Improved Plastic-Al Pipe Based System for Refrigeration of Energy Existed in Urban Sewage

2013 ◽  
Vol 275-277 ◽  
pp. 2436-2440
Author(s):  
Jin Gang Yang ◽  
Jia Fu Xiao
Keyword(s):  
Heat Exchange ◽  
Energy Recovery ◽  
Water Source ◽  
Coefficient Of Performance ◽  
Environment Protection ◽  
Practical Utilization ◽  
Urban Sewage ◽  
Cycle System ◽  
Average Coefficient ◽  
Open Cycle

In order to recover the urban sewage energy ,a lab-scale equipment for the sewage energy recovery based on water source heat pump was developed and researched experimentally .The technique of indirect heat exchange by the plastic-Al pipe to recover the urban sewage energy, i.e., the corrosion of the heat exchanger, laying the foundation for the practical utilization of sewage energy. The experimental results show that the developed system is favorable to the environment protection and energy conservation, satisfying the cooling duty requirement with the average coefficient of performance 4.15 in the open cycle system and the average coefficient of performance 3.64 in the close cycle system.

Experimental Study of Heating-Cooling Combined Ground Source Heat Pump System with Horizontal Ground Heat Exchanger

2011 ◽  
Vol 374-377 ◽  
pp. 398-404 ◽  
Author(s):  
Ying Ning Hu ◽  
Ban Jun Peng ◽  
Shan Shan Hu ◽  
Jun Lin
Keyword(s):  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Pump ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Ground Heat Exchanger ◽  
Pipe Length ◽  
Pump System ◽  
Heat Pump System ◽  
Heating And Cooling

A hot-water and air-conditioning (HWAC) combined ground sourse heat pump(GSHP) system with horizontal ground heat exchanger self-designed and actualized was presented in this paper. The heat transfer performance for the heat exchanger of two different pipe arrangements, three layers and four layers, respectively, was compared. It showed that the heat exchange quantity per pipe length for the pipe arrangement of three layers and four layers are 18.0 W/m and 15.0 W/m. The coefficient of performance (COP) of unit and system could remain 4.8 and 4.2 as GSHP system for heating water, and the COP of heating and cooling combination are up to 8.5 and 7.5, respectively. The power consumption of hot-water in a whole year is 9.0 kwh/t. The economy and feasibility analysis on vertical and horizontal ground heat exchanger were made, which showed that the investment cost per heat exchange quantity of horizontal ground heat exchanger is 51.4% lower than that of the vertical ground heat exchanger, but the occupied area of the former is 7 times larger than the latter's.

Improved µ-Scale Turbine Expander for Energy Recovery

2010 ◽  
Author(s):  
Marcus Keding ◽  
Piotr Dudzinski ◽  
Alexander Reissner ◽  
Stefan Hummel ◽  
Martin Tajmar
Keyword(s):  
High Pressure ◽  
Power Output ◽  
Energy Recovery ◽  
Turbine Blades ◽  
Low Pressure ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Work Recovery ◽  
Micro Power ◽  
Pressure Part

Micro power converters for energy recovery are increasingly important for a number of future applications. The Austrian Institute of Technology (AIT) is presently developing an innovative μ-scale turbine expander for work recovery in transcritical CO2 heat pumps. The main drawback of a lower COP (coefficient of performance) of transcritical CO2 heat pumps compared to conventional heat pump systems can be compensated by utilizing the pressure difference between the high pressure and low pressure part of the pump for work recovery. Work recovery can be realized by substituting the expansion valve between the high and low pressure side by a Pelton turbine with specific two phase flow turbine blades. In order to increase the power output, the generator was integrated into the turbine to reduce the friction losses and hence increase the overall efficiency. An important aspect is that the generator is directly connected with the high pressure part of the turbine. One part of the project is the optimization of the turbine geometry via simulation tools. The paper will give an overview about our microturbine development as well as a comparison of the power output of each turbine generation. Furthermore the present paper discusses a concept that utilizes our microturbine together with a micro combustion module that enables a micro power generator with very high power-to-weight ratios based on green fuels.

Decentralized Feedback Structures of a Vapor Compression Cycle System

2008 ◽  
Author(s):  
Brandon Hencey ◽  
Neera Jain ◽  
Bin Li ◽  
Andrew Alleyne
Keyword(s):  
Multiple Input Multiple Output ◽  
Thermodynamic Cycle ◽  
Coefficient Of Performance ◽  
Vapor Compression ◽  
Input Output ◽  
Single Input Single Output ◽  
Loop Design ◽  
Cycle System ◽  
Vapor Compression Cycle ◽  
Compression Cycle

In vapor compression cycle (VCC) systems, it is desirable to effectively control the thermodynamic cycle. By controlling the thermodynamic states of the refrigerant with an inner-loop, supervisory algorithms can manage critical objectives such as maintaining superheat and maximizing the coefficient of performance, etc. In the HVAC industry, it is generally preferred to tune multiple single-input-single-output (SISO) control inner-loops rather than a single multiple-input-multiple-output (MIMO) control inner-loop. This paper presents a process by which a simplified feedback control structure amenable to a decoupled SISO control loop design may be identified. In particular, the many possible candidate input-output pairs for decentralized control are sorted via a decoupling metric, the relative gain array number. From a reduced set of promising candidate input-output pairs, engineering insight is applied to arrive at the final pairings successfully verified on a refrigeration test stand.

