Abstract
Transition processes for different modes of functioning of elements of the climate system model are experimentally investigated and analyzed. The following elements have been selected as the objects of experimental research: the air heater and the fan as the main elements that are part of each climate system. The system under study consisted of the following sequential elements: air heater-fan-room. The relative excess heat is proposed as a dimensionless parameter in the analysis and normalization of experimental data. First, the relative excess heat takes into account changes in temperature, moisture content and flow rate of humid air, and secondly, allows identifying similarities in the processes of change over time of the thermodynamic state of the air when passing through the climate system elements for different operating modes of the fan and air heater. Analysis of the evolution of relative excess heat during transient changes in the parameters of the flow of humid air, as in case of abrupt changes in performance of a heater but with a fixed performance of a fan and in case of abrupt changes in performance of a fan, but with a fixed power of the air heater. The regularities of the evolution of relative excess heat in the flow of moist air and its most important qualitative types when passing through the elements of the model climate system are shown. It was found that the types of behavior of relative excess heat depend only on the state in which the elements of the system are located during the transition process, and not on the element itself as a physical object.
Highlights
Providing thermal conditions in buildings for various purposes requires stabilization of the specified parameters of the microclimate at a certain level
The evolution of the relative excess heat of the flow passing through the air heater
R f and the room Qrr shows that their qualitative representation is provided only by the state of the elements of the climate system in which they are during the transition process
Summary
Providing thermal conditions in buildings for various purposes requires stabilization of the specified parameters of the microclimate at a certain level. This requires, on the one hand, certain material and energy resources. External and internal disturbances of microclimate parameters can be periodic (for example, daily, seasonal) or random. This determines the non-stationary thermodynamic mode of climatic systems. Because of the level of requirements to the quality of the microclimate, the climate system can be functionally quite simple, for example, convection heating and quite complex, for example, the air conditioning system in combination with radiant systems for heating and cooling [1, 2]. At any level of complexity of climate systems, the task is to study transients of changes in the parameters of the state of a stream of humid air as it passes through the elements of the climate system, that is, to study the response of a stream to an external disturbance
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