Energy-Saving Analysis and Heat Transfer Performance of Wastewater Source Heat Pump

2014 ◽  
Vol 694 ◽  
pp. 211-217 ◽  
Author(s):  
Ya Xiu Gu ◽  
Tian Wang ◽  
Wei Liu ◽  
Feng Feng Ma
Keyword(s):  
Heat Transfer ◽  
Energy Saving ◽  
Heat Pump ◽  
Air Conditioning ◽  
Wire Mesh ◽  
Low Grade ◽  
Falling Film ◽  
Urban Wastewater ◽  
Air Conditioning System ◽  
Evaporation And Condensation

There is a large potential in the heat loss from the urban wastewater. In all kinds of low-grade heat sources, urban wastewater is gradually widely used because of its advantages such as huge quantities, small variation of temperature, warm in winter and cool in summer, etc. By integrating a heat pump to utilize this heat, the wastewater source heat pump (WWSHP), which is a new water reuse and treatment strategy to tackle the water problems of China and to realize the sustainable development, recovers the heat of wastewater. The WWSHP air conditioning system as residential application can reduce the need of energy systems based on fossil fuel for cooling, heating, and hot water's supply purposes. The system's working principle, classification and the wastewater's characteristic parameters were discussed in this paper. And the scheme of using WWSHP system for central air-conditioning compared with other refrigerating and heating equipments was analyzed in detail. The investigation into COP (Coefficient of Performance) and PER (Primary Energy Ratio) was shown in this paper. Among the four kinds of common air conditioning units, when the loads are same respectively, the WWSHP has the most significant energy-saving effect. Furthermore, mechanism of heat transfer enhancement for falling-film evaporation and condensation surface of tubes packed with wire-mesh is also studied in detail. Theoretical simulation will be carried out for the heat transfer process and the flow of falling-film outside horizontal tubes. Improvement of controlling parameters influenced the evaporation and condensation performance, and then led to an increase in the refrigerating quantity and the COP. Consequently, this WWSHP system has its theoretical significance and promising engineering application potentials for the residential refrigerating and air-conditioning system using low-temperature waste heat source.

Development and Design of Cold Radiation Refrigeration Energy Saving Technology of Comfort Air Conditioning

2014 ◽  
Vol 670-671 ◽  
pp. 968-971
Author(s):  
Mao Ren Li
Keyword(s):  
Heat Transfer ◽  
Energy Saving ◽  
Air Conditioning ◽  
Polymer Composite Material ◽  
Operating Conditions ◽  
Dew Point ◽  
Main Body ◽  
Air Conditioner ◽  
Air Conditioning System ◽  
Technical Requirements

This project is mainly used in the comfort air conditioning system, replacing the conventional indoor air conditioning using fan convection cooling form, directly to the traditional air conditioning evaporator by convection heat transfer to type into the radiation heat transfer form, using modern new polymer composite material as the main body of the evaporator, the refrigerant cycle, in the mature theory of refrigeration the design of conventional air conditioning operating conditions of vapor compression on the overall setting of air conditioning design, exploration and design with the radiation air conditioning system technical requirements, the radiant cooling refrigerant system the data acquisition, development and design of intelligent controller and related problem of air conditioner indoor dew point control, thus the formation of completely based on the prototype structure of energy-saving radiation cooling technology of comfort air conditioning.

Research on Energy-Saving Technology for Salt Solution Heat Pump Evaporators

2013 ◽  
Vol 331 ◽  
pp. 216-221
Author(s):  
Tian Lan Yu ◽  
Tian Xiang Yu ◽  
De Qi Peng ◽  
Li Chen ◽  
Xiu Yan Feng ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Saving ◽  
Heat Pump ◽  
Salt Solution ◽  
Pump Energy ◽  
Stable Operation ◽  
Falling Film ◽  
Film Evaporator ◽  
Evaporation Energy ◽  
Theoretical Analyses

Aiming at increasing the energy-saving efficiency of salt solution evaporation, the effect of several factors on heat pump energy-saving efficiency is studied through theoretical analyses and calculation. The factors include boiling point elevation caused by solution static pressure, superheat loss of surface evaporation, temperature difference loss caused by fouling. The conclusions are that falling-film evaporator helps improve heat pump evaporation energy-saving the most and forms the fluctuating flow of the falling film which can be used to remove fouling automatically. The Φ38mm×2mm single-tube dynamics experiment results show that the flow can produce stable 3D vibration of the cleaning spiral when the nominal flow velocity is more than 0.25m/s. The axial reciprocating motion distance is longer than one spiral pitch and reciprocating periodicity is 3-6 seconds. The sodium carbonate solution fouling removal experiment results show that the salt fouling decreases the overall heat transfer coefficient by 30% in one hour when there is no the 3D vibrating spiral-insert; and the insert can enhance heat transfer by 59% comparing to that during stable operation without this technology. Key Words: Falling-film Evaporator, Heat Pump Evaporate, Energy saving, Automatic cleaning, Heat transfer

