Is a Ground-Source Heat Pump a Renewable Energy System?

first_imgAllison Bailes of Decatur, Georgia, is a RESNET-accredited energy consultant, trainer, and the author of the Energy Vanguard blog. A poor choice of terminologyI think the main source of the confusion about ground-source heat pumps and renewable energy is the unfortunate use of the term “geothermal” in connection with these devices. When you hear the word “geothermal,” you think of lava or geysers, of volcanoes blowing their tops. You think of beautiful Icelandic maidens in steaming pools of hot water surrounded by snow. (Or is that just me?) You think of heat engines being driven and doing useful work by harnessing the heat from within the earth.But that’s not what ground-source heat pumps are or do. They’re just like your regular air conditioner or heat pump except they use the ground instead of the air as the source or sink for heat. They still use electricity to power the pump that moves the working fluid through the loops. They still use electricity for the blower that moves the air through the duct system. They’re still using even more electricity to run the compressor, which is the pump for the refrigeration cycle. All that electricity generally comes from outside the home, often from a power plant that burns coal or natural gas. The last I heard, most folks don’t consider those fuels renewable.Ah, but now that you mention Iceland, Allison, I hear you thinking, isn’t a ground-source heat pump doing the same thing they do when they pump heat from their numerous hot springs and use it in buildings? They’re using pumps to move the heat, too, just like a ground-source heat pump does? Well, yes and no. It appears at first to be the same thing, and we do indeed call the heat they’re using a “renewable” source of heat. The difference, though, is that they’re pumping high-grade heat that comes in at a temperature high enough to be used directly. They don’t have to “concentrate” it through the use of a refrigeration cycle as a ground-source heat pump does.I don’t use the term “geothermal heat pump.” It’s too confusing. Even Thomas Friedman, the columnist for the New York Times who’s written some well-received books about the environment, is confused about this. He wrote in a column a few years ago that he’s using renewable energy in his home because he installed a “geothermal” heat pump.Really now. If a ground-source heat pump is a renewable energy source, then so is a refrigerator. Can you see why this drives me crazy? Can a heat pump be classified as an energy source?OK, I’ll say a bit more. Remember that article I wrote about how your air conditioner works? And the one before that about how air-source heat pumps get heat out of cold air to heat your home in winter? A ground-source heat pump does exactly the same thing, with one difference. Are Affordable Ground-Source Heat Pumps On the Horizon?Ground-Source Heat Pumps (2010)Ground-Source Heat Pumps (2009)GBA Encyclopedia: Heat Pumps: The BasicsGBA Encyclopedia: Green Heating OptionsPodcast: Ground Source Heat Pumps, Part 1: The BasicsPodcast: Ground-Source Heat Pumps, Part 2: Rules of ThumbPodcast: Ground-Source Heat Pumps, Part 3: Five QuestionsHeating a Tight, Well-Insulated HouseGround-Source Heat Pumps Don’t Save EnergyGround-Source Heat Pumps Have Low Operating CostsAir-Source or Ground-Source Heat Pump? Here’s another rant that goes in my “drives me crazy” bin of articles. I’m in good company, too. Another article that ran at Green Building Advisor recently discussed making the choice between an air-source heat pump and a ground-source (a.k.a. “geothermal”) heat pump. At the end of the article, Peter Yost mentioned that ground-source heat pumps,“have been given quite the green ‘pass’ or ‘seal of approval’ because they are portrayed as using a ‘renewable’ energy source, and that makes me crazy.”So there’s your answer to the question I asked in the title: No! Ground-source heat pumps are not a renewable energy source. Let’s all go out and have a productive day now. RELATED ARTICLES In an air-source heat pump or air conditioner, you’re pulling heat from the outside air and putting it into the home (heating mode) or putting heat from the home into the outside air (cooling mode). The diagram below shows what’s going on. The heat exchange with the outside is going on in the part labeled as the condenser coil. In an air-source heat pump or air conditioner, that coil surrounds the noisy metal box that sits outside your home. The fan inside the condensing unit pulls outdoor air across that coil, and the refrigerant running through the coil either gives up heat to the outside (cooling mode) or picks up heat from the outside (heating mode).The only substantial difference with a ground-source heat pump is that you’re using the ground (or a body of water) instead of the outside air. The heat exchanger in a ground-source heat pump isn’t a coil but a loop of pipe carrying the working fluid. That loop of pipe can be horizontal or vertical (see the photo of a well, above), but its job is simply to exchange heat with the ground. It’s doing the job of the condenser coil above. (Actually, there are two closed loops and three heat exchanges going on, but I’ve taken the liberty of simplifying the process here, which doesn’t change anything regarding our original question.)I’ve focused on air conditioners and heat pumps here, but the same analysis applies to refrigerators, which are just another kind of heat pump that uses the refrigeration cycle. All of these need an input source of energy to run the refrigerant through the system. In an air-source heat pump, you also need a blower to move air across the evaporator coil and through the duct system and another fan in the condensing unit. In a ground-source heat pump, the fan in the condensing unit is replaced with a pump for the working fluid in the ground loop.So, is a refrigerator a renewable source of energy?last_img read more

