FIGURE 5 - uploaded by Muhammad Sultan
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The Dühring i.e. Pressure-Temperature-Concentration (P-T-W) diagram of (a) activated carbon KOH6-PR / ethanol pair (b) activated carbon Maxsorb III / methanol pair (c) zeolite AQSOA-Z02 / water pair (d) Polymer adsorbent PS-II / water pair (e) silica gel/ water pairs at evaporator and regeneration temperatures of 10 °C and 80 °C, respectively.
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In this study water adsorption onto silica gel are experimentally measured and isotherm data successfully correlated with Guggenheim-Anderson-de Boer (GAB) model. The Silica gel/water pair is compared with four different adsorbent-refrigerant pairs from the literature (i.e. KOH activated phenol resin based activated carbon (KOH6-PR)/ethanol pair, a...
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Context 1
... diagram of each pair is constructed by using the adsorption isotherm parameters and ideal cycle is also overlaid on the same diagram as shown in Figure 5. The ideal cycle in dühring diagram of each pair represents the following process i.e. 1-2 an isosteric heating process (pre-heating), 2-3 isobaric heating (desorption), 3-4 isosteric cooling process (precooling) and 4-1 isobaric cooling process (adsorption). ...
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... 610.7), and represents the surface temperature of the leaf usually measured using an infrared gun for such experiments, but for the sake of simplicity, was assumed to be equal to temperature of the air inside the agricultural greenhouse, represents the relative humidity of the air, and represents the vapor pressure deficit inside the greenhouse in kPa. In addition, adsorption based airconditioning systems are being used for different applications other than greenhouse air-conditioning [20][21]. ...
This study explores evaporative cooling options for greenhouse air-conditioning for the climatic conditions of Multan (Pakistan). Greenhouse requires temperature and humidity control unit to optimize the environment inside the greenhouse for plants. In this regard, three low-cost lab-scale experimental evaporative cooling (EC) systems (i.e. direct EC (DEC), indirect EC (IEC), and Maisotsenko cycle EC (MEC)) were developed. The thermodynamic performance of the developed systems was analyzed from the viewpoints of the temperature gradient, relative humidity, vapor pressure deficit, and wet bulb, and dew point effectiveness. The MEC, DEC, and IEC systems created a temperature gradient of 18-21°C, 20-28°C, 27-31°C at ambient temperature 28-40°C for 15th May for the climatic conditions of Multan. The spatiotemporal evaluation of temperature, relative humidity, and vapor pressure deficit (VPD) revealed that plain areas of Pakistan including Punjab province received severe temperature peaks. Whereas relative humidity peaked in monsoon season across the plain areas. Whereas for VPD, plain areas of Pakistan faced severe peaks in the summer months which can be optimized using the MEC system for greenhouse air-conditioning. Thus, the results conclude the MEC system as an optimum air-conditioning option for greenhouse air-conditioning.
