With summer underway, the feeling of warm sunshine and the lure of the cool lakeside can lull you into thinking nothing can go wrong. But making poor health choices happens more easily than you’d expect this time of year. Avoid them by following these tips:
Don’t forget to screen up.Sunscreen can seem like a precaution for kids, and the Coppertone baby certainly doesn’t help with that image. But a little precaution goes a long way. It takes less sun exposure than you expect to start working on that killer sunburn you’ll be nursing for the next two weeks. Why not save yourself the hassle with a quick application of sunscreen? Not to mention the long-term benefits of protecting yourself from the harms of sun exposure, like melanoma.
Stay hydrated. Did you know that by the time you feel thirsty, you’re already dehydrated? That’s why it’s important to make sure you get enough liquids in the summer heat. Water is best, but you can also boost your hydration with fruit like watermelon. Be sure to get plenty of shade and take breaks when exercising outdoors.
Be careful what trends you follow.The summer can feel like a good time to take up new hobbies and try out new things, but you should leave some of them on the shelf. Picking up smoking is not a healthy choice; vaping isn’t a smart choice for non-smokers either. Vaping still exposes you to harmful chemicals, and often still delivers nicotine, which is addictive. Keep your summer skies clear, and leave the tobacco and vaping products behind. If you are a smoker and are not ready to quit nicotine, completely replacing cigarette smoking with vaping will reduce your exposure to harmful chemicals.
Please be advised that the Save on Energy Heating and Cooling Incentive Program is cancelled as of April 1, 2019. The Heating and Cooling Incentive program is being discontinued pursuant to a directive received from the Minister of Energy, Northern Development and Mines, directing the IESO to discontinue the Conservation First Framework. Projects that have already been completed and submitted for payment will be processed according to the Participant Terms and Conditions. Participating Contractors have until May 31, 2019 to submit incentive applications for projects with an installation date of no later than April 30, 2019. No new claim submissions will be accepted after May 31, 2019. Participants should submit proof of purchase and sign-off on the application submitted by their Participating Contractor before July 1, 2019.
April 30, 2019: Deadline for Participating Contractors to complete installations
May 31, 2019: Deadline for Participating Contractors to submit incentive applications to OSS
June 30, 2019: Deadline for Participants to submit proof of purchase and sign-off on applications
Over the past year, aluminum and steel tariffs, the China-US trade war and Huawei tussle, Brexit, the uncertainty of NAFTA 2.0 ratification by the US Senate, and generally increasing global protectionism have created some anxiety for business executives.
PLANT Magazine’s annual Manufacturers’ Outlook survey for 2019, conducted in partnership with Grant Thornton LLP, SYSPRO Canadaand the Italian Trade Commissionshows concerns are rising. This survey has been conducted for many years, with year-to-year comparisons showing relative changes in business confidence.
This year’s surveyconclusions are based on 501 replies from senior manufacturing executives. About 39% are ‘very optimistic’ about the coming year, and a majority think their sales orders and revenues will both increase. However, this number represents a notable decrease from 44% in 2018. Further, fully 65% of executives said US protectionism is ‘very worrying,’ compared with 54% taking this view one year ago.
The aluminum and steel tariffs were expected to be lifted once NAFTA 2.0 was signed, but the US senate has not yet ratified it, and there are reports of opposition from both Democrat and Republican Senators. At the same time the World Trade Organization (WTO) is investigating whether the initial U.S. tariffs and the retaliatory tariffs imposed by Canada and other countries broke the rules. Some reports have suggested that actual tariff impact has not been felt much as yet but, according to the Conference Board of Canada,85 per centof Canada’s steel and aluminum exports are destined for the United States, and are valued at about $24 billion.
There are also worrying developments with other key Canadian partners. Trade disputes between the US and China have been complicated by Canada agreeing to arrest and extradite to the US Huawei company leader Meng Wanzhou. China has threatened Canada with ‘consequences,’ which, if implemented, could be damaging. In 2010 China banned salmon fromNorwayafter it awarded the Nobel Peace Prize to Chinese human rights activist Liu Xiaobo.
Brexit is also creating uncertainty. The UK is Canada's third largest export goods market and second-largest services export market. If the economy in the UK weakens, itcould affectCanada economically. Canada has signed the CETA trade agreement with Europe, and like NAFTA 2.0, it has not yet been ratified by European parliaments.
Despite all the doom and gloom, the PLANT Magazine survey found executives were generally thinking positively about prospects for the coming year, with 55 percent expecting sales to increase by about 12 percent on average, and about one-third expecting profit increases of about 11 percent.
Finned tube coils are meant to have contact with the air flow, as more contact creates more heat transfer. Heat transfer is nothing more than heat exchanged from one medium to another, and the goal is to create maximum heat transfer efficiency. The downside to this process is the coil’s susceptibility to foreign materials becoming lodged in them. The following explores this problem in a little more depth.
Tubes in a coil are the “primary surface”, and the fins are the “secondary surface”. In a heating coil, the water or steam is hotter than the air going across the outside finned-tube surface. The heat is removed from the fluid and transferred to the air. In a cooling coil, the water or refrigerant is cooler than the air, and the heat from the air is transferred to the water or refrigerant. All of this can be calculated by our computer coil selection programs. However, these programs are BTUH capacity based on a clean coil. The term “clean coil” means no internal or external fouling. It’s like the miles per gallon you see on a new car sticker that represents a perfect test versus the results you get with normal driving. The same goes for coils.
Finned Tube Fouling
As stated, the finned tube design is meant to have maximum contact with the air. Because of this, internal portions of a coil core can begin to “load up” from dirt and debris. Most times, it’s because the upstream filters have not been changed or are inadequate for the system. Many systems still have the old type furnace filter which is equal to a MERV 6 rating. Even MERV 8 filters are not adequate for most HVAC systems. They do not remove enough particulate, especially when they’re not replaced on a regular basis. This will “load up” the downstream coil.
When a downstream coil is loaded, the air resistance is increased. The system was sized for an internal unit resistance, and one of the main resistances in an air handler is the coils. The air flow amount can fall as much as 15% to 25% based on this fouling. Many operators see this decrease and speed up the fan to overcome the added resistance. This only adds to the operating cost of the unit, as the brake horsepower and overall power consumption will increase substantially.
The coil also has more “insulation” between the fluid inside the tubes and the air outside the tubes. The dirt will act as an insulating pad between the two streams, and you can lose 10% of your heat transfer due to this factor. The dirt buildup isn’t always uniform across the entire face of the coil. We’ve seen water carryover in cooling coils, because a local velocity through a more opened area of the coil rises above the velocity where carryover can occur.
Tube Side Fouling
The inside header and tube surface of most coils installed in today’s HVAC systems are not cleanable. Many systems are not pure water, steam, or refrigerant; and the inside surface can cause performance problems. This is usually unknown, as you can’t see inside a coil unless you disconnect the coil connections. It may still be difficult, as you will only be able to see a few inches into the coil.
Water (glycol) and steam are both treated. Sometimes there is also a lack of treatment that is every bit as bad. With these treatments, the fluids can begin to have clogging affects with the inside tube surface. Condensate especially can almost close tubes after a long time in service. It’s important to understand that the internal fouling acts as an insulator between the fluid inside the tubes and the air outside the tubes. The capacity can be severely reduced.