Abstract
MIL-101(Cr) and water were applied to adsorption refrigeration technology. MIL-101(Cr) was prepared by hydrothermal synthesis method and characterized by X-ray diffraction patterns (XRD), Fourier transform infrared spectroscopy (FTIR), N2 adsorption–desorption measurement at 77 K, thermal gravimetric analysis (TGA) and scanning electron microscope (SEM). The adsorption isotherms of water vapor on MIL-101(Cr) were investigated by using a gravimetric water sorption analyzer. This study established the basic adsorption cycle mathematical model and used MATLAB/Simulink for the simulation. The control variable method was used to simulate the effect on the cooling capacity and coefficient of performance (COP) when the desorption temperature changed. When the adsorption temperature was 35 °C, the evaporation temperatures were 15 °C and 20 °C, and the amount of water vapor equilibrium adsorption on MIL-101 (Cr), Cooling power per unit adsorbent mass (SCP), and COP were measured by using the adsorption performance test rig on the basis of a new type of powder adsorbent filling method.
Highlights
IntroductionConsiderable research focuses on thermally driven adsorption chillers (TDCs) or adsorption heat pumps (AHPs) because they fully exploit environmentally friendly refrigerants (e.g., water and ethanol) and low-grade thermal energy (e.g., solar energy and industrial waste heat) [1,2,3,4]
At present, considerable research focuses on thermally driven adsorption chillers (TDCs) or adsorption heat pumps (AHPs) because they fully exploit environmentally friendly refrigerants and low-grade thermal energy [1,2,3,4].The traditional work on the application of zeolites-water and silica gel-water in TDCs and AHPs was studied
The wide peak at 3442 cm−1 may be due to the presence of water molecules or acid hydroxyl groups in the synthesized MIL-101 (Cr); The Considerable MIL-101 (Cr)–O vibration peak appeared at 585 cm−1, which further indicates the successful synthesis of MIL-101 (Cr)
Summary
Considerable research focuses on thermally driven adsorption chillers (TDCs) or adsorption heat pumps (AHPs) because they fully exploit environmentally friendly refrigerants (e.g., water and ethanol) and low-grade thermal energy (e.g., solar energy and industrial waste heat) [1,2,3,4]. Many reports about the adsorption characteristics of MOF materials are available [15,16,17,18,19], researchers have only used a gravimetric water sorption analyzer to investigate the adsorption performance, and the application of MIL-101 (Cr)/water to the actual refrigeration test bench to test the adsorption performance is scarce [20,21,22]. The adsorbent’s performance, which will not fully reflect the adsorption properties of the powder adsorbents, is investigated Given these disadvantages, in the present study, MIL-101 (Cr) powder adsorbent was synthesized by hydrothermal synthesis and characterized by X-ray diffraction patterns (XRD), Fourier transform infrared spectroscopy (FTIR), N2 adsorption–desorption measurement at 77 K, thermal gravimetric analysis (TGA), and scanning electron microscope (SEM). The adsorption performance test rig was built on the basis of the liquid level method, and a new type of powder adsorbent filling method was used to experimentally study the adsorption performance of MIL-101 (Cr) powder/water working pair
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