Dar Al Handasah Consultants Pvt. Ltd.

Pune, India

Dar Al Handasah Consultants Pvt. Ltd.

Pune, India
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Sarkar M.,Dar Al Handasah Consultants Pvt. Ltd.
Energy and Buildings | Year: 2015

Dew point temperature (DPT) of moist air plays a key role in ascertaining the comfort condition as well as indoor air quality for built environments. This article outlines a simple method to transform the fundamental relation between saturation pressure and temperature into a concise mathematical form for dew point temperatures of moist air that is applicable for normal comfort air conditioning systems. The error between the results from the derived equation and the ASHRAE correlation is found to be well within the accuracy limits of commonly used climatic sensors. Based on this equation, a simple computational method for wet bulb temperature (WBT) is proposed. The results from this method show minuscule error in comparison with the standard psychrometric data. Also, the DPT equation is used as a basis for plotting wet sensible and latent loads of a cooling dehumidifying coil by applying both temperature and humidity discretization schemes. Application of the inherently simple and aptly accurate DPT equation results in the representation of subtle variations in coil loads at varying psychrometric parameters of moist air, to be conclusive and theoretically conformal. © 2014 Elsevier B.V. All rights reserved.


Sarkar M.,Dar Al Handasah Consultants Pvt. Ltd
Energy and Buildings | Year: 2013

Blow-through (BT) and draw-through (DT) modes are the two common types of air handling unit (AHU) configurations that are prevalent in heating ventilation and air conditioning (HVAC) systems in existence. The arrangements of a supply fan and a cooling coil in these systems have advantages on each other in terms of cooling coil loads, moisture removal and noise levels. In the present work, a simple equipment load formulations for the two modes are shown, which may be used by designers for early diagnosis and decision making. From the comparison of derived loads for a cooling-dehumidifying chilled water coil, it is proved that DT type AHU shows higher cooling load than BT type, when supply air temperature from both these types of AHU is same. It is also seen that the difference between these coil-loads are actually affected by the AHU inlet condition and fan heat addition. An early choice between a DT and a BT system based on usage and requirement saves a lot of future hassles and untimely retrofits. © 2013 Elsevier B.V. All rights reserved.


Sarkar M.,Dar Al Handasah Consultants Pvt. Ltd
Energy and Buildings | Year: 2015

This paper aims towards the development of a simple mathematical model for chilled water cooling coil based on the bypass factor as a principal input parameter. The methodology involves a temperature-based discretization of the coil that precisely shows when the coil will be dry, wet or partially wet. This procedure not only depicts the actual cooling-dehumidification profile of the coil, but also allows calculation of sensible and latent coil loads by the summations of individual loads of discrete coil elements. Maximum deviations in the range of ±5% for sensible and total coil loads are obtained between majorities of the findings from the theoretical model and experimental data available in literature. A close compliance with actual results and ease of application make this mathematical model a good choice for energy simulation tools. © 2015 Elsevier B.V. All rights reserved.

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