on the heat transfer coefficient. Based on the experimental data, a correlation to estimate Nusselt number as a function of Reynolds number, Prandtl number and chevron angle has been proposed. © 2010 Elsevier Ltd. All rights reserved.


Case Studies Editor's Note: We at the Journal of Heat Transfer Engineering (HTE) are happy to announce the introduction of a new section entitled “Case Studies.” The first case study was published in vol. 37(3–4) and the second case was published in vol. 37(7–8). This is the third case study in this series. We are asking authors to contribute their practical experiences in the form of real-world case studies. The goal is to disseminate practical information especially to young engineers who are stepping into the real world. The format of such articles will be a full-length paper or a short brief. It does not have to entail a typical research-type paper format with details about measurement accuracies, references, and so on. The article could have a brief introduction with the problem description, remedy, lessons learned, and recommendations. The review process will be simple and less involved than with typical research papers. The goal is not to discredit a person or a company but to share experiences. We all make mistakes; however, we also find solutions, and it is the solution part that is rewarding and should be shared for the betterment of the society. Zahid Ayub HTE Case Studies Editor 2016 Copyright © Taylor & Francis Group, LLC


Case Studies Editor's Note: We at the Journal of Heat Transfer Engineering (HTE) are happy to announce the introduction of a new section entitled "Case Studies." The first case study was published in vol. 37(3-4) and the second case was published in vol. 37(7-8). This is the third case study in this series. We are asking authors to contribute their practical experiences in the form of real-world case studies. The goal is to disseminate practical information especially to young engineers who are stepping into the real world. The format of such articles will be a full-length paper or a short brief. It does not have to entail a typical research-type paper format with details about measurement accuracies, references, and so on. The article could have a brief introduction with the problem description, remedy, lessons learned, and recommendations. The review process will be simple and less involved than with typical research papers. The goal is not to discredit a person or a company but to share experiences. We all make mistakes; however, we also find solutions, and it is the solution part that is rewarding and should be shared for the betterment of the society.Zahid AyubHTE Case Studies Editor. © 2016 Taylor and Francis Group, LLC.


Hayes N.,Hill Engineering, LLC | Jokar A.,ThermoFluids Technology | Ayub Z.H.,Isotherm Inc.
International Journal of Heat and Mass Transfer | Year: 2011

The experimental investigation of carbon dioxide condensation in brazed plate heat exchangers is the main objective of this study. The current level of concern for the environment is at an all time high, therefore, it is important to look into methods and resources that lead to a cleaner and healthier future for the planet. This study details one such effort to reach this goal, focusing on condensation of carbon dioxide as a natural refrigerant in refrigeration systems. Three brazed plate heat exchangers with different geometry, each consisting of three channels, are tested. This paper focuses on the two-phase analysis, where carbon dioxide was the working fluid, flowing through the middle channel, and dynalene brine, the cooling fluid, flowed through the side channels of each geometry. Condensation of carbon dioxide occurred at saturation temperatures ranging from -17.8 °C to -34.4 °C and heat fluxes spanning 2.5-15.7 kW/m2. An in-depth dimensional analysis was completed on the two-phase data yielding heat transfer correlations. Relationships of the two-phase heat transfer characteristics are presented, the data are compared with related studies, and conclusions are made from the two-phase data. © 2010 Elsevier Ltd. All rights reserved.

Loading Isotherm Inc. collaborators
Loading Isotherm Inc. collaborators