#Velometer vs anemometer series#
A hard start kit consists of a start capacitor wired in series with a potential relay, which increases the torque on the compressor and removes the start capacitor from the circuit. Hard starts may even lead to premature failure if the potential relay fails and can’t take the start capacitor out of the circuit.ĮasyStart has a different wiring configuration compared to hard start kits. It attempts to avoid drawing unnecessary inrush current, which is very common with hard starts. The EasyStart marks a paradigm shift in how we think about “saving” compressors. A hard start abruptly ramps up the voltage and current to the motor start a soft start is a much gentler start that results from a gradual voltage and current increase on the start AND run windings. Micro-Air’s “EasyStart” provides a soft start rather than a hard start. Matteo Giovanetti from Micro-Air joins the HVAC School podcast to talk about the differences between a hard start and an EasyStart. The cool thing is that this understanding can help both designers and commissioning technicians to match equipment properly and even make further adjustments using airflow to get a near-perfect match, which leads to lower power consumption, less short cycling, and better humidity control. You can easily calculate the SHR by dividing the sensible capacity by the total capacity, and the latent is simply the sensible subtracted from the total. Instead, it lists the specific sensible and total capacities. This example from Carrier has no SHR listed. In this example, you would need to multiply the total capacity x SHR to calculate the actual sensible and latent capacity. In the example above from a Lennox unit, you can see that the SHR is listed and highly variable based on outdoor temperature, airflow setting, and indoor wet-bulb and dry-bulb temperatures. It does often need some digging into manufacturers' specs to interpret this data for the equipment. These guidelines include matching the space SHR to a piece of equipment that will make a good match at similar conditions. By following ACCA (Manual J & S) and ASHRAE (62.2 & 62.1, for example) standards, a designer will have guidelines to follow. They will then match up with equipment accordingly based not only on one set of design conditions but also on the range of seasonal and occupant conditions that the structure is likely to experience based on design and climate. When doing a load calculation, a good designer will calculate and consider the internal and external latent and sensible loads. When a system has an SHR rating listed, it would often be at AHRI conditions unless the specs state otherwise.
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In the HVAC industry, there is a set of standard conditions used to compare one piece of equipment to another. Lower SHR = less change in temperature and more humidity removed Higher SHR (closer to 1.0) = More change in temperature and less humidity removed The percentage of the capacity that goes toward sensible cooling at a given set of conditions for a given piece of equipment or space is called SENSIBLE HEAT RATIO (SHR). So, a system that has an SHR 0f 0.70 and 30,000 total BTUs of capacity at a set of conditions would produce 21,000 BTUs of sensible cooling and 9,000 BTUs of latent removal because 30,000 x 0.7 = 21,000, and the rest 30,000 x 0.3 = 9,000. The BTUs that go toward changing the TEMPERATURE of the air are called SENSIBLE, and the ones that go toward removing water from the air are called LATENT. In most cases, during the cooling mode, a portion of those BTUs will go toward changing the temperature of the air, and a part will go toward changing vapor water in the air into water that collects on the evaporator and then drains out. Every piece of air conditioning equipment can move a certain amount of heat BTUs (British Thermal Units) at set conditions.