Performance Study of the Engineering Practice of Urban Sewage Source Heat Pump System

2009 ◽  
Author(s):  
L. Fu ◽  
X. L. Zhao ◽  
J. Z. Zhu ◽  
B. M. Huang ◽  
T. He ◽  
...  
Keyword(s):  
Heat Pump ◽  
Operating Conditions ◽  
Engineering Practice ◽  
Cooling Mode ◽  
Pump System ◽  
Heat Pump System ◽  
Urban Sewage ◽  
Heating And Cooling ◽  
Operation Status ◽  
Sewage Source

As an energy-saving and environmentally friendly technology, the urban sewage source heat pump (USSHP) had been widely applied in the field of heating and air conditioning. Chinese researchers recently designed an urban sewage source heat pump system composed of a filth block device, a wastewater heat exchanger, a heat pump, and other assistant facilities, such as pumps, fans, and end user devices. The system was built in 2008, and has been in operation since then. We tested the parameters of the system on the heating and cooling status from the wastewater source to the heat pump, including the temperature and flux of sewage, the inlet and outlet parameters of different facilities, and the performance of different facilities for a typical operation status. Based on the test results, the overall COP of the system in the heating and cooling mode was computed, and the energy efficiency level was analyzed. Then a method was proposed to improve the system’s performance. After the improvements, the characteristic curves of the typical operation status were investigated. The results indicated that the heating COP is about 4.3, and the cooling COP is about 3.5 in the actual operating conditions. These results could serve as a reference for designing or evaluating urban sewage source heat pump systems.

scholarly journals A Comparative Energy and Economic Analysis between a Low Enthalpy Geothermal Design and Gas, Diesel and Biomass Technologies for a HVAC System Installed in an Office Building

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 870 ◽  
Author(s):  
José Villarino ◽  
Alberto Villarino ◽  
I. de Arteaga ◽  
Roberto Quinteros ◽  
Alejandro Alañón
Keyword(s):  
Heat Pump ◽  
Economic Cost ◽  
Operating Conditions ◽  
Office Building ◽  
Geothermal System ◽  
Environmental Aspects ◽  
Pump System ◽  
Heat Pump System ◽  
Heating And Cooling ◽  
Ground Coupled Heat Pump

This paper presents an analysis of economic and energy between a ground-coupled heat pump system and other available technologies, such as natural gas, biomass, and diesel, providing heating, ventilation, and air conditioning to an office building. All the proposed systems are capable of reaching temperatures of 22 °C/25 °C in heating and cooling modes. EnergyPlus software was used to develop a simulation model and carry out the validation process. The first objective of the paper is the validation of the numerical model developed in EnergyPlus with the experimental results collected from the monitored building to evaluate the system in other operating conditions and to compare it with other available technologies. The second aim of the study is the assessment of the position of the low enthalpy geothermal system proposed versus the rest of the systems, from energy, economic, and environmental aspects. In addition, the annual heating and cooling seasonal energy efficiency ratio (COPsys) of the ground-coupled heat pump (GCHP) shown is higher than the others. The economic results determine a period between 6 and 9 years for the proposed GCHP system to have lower economic cost than the rest of the systems. The results obtained determine that the GCHP proposed system can satisfy the thermal demand in heating and cooling conditions, with optimal environmental values and economic viability.

scholarly journals Field Test Analysis of a Urban Sewage Source Heat Pump System Performance

2017 ◽  
Vol 143 ◽  
pp. 131-136 ◽  
Author(s):  
Qunli Zhang ◽  
Zhiming Wang ◽  
Chaohui Yin ◽  
Qian Nie ◽  
Liwen Jin
Keyword(s):  
Heat Pump ◽  
Field Test ◽  
System Performance ◽  
Test Analysis ◽  
Pump System ◽  
Heat Pump System ◽  
Urban Sewage ◽  
Sewage Source

Characteristics of Fouling in Urban Sewage Source Heat Pump System

2012 ◽  
Vol 446-449 ◽  
pp. 1502-1505
Author(s):  
Cheng Hu Zhang ◽  
Zhi Gang Yang ◽  
De Xing Sun
Keyword(s):  
Thermal Resistance ◽  
Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Urban Sewage ◽  
The Common ◽  
Sewage Source

Abstract—The article describes the growth and thermal resistance characteristics of the debris formation of the urban sewage source heat pump system, and describes the common measures.

