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Transcript

Aim of the experiment

Calculations carried out

1. Q_1 -Heat delivered to cooling water from compressor:

2. Q_2- Heat delivered to condenser cooling water:

3. Coefficient of performance for the heat delivered to the conductor only:

4. Coefficient of performance due to total heat delivered to water, including waste heat from compressor cooling coil:

To determine the power input, heat output and coefficient of performance of the heat pump.

To determine the production of heat pump performance curves over a range of source and delivery temperature.

To compare coefficient of performance of both the air and the water evaporator.

Introduction

Tabulated values

Graphs

A heat pump is a device which allows transport of heat from a lower temperature level to a higher one, by using external energy (European Renewable Energy Council, 2008).

The air and water heat pump being used in the experiment relies on the vapour compression cycle which need a small work input to transfer heat from either air or water source evaporator to a water cooled condenser.

Air Evaporator

Vapor Compression Cycle (Setup)

How does a heat pump work?

Water Evaporator

  • The compressor compresses the refrigerant into a slightly superheated vapour at low pressure.

  • The condenser then desuperheats the vapour to form a high pressure liquid.

  • Through the expansion valve, the pressure of the liquid decreases and some liquid is converted into vapour.

  • In the evaporator, due to heat transfer, the remaining liquid is converted into vapour.

  • The refrigerant is then sent back to the compressor to begin the cycle over again.

Overview

Air and Water Heat Pump Experiment

Coefficient of Performance

  • Introduction
  • How does a heat pump work?
  • Aim of experiment
  • Calculations
  • Tabulated values
  • Graphs
  • Why do we need to measure CoP?
  • Analysis & Sensitivity analysis
  • Applications
  • Safety precautions
  • Conclusion
  • References

BEng (Hons) Mechanical Engineering (Minor: Energy Systems)

Thermodynamics (MECH 1013 Y)

Why do we need to measure CoP?

Graph of Coefficient of Performance

Coefficient of performance may be used as a measure of efficiency for a heat pump.

Higher CoPs equate to lower operating costs.

Given the same energy source and operating conditions, a higher CoP heat pump will consume less purchased energy than one with a lower CoP.

Experimenters’s names:

Bhekhun Teshant (1315591)

Kissoon Vidur Doorgesh (1315340)

HOSANY Beebee Hamnah (1312661)

HOSSENBACCUS Mohammad Zoheb (1314610)

Visram Ashwan (1311296)

Toshinath Bissessur (1314486)

Conclusion

Experiment No 3

Analysis

Applications

This experiment, enhances our knowledge on the concept of how heat can actually move from a region of low temperature to that of a higher one due to work done. Thus, this experiment simplified the understanding of part of the second law of thermodynamics, more precisely, the Carnot cycle.

From the above given information, it can be deduced that a water evaporator heat pump is more “efficient” than an air evaporator heat pump, due to the high value of coefficient of performance of approximately 3.8 compared to the air evaporator which has a coefficient of performance of approximately 0.8.

  • Heat pumps are used for many purposes in countless industrial, commercial and domestic activities.

  • The major uses of heat pumps are in the form of refrigerators and air conditioners.

  • Other applications include home heating in cooler climates, pool heaters and so on.

Safety Precautions

Sensitivity Analysis

  • The system should be ensured to be stable before any reading is taken.

  • The pressure gauge should not be allowed to exceed 1400kN/m2. (The apparatus will switch off automatically)

  • The electrical panel linked with the heat pump should be grounded. Any error in installation may cause a fire, electric shock or injury.

  • A safe distance should be maintained from the air evaporator fan.

  • An adequate copper wiring and circuit breaker should be used.

Air Evaporator

Sensitivity analysis for this experiment shows that for both types of evaporators, variations in T7 have the most prominent influence on the outcome (Coefficient of performance) compared to variations of mass flow rate and T6.

Water Evaporator

Air and Water Heat Pump

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