Influence of Air Supply Height on Sleep Comfort Through Computational Fluid Dynamics Simulation

Abstract

Taking the bed in the bedroom as an air-conditioning system (ACS), this paper attempts to disclose the influence of air supply height (ASH) on sleep comfort. Specifically, a computational fluid dynamics (CFD) model was established to simulate the air temperature distribution, air speed, and carbon dioxide content (CDC) indoor at five ASHs of the ACS. The simulation results were compared with lab data. On this basis, the aeration efficiency (AE), temperature regulation risk (TRR), and energy-use factor (EUF) of the ACS were analyzed under different working conditions, and the overall efficacy of the ACS was assessed comprehensively by the technique for order of preference by similarity to ideal solution (TOPSIS).

A Steady-State Modeling Method for Direct Expansion Air Conditioning Systems

“…In a DX-AC system, the evaporator cools and dehumidifies the air directly as a cooling coil. Compared with cold-water central airconditioning systems [1], DX-AC systems have now been more extensively used in residential buildings due to its many advantages [2] such as simple structure, flexible installation, low maintenance cost, and high energy efficiency. A correct understanding of the steady-state operating features of the variable-velocity DX-AC system is a prerequisite for designing an effective indoor temperature-humidity synchronous control strategy [3], however, such research data is insufficient.…”