Anti-Blocking Technology for Urban Sewage Source Heat Pump System

2012 ◽  
Vol 472-475 ◽  
pp. 637-640
Author(s):  
Cheng Hu Zhang ◽  
Na Meng ◽  
De Xing Sun
Keyword(s):  
Mathematical Model ◽  
Heat Pump ◽  
Design Method ◽  
Pump System ◽  
Heat Pump System ◽  
Urban Sewage ◽  
Heat Utilization ◽  
Distribution Property ◽  
Filtering Effect ◽  
Sewage Source

The extremely poor sewage quality could make the sewage heat utilization difficult. The paper introduces the content and distribution property of the sewage dirt. For the dirt properties and project experience, it proposes the two basic points of the anti-blocking technique in sewage source heat pump system: filtering surface continuous regeneration and dirt continuous reduction and the request for filtering pore size parameters. It also describes the principle of filtering surface hydraulic continuous regenerative technique and establishes its mathematical model and design method of the device. The calculation and application result indicates that filtering surface hydraulic continuous regenerative technique can guarantee the filtering effect and operation flow stable.

Experimental Study on New Sewage Source Heat Pump Unit

2013 ◽  
Vol 316-317 ◽  
pp. 49-52
Author(s):  
Zhi Yi Wang ◽  
Jian Jun Li ◽  
Zu Dong Pan
Keyword(s):  
Heat Pump ◽  
Volume Ratio ◽  
Pump Unit ◽  
Pump System ◽  
Dual Purpose ◽  
Heat Pump System ◽  
Urban Sewage ◽  
Existing Problems ◽  
Heat Pump Unit ◽  
Sewage Source

By the analysis of the current technical conditions and existing problems, some improvements are carried out on the urban sewage source heat pump unit. are as follows: Refrigerants side switch sewage source heat pump system, dual-purpose heat exchange for evaporating and condensing & wastewater can enter the unit directly are of the main features of the improved units. Some important techniques, such as inverter screw compressor and variable compressor inner volume ratio are used to the improved unit at the same time. From the authoritative organization’s test, the improved sewage-source heat pump unit has an excellence performance in the nominal cooling and heating conditions.

Refrigerant Subcooling Correlations for Different Expansion Devices for a Non-Intrusive Charge Indicator

2006 ◽  
Author(s):  
Z. Gao ◽  
V. C. Mei
Keyword(s):  
Heat Pump ◽  
Low Cost ◽  
Heat Pumps ◽  
Air Conditioner ◽  
Cooling Mode ◽  
Pump System ◽  
Air Conditioners ◽  
Heat Pump System ◽  
Heating And Cooling ◽  
Expansion Valve

The most common problems affecting residential and light commercial heating, ventilation, and air-conditioning (HVAC) systems are slow refrigerant leaks. Equipment users are usually not aware of the problem until most of the refrigerant has escaped. A low-cost, non-intrusive refrigerant charge indicator has been developed, based on temperature measurements and correlations formed to interpret the measured temperatures. It can be used to provide real time warnings to the equipment users before the majority of refrigerant is escaped. It could be inexpensive and easy to incorporate into existing heat pumps and air conditioners. Extensive laboratory experimental work was performed on a 2-ton window air conditioner and on a 2.5 ton split heat pump system. It was found that the heat pump was not sensitive to slow refrigerant leak because of the long liquid line. Liquid subcooling was measured to determine the system charge status before a substantial amount of refrigerant was leaked. This study reports the finding of correlations formed for liquid subcooling for the orifice plate and thermal expansion valve used on the heat pump system for both heating and cooling mode operation.

