posted by .

a) Family Smith has already installed PV in their house. Now, they also want to cover their needs for warm water with solar energy. For this, they consider having a solar thermal water heating system. Considering that the need for warm water is 100L/day, the water has to be heated from 10 to 60ÂșC and the specific heat capacity of liquid water is 4.18 J/gK.

What is the total energy, in Wh/day, that the system will need to supply to cover the warm water demand?

b) Considering an efficiency of 70% and an irradiance of 1000W/m2 for 3 equivalent sun hours, how much collector area, in m2, will be needed to cover the demand?

c) If only half of the hot water needed has to be stored, at least how big, in L, should the storage tank be?

d) The cost per m2 of collector is estimated as 120 Euros, and the extra costs for water tank and piping are 6 Euros per L of storage. How much will the whole system cost?

e) However, Mr Smith has read an article in the newspaper in which it was claimed that at the moment it is more expensive to install a solar thermal system for water heating than directly using the PV electricity to heat up water. Therefore, he wants to make some calculations to check such assessement. If the price for Wp of a PV panel is 1 Euro and the external costs are 400 Euros, and considering an efficiency of electricity to heat conversion of 85%, how much (in Euros) will it cost to cover the same amount of energy with PV technology?

f) Assume that the lifetime of both systems is 20 years and the maintenance costs are also equal for both cases. Which will be the better choice for water heating?

1)Solar thermal system
2)Photovoltaic system
3)Both systems are equally good

a:5805.36
b:2.76
c:50
d:631.2

Thanx, Can you also give out the rest??

f) Solar thermal system

e: 2674.5

a)900

Someone know the answer or at least the explanation of e?

## Similar Questions

1. ### English

A: What do you think of a solar house. 1. I think the solar house makes money for us. 2. I think we can save energy thanks to the solar house. 3. I think we don't need to spend money on electricity. 4. I think we don't need to pay …
2. ### science

The average solar radiation incident on the surface of the earth is about 1 KW/m2 for the entire year. A solar house is built with solar panels installed in the roof to provide the heating and electrical energy of the house. If the …
3. ### physics

In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water …
4. ### physics

In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water …
5. ### physics

In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water …
6. ### Phyics

In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water …
7. ### Science

Family Smith is interested in buying a solar energy system. After some search on internet they have found two different systems that they are considering. System A is a PV system based on multicrystalline silicon solar cells and System …
8. ### Physics

a) Family Smith has already installed PV in their house. Now, they also want to cover their needs for warm water with solar energy. For this, they consider having a solar thermal water heating system. Considering that the need for …
9. ### Science

I really need help in Science. Right now in science we are doing renewable energy. For the assignment we have two choices, a house or car of the future, I decided to do a house. The question is, "How could renewable energy sources …
10. ### Physical Science

Fill in the blanks using the correct term from the list below. Active Combustion free heating systems passive heat pump thermal energy stroke 1. A house with large windows on its south side and few windows on its other sides probably …

More Similar Questions