Energy - Revision history

RichardWSmith: /* Demand */ Added link.

2024-09-03T23:56:27Z

Demand: Added link.

RichardWSmith: Discuss using artificial light to grow food.

2024-09-03T23:51:01Z

Discuss using artificial light to grow food.

RichardWSmith: Fixed formatting.

2024-09-03T23:41:14Z

Fixed formatting.

RichardWSmith: /* Demand */

2024-09-03T23:40:15Z

Demand

RichardWSmith: /* Demand */ Added industry to table. Currently it takes very little power.

2024-09-03T23:39:03Z

Demand: Added industry to table. Currently it takes very little power.

RichardWSmith: /* Solar photovoltaics */ Fixed typo

2024-09-03T23:35:44Z

Solar photovoltaics: Fixed typo

RichardWSmith: /* Solar photovoltaics */ Add link to flow batteries.

2024-09-03T23:34:28Z

Solar photovoltaics: Add link to flow batteries.

RichardWSmith: /* Geothermal */ May gain liquid water inexpensively

2024-09-03T23:32:57Z

Geothermal: May gain liquid water inexpensively

RichardWSmith: /* Nuclear */ --> Night & process heat.

2024-09-03T23:31:19Z

Nuclear: --> Night & process heat.

RichardWSmith: /* Nuclear */

2024-09-03T23:29:48Z

Nuclear

@@ Line 73: / Line 73: @@
 Depending on the energy source, the hourly demand may vary widely.  For nuclear energy, it makes sense to keep the load as equal as possible, so fuel production and food production would likely be continuous ,with grow rooms spreading out the production periods over 24 hours, and the power supply might be close to the average of 60 MW.  For an entirely solar powered settlement, the opposite would happen, and food production as well as fuel production would stop during the night.  Therefore these values would have to be doubled during the day, and power might swing from a peak of 120 MW to a low of 6 MW, or about 5% of the peak power.
-The assumption that we will use 100% artificial lighting deserves comment.  The sunlight on Mars is like a dim day on Earth, which is enough light to grow crops.  However, importing glass, building the greenhouses, and heating them, is difficult and takes a lot of power.  Providing radiation protection is difficult, (we could have dirt above, and side light the green house with mirrors).  For this page, we are assuming that the food is grown underground using artificial light.
+The assumption that we will use 100% artificial lighting deserves comment.  The sunlight on Mars is like a dim day on Earth, which is enough light to grow crops.  However, importing glass, building the [[Greenhouse | greenhouses]], and heating them, is difficult and takes a lot of power.  Providing radiation protection is difficult, (we could have dirt above, and side light the green house with mirrors).  For this page, we are assuming that the food is grown underground using artificial light.
 ==Sources==

← Older revision		Revision as of 23:51, 3 September 2024
Line 72:		Line 72:

	Depending on the energy source, the hourly demand may vary widely. For nuclear energy, it makes sense to keep the load as equal as possible, so fuel production and food production would likely be continuous ,with grow rooms spreading out the production periods over 24 hours, and the power supply might be close to the average of 60 MW. For an entirely solar powered settlement, the opposite would happen, and food production as well as fuel production would stop during the night. Therefore these values would have to be doubled during the day, and power might swing from a peak of 120 MW to a low of 6 MW, or about 5% of the peak power.		Depending on the energy source, the hourly demand may vary widely. For nuclear energy, it makes sense to keep the load as equal as possible, so fuel production and food production would likely be continuous ,with grow rooms spreading out the production periods over 24 hours, and the power supply might be close to the average of 60 MW. For an entirely solar powered settlement, the opposite would happen, and food production as well as fuel production would stop during the night. Therefore these values would have to be doubled during the day, and power might swing from a peak of 120 MW to a low of 6 MW, or about 5% of the peak power.
		+
		+	The assumption that we will use 100% artificial lighting deserves comment. The sunlight on Mars is like a dim day on Earth, which is enough light to grow crops. However, importing glass, building the greenhouses, and heating them, is difficult and takes a lot of power. Providing radiation protection is difficult, (we could have dirt above, and side light the green house with mirrors). For this page, we are assuming that the food is grown underground using artificial light.

