Heating with a Minisplit Heat Pump

first_imgThirty-five years ago, when I first got involved with energy efficiency and renewable energy, the mere suggestion that one might heat with electricity would be scoffed at by those of us seeking alternatives to fossil fuels.Amory Lovins, founder of the Rocky Mountain Institute, likened using electricity for heating to “cutting butter with a chainsaw.” Electricity is a high-grade form of energy; it doesn’t make sense to use it for a low-grade need like heating, he argued. It made much more sense, we all agreed, to produce that 75-degree warmth with solar collectors or passive-solar design.So, it’s a big surprise that I’m now arguing that electricity can be the smartest way to heat a house. And that’s what we’re doing in the farmhouse we’re rebuilding in Dummerston. I should note, here, that all of our electricity is being supplied by a solar array on our barn. Our Mitsubishi heat pumpWe installed a state-of-the-art Mitsubishi M-Series FE18NA heat pump that is rated at 21,600 Btu/hour for heating and 18,000 Btu/hour (1 1/2 tons) for cooling. Marc Rosenbaum, P.E. ran heat load calculations showing peak heating demand (assuming –5°F outside temperature) about 23,000 Btu/hour, assuming the air leakage we measured several months ago, before the house envelope was completed. If the air leakage ends up being cut in half from that measured level, the design heat load would drop to a little over 19,000 Btu/hour.We think the FE18NA model will work fine for nearly all conditions, but we are also installing a small wood stove — the smallest model made by Jøtul — for use on exceptionally cold nights.The indoor unit of our heat pump is about 43 inches long by 13 inches tall by 9 3/8 inches deep. It is installed high on a wall extending in from the west wall of the house, next to an open stairway to the second floor; it is controlled with a hand-held remote. The outdoor unit, installed just off a screen porch on the west side of the house, is 35 inches tall by 33 inches wide by 13 inches deep. It is located under an overhang and held off the ground by granite blocking.ARC Mechanical from Keene, New Hampshire, did a great job with installation, and the system has now been turned on. We won’t move in until December, but it’s nice to know we have heat. Point-source heating and coolingDuctless minisplit heat pumps are ideally suited for compact, highly energy-efficient homes. Our house has R-values greater than R-40 in the walls and R-50 in the roof, plus very tight construction. We also have a heat-recovery ventilator (HRV) for fresh air. In tight, superinsulated homes, a single space heater (point-source heating system) can work very well, because with all the insulation fairly uniform temperatures are maintained throughout the house.With our 1,700 square-foot house, the two upstairs bedrooms may stay a little cooler than the downstairs, but we like a cooler bedroom. In a larger house or one that isn’t as well insulated, several ductless minisplit heat pumps or a ducted heat pump option might be required. Alex is founder of BuildingGreen, Inc. and executive editor of Environmental Building News. In 2012 he founded the Resilient Design Institute. To keep up with Alex’s latest articles and musings, you can sign up for his Twitter feed. Installing a Ductless Minisplit SystemHeating a Tight, Well-Insulated House Will Minisplits Replace Forced-Air Heating and Cooling Systems?Air-Source or Ground-Source Heat Pump?Product Guide: Mitsubishi Mr. Slim Ductless MinisplitGBA Encyclopedia: Ductless Minisplit Heat Pumps Heat pump basicsHeating with electricity makes sense if instead of using that electricity directly to produce heat — through electric-resistance strip heaters — we use a device called a heat pump. For every one unit of energy consumed (as electricity), two to three units of energy (as heat) are delivered. This makes heat pumps significantly less expensive to operate than oil or propane heating systems in terms of dollars per delivered unit of heat. RELATED ARTICLES Heat pumps use electricity in a seemingly magic way, to move heat from one place to another and upgrade the temperature of that heat in the process. Heat pumps seem like magic because they can extract heat from a place that’s cold — like Vermont’s outdoor air in January, or underground — and deliver it to a place that’s a lot warmer.Very significantly, heat pumps can be switched from heating mode to cooling mode with a flip of a switch. In the cooling mode, they work just like a standard air conditioner.Ground-source or geothermal heat pumps rely on the ground (or groundwater) as the heat source in the heating mode (and as the heat sink for cooling), while air-source heat pumps use the outside air as the heat source and heat sink. Because temperatures underground are much warmer than the outside air in winter, the efficiency of ground-source heat pumps is typically higher than that of air-source heat pumps.But ground-source heat pumps are really expensive. Friends in southern Vermont have spent $35,000 — or even more — to install residential-sized ground-source heat pumps. The cost is so high because of the cost of trenching or drilling wells.By contrast, air-source heat pumps are much simpler and far less expensive. The most common types today — and what we installed at Leonard Farm — are referred to as ductless minisplit heat pumps. There is an outdoor compressor (a box about 3 feet on a side and 1 foot deep), an indoor unit (evaporator with blower) that mounts on an interior wall, and copper tubing that carries refrigerant between the two.The typical installed cost of a ductless minisplit system is $3,000 to $5,000, though many variables affect the cost.These air-source heat pumps are viable today, even in cold climates, because of dramatic improvements in the past few decades. Much of this innovation has been driven by Japanese companies, including Mitsubishi, Daikin, Fujitsu, and Sanyo (now part of Panasonic).Several decades ago, air-source heat pumps only made sense in climates that rarely dropped below 30°F in the winter; today some of these systems, including ours, will function well at temperatures below zero degrees F.last_img read more

