Drainline Heat Exchangers

first_imgAlex is founder of BuildingGreen, Inc. and executive editor of Environmental Building News. He also recently created the Resilient Design Institute. To keep up with Alex’s latest articles and musings, you can sign up for his Twitter feed. No moving parts, nothing to wear outThe beauty of drainline heat exchangers is that there are no moving parts, nothing the wear out, and nothing to get clogged. Only fresh water goes through the small-diameter supply pipes; any hair or other materials pass through a standard, smooth drain pipe. Several versionsThere are four manufacturers of drainline heat exchangers that I’m aware of: Vasile’s original company, WaterFilm Energy of Medford, New York, and three Canadian companies: EcoInnovation Technologies of St-Louis-de-Gonzague, Quebec, which makes the Eco-GFX; ReTherm Energy Systems of Summerside, Prince Edward Island; and RenewAbility Energy of Kitchener, Ontario, which makes the Power-Pipe.Most of these have a single 1/2-inch copper pipe coiled around a length (typically three to five feet) of 2-inch or 3-inch diameter drain pipe.The Power-Pipe is a little different than the others. It has a header that splits the supply pipe into four smaller, square-cross-section pipes that provide more surface area for heat transfer.Most of these manufacturers offer various lengths and diameters of drainline and can accommodate different supply pipe diameters. GBA Encyclopedia: Drain-water heat recoveryGBA Product Guide: Domestic Water Heat ReclaimersQ&A: Plumbing question – Domestic Water Heat Reclaimer CostInstalled in a new home, drainline heat exchangers typically cost $500 to $800 (including installation). Costs in multifamily buildings should be lower. In some states there are rebates available for such systems. How a drainline heat exchanger worksThe process is pretty simple. A special section of copper drainpipe is installed beneath a shower (typically the largest hot water use in a home) or other hot wastewater source. This section of drainpipe has smaller-diameter copper piping wrapped tightly around it. The cold-water supply pipe leading into the water heater is diverted so that it flows through the small-diameter copper pipe. RELATED ARTICLES When hot water is being pulled from the water heater to supply the shower, the water going into the water heater is preheated by the wastewater going down the shower drain. If it’s a tankless — rather than storage — water heater, the incoming water temperature will be higher, so less energy will be required to get it up to the needed delivery temperature — thus saving energy (though the tankless water heater has to be thermostatically controlled and, thus, able to deal with inlet water of varying temperature).The man who invented the drainwater heater exchanger, Carmine Vasile, called the product a GFX, for “gravity-film exchange,” recognizing that water going down a vertical pipe forms a film that clings to the inner walls of the pipe where the heat can effectively be transferred through the copper to the supply water. Over the past few weeks I’ve written about various strategies to produce hot water efficiently. We’ve seen that tankless water heaters are more efficient than storage water heaters (though are not without their drawbacks), and we’ve learned that heat-pump water heaters produce two to three times as much heat per unit of electricity consumed as electric water heaters that rely on electric resistance heat.But the unfortunate reality is that even with the most efficient methods of generating hot water, we still lose the vast majority of that heat down the drain. Domestic hot water is a once-through product. I’ve seen estimates that 90% of the heat in hot water is lost down the drain. Dan Cautley, an energy engineer with the Energy Center of Wisconsin, says that drain water “may be one of our largest untapped resources.”It turns out that we can do something about that. In the right application, drainline heat exchangers allow a significant portion of the heat from hot water going down the drain to be recovered. Maximizing recovery efficiencyAccording to an article in Environmental Building News, heat recovery efficiency can be as high as 60% — which can effectively double the water heating efficiency. Just how much benefit a drainline heat exchanger will provide will depend on usage patterns and how the plumbing in a house is configured.For the highest rate of heat recovery, it is ideal if all household members use the same shower (or have several showers that drain through the same vertical length of drainline). It helps if the water heater is in a basement (or beneath the showers and close by, so that there is minimal length of supply piping from the heat exchanger to the water heater).These systems are even more cost-effective in schools and commercial buildings that use a lot of hot water: school shower facilities, health clubs, laundromats, commercial kitchens, etc.last_img read more

352 Free Letterbox Templates for Video Editing (8K, 4K, HD & More)

first_imgThe templates (seen above) can be used to convert footage into the following aspect ratios:1:1 Square4:3 Silent Film/NTSC1.37:1 Academy Ratio1.43:1 IMAX3:2 Classic 35mm7:4 Metroscope1.85:1 Vistavision2:1 Panascope & RED2.2:1 Todd AI2.35:1 Cinemascope2.39:1 Theatrical & Blu-ray2.55:1 Vintage Cinemascope2.75:1 Ultra Panavision2.76:1 MGM Camera 653:1 Extreme Scope4:1 PolyVisionAll of the templates are available in both black and white letterbox formats.Using the Free Letterbox TemplatesThese free letterbox templates are incredibly easy to use and manipulate. All of the files are PNG images with alpha channels. To use the templates, simply drag and drop the appropriate resolution letterbox above your sequence in your video editing application of choice.DOWNLOAD FREE LETTERBOX TEMPLATES Easily give your videos the cinematic cropping they deserve with these free high-res letterbox templates for video editing.Despite having the ability to export footage in virtually any resolution, filmmakers and video producers are still limited to showing their work on screens with a very specific aspect ratios. Because of this, you need to export your footage with letterboxes if you want to view your footage in an aspect ratio that’s different than 16:9.What Are Letterbox Templates?Simply put, letterboxes are small bars that can be applied to your footage to give them an irregular aspect ratio while still retaining their 16:9 size. Letterboxes can be used to crop footage shot in 16:9 to a more cinematic 2.35:1. They can also be a great tool for pre-visualizing how your video will be cropped on an irregularly sized screen.In the past if you wanted to drop letterboxes into your project, you had to either download a limited free template or create your own. These options aren’t ideal — so we created a future-proof pack full of letterbox templates for virtually every format in the world.What’s in the Free Letterbox Template Pack?Our free pack of 352 letterbox templates includes templates for every popular video resolution in the world, including:HD 720HD 10802K2.5K3K3K HD4K4K UHD5K6K8Klast_img read more

