Comparative Analysis on Load Characteristic of Intermittently Conditioned Buildings for Different Wall Insulation Forms

Liting Yuan,Xiaolong Wang,Yanyan Huang,Zhiyi Wang

doi:10.3390/en13184974

Liting Yuan, Xiaolong Wang + Show 2 more

Open Access

https://doi.org/10.3390/en13184974

Copy DOI

Abstract

The Air-conditioning System (ACS), used in office buildings in the hot summer and cold winter zone of China, are always operate intermittently. The dynamic thermal behaviors of building walls with real climate conditions may be different from those with only the representative day’s climate conditions, due to the time varying nature of the climate, which will lead to the variation of the ACS loads. A numerical calculation was performed to analyze the effects of insulation form on heat behavior of external walls and ACS loads. The results indicate that cooling transmission load with inside insulation reaches its maximum value when the solar-air temperature in daytime is the highest, while that with outside insulation occurs at the time when the air temperature at night is the highest during summer. Heating transmission load for the wall with external and internal insulation both peaks in the day with lowest mean outdoor temperature during the last non-working period. Inside insulation can be considered a better way to reduce the peak load, peak-valley load difference and energy consumption.

Highlights

The hot summer and cold winter (HSCW) climate zone of China is characterized by a developed economy and high population density [1]
Appropriate design of building envelope is one of the useful ways to realize effective energy conservation, given that 35% of the air conditioning systems (ACS) energy consumption is caused by the heat transfer of building envelope in HSCW climate zone [1]
The effects of insulation form on peak loads, peak-valley loads difference and total loads were studied under the real climatic conditions of Shanghai, presenting HSCW zone in China

Summary

Introduction

The hot summer and cold winter (HSCW) climate zone of China is characterized by a developed economy and high population density [1]. Appropriate design of building envelope is one of the useful ways to realize effective energy conservation, given that 35% of the ACS energy consumption is caused by the heat transfer of building envelope in HSCW climate zone [1]. Maximum load levelling is realized by reducing peak and enhancing valley of loads, i.e., reduction of the difference between peak and valley load [3]. The reduction of load, peak load and peak-valley load difference are quite significant; first, it reduces the large energy demand; second, it allows smaller ACS capacity and higher ACS energy efficiency [4]; third, it promote ACS operational stability, and increases ACS energy efficiency [3]. Peak load, peak-valley load difference and energy consumption of ACS are all key aspect of its design

Methods

Discussion

Conclusion