二氧化碳熱泵系統程式模擬

Abstract

本研究即開發以二氧化碳為工作流體的冷凍循環系統程式，進行模擬測試，包括冷媒流率、入出口溫等環境條件的改變對整體冷凍循環的動態影響，以及造成系統效率、COP等參數的改變程度。透過此設計程式，能夠對二氧化碳系統循環有更深入的解析。開發本軟體的目的即是透過模擬改變環境條件，包括冷凝區水側入口條件、蒸發區空氣側的進口條件、此二區的熱交換器幾何尺寸，以及壓縮機的型式(壓縮效率)，去模擬該狀況下的冷凍循環參數之變化。透過此設計程式能讓研究人員能夠了解該狀態下的冷凝熱傳、蒸發熱傳、壓縮作功與冷凍循環整體效率所呈現的趨勢。相信對從事二氧化碳冷媒冷凍循環的研究上有相當的助益。

A simulation model for the CO2 heat pump water heater was developed in this study. A steady state simulation model has been developed to evaluate the system performance of a transcritical carbon dioxide heat pump for simultaneous heating and cooling. Component models of the gas cooler, evaporator, compressor, and expansion valve were constructed with careful consideration for the heat transfer performances. The effects of the inlet water temperature and outside air temperature and other several environmental conditions on the system characteristics were discussed.