Study on Operation and Parameters of Urban Sewage Source Heat Pump System with Freezing Latent Heat Collection

2011 ◽  
Vol 403-408 ◽  
pp. 3235-3238 ◽  
Author(s):  
Jian Feng Qian
Keyword(s):  
Latent Heat ◽  
Heat Pump ◽  
Temperature Difference ◽  
Heat Load ◽  
Sensible Heat ◽  
Pump System ◽  
Heat Pump System ◽  
Urban Sewage ◽  
Heating Source ◽  
Sewage Source

Urban sewage is a renewable energy source in the fields of heating and air conditioning engineering, and urban sewage source heat pump system plays an important role on energy-saving and environmental protection. According to the differences of the sewage emission coefficient and heat load of the building, it is not able to satisfy the user heating demand only on the limited temperature difference sensible heat on many situations, especially for the sewage rate of flow in small trunk canals. Therefore, a new heat system named urban sewage source heat pump system with freezing latent heat collection is proposed, in which the freezing latent heat is used as the heating source of the heat pump system at peak heat load in winter as well as the temperature difference sensible heat. According to the status, the system form is brought out and the operation modes of this heat pump system are stated, then the characteristics of the design and operating parameters are discussed.

scholarly journals Experimental study of the performance of a vertical and a horizontal ground loops coupled to a ground source heat pump system

2021 ◽  
Author(s):  
Waleed S. Alzahrani
Keyword(s):  
Heat Pump ◽  
Ground Source Heat Pump ◽  
Cooling Mode ◽  
Pump System ◽  
Heat Pump System ◽  
Heating And Cooling ◽  
Ground Source ◽  
Vertical Ground ◽  
Set Up ◽  
Heating Mode

The performance of vertical and horizontal ground loops coupled to a Ground-Source Heat Pump (GSHP) was investigated under four different scenarios. For this purpose, an experimental set-up was designed and constructed at the Archetype Sustainable houses in Vaughan, Ontario, Canada. In the first two tests, the two vertical ground loops coupled to the GSHP were tested in heating, and cooling modes. In heating mode, the GSHP COP ranged between 2.7 and 3.15. In cooling mode, the GSHP performed better than the heating mode with COP range of 3.75 and 5.4. In the last two tests, two scenarios were tested to compare the horizontal and the vertical ground loops in cooling mode. In the first scenario, the ground loop flow was divided equally between the loops and the GSHP overall COP was 5.42. The last test used equal Reynolds number in both loops and the GSHP overall COP was 5.36.

Design and Research on One Avoiding-Clogging Equipment in Untreated Sewage Heat Pump Air Conditioning System

2012 ◽  
Vol 204-208 ◽  
pp. 4378-4383
Author(s):  
Zhi Bin Liu ◽  
Ji Li Zhang ◽  
Liang Dong Ma
Keyword(s):  
Heat Pump ◽  
Air Conditioning ◽  
Control Process ◽  
Pump System ◽  
Air Conditioning System ◽  
Heat Pump System ◽  
Urban Sewage ◽  
Filter Surface ◽  
Untreated Sewage ◽  
Sewage Source

Appling urban untreated sewage as a cool and heat source of the heat pump air conditioning system is considered to be an effective way to develop urban sewage resource and a critical technique to serve the building energy system.Applications of technical difficulties are to solve the jam on sewage dirt to tube of heat exchanger and pipes. The multi-filter surface backwash technology is used to separate the suspended solids from the sewage and clean the dirt on the grille. By describing the filtration technique in the sewage source heat pump system to introduce the principle of operation and control process of the multi-filter surface backwash technology. By using in commercialese, the technology is proved to be feasible and reliability. These methods could serve as a reference for designing and application untreated sewage source heat pump systems.

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