Pawar to Rahul: premature to talk about prime ministership

first_imgPune: Nationalist Congress Party (NCP) chief Sharad Pawar on Wednesday urged Congress president Rahul Gandhi to avoid making premature remarks about the prime ministership before the parliamentary polls. “There is a proverb in Marathi: bajaarat toori ani bhat bhatnila maari (the lentil pod is still in the market and the priest is beating up his wife). This means there is an argument about something that does not merit any discussion. So, let the ‘tur’ come first and then discuss,” Mr. Pawar said in Satara. “It is too early to talk or indulge in wishful thinking about future calculations. Let us first contest the elections and win a sizeable number of seats in order to be able to form a government,” Mr. Pawar said.At the same time, the NCP leader acknowledged that only the Congress, among all opposition parties, has a traditional presence in all states as opposed to the Trinamool Congress, Samajwadi Party, or the Telangana Rashtra Samiti. Mr. Gandhi on Tuesday had said he is ready for the PM’s job if the Congress wins the 2019 Lok Sabha elections.last_img read more

Bihar shelter home rape: Opposition leaders unite in protest

first_imgRashtriya Janata Dal successfully managed to bring the issue of alleged mass rape at a shelter home in Muzaffarpur, Bihar at the centre stage with a joint opposition protest at Jantar Mantar on Saturday.RJD leader Tejashwi Yadav was joined by Congress president Rahul Gandhi, Delhi Chief Minister Arvind Kejriwal, CPI(M)’s Sitaram Yechury, CPI’s D. Raja and Atul Kumar Anjan, Loktantrik Janata Dal leader Sharad Yadav and Trinamool Congress’ Dinesh Trivedi.Mr. Gandhi said that the country had made up its mind against the BJP government. Pointing out that the Opposition was united on the stage, Mr. Gandhi said, “On one side is the BJP/RSS and on the other is the rest of the country. Indians are saying that they do not like what happened in the last four years.”Mr. Gandhi said Chief Minister Nitish Kumar must immediately act against the culprits in the sexual assault case in the Muzzafarpur shelter.In a 12-minute speech, Tejashwi Yadav accused the Nitish Kumar government of turning a blind eye to the crime. “Nitish ji says he is hurt and is sad. Then why did he get the prime accused Brajesh Thakur’s name removed from the FIR… why did he take this long to act on social audit by TISS?” he questioned.He said that Bihar was living under ‘Rakshas Raj’, giving references from the Mahabharata and the Ramayana. “In Bihar, Raavan is kidnapping Sita every minute. Every minute, a Duryodhan is de-robing a Draupadi,” he said. Delhi Chief Minister Arvind Kejriwal said fast track courts should be set up to award the death sentence to the accused for such a heinous crime.”I demand that this case be probed in three months and the accused be hanged,” he said.He also sought to remind the JD(U)-BJP government in Bihar that the foundation of the UPA government had been rocked following the protest over Nirbhaya’s rape.This was the first political protest where Mr. Gandhi shared the stage with Mr Kejriwal. During Mr Kejriwal’s protest at the Delhi Lieutenant Governor’s office, the Congress had refused to support AAP. CPI(M) General Secretary Sitaram Yechury said BJP’s slogan “beti bachao” needed reworking. “We need to change this government… the slogan of ‘beti bachao’ is now ‘save beti from BJP’,” he said. Former JD(U) leader Sharad Yadav said the BJP was not saving the daughters of the country but was busy saving cows.last_img read more

I am not married to filmmaker Aditya Chopra, says Rani Mukerji

first_imgBollywood actor Rani Mukerji, who has rubbished rumours that she is married to filmmaker Aditya Chopra, says she has left her marriage destiny to god. “My name has been linked with several people, but upar waala (god) will decide who will become my life partner,” Rani said in reply to queries in Rajat Sharma’s show Aap Ki Adalat, aired on India TV.Mukerji, whose latest film Aiyyaa released Friday, reacted strongly to media reports about her secret marriage to Aditya, elder son of acclaimed filmmaker Yash Chopra.”The media can’t even decide which year the wedding took place. Was it 2007, or 2009, or 2012? Let them (media) make up their mind first.””I am fortunate that the people of this country consider me as their daughter and they are worried about my marriage. But birth, death and marriage are in the hands of ‘upar waala’ and what is ordained, shall happen,” said the actress, who sported a rudraksha string on her left wrist.”As far as my marriage with Aditya is concerned, I can only say, Main toh abhi kunwaari hoon (I am still unmarried),” she added.last_img read more