22 days agoREVEALED: Eriksen DID give Tottenham teammate Vertonghen black eye

first_imgREVEALED: Eriksen DID give Tottenham teammate Vertonghen black eyeby Paul Vegas22 days agoSend to a friendShare the loveChristian Eriksen did manage to give Tottenham teammate Jan Vertonghen a black eye – but the incident was a training accident.Eriksen rubbished rumours circulating on social media that Vertonghen had been involved in an affair with his wife Sabrina Kvist Jensen. An image of Vertonghen with a black eye had accompanied some of the posts, suggesting it was related to the unfounded speculation.The Mirror says Eriksen was to blame for the injury in an accidental training-ground clash.Both Eriksen and Vertonghen were involved on Tuesday night as Spurs were humbled 7-2 by Bayern Munich.It was the first time in Tottenham’s history they had shipped seven goals on home soil and extended their indifferent start to the campaign. About the authorPaul VegasShare the loveHave your saylast_img read more

10 days agoJuventus coach Sarri planning London return for three-player raid

first_imgTagsTransfersAbout the authorPaul VegasShare the loveHave your say Juventus coach Sarri planning London return for three-player raidby Paul Vegas10 days agoSend to a friendShare the loveJuventus coach Maurizio Sarri is planning a London return for a three-player raid on Chelsea and Tottenham.Ilbianconero says Sarri is keen on poaching N’Golo Kante and Emerson Palmieri from old side Chelsea.And Le 10 Sport says Tottenham contract rebel Christian Eriksen has been lined up for a free transfer to Turin at the end of the season.It’s said that French World Cup winner Kante, 28, is high on Sarri’s shopping list after starring under the Italian last season.Sarri transformed Kante from a defensive midfielder into a complete all-rounder, and the pair could be set for a reunion at the end of the campaign.He is also keen on Chelsea teammate Emerson too, who he thrust into the side ahead of Marcos Alonso at the beginning of 2019.Eriksen, 27, is available on a free transfer next summer after refusing to talks terms with Tottenham.And Juve will look to open negotiations in January, despite reported interest from Real Madrid. last_img read more

Will carry forward Parrikars legacy of good governance Pramod Sawant

first_imgPanaji: Newly-appointed Goa Chief Minister Pramod Sawant Tuesday met family members of his deceased predecessor Manohar Parrikar before assuming charge of office, hours after he took oath of the post at around 2 AM. Sawant visited the family members of Parrikar at their private residence at Dona Paula near here around 12 noon, before heading to the CM’s Office at state Secretariat, Porvorim. Speaking to reporters, the new chief minister said his priority would be to reach out to every person, and carry forward the “glorious legacy” of good governance left behind by Parrikar. Sawant, a BJP MLA, was sworn in as new Chief Minister just before 2 am Tuesday, hours after cremation of Parrikar, as the BJP moved swiftly to snuff out Congress’ attempts to wrest power in Goa. Sawant, a protege of Parrikar, was Speaker of the Legislative Assembly when he was picked to be the successor of Parrikar. “Manohar Parrikar is a father-like figure for me. He was my inspiration…every thing. I am here only because of him…I became MLA, then Speaker, and nowCM only because of Parrikar,” Sawant told reporters after meeting kin of the late chief minister. When asked to list his priorities, Sawant said, “As a chief minister, my aim would be to reach out to every person and complete his works”. Sawant also appealed that he not be greeted with bouquets for being the new CM, as the state is in morning. “I have taken charge with great humility and gratitude towards my idol and mentor Manohar bhai (Parrikar). I seek your blessings and support to carry forward the glorious legacy of commitment towards good governance,” he said. In the wake of the fluid political situation in Goa and Congress’ repeated attempts to wrest power, the BJP leadership ensured that the new chief minister was in place quickly. Sawant was sworn in by governor Mridula Sinha at Raj Bhavan at 1.50 am. Sinha also administered the oath of office to 11 other ministers, including those from BJP’s allies MGP and the GFP. Parrikar died at his private residence Sunday evening due to pancreatic cancer. He was cremated with full state and military honours Monday evening.last_img read more

