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Whether you�re looking for a drinking water purifier, shower filter or a true filterless air purifier, Waterwise has the products you want to protect your family�s health at home and away. You might also like these Health & Fitness catalogs Sun-Mar - Composting Toilet Systems Find a portable composting toilet system for use anywhere You're a power user moving through the website with super-human speed. You've disabled JavaScript in your web browser. A third-party browser plugin, such as Ghostery or NoScript, is preventing JavaScript from running. Additional information is available in this support article.What is in this article?: For HVAC Systems, Efficiency Measurements Are The "Delta" Difference There are many brands of test instruments to help measure Delta T, Delta P, and so on. Pictured here is the testo 925 — a temperature measuring instrument particularly suitable for use in the field of HVAC (heating, ventilation, and air conditioning).

When measuring the performance of an HVAC system, the term 'delta' is often used to express the difference between two measurements. Let’s take a look at the family of HVAC industry “deltas” that we include in our day-to-day HVAC slang terms. Delta T, Delta P, Delta V and Delta H and let’s add Delta C. Besides the “difference between two related measurements” that we use, the word delta has an interesting history. Going way back, Delta or “Δ” just happens to be the fourth letter of the Greek alphabet. The name came from the appearance of a three-sided island that forms where two rivers meet. From there, any symbol that looks like a triangle also became known as a delta. Delta T “Delta T” is the most common use of the word delta in the HVAC industry, meaning temperature difference. If the temperature before a cooling coil is 75F and the temperature after the cooling coil is 55F, subtract 55F from a 75F to find a delta t of 20F. Since the first time a service technician tried to explain delta to me, I’ve wrestled with a way to make the definition a little easier to swallow.

It took him 20 minutes and I went away scratching my head. Remember that when talking to new technicians or the office staff. Take time to explain delta to those who need to become familiar with this valuable term. Delta P In our industry, “Delta P” means the difference in two related pressures. For example, when you measure the pressure before a filter and it’s .12-in. WC, then, measure the pressure after the filter and it's .22-in. Now, subtract the .12-in. WC from the.22-in. WC to find the Delta P or pressure difference of .10-in. Once you find a Delta P over a component in an air stream, compare the number to an industry standard. As you learn the industry standards, and compare your test results to them, test results suddenly start making sense.   The typical filter pressure budget for a constant speed fan is 20% of fan rated pressure. For example, a rated system fan of .50-in. WC multiplied by 20% reveals an acceptable filter pressure drop of .10-in. So our example above is ideal.