I'm in the process of designing the ventilation systems for a lab. A couple of the lab hoods simply vent heat from heat generating equipment. Is anyone aware of a sensor I could use to operate the hoods by detecting the radiant heat from the equipment? I'm assuming I can't use a temerature...
Next week i am going to a military base to perform field work for a renovation. The building is served by a campus steam system. The base engineer has asked me to inspect the condition of the existing steam and condensate branch pipes to the building and determine their condition. While i have...
Next week i am going to a military base to perform field work for a renovation. The building is served by a campus steam system. The base engineer has asked me to inspect the condition of the existing steam and condensate branch pipes to the building and determine their condition. While i have...
I need help with a code question and don't have a copy of this code. I designed a mechanical system in another state based on the 2000 IMC. The 2000 IMC allows you to provide ventilation air based on the actual occupancy of a space rather than the square footage occupancy in the table. The code...
I am having problems with a VAV terminal box serving a row of offices along the exterior of an office building. The VAV box discharges 83F air. The duct discharges from the box into about a 5 foot run of rectangular duct and into a dovetail wye fitting. The duct then runs each way over the...
I am investigating a cooling problem at a local hospital. They have an air handler and associated coil that is about 24 years old. The original specs are as follows:
Airflow = 48,000 cfm
EAT = 80 degrees F
LAT = 50 degrees F
Fluid (Water) = 42 degrees F
Fluid Flow = 380 gpm
The actual...
I'm an HVAC engineer and work mostly with KW's when specifiying power loads. I have seen loads referenced in terms of KVA. What is the difference? Is there a simple conversion?
One very weak part of my companies specifications is chilled & hot water chemical water treatment. The main reason for this is that I've never seen a product vendor in the 10 years I've been in the business. Does anybody know who makes these products or where I can find a guide-spec for them?
I am facing a frustrating situation and would like some insight from some other folks. Three years ago I designed an HVAC system for a church school. It was a two phase job: classrooms and gymnasium/cafeteria. The first phase was built immediately and the second was deferred until more funds...
Are pressure-temperature test valves for HVAC balancing valves a standard size? Or do they vary from manufacturer to manufacturer? The reason I ask is I bought test gages from a manufacturer that sells "green" pumps and tried measuring flow across the triple-duty valve of a company...