Morocco Wife of Former Minister Allegedly Buys a Hyena For Witchcraft

first_imgCasablanca- The world of witchcraft in Morocco never ceases to surprise us. A woman believed to be the wife of a former Moroccan minister was recently arrested while trying to buy a hyena, known for being used in witchcraft rituals. A woman said to be the wife of a former Moroccan minister was recently arrested in Dakhla, in southern Morocco, as she was negotiating the price of a hyena with a huntsman, according to daily Akhbar Al Yaoum. Accompanied by her housemaid, the woman met with a huntsman who was supposed to sell her a dead hyena for MAD 110,000. Police found the sum of money in the suspect’s car, according to the same source. The suspect was subsequently released after the police received a call said to be from high-ranking people, according to the same source. The housemaid and the huntsman were interrogated and then released. The hyena is sold in Morocco and other African countries for witchcraft rituals. Its price ranges between MAD 100,000 and MAD 160,000, and may cost more in some cases. Hyenas’ brain, called “Mokh dbaâ” in Moroccan Arabic, costs MAD 500 a gram in Morocco. Their brain is used in witchcraft rituals to presumably render people loveable and successful individuals in their society.Hyenas’ brain is only one among a plethora of other notorious witchcraft ingredients used in Morocco. Witchcraft practitioners in Morocco may sometimes request shocking things from their clients in exchange of their “supernatural services.” © Morocco World News. All Rights Reserved. This material may not be published, rewritten or redistributedlast_img read more

The NL Is Finally Winning Interleague Play — For Now

I don’t want to say it’s been a while since the National League broke even in interleague play, but here are some things that were true the last time it happened:George W. Bush was still in his first term as president.Barry Bonds was the best player in baseball.We were all excited about the idea of a sequel to “The Matrix.”Beyonce was just trying out the whole solo thing.Battle lines were drawn between Ruben Studdard and Clay Aiken supporters.You get the idea. Between 2003 and this season, AL teams compiled a 1,765-1,465 record1Including the World Series. against their NL counterparts — good for a .546 winning percentage, or roughly 89 wins per 162 games — and won interleague play by a grand total of 1,688 runs. It’s a run of complete dominance that has covered more than half the history of regular-season interleague play (which began in 1997).At a team-by-team level, the difference between leagues has been downright comical at times. In 2009, at the peak of the AL-NL disparity, the AL’s 75-win Toronto Blue Jays had a better schedule-adjusted run differential2As measured by Baseball-Reference’s Simple Rating System, or SRS. than the NL’s 93-win Philadelphia Phillies. Last season, the 98-win Pittsburgh Pirates were dead-even with the 78-win Boston Red Sox. Talent being equal, being in the NL over the past decade-plus has consistently been worth a number of extra wins each season.But so far this year, the NL has done uncharacteristically well against the Junior Circuit, posting a 25-18 record in interleague play as of Monday night’s games. If it holds up, that .581 winning percentage would represent the NL’s best-ever performance against the AL, shattering the old mark of .548 set in interleague’s debut season. That’s why Elo’s predictions say the AL should actually be ahead on wins, 22-21, against the NL right now. And since ‘97, that Elo-generated expectation has been a better predictor of interleague play over the rest of the season than each league’s actual record through 43 games.In other words, the NL shouldn’t start celebrating quite yet. Even though it’s off to a strong start against its cross-league rival, there’s still plenty of time left for the AL to mash it into paste, as usual. However, we’ve seen this kind of fast start from the NL before. In 2014, NL teams won 26 of the first 43 interleague matchups, a game better than even this season’s fast start, only to go 115-149 over the rest of the season and finish the year with a lousy .459 winning percentage. That was one of four instances during the NL’s 12-year run of futility that the Senior Circuit was above .500 through 43 interleague games; it finished those seasons with an average winning percentage of .453.And there are signs that this season could be destined for more of the same. Although the NL is home to a handful of the best teams in MLB — the mighty Cubs, plus the Mets, Nationals, Dodgers, Cardinals, Pirates and Giants, all of whom rank among FanGraphs’ top 11 teams by projected wins above replacement going forward — it also houses each of the seven worst teams in baseball by projected WAR.3For those curious, that’s the Diamondbacks, Rockies, Padres, Brewers, Reds, Phillies and Braves. So despite the NL’s top-heaviness, our team Elo ratings (which estimate a team’s strength at any given moment) consider the gap between the average AL and NL teams to be bigger now than it usually is after 43 interleague games.4Granted, MLB used to start the interleague schedule later in the season; before 2013, it would be mid-June before 43 games were played. But since Elo ratings are theoretically time-independent (hence the “strength at any given moment” part above), that difference shouldn’t be affecting the results. read more

