Have you ever asked yourself what a manual volume damper (MVD) actually is? I started asking hundreds of people in the HVAC/R industry, including air-balance technicians, this question. I received the same answer from 99 percent of the people I asked: “A manual volume damper is a device installed in the duct to damper down …
An end suction pump complete with isolation valves, vibration isolators, a suction strainer, long-radius ell and reducer at inlet, spring-supported inertia block, drain pan, and other amenities normally associated with hydronic service is a single stage pump with only one impeller. Isolation valves, if required, are typically butterfly, gate, plug, or ball valves, depending upon …
Design And Construction Standards For End Suction Pumps Read More »
A centrifugal pump is a continuously acting pump that moves liquid by accelerating it radially outward in a rotating member (called an impeller) to a surrounding case. The impeller is essentially a rotating disk with vanes attached to it. Arrows indicate the direction of rotation and the direction of flow. The vanes on the impeller …
Understanding system pressure and its effect on system performance is an important consideration when designing and installing forced-air zoned systems. It’s true that system pressure can be greater in zoned forced-air systems, but how zoning systems are designed by their manufacturer and installed by the local contractor have a definite impact on how the system …
Understanding System Pressure and Residential Zone Controls Read More »
When it comes to the bottom line, there are two ways that organizations can look at the facilities they occupy. The traditional approach is to see facilities as a cost. This focus on the inputs to a business process leads naturally to cost control and expense cuts as organizations strive to reduce expenditures, cut staff, …
For Facility Executives, The Bottom Line Can’t Be Measured Only In Dollars And Cents Read More »
Sizing a domestic water heater system constitutes an art form more than an exact science. For anything other than a small residential system, you cannot simply go to a table or chart and make your selection. Codes provide only generalizations such as “Hot and cold water shall be supplied to all sinks, lavatories, showers, etc.” …
Medical air systems are a vital element of all hospitals and most other healthcare facilities. The engineer must consider expense, capacity, physical size and weight, space limitations, and mechanical and electrical utility availability in choosing a system for a particular project. It is important to coordinate the equipment selections with the owner as well as …
Using Method 1 A new apartment building will have 16 three-bedroom units. Each unit will have a clothes washer, kitchen sink, dishwasher, two lavatories, and two tubs with showers. The owner has requested a storage tank system. Assume that each apartment will house a maximum of 5 people. The owner is marketing the building to …
Sizing Domestic Water Heater Systems – Two Sample Calculations Read More »
Shopping for a new vehicle or vehicles for your HVACR business is an important step in keeping your business healthy and profitable. As with any major purchase, smart shopping techniques and good research are the key to making a good decision. Factors to consider when shopping for new vehicles for your business include considerations such …
Choosing The Right Truck Or Van For Your HVACR Business Read More »
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