Heat Recovery at Wastewater Treatment Plants Using Heat Pipe Heat Exchangers

مرکز و کتابخانه مطالعات اسلامی به زبان های اروپایی

منو

" Heat Recovery at Wastewater Treatment Plants Using Heat Pipe Heat Exchangers "
MANDIZADEH, MARZIEH Lavine, Adrienne S.; Stenstrom, Michael K.

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	905351
Doc. No	:	TL0ch8b43k
Main Entry	:	MANDIZADEH, MARZIEH
Title & Author	:	Heat Recovery at Wastewater Treatment Plants Using Heat Pipe Heat Exchangers\ MANDIZADEH, MARZIEHLavine, Adrienne S.; Stenstrom, Michael K.
College	:	UCLA
Date	:	2018
student score	:	2018
Abstract	:	An anaerobic digester is a part of a wastewater treatment technology and its role is to digest the wastewaters to treat biosolids. Anaerobic digesters typically operates at either 35ï¿½C to 37ï¿½C or 45ï¿½C, and biosolids must be heated from ambient temperature (10-20ï¿½C). To heat the sludge in anaerobic digesters steam injection is used which dilute the sludge and the requirement of electricity to heat steam is not economically favorable. Conventional heat exchangers have been used in wastewater treatment plants (WWTP) but there are many difficulties regarding the maintenance, clogging and cleaning, which discourages their use, especially for heat recovery. Methane gas (CH4) is produced in digesters which is combusted and used for heating the buildings. In the case of large WWTPs, combusted methane is also used for power generation; but it usually combusted to the air. There are largely unused opportunities for heat recovery and it is not practiced due to the low potential heat recovery as well as maintenance problems with heat exchangers. Heat pipes are an interesting technology and have not been used in WWTPs. In this dissertation heat pipes for wastewater treatment (low temperature heat recovery) and combusted biogas products’ applications are evaluated. Then heat pipe heat exchangers (HPHE) is designed and the simulations of heat pipe heat exchangers (HPHE) for different fluid pairs at Cr<<1 and Cr≈1 is demonstrated and then compared with a conventional heat exchanger (spiral heat exchanger). Then a method to justify when using HPHE is favorable for any design and application is introduced.
Added Entry	:	Lavine, Adrienne S.; Stenstrom, Michael K.
Added Entry	:	UCLA