Volume 77, July 2014, Pages 425–431 Energy performance of direct expansion air handling unit in office buildings Received 16 October 2013, Revised 17 March 2014, Accepted 19 March 2014, Available online 28 March 2014•We create the EnergyPlus simulation model based on a field monitoring.•We show a process to calibrate the model to measured electricity consumption.•Modelling the use of a building and its system by occupants is a key factor in energy simulation.•Changing occupant behaviour can reduce a half of cooling energy consumption.Buildings and their occupants generate a large amount of carbon emissions. In Korea, buildings contribute to about 30% of the total greenhouse gases emissions, and the proportion has been rapidly increasing to the level of the developed counties (i.e., more than 40% of the total emissions. A direct expansion air handling unit, of which a refrigerant is directly delivered to the heating and cooling, has a potential to save cooling and heating energy use, compared to water-based central air conditioning systems.

The aim of this study is to compare heating and cooling energy uses of an identical office building but with different air conditioning systems, i.e. direct expansion and water-based air conditioning systems. Dynamic building energy simulations that reflect the actual use of a monitored building and its air handling unit operation have been conducted in this study. Simulation results show good agreement with the actual energy consumption obtained from the field measurements of the building. Our study quantifies the amount of cooling and heating energy uses saved by a direct expansion air handing unit and reveals reasons for this savings, i.e. higher energy efficiency of the unit and reduction in pump and fan energy demands.Keywords; ; ; ; ; Copyright © 2014 Elsevier B.V. Air Cooled Direct Expansion Air Handling Unit US $ / Piece Request a custom order and have something just for you! 1, Applies patented double frame structure, the air leakage ratio is 0.16%.2, Applies module design, each module 100mm, proportionate increase, adapt to the requirement of site conditions on the unit width and height.3, The internal surface is flat and smooth, not easy to dust, no secondary pollution, suitable for clean place to use.3, External panel is high quality anticorrosion color steel plate

, and coated surface, can prevent the scratch panel in assembly and transportation.4, High efficient screw compressor, the most advanced gear design, high precision processing, high efficiency.5, Applies famous brands refrigerant control assembly such as ALCO, SPORLAN, DANFOSS, steady quality.6, Applies double inlet centrifugal fan, and special anti-vibration structure, making the unit have small vibration, low noise.7,  Applies axial flow fan, peaceful operation.8, Applies single-chip microcomputer controller, LCD display screen, colorful backlighting, and multi-function mode for selection.9, Having the automatic defrosting and manual defrost function. Zhejiang King Air Conditioner Co., Ltd. Manufacturer/Factory & Trading Company You Might Also Like Direct Expansion Air Handling Unit Rooftop Air Conditioning Unit Air Handlig Unit in Vertical Type Mini Source Heat Pump Purification Modular Air Handling Unit (Split Unit) Air Cooled Chiller with R22

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Environment Friendly Water Cooled Modular Scroll Water Chiller water source/underground source heat pump Air cooled heat pump Not if it's Inside Your Air Handling Unit! CTM AIR HANDLING PREVENTATIVE MAINTENANCE PROGRAMMESaves on Operating Costs, Reduces Downtime & Extends Equipment Life! All air handling units eventually deteriorate. This can present serious consequences for building managers and owners alike. Poorly operating air handling units typically create high energy costs which seriously affect the bottom line. Potential health risks, including Sick Building Syndrome, increase due to poor air quality in the building and cannot be ignored. Replacement of the equipment should it fail, is both expensive and inconvenient, causing tenant service interruptions. CTM trained inspectors asses the condition of the air handling unit(s) and repair or replace components in order to reestablish optimum unit performance. CTM's Preventative Maintenance/Reconstruction Programmes save on operating costs, reduce system downtime, and extend equipment life.

Rusted air handler fan housing Rusting fan housings result in perforation and structural failure. Repaired housing, coated with high grade epoxy Solution: Remove rust and dirt, prepare surface properly and apply high grade epoxy coating. INSIDE YOUR AIR HANDLING UNIT: Rusted supports, plugged coils & leaking pan 1. Unit casing and structural members become rusted and weak. Solution: Remove rust and epoxy coat or replace with new galvanized panels and supports. 2. Heating/Cooling coils become plugged with airborne dirt or begin leaking. Solution: Thorough cleaning with water pressure and a rust inhibiting chemical cleaner. Or replace the coils. 3. Coil supports may be rusted-out. Solution: Replace with new hot dipped galvanized support. New, High Efficiency Media Insulation loosens and often falls off the panels. Solution: Remove and replace with new insulation. Humidification media becomes torn or plugged with mineral deposits.