Heating Water and Tap Water Production with an Air-to-Water Heat Pump by Using the Waste Heat of an Oil-Free Air Compressor

Cem Gulseven,M Zeki Yilmazoglu,S.I Tanabe,H Zhang,L Mazzarela,M.C Gameiro Da Silva,C Inard,J Kurnitski,P Wargocki,I Nastase,G Cao

doi:10.1051/e3sconf/201911106034

Abstract

Existing buildings require optimization of the individual heating systems to decrease the energy consumption or energy use intensity (EUI) with heat recovery systems to maintain the sustainability. In terms of energy use intensity, hospitals are considered as the second highest EUI among diverse types of buildings. Therefore, to decrease energy use intensity in hospitals heat recovery options have to be analysed. In this application, oil-free air compressors’ waste heat is recovered by using air-to-water heat pumps for providing hot tap water (around 10% of total) during summer mode and heating water for radiators placed in an emergency waiting room (42 m2 area) during winter mode at Gazi University Hospital, in Turkey. The results showed that previously the unserviceable area get in use with a PMV value of +1. The payback period for the implemented system is found to be 2-4 years depending on heat load variations.

Highlights

The basic necessities of humanity such as energy, education, security, and healthcare are progressively growing and energy consumption related to these needs are growing in demand as parallel with increasing population [1].The need for healthcare facilities is growing by urbanization and increasing amount of diseases through the future
Electricity consumption of healthcare facilities by end-use is 248 trillion Btu according to the report of EIA, in 2003 Commercial Buildings Energy Consumption Survey [3]
The presented heat recovery operation in this work is obtained from oil-free air compressors waste heat by using air-to-water heat pumps (2 x 16 kW) to produce heating water for emergency waiting room in winter

Summary

Introduction

The basic necessities of humanity such as energy, education, security, and healthcare are progressively growing and energy consumption related to these needs are growing in demand as parallel with increasing population [1]. Hospitals are in the third place in terms of average square feet per building energy consumption, mostly from HVAC applications to heat spaces [2] These HVAC applications include the air supply for healthcare operations. The presented heat recovery operation in this work is obtained from oil-free air compressors waste heat by using air-to-water heat pumps (2 x 16 kW) to produce heating water for emergency waiting room in winter This system provides hot water for use in summer time to a block, belonging to hospital that is consisted of 60 inpatient rooms. This application examines the possibility of using the heat pumps in each season to decrease the payback time

Application

Conclusions