# exergy efficiency

## Universal dependence for determining exergetic output-input ratio of air split-conditioner heat pump

Today, in air conditioning and heating systems for small rooms of industrial, public, and residential buildings, the use of heat pumps of air split-conditioners is becoming more common.  However, heat pumps of air split-conditioners are energy-intensive equipment, and, therefore, the need to increase their energy efficiency arises.  It is important to reduce energy consumption during the refrigeration machines operating in the mode of heat pump in air split-conditioners, which is possible using a modern method of thermodynamics — an exergetic one.  Exergetic an

## Mathematical modeling bringing the operation of air split conditioners heat pumps to the same internal temperature conditions

Nowadays, the use of heat pumps (HP) of air split-conditioners in air conditioning and heating systems of small industrial, public and residential facilities is becoming more common.  It is known that the nominal heat capacity of HP of air split-conditioners is given in catalogs or reference literature under standard outdoor temperature conditions, namely: outdoor air temperature $+7\,{}^\circ$C, indoor air temperature $+21\,{}^\circ$C.  At the same time, manufacturers of air split-conditioners do not ensure that, regardless of the size of heating capacity, all air spli

## Mathematical modeling of an air split-conditioner heat pump operation for investigation its exergetic efficiency

In the modern technologies related to energy transformation, namely in the field of heat pumps of air split-conditioners (“air-to-air”), an important place is occupied by apparatuses and processes, which energy perfection can be objectively evaluated only on the basis of analysis of their exergy efficiency. This allowed substantiating the actuality of the research task due to insufficient information on the exergy efficiency of the use of heat pumps of air split-conditioners and their elements.

## Investigations on the Innovation Model of Exergy Effectiveness of Air Conditioning System for Operating Cleanrooms

The issue of fuel and energy saving is a top priority for energy technological systems (ETS) such as air conditioning systems (ACS). Thus, reduction of energy consumption for ACS requires optimization of these systems which can be obtained on the basis of the exergy analysis. This analysis takes into account not only the quantity of the energy being consumed but also its quality. By taking into account the exergy during calculation of balances and various characteristics of ETC (including ACS) the scientific and engineering problems can be solved in a simple and easily understandable way.

## The Estimation of Exergy Efficiency and Exergy Losses in Air Conditioning Systems of Operating Cleanrooms by a Grassmann Diagram

An important place in the up-to-date technologies related to energy transformation is occupied by the processes and equipment for which the objective value of energy perfection can be defined only on the basis of the thermodynamic analysis. The simplest method of thermodynamic analysis is the energy method based on the law of energy conservation. It provides the possibility to estimate the absolute and relative energy losses and to reveal equipment and processes with the highest losses.

## Analysis of Exergy Efficiency and Ways of Energy Saving in Air Conditioning System for a Cleanroom

In modern technologies, which are related to energy transformation, namely in air conditioning systems, important places are occupied by equipment and processes, the objective estimation of value of its energy perfection can be defined only on the basis of analysis of its exergy efficiency. So, reducing the cost of energy consumed by air conditioning systems preconditions the need for its optimization, which can be fully achieved by virtue of exergy analysis that takes into account not only the quantity but also the quality of energy spent.