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Performance of hydrocarbon mixture in a direct expansion solar assisted heat pump system

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Abstract

The energy performance of a direct expansion solar assisted heat pump system, working with a hydrocarbon mixture (HCM) of R290/R1270, 70:30 (by mass ratio) was investigated. The experiments were carried out at a metrological condition existing near Calicut, India. The experimental system mainly consists of a compressor, condenser, thermostatic expansion valve and evaporator collector. A system simulation technique was used for modelling the system. The experimental results obtained are compared with simulation output of the system working with R22 and a mixture of R290/R1270. The selected alternative working fluid mixture showed better energy performance ratio about 5.8% higher. The parametric analysis of the system working with R22 and a mixture of R290/R1270 is investigated with the help of an established system simulation model. The effect of an evaporator (solar collector) area and solar insolation are found to be the significant influencing parameters on the system performance. Moreover, the new hydrocarbon mixture is found to be a good energy efficient and environmental friendly working fluid to phase out R22 in the solar assisted heat pump systems.

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Abbreviations

A c :

area of collector (m2)

C p a :

specific heat of air (kJ Kg− 1 K− 1)

d f :

dust factor

D :

diameter of the tube (m)

HCM :

hydrocarbon mixture

I t :

total solar Insolation (W m− 2)

ṁ:

mass flow rate (kg s− 1)

P :

compressor power consumption (W)

q c :

condenser heating capacity (W)

q e :

heat absorbed by evaporator (W)

S :

solar Insolation (W m− 2)

T :

temperature (0C)

U w :

wind speed (m s− 1)

U o :

heat transfer coefficient (W m− 2)

W :

width of tube (m)

x :

thickness of insulation (m)

a :

air

amb :

ambient

b ′ :

bottom

c :

condenser

dp :

dew point

e :

evaporator

e ′ :

edge

p :

plate

r :

refrigerant

s :

sky

t ′ :

top

α :

absorptance plate material

δ p :

thickness of plate (m)

λ p :

thermal conductivity plate (W m− 1 K− 1)

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Calicut, Kozhikode, India

    L. Paradeshi, M. Srinivas & S. Jayaraj

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  1. L. Paradeshi
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  2. M. Srinivas
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  3. S. Jayaraj
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Correspondence to L. Paradeshi.

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Paradeshi, L., Srinivas, M. & Jayaraj, S. Performance of hydrocarbon mixture in a direct expansion solar assisted heat pump system. Heat Mass Transfer 55, 965–977 (2019). https://doi.org/10.1007/s00231-018-2475-3

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