Accession Number:

ADA522667

Title:

Predictions of Energy Savings in HVAC Systems by Lumped Models (Preprint)

Descriptive Note:

Corporate Author:

VILLANOVA UNIV PA DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

• Wemhoff, A. P.
• Frank, M. V.

Report Date:

2010-04-14

Pagination or Media Count:

26.0

Abstract:

An approach to optimizing the energy e ciency of a Heating, Ventilating and Air Conditioning HVAC system is presented that utilizes computational predictions of the effect of heat load distribution on moist air temperature density, and humidity variation. Lumped-HVAC L-HVAC is a new lumped parameter code that couples fluid transport, energy transport, thermodynamics and psychrometrics in an HVAC system. This code contains a nonlinear implicit solution algorithm for steady-state and transient calculations for flow resistance, water mass balance, and energy conservation. LHVAC has been validated using a simplified analytical model, the commercial lumped parameter code SINDAFLUINT, and experimental measurements. Steady-state calculations for a single-room system suggest an order of magnitude greater energy savings using a variable chiller power control approach compared to control damper and variable-drive fan approaches. L-HVAC was also applied to predict that the fraction of latent to total heat load in influences the steady-state system temperature by up to 0.4 degrees C for the example system in this study.

Descriptors:

• *ENERGY MANAGEMENT
• *ENERGY CONSERVATION
• STEADY STATE
• TEMPERATURE
• THERMODYNAMICS
• COOLING AND VENTILATING EQUIPMENT
• FLOW
• HUMIDITY
• ALGORITHMS
• MATHEMATICAL MODELS
• ENERGY TRANSFER

Subject Categories:

• Non-electrical Energy Conversion
• Numerical Mathematics
• Operations Research

Distribution Statement:

APPROVED FOR PUBLIC RELEASE