Heat pump for hot water With CO 2 as a refrigerant. Sergio Giro8o Enex srl

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1 Heat pump for hot water With CO 2 as a refrigerant Sergio Giro8o Enex srl

2 CONVENTIONAL HEAT WITH HFC FOR HOT WATER Heat pump combined with mixing tanks.

3 CONVENTIONAL HEAT WITH HFC FOR HOT WATER In convenjonal heat pumps water heajng takes place gradually, with a temperature differenjal from 5 to 8 C for each pass.

4 CONVENTIONAL HEAT WITH HFC FOR HOT WATER SimulaJon- hot water temperature in the water reservoir. Heat pump HFC, capacity 50 kw and tank 5000 liters.

5 COMPARISON R134a/CO 2 CO2

6 AIRHEAT - NEW HEAT PUMP WITH CO2 Heat pump combined with strajficajon water reservoir. CO2 heat pump, capacity 30 kw and reservoir of 2500 liters.

7 EXAMPLE OF CHARGING STORAGE VESSELS AND USE OF HOT WATER The water, inijally at 10 C, is heated immediately to 65 C and is then available at high temperature. The temperature profile in the tank varies depending on the consumpjon, but the hot water is always available at the desired temperature. It is possible the accumulajon of hot water during the night or when there is no use of hot water.

8 STRATIFICATION WATER RESERVOIR Charging Discharging 150 litres

9 HEAT PUMP FOR HOT WATER WITH CO2 AS REFRIGERANT COMPARISON: HEAT PUMP WITH CO2 AS REFRIGERANT - HFC Total volume of water storage Storage temperature Nominal Therminal capacity Average power consump9on Opra9on Time Energy consump9on [liters] [ C] [kw] [hours] [kwh/day] [kwh/day] Conven9ona l heat pump ,0 4,7 84 Enex Airheat ,5 7,9 67 Benefit: ReducJon of water storage cylinder volume Lower electrical capacity installed; Higher temperature of water No risk of Legionella - lower costs for sanitajon services.

10 ECONOMIC ANALYSIS EXAMPLE: HOTEL 120 ROOMS Water consumpjon: 80 liters/room (9,600 liters/day) + 50 C Kitchen consumpjon: liters/day - 50 C Water storage: 3x2.000 liters 65 C Installed unit: AIRHEAT 48 Energy demand: kwh/year Average annual COP: 4,0 MIN MAX Energy cost /year Energy cost /year HEAT PUMP - 0,1 /kwh ,18 /kwh GAS BOILER 10,6 kwh/m 3 0,45 /m ,6 /m OIL BOILER 9,5 kwh/l 1,0 /liter ,2 /liter

11 RANGE AND AVAILABLE OPTIONS Range: 4 sizes(18, 24, 48 and 100 kw nominal) Some available opjons: Cold recovery Double loop water side ConnecJng more units in parallel (up to 12), with inverter- total thermal capacity up to 1200 kw (the largest capacity available)

12 WEB ENEX CALCULATOR LINK: ref.com/eng/heat- pumps- selector- co2.aspx

13 HEAT PUMP CONTROL Control Sonware specifically developed for the applicajon OpJmized operajng parameters Web server for remote connecjon (monitoring & technical support) Measurement of effecjve capacity

14 DEFROSTING - 1 Hot gas defrosjng On demand or by Jmer Not taking heat from hot water Completely managed by controller Fast, as heajng occurs from inside of the coil Low energy consumpjon

15 DEFROSTING - 2 START +6 MIN +12 MIN +15 MIN

CASE STUDY - 1- ITALY HOTEL Hot water N 1 AH24 + N 1 AH48 OpJons : 130 bar +EC venjlator +ETHernet+ cold recovery N 2 Puffer 2500 L hot water N 1 Kooltank 1000 L cold water Purpose of the unit is

16 CASE STUDY - 1- ITALY HOTEL Hot water N 1 AH24 + N 1 AH48 OpJons : 130 bar +EC venjlator +ETHernet+ cold recovery N 2 Puffer 2500 L hot water N 1 Kooltank 1000 L cold water Purpose of the unit is producjon of hot water T=70 C - recovering energy cold side in summer cooling chilled water. Capacity at design condijons total installajon (AH24 + AH48): winter summer Air temperature (source) - 5 C 30 C (Max 45 C) Water temperature in 10 C 20 C Chilled water temperature in/out C Hea9ng capacity [kw] Hot water produc9on [liters/h] Cooling capacity [kw] ,5 COP hea9ng 3,2 4,0 Total COP - - 7,0

CASE STUDY - 2- SPAIN ELDERLY HOUSE N 1 AH24 OpJons : 130 bar +EC venjlator +ETHernet Purpose of the unit is producjon of hot water T=65 C Capacity at design condijons: winter

17 CASE STUDY - 2- SPAIN ELDERLY HOUSE N 1 AH24 OpJons : 130 bar +EC venjlator +ETHernet Purpose of the unit is producjon of hot water T=65 C Capacity at design condijons: winter summer Air temperature (source) - 7 C 30 C (Max 45 C) Water inlet temperature 10 C 20 C Hea9ng capacity [kw] 17,7 29,0 Hot water produc9on [liters/ h] COP hea9ng 3,2 4,0

18 SUMMARY The use of a heat pump for hot water with CO2 is very convenient for applicajons with high consumpjon of hot water (hotels, gyms, hospitals...). The advantage is extremely high for hotels in tourist areas (islands or mountains) where there is no natural gas distribujon network. Performances cerjfied by laboratory tests. The recovery cold side increases economic convenience. Version for space heajng (water C) in development.

Air to Water Heat Pump Utilising Natural Refrigerant C02

Air to Water Heat Pump Utilising Natural Refrigerant C02 1 Contents 1. Product Outline 2. General Features Q-ton Dimensions 3. Product Efficiency Comparisons 4. Commercial Applications 5. Beneficial Applications