In this case, Actual air flowrate is used. In SA Temperature method, mass flow rate and specific volume of the state-point air is calculated. In this case, Standard air flowrate is used. In Carrier ESHF method, fixed constant is used in the governing equations as given in Carrier system design manual. The two methods give comparable results but not exactly the same (in aPsychroAC) for the following reasons: The norm range of design temperature difference between SA and RA temperatures is about 15 - 22 oF (8 - 12 oC) with a common design target of 18 - 20 oF (10 - 11 oC). In the SA Temperature method, you start with fixing the supply air temperature condition. The supply air temperature condition is then calculated. In the Carrier ESHF method, you start with specifying the coil performance, i.e., coil BF (bypass factor) that is generally representative of the type of equipment you intend to select. They areĬarrier ESHF (Effective Sensible Heat Factor) method Two widely used design approaches to psychrometric air-conditioning calculations are modelled in aPsychroAC. Save-result-to-file function with built-in text file viewer Precool Coil / Precool Air Unit (PAU) module Recirculating or 100% OA (for SA Temperature method only) systemįan heat gain option (draw-thru arrangement only) Carrier ESHF (Effective Sensible Heat Factor) method or Supply Air Temperature method
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