Thermal performance of a solar‐assisted heat pump drying system with thermal energy storage tank and heat recovery unit

Abstract

Summary Thermal performance parameters for a solar‐assisted heat pump (SAHP) drying system with underground thermal energy storage (TES) tank and heat recovery unit (HRU) are investigated in this study. The SAHP drying system is made up of a drying unit, a heat pump, flat plate solar collectors, an underground TES tank, and HRU. An analytical model is developed to obtain the performance parameters of the drying system by using the solution of heat transfer problem around the TES tank and energy expressions for other components of the drying system. These parameters are coefficient of performances for the heat pump (COP) and system (COPs), specific moisture evaporation rate (SMER), temperature of water in the TES tank, and energy fractions for energy charging and extraction from the system. A MATLAB program has been prepared using the expressions for the drying system. The obtained results for COP, COPs, and SMER are 5.55, 5.28, and 9.25, respectively, by using wheat mass flow rate of 100 kg h−1, Carnot efficiency of 40%, collector area of 100 m2, and TES tank volume of 300 m3 when the system attains periodic operation duration in fifth year onwards for 10 years of operation. Annual energy saving is 21.4% in comparison with the same system without using HRU for the same input data.

Experimental investigation of a parabolic greenhouse dryer improved with copper oxide nano‐enhanced latent heat thermal energy storage unit

“…Specific energy consumption (SEC) and specific moisture extraction rate (SMER) are two of the most utilized metrics to evaluate the effectiveness of a dehumidificator and can be obtained by using Equations ( 12) and ( 13), respectively 51 :…”

Experiment on waste heat recovery‐assisted heat pump drying of food chips: Performance, economic, and exergoeconomic analyses

“…The average values of the COP for the simple‐HPD with open loop, simple‐HPD with closed‐loop, WHR‐assisted HPD in open, and WHR‐assisted HPD in closed systems were 5.34, 4.25, 5.18, and 3.48, respectively. COP values for closed‐loop are in the literature range; however, COP of open‐loop was a little high as compared to closed‐loop as most of the researchers did the experiment in the closed‐loop (Ismaeel & Yumrutaş, 2020; Shah et al., 2016; Wang et al., 2019).…”

“…Atalay (2019) experimentally investigated the exergoeconomic performance of solar drying and HPD systems separately and found a minimum exergoeconomic factor of 0.514 and 0.045, respectively. Ismaeel and Yumrutaş (2020) investigated the thermal performance of the solar‐assisted HPD with underground energy storage and heat recovery and found the SMER of 9.25 kg/kWh.…”

Tank Wall Thermal Stress Analysis and Risk Prevention and Control of Crude Oil Storage Tank

“…Currently, the storage and transport, and metering of crude oil do not pay much attention to the temperature change and stress state of the crude oil in storage tank [1][2][3]. The accurate metering of crude oil relies on the precision of temperature measurement [4][5][6].…”