scholarly journals Composite silicone-SAPO-34 foams: experimental characterization for open cycle applications

2019 ◽  
Vol 111 ◽  
pp. 06053 ◽  
Author(s):  
Lucio Bonaccorsi ◽  
Luigi Calabrese ◽  
Stefano De Antonellis ◽  
Angelo Freni ◽  
Cesare Joppolo ◽  
...  
Keyword(s):  
Water Sorption ◽  
Mass Fraction ◽  
Water Adsorption ◽  
Weight Fraction ◽  
Experimental Characterization ◽  
Practical Application ◽  
Cycle System ◽  
Dynamic Vapour Sorption ◽  
Open Cycle ◽  
Typical Process

In this work, novel composite silicone-SAPO-34 foams have been prepared and experimentally characterized for application in desiccant open cycles. Water adsorption isotherms of several samples have been measured by a gravimetric dynamic vapour sorption analyser at 30°C and 70°C up to the relative humidity RH= 75%, representing typical process and regeneration air conditions in desiccant evaporative cooling cycles. Adsorbent foams manufactured with 20%, 40% and 60% weight fraction of SAPO-34 have been compared with the pure SAPO-34 powder. Results highlighted that the prepared foams adsorb a significant amount of water, according to the initial mass fraction of zeolite used in the compound. Moreover, the tested foams exhibited sufficiently fast water sorption rate for practical application in a desiccant open cycle system.

Analysis on Sewage Source Heat Pump Applications in the Building Energy Saving

2012 ◽  
Vol 178-181 ◽  
pp. 135-138
Author(s):  
Xue Ting Liu ◽  
Dong Yang ◽  
Zai Qiang Lou ◽  
Yun Ting Zhang
Keyword(s):  
Energy Saving ◽  
Heat Pump ◽  
Rapid Development ◽  
Water Source ◽  
Building Energy ◽  
Urban Wastewater ◽  
Urban Sewage ◽  
Wastewater Recycling ◽  
Building Energy Saving ◽  
Sewage Source

This paper briefly describes the sewage source heat pump, focuses primarily on water-source heat pump applications in practical project . Sewage source heat pump technology has matured and the rapid development of building energy saving in the promotion and application of energy efficient use of urban sewage system provides a reliable technology to ensure that, with the energy, economic and environmental advantages. Sewage source heat pump technology to urban wastewater recycling, turning waste into treasure,to achieve a sustainable energy development.

Direct Contact Gas-Liquid Heat Exchange for Energy Recovery

1990 ◽  
Vol 112 (3) ◽  
pp. 216-222 ◽  
Author(s):  
James R. Fair
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat Exchange ◽  
Experimental Work ◽  
Direct Contact ◽  
Energy Recovery ◽  
Gas Discharge ◽  
Transfer Data ◽  
Hot Gas ◽  
Liquid Heat

Energy from hot gas discharge streams can be recovered by transfer directly to a coolant liquid in one of several available gas-liquid contacting devices. The design of the device is central to the theme of this paper, and experimental work has verified that the analogy between heat transfer and mass transfer can be used for design purposes. This enables the large amount of available mass transfer data for spray, packed, and tray columns to be used for heat transfer calculations. Recommended methods for designing the several types of gas-liquid contacting device are summarized.

scholarly journals Estimation of coefficient of performance of thermoelectric cooler using a 30 W single-stage type

2021 ◽  
Author(s):  
Rotimi Adedayo Ibikunle ◽  
Mutalubi Aremu Akintunde ◽  
Isaac Femi Titiladunayo ◽  
Adekunle Akanni Adeleke
Keyword(s):  
Heat Exchange ◽  
Electrical Power ◽  
Thermoelectric Module ◽  
Single Stage ◽  
Coefficient Of Performance ◽  
Thermoelectric Cooler ◽  
Cooling Period ◽  
Vegetable Samples ◽  
Cooling Chamber ◽  
Before And After

Abstract In this study, a single stage thermoelectric cooler (TER, of size: 21 × 14.2 × 13.5 cm) with thermoelectric module (TEM, of type inbc1-127. 05 with size 40 × 40 × 4.0 mm) and applied electrical power of 30 W and current of 2.5 A, was adopted to estimate the coefficient of performance (COP) of thermoelectric refrigerator (TER). The TER uses a fan to cool the heat exchange region of the TEM. The temperature of the fruit/vegetable samples used in this study was taken before and after cooling for a specific period. The temperatures at both the hot and cold sides of the TEM were also taken at every specific cooling period. The experimented TER can cool vegetable/fruit from about 27 to 5°C within 3 h. The aim of this study is to determine the COP of TER to ascertain the possible applications. The temperature gradient at the heat exchange section of TEM was used to estimate the average theoretical COP to be 0.99, the heat extracted from the cooling chamber and the power supplied was used to estimate the average practical cooling COP to be 0.52; which is within 0.4–0.7 standard COP for a single stage type of TER.

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