Analysis of Solar Boosted Heat Pump Water Heater
ANALYSIS OF SOLAR BOOSTED HEAT PUMP WATER HEATERS
ABSTRACT
This paper presents an overview of the solar boosted heat pump water heater technology. The tests made on direct expansion solar assisted heat pumps have shown that good
COP can be attained while using working fluids that do not cause any harm to the environ ment. Modifications to the condenser in the heat pump can be made in order to improve and distribute evenly the heat transferred to the water.
NOMENCLATURE
HPWH – Heat Pump Water Heater
SBHPWH – Solar Boosted Heat Pump Water Heater
SBHP – Solar Boosted Heat Pump
COP – Coefficient Of Performance
SAHP – Solar Assisted Heat Pump
DX-SAHP – Direct Expansion Solar Assisted Heat Pump
Qw – Heat transfer to water
Wc – Electricity consumed by the compressor
CFC – Chlorofluorocarbon
ODP – Ozone Depletion Potential
GWP – Global Warming Potential
transformed into higher grade heat and transferred to the water. An improved type of heat pump has been developed and is known as the Solar Booster Heat Pump Water Heater
(SBHPWH). The principle behind this device is similar to the one described above. The difference lies in the energy source.
Air is still providing energy to the system; however, the evaporator also plays the role of the collector to absorb the radiations emitted by the sun.
There are several advantages to this type of heat pump. The radiation emitted by the sun provides a good source of energy except during the night and on cloudy days. The
SBHP can still operate as it also uses the ambient air as an energy source. Using a refrigerant as the working fluid also prevents the system from rusting and it enables the SHBP to function in low temperature environments where water, which has a higher freezing point, would solidify and not flow in the structure. The refrigerant is usually at a temperature lower or equal to the ambient air which minimizes or even eliminates the heat loss by convection to the surroundings.
ABSTRACT
This paper presents an overview of the solar boosted heat pump water heater technology. The tests made on direct expansion solar assisted heat pumps have shown that good
COP can be attained while using working fluids that do not cause any harm to the environ ment. Modifications to the condenser in the heat pump can be made in order to improve and distribute evenly the heat transferred to the water.
NOMENCLATURE
HPWH – Heat Pump Water Heater
SBHPWH – Solar Boosted Heat Pump Water Heater
SBHP – Solar Boosted Heat Pump
COP – Coefficient Of Performance
SAHP – Solar Assisted Heat Pump
DX-SAHP – Direct Expansion Solar Assisted Heat Pump
Qw – Heat transfer to water
Wc – Electricity consumed by the compressor
CFC – Chlorofluorocarbon
ODP – Ozone Depletion Potential
GWP – Global Warming Potential
transformed into higher grade heat and transferred to the water. An improved type of heat pump has been developed and is known as the Solar Booster Heat Pump Water Heater
(SBHPWH). The principle behind this device is similar to the one described above. The difference lies in the energy source.
Air is still providing energy to the system; however, the evaporator also plays the role of the collector to absorb the radiations emitted by the sun.
There are several advantages to this type of heat pump. The radiation emitted by the sun provides a good source of energy except during the night and on cloudy days. The
SBHP can still operate as it also uses the ambient air as an energy source. Using a refrigerant as the working fluid also prevents the system from rusting and it enables the SHBP to function in low temperature environments where water, which has a higher freezing point, would solidify and not flow in the structure. The refrigerant is usually at a temperature lower or equal to the ambient air which minimizes or even eliminates the heat loss by convection to the surroundings.
References: Reviews, 2009; 13:1211-1229. Journal of Refrigeration, 2003; 26:637-643. 33 No.2, 1984, pp 155-162. pump for hight temperature applications. Applied Thermal Engineering, 2009; 29: 2093-2099. Energy, 2007; 81: 1386-1395. No. ¾, 1998, pp 181-191. Vol. 65 No. 3, 1999, pp 189-196. System. Applied Thermal Engineering, Vol. 21, 2001, pp1049 1065.