Recent content by red4life

Hello all, I'm modelling an office building using Google SketchUp to determine its cooling load during summer. Unfortunately, the default building materials (external walls, floor, roof etc.) seem like they are for residential buildings. Can someone please tell me what are the typical...

Ok people, for instance I want to calculate the fan input power (assuming efficiency of 0.5). I will use the equation: Fan input power = (volume flow rate X pressure) / fan efficiency How do I calculate the "pressure" in that equation? If I simply use the friction (major) loss formula, I...

I'm sorry I don't understand what a restriction curve is. Is this the same as a system curve? If yes, then no I don't have one. I shall point out that the tubes will be buried 3m deep. The friction coefficient is 0.022 and head loss is 0.75m (just taking the horizontal section of pipe i.e. no...

Thanks for the welcome! Basically the Earth tube has an inlet and outlet. A fan draws ambient air at the inlet and pumps the air through the tube. The air at outlet will be fed into an HVAC system. What I need to know is, how can I determine the pressure that needs to be created in order...

Hello everyone, I am trying to simulate Earth tubes for pre-cooling using the EnergyPlus software. Basically a fan will be used to circulate ambient air through an underground horizontal pipe. The software requires an input field of "Fan Pressure Rise" which I am guessing is the pressure...