Analysis of a Heat Pump with Solid Desiccant Tube Bank

Name: Watchararong Tachajapong

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Heat pumps

; Tube banks

; Solid desiccant

Abstract: This study presents analysis of silica gel formed in staggered tube bank arrangement for reduction of energy consumption in a heat pump dryer. Two methods have been considered. In configuration A, moisture is extracted from ambient air by condensing the water at the evaporator then the cold dry air recovers heat at the condenser. The working air entering the dryer is therefore very low humidity. In configuration B, the ambient air is only heated by the condenser and the auxiliary heater before entering the dryer. The evaporator enhances the system performance by recovers heat from the relatively moist and warm air leaving the dryer. For the experimental study, the inlet air conditions are 30-50?C with the relative humidity 50-90% RH and the air flowrates of 1-5 m/s pass through 12 rows of silica gel tubes bank before entering the heat pump system. The mathematical models for the desiccant and the heat pump have been developed. The simulated results agree quite well with those of the experiments. The adsorption process at the desiccant gives higher temperature and lower humidity air entering the heat pump. This reduces load of the heat pump both sensible and latent heat. The energy saving of the heat pump drying is strongly dependent on the input air conditions and the air flowrate. Effect of the use of silica gel increase when the inlet air has high humidity or low temperature with high mass flow rate. For configuration A, the desiccant is not suitable for reducing the energy consumption of heat pump because high regeneration heat of the desiccant is required. For configuration B, at the air flowrate about 3-5 m/s, the desiccant can save the total energy about 5-17%. From the economic consideration with 24 hours a day, in each year the desiccant can save cost up to 4-12 % and the payback period of the unit with the desiccant is about 1.0-1.5 years. Maximum energy saving occurs at the inlet air of 30C and 90% RH with the air flowrate of 4 m/s.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Prof.Dr. Tanongkiat Kiatsiriroat

Role: Supervisor

Created: 2544

Issued: 2006-12-26

Modified: 2006-12-26

วิทยานิพนธ์/Thesis

ISBN: 9746281879

CallNumber: JGSEE1

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Mechanical Engineering

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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