Abstract
The objective of this research is to develop the method of evaluating the design and the operation of air conditioning system. Fundamental method of evaluating the system is decomposing into basic components which have various characteristics respectively. Taking the system into consideration by the unit of decomposition, the system can be analysed and synthesized essentially and easily. Section 1 The author cites a simple design of air conditioning system for example and decomposes of power consumption to fundamental compositions and emphasizes necessity of developing the method of evaluation in air conditioning system. Section 2 Decomposition and evaluation of heat source system with compressor. Decomposition consists of two items. One is efficiency of motor and compressor and the other is power consumption of compressor. The efficiency is evaluated by the difference between actual value of efficiency and standard value of efficiency which is assumed previously. The power consumption of compressor is divided by compressor head. Compressor head consists of heat exchange head and original head which expresses the potential difference between design condition in room and heat source (or heat sink) condition. Heat exchange head is composed of upper pressure side and lower pressure side. The author shows the value of heat exchange head and original head in various heat source systems in table 1. Section 3 Firstly the author shows the characteristics of heat storage tank system. Comparing quantitatively the system with heat storage tank with the system without heat storage tank, the author gets timing relation between two systems. The author divides the characteristics of heat storage tank system into five items as follow. 1) Effect of the night off-peak electricity 2) Heat loss from heat storage tank 3) Variation of Compression efficiency and motor efficiency 4) Variation of supply temperature by mixing and heat loss in tank 5) Effect of heat recovery operation with heat storage tank These characteristics of heat storage tank system lead to the following simplified mutual relation. [numerical formula]
