Air conditioning and power generation for residential applications using liquid nitrogen

Research output: Contribution to journalArticle

Colleges, School and Institutes

Abstract

Current air conditioning (AC) systems consume a significant amount of energy, particularly during peak times where most electricity suppliers face difficulties to meet the users’ demands, and the global demands for AC systems have increased rapidly over the last few decades leading to significant power consumption and carbon dioxide emissions. This paper presents a new technique that uses liquid nitrogen (LN2) produced from renewable energy sources, or surplus electricity at off peak times, to provide cooling and power for domestic houses. Thermodynamic analyses of various cryogenic cycles have been carried out to achieve the most effective configuration that produces the maximum power output with minimum LN2 flow rate, to meet the required cooling of a 170 m2 dwelling in Libya. A comparison with a conventional AC system was also made. Results showed that at the current LN2 prices, using LN2 to provide cooling and power demands of residential buildings is feasible and saves up to 36% compared to conventional air conditioning systems with an overall thermal efficiency of 74%. However, as the LN2 price decreases to around 1.3 pence per kg, the proposed technology will have significant advantages compared to conventional AC systems with savings of up to 81%.

Details

Original languageEnglish
Pages (from-to)630-640
Number of pages11
JournalApplied Energy
Volume184
Early online date14 Nov 2016
Publication statusPublished - 15 Dec 2016

Keywords

  • Air conditioning, Cold storage, Liquid nitrogen/air, Peak demand