Experimental analysis of a diesel engine driven water-to-water heat pump

Parise, J. A. R.; Cartwright, W. G.

doi:10.1016/0890-4332(88)90002-6

Cited by 10 publications

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“…Condenser and evaporator are of the shell-and-tube-type, with water flowing in the shell side. Their overall conductances are assumed to be a function of water flow rate, as observed experimentally by Parise (1983). The experimental curves are shown in Figure 2.…”

Section: Description O F the Systemmentioning

confidence: 99%

Performance characteristics of a high temperature water-to-water heat pump

Parise

Cartwright

1988

Int. J. Energy Res.

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A simulation model is utilized to predict the performance of a high temperature water‐to‐water heat pump, running on Refrigerant 11, over a range of evaporator and condenser water temperature (10 to 40°C and 40 to 70°C) and compressor speeds (500 to 3000 r.p.m.). It is shown that heat pump power output can be effectively controlled by varying compressor speed. Effects of compressor speed, heat source and heat sink (end‐use) temperature on the heat pump efficiency are presented. Special attention is devoted to the values of predicted refrigerant temperature at the compressor discharge. These are compared with the thermal limit of the refrigerant. Modifications to the system, to reduce refrigerant maximum temperature, are also discussed.

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Section: Description O F the Systemmentioning

confidence: 99%

Performance characteristics of a high temperature water-to-water heat pump

Parise

Cartwright

1988

Int. J. Energy Res.

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“…Heat transfer zones (superheated vapour, two-phase region, subcooled liquid), each with different heat transfer characteristics and balance equations, are created for the condenser and evaporator (Ellison and Creswick, 1978). Alternatively, in the case of air-cooled condensers and air-source evaporators, the coil can be divided in small tube sections (Parise, 1983), forming a three-dimensional array within the heat exchanger core, or the analysis can be carried out on a tube-by-tube basis (Domanski and Didion, 1983). The local analysis approach can also be applied to the expansion device when a capillary tube is used.…”

Section: Introductionmentioning

confidence: 99%

“…The local analysis approach can also be applied to the expansion device when a capillary tube is used. The compressor simulation can either be derived from a steady-state integral model (Ellison and Creswick, 1978;Domanski and Didion, 1983), taking into account all existing energy flows (particularly important for hermetic compressors) or even consider all transient processes that take place within the cylinder (Parise, 1983), including valve movement and instantaneous pressure and volume variation. The simulation codes from NIST (Domanski and Didion, 1983) and ORNL (Ellison and Creswick, 1978) have been regularly updated (Fischer and Rice, 1981;Dabiri, 1982;Fischer and Rice, 1983;Fischer et al, 1988) and adapted to different applications including binary mixtures (Domanski and Didion, 1985;Domanski, 1986), a water-to-air heat pump (Parent and Larue, 1989), second law analysis (Tsaros et al, 19871, heat pumps with desuperheater (Bong et d., 1988), and window-type air conditioning units (Marques and Melo, 1990).…”

Section: Introductionmentioning

confidence: 99%

Steady-state simulation of vapour-compression heat pumps

Herbas

Berlinck

Uriu

et al. 1993

Int. J. Energy Res.

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A vapour compression simulation model was developed. Simple mathematical models were employed for each component of the cycle. They resulted in a set of nonlinear equations, which was solved numerically. Heat losses from condenser to ambient were included. The model is capable of predicting the operating point of the system (including condensing and evaporating pressures) as a function of equipment characteristics (for example, compressor swept volume, speed and clearance ratio, and heat exchanger overall conductances) and prevailing thermodynamic conditions (such as heat source and heat sink temperatures with the mass flow rates of their fluids). The predicted performance was compared to that of an existing R-12 unit, showing good agreement. As an application, a comparative analysis is made on the thermodynamic performance of a domestic heat pump running on two different refrigerants: R-12 and R-134a.

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“…Experimental results from an existing test rig [9] were employed to analyse, at various condensing and evaporating pressures, the performance of a water chiller unit with direct heat recovery. The plant lay-out is shown in Figure 4.…”

Section: Testing Of a Dffiect Recovery Systemmentioning

confidence: 99%

“…The two models were applied to simulate typical refrigerant plants, with characteristics close to the experimental rig [9).…”

Section: Effect Of Temperatur E Requirement Smentioning

confidence: 99%

Heat recovery from refrigeration plants: Meeting load and temperature requirements

Herbas

Dalvi

Parise

1990

International Journal of Refrigeration

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In refrigeration plants the heat extracted from the refrigerated medium, plus the energy in form of mechanical work from the compressor, is discharged to the atmosphere through the condenser. In the present paper a study is made on the alternatives for recovering this amount of energy to produce hot water, or warm air.A basic thermodynamic analysis is carried out, showing the most appropriate conditions for heat recovery. A simulation model is also employed for the performance prediction of cases where temperature requirements are present. Data from an experimental unit are also presented and compared with predicted results. Tests were performed over a range of condenser and evaporator temperatures.

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Experimental analysis of a diesel engine driven water-to-water heat pump

Cited by 10 publications

References 0 publications

Performance characteristics of a high temperature water-to-water heat pump

Performance characteristics of a high temperature water-to-water heat pump

Steady-state simulation of vapour-compression heat pumps

Heat recovery from refrigeration plants: Meeting load and temperature requirements

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