heat pump drying systems

... improved properties Three drying methods have been in use, such as heat pump drying, freeze drying and vacuum drying, to maintain quality and retain nutrients Air Condenser Drying Expansion Valve ... different location, the drying temperature and relative humidity can be controlled independently in a heat pump dryer Currently, the maximum drying temperature in a heat pump assisted drying is limited ... atmosphere heat pump drying In order to provide a better understanding and have a clearer insight, the objective of this project is to investigate the drying kinetics of modified atmosphere heat pump...

Ngày tải lên: 06/10/2015, 21:07

... control the drying gas temperature and humidity 1.3 Heat Pump Drying Heat pump would be an attractive option to overcome the difficulties of the solar drying system For drying, heat pumps possess ... LIST OF TABLES xv CHAPTER INTRODUCTION 1.1 Open Air Sun Drying 1.2 Indirect Solar Drying 1.3 Heat Pump Drying 1.4 Solar Assisted Heat Pump Drying CHAPTER LITERATURE REVIEW CHAPTER EXPERIMENTS 17 ... or over dried Heat pump is known to be energy efficient when used in conjunction with drying operations The principle advantages of heat pump dryers emerge from the ability of heat pumps to recover...

Ngày tải lên: 28/11/2015, 13:43

... Nations (Tổ ch c Lươ ường ươ đối c a không khí c Nông nghiệp Liên Hiệp Quốc) HL H ượng HPD Heat Pump Drying (Sấ bơ IBMK Iso-Butyl Methyl Ketone KN Kh o nghiệm MA Modified Atmosphere (Đ ều bi n ... “Nghiên cứu công nghệ bảo quản chè đen phương pháp MAHPD" bao g m ng d pháp sấy bơ ườ ệt (HPD: Heat Pump Drying) để sấ đ ều bi n khí (MA: Modified Atmosphere) ươ b o qu n chè môi Mục tiêu nghiên cứu...

Ngày tải lên: 02/07/2016, 08:26

... unique property of CO2 is the high working pressure required to use under typical heat pump conditions Heat pump systems, both sub and transcritical, using CO2, work at greater pressures than with ... heat pump s model Figure shows the heat pump s vapour / transcritical CO2 compression cycle flow chart The working fluid moves from the evaporator, which is connected to the low-temperature heat ... compression systems Progress Energy Combustion Science 2004, 30(2), 119-174 [6] Sarkar, J., Bhattacharyya, S., Ramgopal, M Transcritical CO2 heat pump systems: Exergy analysis including heat transfer...

Ngày tải lên: 09/09/2015, 10:17

... heat pump system for cooling, water heating and drying 14 Chapter Literature Review that uncovered collector heat pump systems have better performance than both conventional air-source heat pumps ... confectionery and ceramics Different methods of drying have been reported including solar drying, heat pump drying, drying by superheated steam and microwave convection drying There are numerous studies of ... the 3-in-1 solar assisted -heat pump system for air-conditioning, water heating and drying Further An integrated solar heat pump system for cooling, water heating and drying 24 Chapter Literature...

Ngày tải lên: 14/09/2015, 08:37

... heat reservoir Brayton, Otto, Diesel, Atkinson, Dual, Miller and Carnot heat pump cycles Cycle model An irreversible universal variable-temperature heat reservoir heat pump cycle model with heat- resistance ... = Moreover, heat conductance distributions are set as uH = and uL = for Brayton, Otto, Diesel and Atkinson heat pump cycles; uL = for Dual heat pump cycle; uH = for Miller heat pump cycle, respectively ... Miller heat pump cycle becomes Atkinson heat pump cycle Figure show the optimal heat conductance distribution ( uH 2,opt ,Π ) versus COP ( β ) for Brayton, Otto, Diesel and Atkinson heat pump cycles...

