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3. System efficiency evaluation The efficiency of the system can be determined using two factors: the coefficient of performance COP and the specific cooling capacity SCP. COP is the ratio of heat taken from the space to be cooled during evaporation of the refrigerant to the amount of heat delivered to the system for heating and desorption [2, 23] COP= Qp (1) Qd +Qo COP is highly dependent on the temperature of a heat source: the higher the temperature, the greater the COP value. However, above a certain temperature changes are small. The specific cooling capacity SCP is defined as cooling capacity per kg of the adsorbent [14] S C P = Wm L ( 2 ) a SCP takes the mass of the adsorbent and the cooling power of the device into account, so it indicates the compactness of the system [24]. The greater the SCP value, the more compact the device. The value of SCP may be increased by the enhancement of external and internal heat transfer in the adsorber [11]. 4. Advanced adsorption cooling cycles Due to the low efficiency and intermittent work of the basic or single-bed cycle [10, 16] shown in Fig. 2, many more advanced cycles have been developed. These are primarily heat recovery cycle and heat and mass recovery cycle, in which the system of two or more beds is used. Other advanced cycles are thermal wave cycle, convective thermal wave cycle, cascading cycle etc. [10, 16]. In the heat recovery cycle [10, 16], heat from the desorber to be cooled is passed by the heating medium to the adsorber to be heated. With the heat recovery COP can be increased by 25% [16]. The heat and mass recovery cycle [10, 16] is comprised of two steps: mass recovery and heat recovery. In the mass recovery step, when temperature and pressure in a desorber are maximal (point C in Fig. 2) and temperature and pressure in the adsorber are minimal (point A) the desorber and adsorber are connected by the valve. Adsorbate vapour flows from the desorber to the adsorber. Pressure in the desorber decreases and further desorption occurs, while pressure in the adsorber rises, which enables more adsorbate to be adsorbed. The mass recovery is maintained until pressures in the two beds are equal. After mass recovery, the heat recovery process can be applied because of a large temperature difference between the adsorber and desorber. The mass and heat recovery cycle is expected to improve not only COP but also SCP [10]. When this advanced cycle is implemented, the ability of an adsorption cooling system to use low-temperature heat sources increases [10]. 65PDF Image | ADSORPTION COOLING AS WASTE HEAT UTILIZATION
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