Why does a desert cooler cool better on a hot dry day

Hint: Try to figure out the phenomenon of a desert cooler. Compare how it works on a hot and cold day with low humid conditions and high humid conditions. Complete step by step answer: We know that a hot day has high temperature and the dry day has low or no humidity. On a hot dry day, water vapor will be less and the temperature will be high. As a result, water will readily evaporate on the supply of the little amount of heat. Evaporation is a cooling process that cools the surroundings. Desert coolers transfer the heat energy from circulating air to water. Water evaporates resulting in the cooling of the surrounding air and this air is circulated. On a hot dry day, the humidity will be low and the temperature will be high. The temperature of the air will be relatively higher and energy transferred will be more. Since the same volume of air will be circulated energy transferred per given volume of air will be more on a hot day. Evaporation will be faster resulting in better cooling. On a dry day, water vapor present in the air will be less, and the circulation of this air will provide faster cooling compared to a humid day. Humid air contains more water vapor content so energy transferred will be less and the rate of cooling will be less. Therefore desert cooler cools better on a hot dry day. Note: We may think humid air which has a lot of water vapor which contains more energy and can transfer a lot of energy but heat cannot be absorbed from water vapor resulting in the ...

On a hot, sunny day, long sleeves get a bad wrap. In fact, when it’s hot out, a wearer in long sleeves will endure laughter and ridicule on the golf course and the endless question, “Aren’t you hot in that?” Here’s the good news, if you wear UPF 50+ long sleeves when the rays are pummeling you, you no longer have to contend with those who simply don’t know the secret advantage of long sleeves. The fact is that when the sun is shining and temperatures rise, A number of years ago, an inquisitive research team led by C Richard Taylor and Virginia Finch of Why Do Bedouins Wear Black Robes in Hot Deserts?, measured the people’s overall heat gain and loss in the robes, considering their amount of coverage, long sleeves and the color of their robes. A volunteer wearing different levels of coverage and different colored clothing was faced into the midday sun in the desert for 30 minutes. Withstanding 95F, the volunteer placed in the Negev desert at the bottom of the rift valley between the Dead Sea and the Gulf of Eilat wore either: 1) a black Bedouin robe; 2) a similar robe that was white; 3) a tan army uniform; or 4) shorts (that is, he was semi‑nude). The results were surprising, but not surprising. Long sleeves and more clothing kept the wearer cooler. As the report puts it: “The amount of heat gained by a Bedouin exposed to the hot desert is the same whether he wears a black or a white robe. The additional heat absorbed by the black robe was lost before it reached the skin.” ...

Anjali Prasertong is a writer and public health dietitian focused on food systems, racial equity, and nutrition. Originally from Los Angeles, she has taught English in rural Japan, worked as a private chef in Malibu, and led an innovative city-funded corner store program in New Orleans that increased fresh food access in low-income neighborhoods. She was previously a contributing editor for The Kitchn, and currently lives in Denver with her husband and two kids. As you might imagine, consuming a hot drink does add heat to your body, but that heat actually increases the rate at which you sweat, which can help cool you off. The scientists who conducted the study believe that thermosensors lining the throat and mouth might be what triggers the sweating response. Of course, the sweat has to evaporate in order for you to feel cooler, so if you are wearing heavy clothing or live in a very humid climate, drinking a hot beverage won’t help much. But on a hot, dry day when you’re wearing shorts and a t-shirt, hot coffee might actually cool you off more than a glass of ice-cold coffee.

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We've tested over 40 coolers since 2016 in search of the best, most well insulated models. This review covers 18 of the top ice chests available today. We started in the lab with rigorous insulation testing and continued assessments through a wide range of real-world uses. From picnics in the park to beach BBQs, we carted these models everywhere we went to learn which models were most portable and enjoyable to use. We also went through hundreds of pounds of ice and frosty cans in our rigorous insulation tests. Whether you're setting out on a road trip or a hunting trip, we can help you choose your perfect icebox. For a more packable cooler, check out our comparison of the Editor's Note: This cooler review was updated on May 12, 2023, to retest old favorites and include new award winners. 69 Star Rating • 1 • 2 • 3 • 4 • 5 • 1 • 2 • 3 • 4 • 5 • 1 • 2 • 3 • 4 • 5 • 1 • 2 • 3 • 4 • 5 • 1 • 2 • 3 • 4 • 5 Pros Excellent insulation performance, very durable, useful features Excellent insulation, super durable, easy to use, great size Lightweight, easy to use, great features Excellent insulation, great drainage, durable, compact design Very durable, good insulation, comfortable handle grips Cons Heavy, difficult to transport solo Expensive, no leash for plug, smaller than claimed Flimsy latches and hinges, leaky lid Tall narrow shape is hard to dig through, expensive, not our favorite handles A bit large for one person, no leash for plug, latches are scarily stretchy Bottom Line ...