Ngày tải lên: 05/09/2013, 15:28

... of heating capacity these units require auxiliary electric heaters Water Source Heat Pump The water source heat pump exchanges heat between water and the inside air The water source heat pump ... Ground Source Heat Pump (GeoSource) The GeoSource heat pump utilizes the earth as the medium from which heat is extracted Water is pumped through a heat exchanger in the heat pump Heat is extracted, ... Hot Water Heating (Desuperheater) Domestic hot water heating using a heat pump can significantly decrease energy costs during both heating and cooling seasons A desuperheater is a heat exchanger...

Ngày tải lên: 16/02/2014, 08:20

... using energy storage systems [35] 2.2 Solar Assisted Heat Pump( SAHP) Systems The heat pump is a useful device in transforming low-grade heat into a usable energy source Heat pumps can use many ... ceramics [52] Different methods of drying have been reported including solar drying, heat pump drying, drying by superheated steam and microwave convection drying There are numerous studies of ... industrial use, such as water heating, desalination, solar drying, space cooling, space heating and refrigeration Unlike thermosyphon solar water heaters, solar heat pump systems offer opportunity...

Ngày tải lên: 10/09/2015, 15:47

... Vapor Refrigeration and Heat Pump Systems 206 8.50 Vapor Refrigeration Systems 207 8.60 Analyzing Vapor-Compression Refrigeration Systems 209 8.70 Vapor-Compression Heat Pump Systems 217 8.80 Working ... Refrigeration Systems 185 Vapor Power Systems 185 8.10 Modeling Vapor Power Systems 185 8.20 Analyzing Vapor Power Systems Rankine Cycle 187 8.30 Improving Performance—Superheat and Reheat 198 8.40 ... 1.16 Your car contains various fans or pumps, including the radiator fan, the heater fan, the water pump, the power steering pump, and the windshield washer pump Obtain approximate values for the...

Ngày tải lên: 02/04/2014, 16:45

... balance as shown in Eq (26) Qg,HeX is the heat energy transferred by the heat exchanger to the thermoelectric materials and the insulation Cp is the specific heat _ capacity of gas, and m is the exhaust ... increases the heat transfer rate through the TEMs with increased power generation; however, the power output saturates at higher flow rates due to heat transfer limitations of the heat exchanger ... orders of magnitude of the heat leakage due to radiation and the thermal insulation are very low as compared with conduction losses, hence most of the heat transferred by the heat exchanger flows through...

Ngày tải lên: 06/05/2014, 08:54

... thermoelectric modules, heat exchanger placement, and exhaust flow direction through the thermoelectric generators Thermoelectric Generators for Automotive Waste Heat Recovery Systems Part II: Parametric ... (%) Sku Sku (Hex Opt.) Hyb Hyb (Hex Opt.) 5.37 6.22 6.32 6.98 gHeat with Tref = 100°C Optimization of the heat exchanger enhances the heat transfer through the TEMs by 7% to 8% and hence increases ... for the average inlet conditions with optimized heat exchanger configurations The Thermoelectric Generators for Automotive Waste Heat Recovery Systems Part II: Parametric Evaluation and Topological...

Ngày tải lên: 06/05/2014, 08:54

... thermoelectric modules, heat exchanger placement, and exhaust flow direction through the thermoelectric generators Thermoelectric Generators for Automotive Waste Heat Recovery Systems Part II: Parametric ... (%) Sku Sku (Hex Opt.) Hyb Hyb (Hex Opt.) 5.37 6.22 6.32 6.98 gHeat with Tref = 100°C Optimization of the heat exchanger enhances the heat transfer through the TEMs by 7% to 8% and hence increases ... for the average inlet conditions with optimized heat exchanger configurations The Thermoelectric Generators for Automotive Waste Heat Recovery Systems Part II: Parametric Evaluation and Topological...