Book it: Devin Booker hits 28 to win 3-point contest

first_imgView comments Nets’ Dinwiddie wins skills challenge John Lloyd Cruz a dashing guest at Vhong Navarro’s wedding NEXT BLOCK ASIA 2.0 introduces GURUS AWARDS to recognize and reward industry influencers Trending Articles PLAY LIST 00:50Trending Articles01:19Fire erupts in Barangay Tatalon in Quezon City00:50Trending Articles01:29Police teams find crossbows, bows in HK university01:35Panelo suggests discounted SEA Games tickets for students02:49Robredo: True leaders perform well despite having ‘uninspiring’ boss02:42PH underwater hockey team aims to make waves in SEA Games01:44Philippines marks anniversary of massacre with calls for justice Booker, the 21-year-old sharpshooter in his third season with Phoenix, is averaging 24.2 points per game this season as the NBA’s 12th-leading scorer. Eleven months after the shooting guard dropped 70 points against Boston to become the youngest player in NBA history to score even 60 in a game, Booker added another accolade to his promising career with the 3-Point title.Thompson beat the buzzer with his final shot of the first round to reach the finals with 19 points. Booker also scored 19 and Harris had 18. LOS ANGELES, CA – FEBRUARY 17: Devin Booker accepts the trophy for the 2018 JBL Three-Point Contest at Staples Center on February 17, 2018 in Los Angeles, California. Kevork Djansezian/Getty Images/AFPDevin Booker of the Phoenix Suns won the 3-point contest with a record 28 points in the final round. He beat 2016 champion Klay Thompson of the Golden State Warriors and Tobias Harris of the Los Angeles Clippers.“It feels really good,” Booker said. “I wanted to go out there and make a name for myself.”ADVERTISEMENT Globe Business launches leading cloud-enabled and hardware-agnostic conferencing platform in PH Slow and steady hope for near-extinct Bangladesh tortoises Did he ever. He was sensational in the final round on Saturday, when he missed only five of 25 shots.Each player shot five five-ball racks with a one-minute time limit. The final ball of each one was a “money ball” worth two points, and one of the racks, usually the last one, was all money balls. Booker made the money ball shot on his first four racks, and then made four of the five balls on the money ball rack.FEATURED STORIESSPORTSWATCH: Drones light up sky in final leg of SEA Games torch runSPORTSLillard, Anthony lead Blazers over ThunderSPORTSMalditas save PH from shutoutHarris, Booker and Thompson advanced from the eight-man field to the finals. Harris scored 17 points before Booker scorched the nets for 28 points. Thompson followed and scored 25 points.The previous record was 27 points, set by Stephen Curry in 2015 and matched by Thompson the following year.center_img Read Next LATEST STORIES Typhoon Kammuri accelerates, gains strength en route to PH Brace for potentially devastating typhoon approaching PH – NDRRMC Don’t miss out on the latest news and information. AFP official booed out of forum MOST READ 2 ‘newbie’ drug pushers fall in Lucena stinglast_img read more

