지역난방열원이 적용된 고효율 제습-증발냉각 시스템의 1차 에너지 및 이산화탄소 절감 분석

Abstract

Chapter 1 describes the research background, literature review, and approach and direction of this research.

Chapter 2 describes the characteristics of desiccant-enhanced evaporative (DEVap) cooler and operating strategies of DEVap cooling system.

Chapter 3 describes the characteristics of district heat source applied to DEVap cooling system.

Chapter 4 describes the energy simulation using model building and the components models utilized in the DEVap cooling system.

Chapter 5 describes primary energy factor used in this research.

Chapter 6 describes heat and electricity demands of DEVap cooling system. Using estimated energy demands, primary energy consumption and CO2 emission is compared between district heat source and conventional boiler.

Chapter 7 describes the conclusion of this research, and the summary is as follows; The purpose of this research is to evaluate the primary energy and CO2 emission savings of a district heat source applied to a desiccant-enhanced evaporative (DEVap) cooling system. The DEVap system consists of an internally cooled liquid desiccant dehumidifier and dew point evaporative cooler connected in series. The liquid desiccant unit requires a heat source for regenerating the weak desiccant solution, which menas that the DEVap cooler is a thermally driven cooling system. It can provide energy benefits when the supplied heat comes from waste heat or renewable heat sources. In this research, district heat obtained from a combined heat and power (CHP) system was used as the heat source for the DEVap system. The primary energy consumption and CO2 emission rate of the proposed system with a district heat source were estimated using a detailed energy simulation and compared with those powered by a conventional gas boiler.

This study is composed of 7 chapters and each chapter is as the following; 1) This research was conducted to evaluate the primary energy and CO2 emission savings of a DEVap cooling system with a district heat source during the cooling season. In terms of energy demand, the DEVap system needed much more heat energy than electricity, which can be a great advantage during the cooling season.

2) The DEVap cooling system with a district heat source showed 46.2% primary energy savings compared to the same system using a conventional boiler.

3) Considering the environmental aspect, the DEVap cooling system with district heat source produced approximately 40.5% less CO2 emission than the same system using the boiler.

4) This result showed that a thermally driven cooling system or a non-vapor-compression system such as the DEVap system is highly suitable for use with district heat sources and has great potential for energy savings and CO2 emission reduction. Furthermore, the DEVap cooling system can improve the energy efficiency of the combined heat and power plant, and can balance the electricity and heat usage during the cooling season as well.