	==Sources==		==Sources==

@@ Line 16: / Line 16: @@
 |'''GJ/y per'''
 '''person'''
-|'''Avg. Power (MW)'''
+|'''Avg. Power'''
+|
 |-

@@ Line 16: / Line 16: @@
 |'''GJ/y per'''
 '''person'''
-|'''Average Power (MW)'''
+|'''Avg. Power (MW)'''
+|
 |-

@@ Line 53: / Line 53: @@
 |34
 |Food for 1000 people, entirely artificial lighting
 |-
 |'''total'''

@@ Line 71: / Line 71: @@
 For a settlement, the solar power would not be available at night, so energy storage would be required to supply the required demand during the night.  If the demand curve followed the one described in the demand section, at least 5%, and perhaps up to 10% of the energy would need to be stored.  If a 1m2 solar array produces 2,4 MJ per day, then for lithium ion batteries storing 1 MJ/kg between 0,12 (5%) and 0,24 (10%) kg of batteries would be required.
-See [[Flow Batteries]] for an inexpensive, long duration battery type.
+See [[Flow battery | Flow Batteries]] for an inexpensive, long duration battery type.
 ===Thermocouples===

← Older revision		Revision as of 23:34, 3 September 2024
Line 70:		Line 70:

	For a settlement, the solar power would not be available at night, so energy storage would be required to supply the required demand during the night. If the demand curve followed the one described in the demand section, at least 5%, and perhaps up to 10% of the energy would need to be stored. If a 1m2 solar array produces 2,4 MJ per day, then for lithium ion batteries storing 1 MJ/kg between 0,12 (5%) and 0,24 (10%) kg of batteries would be required.		For a settlement, the solar power would not be available at night, so energy storage would be required to supply the required demand during the night. If the demand curve followed the one described in the demand section, at least 5%, and perhaps up to 10% of the energy would need to be stored. If a 1m2 solar array produces 2,4 MJ per day, then for lithium ion batteries storing 1 MJ/kg between 0,12 (5%) and 0,24 (10%) kg of batteries would be required.
		+
		+	See [[Flow Batteries]] for an inexpensive, long duration battery type.

	===Thermocouples===		===Thermocouples===

@@ Line 85: / Line 85: @@
 ===Geothermal===
 Depth drilling can possibly be used to heat [[building]]s by [[geothermal energy]] of produce electricity using steam or gas turbines. The temperature in deeper layers of the Martian crust is unclear.  [[Volcano]]<nowiki/>es have erupted on Mars within the last 100 million years, so local areas of hot rocks are likely.
 ==Uses==

@@ Line 82: / Line 82: @@
 ===Nuclear===
-[[Nuclear power]] has been considered as the preferred energy source for most plans for medium- to long-term human expeditions to Mars. It does not depend on weather conditions. The availability of radioactive resources on Mars is unclear.  (See [[Radioactive Rarity on Mars]].)  Due to the vast effort of the nuclear enrichment process, the nuclear fuel must be brought from Earth until an enrichment facility can be built on Mars.  (If [[Thorium]] based [[LFTR]] are built, no fuel enrichment is needed, but mining and concentrating Thorium may be itself an energy intensive process.)
+[[Nuclear power]] has been considered as the preferred energy source for most plans for medium- to long-term human expeditions to Mars. It does not depend on weather conditions, works at night, and generates process heat. The availability of radioactive resources on Mars is unclear.  (See [[Radioactive Rarity on Mars]].)  Due to the vast effort of the nuclear enrichment process, the nuclear fuel must be brought from Earth until an enrichment facility can be built on Mars.  (If [[Thorium]] based [[LFTR]] are built, no fuel enrichment is needed, but mining and concentrating Thorium may be itself an energy intensive process.)
 ===Geothermal===