TFA Reaffirms Commitment to Inclusion and Deaf Sports Australia (DSA)

first_imgDate:  22 and 23 AugustLocation: DarwinVenue: Darwin High SchoolTime:  22/8 – 10am – 12.00pm23/8 – 8:00am – 9:30am. ACTNT Hearing impairments currently affect one in five Australians with that number expected to increase in coming years.The commitment by TFA to those who may describe themselves as deaf, hard of hearing, hearing impaired or a cochlear implantee, is another example of how the sport aims to improve the inclusiveness and experience for participants in the sport. As well as creating an environment where persons with a hearing impairment feel comfortable participating and be a part of the Touch Football community.Against this backdrop, Touch Football Australia (TFA) also announced this week the re-signing of a Memorandum of Understanding (MOU) with Deaf Sports Australia (DSA).The purpose of the MOU is to increase the number of participants who are deaf or hard of hearing in Touch Football, through: community based initiatives; the creation of specific material for hearing impaired persons; as well as the identification of development pathways in Touch Football.For further information, please visit www.touchfootball.com.au or www.deafsports.org.au.Head down to the above venues and witness first-hand something you don’t see every-day: a completely silent Touch Football match with all participants wearing ear muffs and no verbal communication allowed. Date: 24 August, 2017Location: CanberraVenue: Reconciliation Park, Parkes ACTTime: 12.00am – 2.00pm TFA is again proud to support Hearing Awareness Week with a focus on the fragility of hearing health and ways to protect it. Hearing Awareness Week (20-26 August) aims to eliminate the stigma, isolation, lack of work opportunities, and the associated health issues to improve the overall quality of life for people with deafness or hearing impairment.The first community initiative for TFA and Deaf Sports Australia in 2017 is the annual Silent Sports Challenge. The event this year will be held across two key locations, Canberra and Darwin; both centres will host Touch Football events to raise awareness of inclusion and encourage a place on the touch football field for everyone, as follows.last_img read more

a month agoAtletico Madrid coach Simeone: Juventus draw more than deserved

first_imgAbout the authorPaul VegasShare the loveHave your say Atletico Madrid coach Simeone: Juventus draw more than deservedby Paul Vegasa month agoSend to a friendShare the loveAtletico Madrid coach Diego Simeone insists they deserve their point with Juventus.This Champions League clash finished 2-2, after the Bianconeri were 2-0 up with Juan Cuadrado and Blaise Matuidi goals, but Atleti fought back with two headers from set plays courtesy of Stefan Savic and Hector Herrera.“We were missing something in the first half and Juve stepped up after the break, but I liked the fact we never gave in and fought back for a result,” said Cholo.“We always tried to create situations where we could hurt Juve. Jose Maria Gimenez went close, as did Vitolo and Angel Correa, so it was a more than deserved point.“I don’t see this draw as a good or bad result. Juve are very strong opponents with a lot of experience and an average age of 29 compared to our 24. Experience helps at this level and that is why matches like this can help us mature for what awaits in future.“The important thing is not to lose intensity during the game and to maintain faith in our characteristics.” last_img read more

Video: Colin Cowherd Brings The Doom And Gloom As He Breaks Down Wisconsin’s 2016 Schedule

first_imgColin Cowherd goes through Wisconsin's football schedule.YouTube/Colin CowherdOn his show, FOX Sports 1’s Colin Cowherd has been going through the schedules of major college football programs and giving his early projections for the upcoming season. He likes Michigan and USC this fall, but when it comes to the Wisconsin Badgers, his breakdown is not nearly as encouraging.Cowherd’s four biggest factors that play into his prediction are:1. The loss of defensive coordinator Dave Aranda to LSU.2. The graduation of Joel Stave.3. Wisconsin’s schedule: “the toughest schedule I think I’ve seen in the Big Ten in years.”4. The defense is strong in the back, a bit weaker up front.Here is Cowherd’s full breakdown: That is a 6-6 season, with wins over Akron, Georgia State, Nebraska, Illinois, Purdue, and Minnesota, and losses to Alabama, Michigan State, Michigan, Ohio State, Iowa, and Northwestern. He’s not wrong about the schedule; the Badgers play the four best teams from the 2015 Big Ten season in a row from September 24 to October 22. Yikes.last_img read more