Baseball Leaving pitching behind Murray hopes to impact 2017 Buckeyes with change

OSU redshirt senior Shea Murray is switching positions from pitcher to outfield for the 2017 season. Credit: Courtesy of OSUChanging positions in baseball is often just part of the game. But it is rare a position change occurs in a player’s final year of eligibility. It is even more rare still that the change is from the mound to the outfield.But that is the transition coming for redshirt senior outfielder Shea Murray ahead of the 2017 season. The former pitcher will be taking his talents to the outfield where he hopes to compete for a starting spot in his final season with the Ohio State baseball team.The decision to make such a drastic position change came toward the end of the 2016 season. The coaching staff sat down with Murray and discussed a way for the 23-year-old player to have an impact on the team after three years of limited playing time.“My mechanics were not great — I couldn’t locate the ball like I at one time could and basically coming into my fifth year, I just wanted to have an opportunity to get on the field any way that I could,” Murray said. “And we lost a lot of the lineup from last year: two of the outfielders (Ronnie Dawson and Troy Montgomery) and a lot of the hitters. I felt like if there was any opportunity to make that transition, it was this year.”The decision to join OSU as a pitcher initially was not his alone. After graduating from Defiance High School, Murray spoke with baseball coach Tom Held who recommended he try to walk on as a pitcher due to his size and projectability.“He’s just a guy who’s got a lot of God-given ability, that I always knew if we convinced him that he could throw 90 miles per hour as a pitcher, he could walk on,” Held said. “I said, ‘you throw 90 at 6-foot-5 the way you are, they’ll keep you as a walk-on and that’s what he did.”Held – who has sent four pitchers to professional baseball, including Jon Niese and Chad Billingsley, as well as five pitchers to Division I college baseball – believed if there was ever a player who could make this transition, it was Murray.“We have a little idea to compare Shea with all those guys,” Held said. “Shea’s more athletic than any of them. That doesn’t mean he’s a better pitcher, but he’s more athletic.”Murray opted to redshirt his true-freshman season. That year he appeared in five games with little success, posting a 30.38 ERA across 2.2 innings. The following year, he made six appearances, but again failed to find much success as he produced a 7.04 ERA in 7.2 innings of work.Despite the struggles, Murray attracted big-league attention. After the 2015 season, Murray was drafted by the Texas Rangers when they selected him in the 39th round of the draft, 1158th overall.Some might find it strange to draft someone with only 10.1 innings of collegiate experience, but former Chicago Cubs scout and Cincinnati Reds’ interim general manager Brad Kullman said that is a typical pick for teams late in drafts given the upside that comes with Murray’s profile.“There is an old saying in baseball that you can teach a kid off-speed pitches, and you can work with his mechanics (to improve control), but can’t teach arm strength,” Kullman said. “The Rangers scout must have had a theory that they could work with his mechanics and try to harness his power. If he truly has not just a good arm, but two-plus pitches for a 39th rounder, it’s not an unreasonable gamble to try to catch lightning in a bottle.”Despite the offer to play professionally, Murray opted to return to OSU to prove to himself he could improve his value and still contribute to the team’s success.“I felt I could up my draft stock coming back and playing for another year,” Murray said. “I felt like I had unfinished business here at Ohio State, that was before we had won the Big Ten Championship. That was before I really had very much playing time and also, I hadn’t finished my degree yet, so it was a combination of things that was why I wanted to come back.”The 2016 campaign yielded better results for Murray as he logged 2.0 innings in two appearances and a 0.00 ERA with four strikeouts. The season also saw him log an inning in center field and register his first at-bat as a college player.After the season ended, OSU baseball coach Greg Beals saw practice in the outfield as a chance for Murray to reset his mechanics and get back to basics. But Beals was impressed enough by what he saw in Murray’s defensive ability and potential offensive upside that he now believes Murray might have a chance to stick in the outfield as a starter this season.“Shea’s a great athlete, I mean (he) can really run and throw; he’s a big, physical kid with great tools to play outfield defense,” Beals said. “He’s taken to playing the outfield extremely well and we’ve left him in that position, because we think he’s got a significant opportunity to contribute to our ball club this year.”For Murray, this transition has required spending many hours in the batting cages and shagging fly balls out in the field. His summer was spent improving his swing and defensive ability in the field with coach Beals and former MLB outfielder Matt Angle.Held believes Murray’s dedication to the baseball following a high-school career as a three-sport athlete has helped him make this transition by providing him with confidence in his ability and a strong work ethic.“He went to work that day (he made the position change) and has continued to put himself in a position maybe to put himself on the field and I couldn’t be more proud of him,” Held said. “Most guys wouldn’t do that. They wouldn’t even take on that challenge.” read more