Some Villas Solar Heating and Air Conditioning System Design of Double-Source Heat Pump Programmer

2012 ◽  
Vol 512-515 ◽  
pp. 168-171
Author(s):  
Wei Yu ◽  
Feng Chen ◽  
Hong Bo Li
Keyword(s):  
Energy Saving ◽  
Heat Pump ◽  
Air Conditioning ◽  
Heating System ◽  
Time Sharing ◽  
Geothermal Heat ◽  
Air Conditioning System ◽  
Geothermal Heat Pump ◽  
Air Conditioning Systems ◽  
Building Heat

This article on a villas in Langfang city, Hebei province, heating and air conditioning systems. According to the owners of the double requirement of energy saving and environmental protection to owners selection of solar energy and geothermal heat pump heating system combined. To better achieve heating and air conditioning energy saving operation of villas, the system can be run by optimizing the control scheme, time-sharing partition building heat adjustment.

Comparison and Selection of HVAC Schemes for Weihai Baidu City

2011 ◽  
Vol 374-377 ◽  
pp. 681-684
Author(s):  
Yan Peng Wu ◽  
Hai Shan Xia
Keyword(s):  
Energy Efficiency ◽  
Energy Saving ◽  
Heat Pump ◽  
Air Conditioning ◽  
Second Phase ◽  
Air Conditioning System ◽  
Air Source Heat Pump ◽  
Pipe Networks ◽  
Time Part ◽  
Selection Of

The second phase of Weihai Baidu City project plans to become a three-star certificated program which is labled by China’s enviromental building evaluation. Heating and ventilated air conditioning program is one of the most important aspects in evaluation of energy saving. Feasibility study on GSHP, GWHP, air-source heat pump, seawater source heat pump were carried out, it’s confirmed that the most energy-saving and reliable way is that using municipal pipe networks for heating in winter and using split air conditioning or multi-connected air-conditioning system in summer. Summer air-conditioning adopts the new idea “part of time, part of space", representative the latest concept of energy efficiency in buildings in China.

Study on the Energy Saving Control of Groundwater Source Heat Pump Air Conditioning System Based on Integrated Optimization Viewpoint

2011 ◽  
Vol 217-218 ◽  
pp. 202-205
Author(s):  
Zhi Wei Wang ◽  
Lei Shi ◽  
Peng Li ◽  
Wei Cao
Keyword(s):  
Energy Saving ◽  
Heat Pump ◽  
Air Conditioning ◽  
Field Investigation ◽  
Air Conditioning System ◽  
Energy Saving Potential ◽  
System Energy ◽  
Groundwater Source ◽  
Water Pumps ◽  
Energy Saving Control

For an actual project of groundwater source heat pump air conditioning system in Yangli region, by the field investigation on energy usage status of the system operation, analyzes the causes of non-energy-saving operation such as water pumps energy consumption too much, presents an intelligent control strategy of the system energy saving operation for solving the problem, performs the program design of energy saving control based on Programmable Logic Controller (PLC) and variable frequency technique, finally predicts the system energy saving potential.

Calculation on Energy Saving Potential of a New Dry-Type Air-Conditioning System

2013 ◽  
Vol 756-759 ◽  
pp. 4388-4393
Author(s):  
Xiao Wei Hu ◽  
Yu Feng Zhang ◽  
Li Li Wei ◽  
Xin Hui Wu
Keyword(s):  
Energy Efficiency ◽  
Energy Saving ◽  
Heat Pump ◽  
Air Conditioning ◽  
Type System ◽  
Operating Conditions ◽  
Combined System ◽  
Air Conditioning System ◽  
Efficiency Comparison ◽  
Conventional Cooling

Temperature and humidity independent control can be made by a new dry-type air-conditioning system, the combination of silica gel rotor and heat pump. Heat pump cycle can simultaneously cool the process air and heat the regeneration air, so it can cancel each other out in the cold and heat energy consumption within the system. This novel form of system not only solves the regeneration energy issues fundamentally but also avoids energy waste by reheating in conventional cooling dehumidification air-conditioning system. Based on the establishment of the component model, MATLAB program has been compiled to simulate the combined system running at nominal operating conditions and calculate the performance parameters and energy efficiency. Comparison of the energy efficiency was made of this dry-type air-conditioning system with ones of other regeneration desiccant wheel air conditioning system and conventional cooling dehumidification air-conditioning system, the results of which show that the new dry-type system provided regeneration energy, overcomes the restriction from climate, region and using conditions of other regeneration. Moreover, compared with conventional re-heat air-conditioning system, its energy saving is up to 35.1% and the energy efficiency is increased by 38.1%.

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