Ngày tải lên: 06/05/2014, 08:58

... required for heat flow to occur and the heat flux is given by Fourier’s heat law In the latter, a body may lose or gain heat without the need of a transport medium, the transfer of heat taking ... Methods for Heat Transfer Simulation Fast BEM Based Methods for Heat Transfer Simulation 211 studied turbulent heat transfer behaviour of nanofluid in a circular tube, heated under constant heat flux ... convection is not responsible for transferring the heat Therefore, radiation brings heat to our planet Heat excites the black surface of the vanes more than it heats the white surface Black is a good absorber...

Ngày tải lên: 20/06/2014, 01:20

... Part IX Heat Transfer in Micro Systems Chapter Integrated Approach for Heat Transfer in Fluidized Bed Reactors Zeeshan Nawaz, Shahid Naveed, Naveed Ramzan and Fei Wei Chapter Two-Phase Heat Transfer ... (endothermic/exothermic), while fine particles serve as a heat carrier /heat absorbent For an endothermic reaction: the fine catalyst particles take heat from regenerator, transfer heat to principal catalyst (coarse ... 1 (15) (16) 22 Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems Heat transfer correlations in this chapter The comparison of convective heat transfer coefficients...

Ngày tải lên: 20/06/2014, 06:20

... Transmits heat to the Heat Sink; • Heat Spreader: -Evens out heat spot; -Spreads heat horizontally; -Protects the die; • TIM – Transmit heat to the spreader; • Die: -Heat generation; -Hot spot; The Heat ... for further enhancement of boiling heat transfer to cool high -heat- flux devices Fig Schematic of boiling heat transfer phenomena of micro-pin-fins at high heat flux near CHF Experimental apparatus ... the high heat flux region of nucleate boiling The heat flux q was obtained from the voltage drop of the test chip and the electric current In order to prevent real heater burnout, an overheating...

Ngày tải lên: 20/06/2014, 06:20

... devices, micro heat exchangers, micro valves and pumps, and lab-on-chips, more studies have been 80 Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems dedicated ... field in the cooling assembly – view towards the heat sink obtained by Mihai Fig 33 Thermal modelling of the heat exchange for the CPU die – Heat Sink assembly (Meijer, 2009) Conclusions Considering ... high performance, ultra thin heat sink for electronics, International Journal of Heat and Fluid Flow, Volume 31, Issue 4, (August 2010), 586-598, ISSN 0142-727X 76 Heat Transfer - Theoretical...

Ngày tải lên: 20/06/2014, 06:20

... a uniform heat generation along the wall can be obtained However, the heater may have an uncontrollable heat loss at different locations such that the some of heat generated in the heater may ... a large amount of heat loss from the inside channel to the outside ambient, a uniform heat flux boundary condition on the heated wall could not be maintained Therefore, local heat transfer information ... conductivity Thus, in order to effectively reduce the heat loss and maintain a uniform heat Microchannel Heat Transfer 121 flux boundary condition on the heated wall, several alternatives can be selected...

Ngày tải lên: 20/06/2014, 06:20

... analysis of a micro heat pipe, Heat Pipes and Capillary Pumped Loops, ASME, HTD, Vol 236, pp.19-30 Kim, C J., Kim, J Y., and Sridharan, B (1998) Comparative evaluation of drying techniques for ... pressure drop and heat transfer in a single-phase micro-channel heat sink, International Journal of Heat and Mass Transfer, Vol 45, pp.2549-2565 Qu, W and Mudawar, I (2003a) Flow boiling heat transfer ... Journal of Heat and Mass Transfer, Vol 50, pp.4297-4310 156 Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems Webb, R L and Zhang, M (1998) Heat transfer...

Ngày tải lên: 20/06/2014, 06:20

... total heat flux input provided the heat flux to the liquid and the transient mean heat transfer coefficient 222 Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems ... simultaneously used as a resistance heater and a resistance thermometer to measure the temperature of the heater surface The heater resistance, and thus the heater temperature, was kept constant ... The heat flux at the collapse point is as much as 10 GW/m2, however, the heat flow rate is about mW 204 Heat Transfer - Theoretical Analysis, Experimental Investigations and Industrial Systems...

Ngày tải lên: 20/06/2014, 06:20