Techno-Economic Investigation of an Integrated Boiler–Solar Water Heating/Cooling System: A Case Study
Abstract
:1. Introduction
2. Materials and Methods
2.1. Case Study
2.2. Heating/Cooling Energy Calculations
2.3. The Area of the Study
2.4. Experimental Set-Up
2.5. Process Performance and Energy Saving
2.6. Economic Analysis
3. Results and Discussion
3.1. Economic Analysis
3.2. Solar Cooling
3.3. CO2 Emission Benefit
3.4. Cost Analysis and Payback Period
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Nomenclature
Qi | Absorbed solar energy (kJ) |
Tam | Ambient temperature (°C) |
Tav | Average annual temperature (°C) |
SIIavg.,d | Average daily solar irradiation intensity (Kwh/m2/day) |
tsun,m | Average monthly number of sunny hours (h) |
Tavg., m | Average monthly temperature (°C) |
COPcooling | Coefficient of performance of the solar cooling absorption cycle |
Pc | Collected power (W), |
Cooling efficiency (%) | |
CCF | Cumulative cash flow |
CDCF | Cumulative discounted cash flow |
DTC | Differential temperature controller |
me | Flow rate of refrigerant (L/s) |
FHR | Heat removal factor |
Qref | Heat removed by refrigerant (kJ) |
Qr | Heat removed from a cold room (kJ) |
HTPM | High temperature profile months |
Iavg | Incident solar irradiation per unit area (W/m2) |
Ti | inlet temperature of the water entering the collector (°C) |
Log mean temperature (K) | |
LTPM | Low temperature profile months |
MTPM | Medium temperature profile months |
Tout | Outlet temperature of water leaving the collector (°C) |
UF-PSC | Overall heat loss coefficient (W/m2K) |
U | Overall heat transfer coefficient (W/(m2K)) |
%Es | Percentage energy saving (%) |
%Echiller | Percentage of energy saving of the chiller (%) |
%η | Percentage thermal performance (%) |
Refrigerant Temperature (°C) | |
Room Temperature (°C) | |
Kcol | Solar collector absorption coefficient |
SII | Solar irradiation intensities (W/m2) |
Cp | Specific heat of the water (J/kg.°C), |
∆h | The enthalpy cooling fluid (kJ/kg) |
A | Total area of the collector (m2). |
Qw | Water flow rate (L/s) |
Water mass flow rate (kg/s) | |
Tw | Water temperature (°C) |
Ws | wind speed (m/s) |
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Building Heat Transfer Parameters | Value (Std. Dev.) |
Absorbance of the building (α) | 0.55 ± 0.05 (1.20) |
Average area of the windows | 3.5 ± 0.05 (0.88) |
Heat capacity of furniture (Cfur) | 2200 ± 20 (0.58) kJ/°C |
Heat transfer coefficient of windows (hc,w) | 45 ± 5 (1.10) kJ/h.m2.°C |
Heat loss coefficient through windows (Wl,win) | 25 ± 5 (2.5) kJ/h.m2.°C |
Internal room diminution (L:W:H) | 12:8:3.5 m |
Insight equipment heating duty (Qin) | 300 ± 30 (1.1) kJ/h |
Internal reflection coefficient (Refin) | 0.65 ± 0.06 (0.09) |
Input to TRNSYS 14.1 program | Value (Std. Dev.) |
Heat capacity of air (Cair) | 2000 ± 20 (1.18) kJ/°C |
Space heat gained- non-radiative (Qgain) | 500 ± 25 (0.88) kJ/h |
Dehumidification coefficient (ωmax) | 0.55 ± 0.05 (0.19) |
Humidification coefficient (ωmin) | 0.25 ± 0.05 (0.11) |
Set point heating Temperature (TSp,C, °C) | 18 ± 0.5 (0.18) |
Set point cooling Temperature (TSp,H, °C) | 27 ± 0.5 (0.18) |
Radiation transmissivity of glass (Tg, °C) | 0.8 |
Wind Speed (Swind, m/s ) | 3.5 ± 0.1 (0.23) |
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Al-Smairan, M.; Shawaqfah, M.; AlMomani, F. Techno-Economic Investigation of an Integrated Boiler–Solar Water Heating/Cooling System: A Case Study. Energies 2021, 14, 1. https://doi.org/10.3390/en14010001
Al-Smairan M, Shawaqfah M, AlMomani F. Techno-Economic Investigation of an Integrated Boiler–Solar Water Heating/Cooling System: A Case Study. Energies. 2021; 14(1):1. https://doi.org/10.3390/en14010001
Chicago/Turabian StyleAl-Smairan, Mohammad, Moayyad Shawaqfah, and Fares AlMomani. 2021. "Techno-Economic Investigation of an Integrated Boiler–Solar Water Heating/Cooling System: A Case Study" Energies 14, no. 1: 1. https://doi.org/10.3390/en14010001