Is there a formula for calculating the Boiler Thermal Efficiency using HHV. Should the modeled boiler efficiency be seasonal taking into account part load conditions.

Hi, I'm running an energy simulation on a three floors office building. This building have also an entrance hall. The HVAC system for the office part is a VRV Fan Coil System with external air con

Seems that some of my questions are not easy to answer. Here is another question for the same lab project. Fan system Power limitations are calculated according to Table 6.5.3.1.1A of ASHRAE 90.1-

RE: LEED CS EAc1 We need input on how to model the 6th floor residential portion of our mixed-use building? Our specific concern is the lighting. Any help is appreciated. Thanks--

I am doing the energy model for a CS project.

In the building for which I'm preparing energy simulation, there's an underground garage which is heated only by used recirculated air from offices above.

Dear Sir/Madam We are certifying a large retail mall which have a large carpark block ( five levels).

I have a C&S medical office building that is 88% tenant space (by area) and am trying to figure out how to correctly document the owner/tenant % of the building energy cost for the Core and She

How should one model existing glazing U-Values and Solar Heat Gain values when they are unknown (they were installed 24 years ago). I am referring to the Baseline Model ASHRAE Table G3.1 5f