Question

Task 4 It is proposed that the shower facility at a new swimming pool will recover heat from flue of the central boiler to provide a small supply of hot water for the showers using a water-gas heat exchanger. The required water temperature is approximately 38 °C and the flow rate of water per shower is 15 litres per minute. Up to 20 showers will be in use at any one time. If water enters the facility at 15 °C and flue gas is available at 250 °C, what is the maximum flow rate of flue gas required to heat the showers? |(N.b the heat capacity of water is approximately 4 J/gK)

Answer 1

Ascumphons pasallel heal enhanger ued heat tranfer aea is tutficient hoal thansfer oceuus te 1e upto marumum speifie equrl to ais dest Capacity ofkce fe gas is tacenar Le Cp d ais 2 1.05 KIR IC Tou 8c Tin Water 1 / Is tibe perminade tlowaate of water Des howes = 15 x I0 m/mio Late water per chower Male eg/min temperatae 2 50 temp 38 c tempetatue protile of wate 7 langthof heat erchanger en oceute eden unhl tempelahle &3 malimum tempelature of water s the the heat tranfer 17 leachet 3& So lue gar MeCTin Tout) es0-3 A/min per shoues Ms Cro intw-Tina = MXI.OS

-total 늘 flous the gaver mat mx no oshowes 6199 X20 Mau /mio 123.969 al m/min sate of flue gare 129.989 volume floue Astimpto Counler o co heat exchanger s ed dempesatue profle ofleugan 2-50 temp. oh waks ength -of heatenchaya 157 -3hxs MYI.OS2 S0- /min Aule 이 thegare blou mar m/min Late of egar volume low