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ONE CAUSE FOR ICED-UP EVAPORATORS

In the HVACR world, it is not impossible that the designers of a walk-in cooler/freezer to mistakenly chose the wrong FPI (fins per inch) selection for the application you are servicing. Here is a table to reference when you are looking at possible causes of an iced-up coil. With fin spacing too close, frost can easily bridge the gap and quickly reduce air flow through the evaporator.

The proper selection of fins per inch plays a role in maintaining proper humidity levels in the conditioned space as well. The bottom line is this: don’t always assume that the application engineer can’t make a mistake in the selection process. Always look at this factor when troubleshooting your HVACR evaporator problems.

EXCERPT FROM Technical Manual Series available at the ONLINE STORE at RSES.ORG, your HVACR training authority.

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A GAME-CHANGING APP

I just can’t say enough about an app that has become an essential part of my life and the overall operation of our HVACR service team.

I am talking about EVERNOTE. It is one of the best ways to assemble, organize and present information that I have ever seen. Now you may be thinking that I am compensated for endorsing this product but you are wrong. I am compensated by using the product. I use it for training purposes as well. It has a great presentation mode that I use instead of powerpoint slides.

I use it many times per day. It is extremely useful when we have our weekly service huddle meeting.

Below is a screenshot sampling one of our huddle meeting frameworks.

You can easily hyperlink the topics to other notes that have been organized into specific Notebooks.

We also have the essential Notebooks shared with all the service techs. It is feature-rich and the beauty is that it syncs across just about all platforms.

An example list of our company shared Notebooks contain the following topics: Work Data, Parts Information, Site Information, Memos, Policies, Training, etc. In these Notebooks are contained over 500 notes and training presentations. It is easily searchable for specific notes inside these Notebooks.

As we go throughout the week and run across some useful topic to discuss or encounter a recurring issue, we add it to the list for “Monday” and we keep the team informed. It helps us to maintain a near-paperless approach to our day to day business practices. For all our larger digital files that contain operation manuals and other manufacturer information, we use Box, which contains over 12GB of technical information for our team to access.

My wife and I both have the premium version and use it for all our financial paperwork and household business. Click here to for a free trial of Evernote.

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TESTING AIR FLOW IN SUPERMARKET CASES

One of the ways to assure that a customer’s case is performing as it should is to test the airflow. One of the best ways to do this is with a test instrument that measures feet per minute as illustrated.

Be sure to measure the airflow at the case discharge air outlet as illustrated below:

The manufacturer recommends that the best time to measure the case airflow is during the warmest time during defrost as the case cycle is terminating.

Below is a manufacturers chart detailing an example of a case specifications including the case design average air flow. Without the proper air flow, the case temperature will not reach the desired set point and the product integrity will suffer.


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Indoor Air Quality Begins Here

The final factor in evaluating the air distribution in a space is the comfort of the occupants. In general, a person is thermally comfortable when body heat loss equals body heat production. What most people call a “draft” is simply a slight movement of air that results in a local feeling of “coolness.” It has been determined that a velocity change of 15 ft/min has about the same effect on comfort as a 1°F of temperature change. KEEP READING BELOW…..

A typical room air distribution system with local air velocities of less than 40 to 80 ft/min will satisfy 80% of occupants. Localized air temperatures should be less than 2°F below the general room temperature. The temperature near the floor should be less than 4°F below that at about shoulder height. For heating, local air velocities generally are below 40 ft/min. For cooling, local air velocities should be between 40 and 80 ft/min.

EXCERPT FROM “THE TECHNICAL INSTITUTE MANUALS,” available from the ONLINE STORE AT RSES.ORG

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RSES Offers HC Training, NATE Testing at the 2018 AHR Expo

Rolling Meadows, Ill. (Dec. 21, 2017) – RSES will be an active player during the 2018 AHR Expo being held in Chicago on Jan. 22–24, 2018 at McCormick Place in Chicago.
In addition to residing at booth No. 4443 during the show, RSES Region 2 Director Art Miller, CMS, RCT, will be presenting “Hydrocarbons as Refrigerants and Alternatives to HFCs” on Monday, Jan. 22 from 8 a.m. to 12 p.m. in room S103D. This free session will review HC regulations and standards, refrigerant properties and safety, including the alternatives HFC-32 and HFOs, system component compatibility, servicing procedures, the refrigeration cycle and cylinder storage and transport. No registration is required. READ MORE HERE
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Supermarkets | Danfoss

In the market of reliable and highly efficient food retail and supermarket refrigeration systems, Danfoss is the solution. Our components are designed to provide the lowest total cost of ownership, while at the same time reducing the carbon footprint of supermarket refrigeration systems. READ MORE

Danfoss is a leading supplier within food retail With our ADAP-KOOL solutions we ensure food safety and energy efficiency in all food retail applications,

Source: Supermarkets | Danfoss

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TECUMSEH’S BOXLOAD.COM – ESSENTIAL TOOLS


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ISN’T TECHNOLOGY SOMETHING?


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Top 4 Benefits of Energy Modeling

Have you utilized energy modeling to gain insights on your building’s energy consumption? Take a look at the top 4 benefits and learn the power of its impact from Daikin Energy Modeling Engineer, Judy Peters: READ MORE HERE  


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iManifold integration into MessureQUICK – MeasureQUICK

Awesome times at MeasureQUICK! What a difference a year makes. The integration of iManifold into MeausreQUICK breaths new life into a product that so many of you invested in. Thanks for your contin…

Source: iManifold integration into MessureQUICK – MeasureQUICK