Liverpool confirm Naby Keita hospital stay

first_imgLiverpool midfielder Naby Keita will remain in hospital after sustaining a back injury in their 1-0 defeat to NapoliKeita had started in the Champions League game at the Stadio San Paolo, but was taken off on a stretcher after just 19 minutes.The former RB Leipzig man complained of being in “severe pain” with Liverpool now confirming that he remains in a Naples hospital until further notice.“Liverpool Football Club can confirm Naby Keita was taken to hospital in Naples on Wednesday evening during the first half of the Champions League fixture with SSC Napoli,” read a statement.Roberto Firmino, LiverpoolVirgil van Dijk praises Roberto Firmino after Liverpool’s win Andrew Smyth – September 14, 2019 Virgil van Dijk hailed team-mate Roberto Firmino after coming off the bench to inspire Liverpool to a 3-1 comeback win against Newcastle United.“The midfielder started the game at the Stadio San Paolo, but was substituted inside the opening 20 minutes and replaced by Jordan Henderson after alerting the team’s medical staff to back pain.“Keita was transferred to a local hospital with the club doctor, where – with the midfielder’s agreement – he underwent a number of precautionary health checks to assess his condition. No decision has yet been taken on when the 23-year-old will be discharged.”Liverpool lost on the night due to a late winner from Napoli forward Lorenzo Insigne and are now second in Group C behind their Italian opponents.last_img read more

Lukaku reveals Manchester United players are together

first_imgRomelu Lukaku has revealed Manchester United players are a strong group irrespective of the club’s turbulent form.The Red Devils came from 2-0 down to beat the Magpies 3-2 which prevented another shocking result at the club and reduced the intense scrutiny on manager Jose Mourinho.But Lukaku told Sky: “Our team is great, we do a lot of stuff together. We always are a really tight group.“Every time there is a new player coming in we try and make him feel comfortable, and that’s the key. The dressing room has always been good, and that’s always been the case at Manchester United, and we did what we had to do.Romelu Lukaku, Serie A, Inter MilanCapello calls Lukaku “a modern striker” Manuel R. Medina – September 14, 2019 The former Italian manager believes Romelu Lukaku is perfectly suited for Antonio Conte’s Internazionale Milan in the Serie A.“We won the game, and we have to be positive and look forward to the next games. I’m a really bad loser, so coming into the game, I really was anxious, because I wanted to win.“Thank God we won the game today and now the important thing with the international break is that nobody gets injured. When we come back, we have two important games where, if we have good results, we can move forward.”United will play the likes of Chelsea and Juventus after the International break in what has been a tough start to the campaign.last_img read more