On This Page • • • • • • • • What Is an Evaporative Cooler? An evaporative cooler uses an electric-powered fan to draw hot, dry air through a dampened pad and How do evaporative coolers work? Jenschke explains evaporative coolers utilize evaporation to Evaporative coolers are made up of four essential parts: a fan, a water tank, filter pads (sometimes called media) and an internal motor. The motor pulls warm air through a wet internal filter pad, where the evaporation process quickly lowers its temperature before it is circulated back into the room. The internal pads also act as a filter, removing dust and allergens from the air. “Evaporative coolers work best in arid climates, where you can see as much as a 30 degree reduction in temperature,” says Jenschke. “In less arid climates, they’re not as effective, but can still cool the surrounding air by five to 15 degrees.” Jenschke also recommends opening nearby windows to help renew the air and keep the breeze fresh. How Is an Evaporative Cooler Different From an A/C Unit? Evaporative coolers and A/C units work with different technologies. “Air conditioners use chemical refrigerants in tubes and coils to remove hot air from your home and leave behind drier, cooler air,” Jenschke says. “In many situations, an air conditioner is connected to the outdoors because the tubes and coils absorb heat from indoors and release it outdoors. You can feel warm air coming from an air conditioner outside for this reason.” Evaporative cooler...

Here in Washington, we finally got a slight break from what is shaping up to be one of the hottest summers in recent memory for We got in touch with Their answer, in short: Yes, a hot drink can cool you down, but only in specific circumstances. “If you drink a hot drink, it does result in a lower amount of heat stored inside your body, provided the additional sweat that’s produced when you drink the hot drink can evaporate,” Jay says. How does this work? “What we found is that when you ingest a hot drink, you actually have a disproportionate increase in the amount that you sweat,” Jay says. “Yes, the hot drink is hotter than your body temperature, so you are adding heat to the body, but the amount that you increase your sweating by—if that can all evaporate—more than compensates for the the added heat to the body from the fluid.” The increased rate of perspiration is the key. Although sweat may seem like a nuisance, the body perspires for a very good reason. When sweat evaporates from the skin, energy is absorbed into the air as part of the reaction, thereby cooling the body. A larger amount of sweat means more cooling, which more than counteracts the small amount of heat contained in a hot beverage relative to the entire body. The caveat, though, is that all that extra sweat produced as a result of the hot drink actually has to evaporate for it to have a cooling effect. “On a very hot and humid day, if you’re wearing a lot of clothing, or if you’re having so much sweat th...

A swamp cooler — the affectionate name for an evaporative cooler — can save you a bundle of money on your electricity bills when temperatures skyrocket during the hot summer months. Unlike an air conditioner, which relies on near-constant electrical energy to swamp cooler uses only the natural process of evaporation to make your home’s air colder. When an evaporative cooler does use electricity, it’s only to run a fan that pushes cool air into your room. If you’re excited by the energy savings and sustainability that evaporative cooling provides, great! The trick to getting the most out of your evaporative cooler is to know how to use it. These systems don’t operate like regular air conditioning, so it pays to learn a few swamp cooler  tips and tricks to make it work at peak efficiency. Here’s what you need to know. The biggest mistake people make with their evaporative cooler is trying to use it on humid days. This will never work. The whole point of an evaporative cooler is to bring down the temperature by allowing a fresh water supply to dissipate into dry air. water evaporates, it naturally lowers the temperature in that area, and this cold air is then blown where you need it by the system’s fan. This process is the same as sweating: damp skin cools in dry air, making your body cooler in the process. If you’ve ever noticed how miserable you are on a humid day, it’s because your sweat is evaporating into the air — the...