Approximately up to 20% of input energy is lost in the flue gas. Many industrial, commercial and institutional use of energy results in excessive release of waste heat to the environment. Indirect benefits of heat recovery include reduction in equipment sizes, reduction in pollution, and reduction in auxiliary energy consumption. Hence, heat recovery leads to energy savings and operational cost reduction. Heat recovery technology provides a means to effectively recover waste heat and convert it to useful purposes, thus offsetting the fuel that could have been utilized. Re-use of waste energy such as rejected heat from a thermodynamic system is an energy conservation measure. Storage of food and drying of fabrics make the IRWHRD an option for use in both agricultural development and entrepreneurship development in laundry business. Application potentials therefore exist for use of this dual purpose system for simultaneous production of refrigeration and heating. The system coefficient of performance was estimated to be 10.09 thus indicating that the energy derived from IRWHRD was 10 times the energy it consumed. The energy utilization ratio obtained was 0.92, indicating that 92% of the waste heat recovered was actually utilized. The specific moisture extraction rate of the dryer varied over 0.19–0.22 kg/kW.hr while 150W of cooling was produced at the evaporator in all cases. The maximum drying temperature attained during pre-loading test was 49 ☌ while the evaporator provided cooling at a temperature of 5 ☌. The dryer component was powered by heat dissipated by the condenser piping from the exit of the compressor (superheat region) to the entrance of the sub-cooled region. The refrigerator had a vapour compression cycle driven by environmentally friendly R134a working fluid (refrigerant). The system comprises of a refrigerator with its condenser unit retrofitted to serve as the heat recovery mechanism and a drying chamber. A work on the design and construction of an integrated tetrafluoroethane (R134a) refrigerator-waste heat recovery dryer suitable for use in tropical regions is presented.
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