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ABSTRACT
Theoretical model of a solar photovoltaic integrated water-Lithium bromide absorption system is presented for domestic air conditioning. Surplus electrical energy from photovoltaic modules is used for charging the battery, which is utilized during the periods of zero or insufficient solar radiation. Minimum solar area required for each month is calculated and October is identified as the month requiring the highest area of photovoltaic arrays for a constant cooling load of 3.5 kW. The integrated system is found to be capable of sufficient amount of surplus electrical energy generation during both summer and winter months, with a daily excess of about 815 Ah of electrical energy on average over a complete calendar year. Designed system is found to be economically viable, having an energy payback period of 2.7 years.
Nomenclature
| A | = | surface area (m2) |
| DF | = | de-rating factor |
| C | = | cost (USD) |
| Ė | = | power (W) |
| G | = | solar radiation intensity (W m–2) |
| h | = | enthalpy (J kg–1) |
| i | = | rate of interest |
| I | = | current (A) |
| J | = | electrical energy (Ah) |
| = | mass flow rate (kg s–1) | |
| N | = | number of modules |
| p | = | pressure (kg m–1 s–2) |
| Q | = | rate of heat transfer (W) |
| T | = | temperature (K) |
| uF | = | air velocity in fan (m s–1) |
| v | = | specific volume (m3 kg–1) |
| Vair | = | air flow rate (m3/s) |
| Vsystem | = | system voltage (V) |
| Vt | = | module voltage (V) |
| = | rate of work transfer (W) | |
| X | = | mass concentration |
Greek symbols
| = | pressure drop (Pa) | |
| = | effectiveness | |
| = | efficiency |
Subscripts
| a | = | ambient |
| A | = | absorber |
| C | = | condenser |
| = | charge controller | |
| D | = | diode |
| des | = | design |
| E | = | evaporator |
| F | = | fan |
| G | = | generator |
| in | = | initial |
| L | = | light |
| m | = | module |
| P | = | pump |
| p | = | parallel |
| PS | = | power system |
| r | = | refrigerant |
| ref | = | reference |
| s | = | series |
| sc | = | short-circuit |
| ss | = | strong solution |
| tot | = | total |
| ws | = | weak solution |
Acronyms
| Ah | = | ampere hour |
| = | annualized life cycle cost | |
| = | coefficient of performance | |
| = | energy payback time | |
| = | solar photovoltaic | |
| = | vapor absorption refrigeration system |
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