Thursday, 10 March 2016



PE01 and PE02 houses monitored in Previ.
PE03 is a house of an upper middle class family.
PE01 and PE03 are occupied all the time, whereas PE02 only late in the evenings.

·         On the arrival at house PE01 it was a very warm morning. In both houses
·         Thermal sensation observation from researchers is that , at 29 C and 64 RH people did not complain about excessive heat.
·         The tenants believe they can maintain comfort through air movement
·         At the same time, it was noticed that in winter excessive air movement was a source of cold discomfort (two windows in one room on opposite sides, with a leaky window and
·         PE01 and  PE02 did not have any solar gain. The house PE01 was North-South oriented.  PE03 instead is west oriented therefore there is solar gain in the late afternoons.
·         Researchers are noticing some social expectation/construct in energy use:  like the fact that in Lima there is no warm water for hand/dish washing  for houses PE01 and PE02.
·         PE03 was surveyed in the evening and the indoor temperature (28.6 C) was higher than the external temperature (26 C) for a total of 2 degree difference. In addition PE03 had an indoor RH of 70.2 % whereas outdoors was 72%.

The use of energy use for comfort, house PE01 have 3 fans, house PE02 none. PE02 was designed (and still it is) to optimize the cross ventilation. To the point that the tenant does not have a fan (something unusual) and that the inner temperature experienced by the researcher was lower. It was noticed that the interiors of PE02 were also white painted instead of dark colours. In PE03 there were 4 fans whose are turn on all the time of occupied hours during summer and on e
of the users while sleeping in PE03.
·         DHW, is used only to shower (no dishes cleaning, no hands washing) both houses use electric shower. In PE01 the electric shower is used in only in July- August-September, house PE02 they have recently started living there (1 month) and have not made use of electrical shower. PE03 uses an electric tank that is always (during the year) turned on and the residents take 2 or 3 showers a day during summer.
·         Energy is also used for cooking and home appliances in all three houses.
·         Lighting: in all houses almost all bulbs were compact fluorescent. The reason for it is that the occupants were conscious of energy bills.
·         Miscellaneous devices: notably PE01 has a large number of entertainment appliances (7 tv, 11 mobile phones, 5 music players, 2 desk computers, 3 laptops and 3 tablets). House PE02 have very few appliances however most of them were entertainment devices. In all houses there is an average of one TV per adult and mobile phones. Instead the energy for comfort in PE03 was more than one fan per person. PE03 is the only house with tumble dryer even so the is a terrace in the roof.
·         Desirable appliances, house PE01, PE02  and PE03 would like to have appliances in substitution of old ones (not additional appliances). In addition, house PE02 would like to have a washing machine with no dryer due to elevated energy consumption. 

On expenditure
·         PE01 is assumed to be owned. They spend 30% of the house expenditure in energy
·         PE02 is rented. They spend 10% of the household expenditure in energy related bill.
·         The apparent difference could lie in the fact that house PE01 owned and PE02 rented hence the PE02 has more household expenditure in general  and energy covers a smaller proportion.
·         PE01 are paying for the connection to the mains of gas (only 50% of houses in this district are connected to the main gas distribution) (1)
·         PE03 do not opt for behavioural changes to reduce energy.


Focus group Previ residents 24 Feb 2016 - 6 participants / 5 families

PART I: on Previ development

Reasons why they went to live there
·         Lottery
·         Investment
Changes performed to their houses
·         Extensions to
o   Accommodate more family as it grows (2 participants)
o   o invest (rental) (1 participant)
o   No change – cross ventilation maintained (2 participants)
Problems and concerns (to let a politician know)
·         Green areas have little maintenance
·         Crime
·         Seismic security
·         Street lighting
·         Utility provisions (water)  should be modernised
·         Parking spaces are insufficient
·         Private invasion of open areas
What do they like to most (to show to their favourite artist)
·         Very proud of their park
·         Proud of the architectural value of their development

PART II: on energy patterns of use

·         None heating or air conditioning
·         Thermal adaptation through clothing, water drinking, windows/door openings
·         Well understood the importance of cross ventilation
·         No avoidance of solar gain in the houses
·         Avoidance of rain in two houses (which has the effect of control some unintentional shading in windows and roof)
·         Gas only for cooking (one house does not trust the mains connection to gas, for safety concerns)
·         DHW
o   Electric thermal tank (3 cases)
o   Electric shower (2 cases)
·         The use of fans only when too hot
·         All participants have energy saving bulbs

·         All participants spare energy by turning off lights/appliances